Xantrex Technology Power Supply RS232 HPD User Manual

RS232-XT  
RS232-HPD  
Operating Manual  
Internal RS-232 Interface  
for XT/HPD Series  
Programmable DC  
Power Supplies  
 
Operating Manual for  
Internal RS-232 Interface  
for XT 60 Watt and  
HPD 300 Watt Series  
Programmable DC  
Power Supplies  
 
Limited What does this warranty cover and how long does it last?  
Warranty  
This Limited Warranty is provided by Xantrex Technology, Inc. (“Xantrex”) and  
covers defects in workmanship and materials in your RS-232 Interface Card. This  
warranty lasts for a Warranty Period of 5 years from the date of purchase at point of  
sale to you, the original end user customer.  
What will Xantrex do?  
Xantrex will, at its option, repair or replace the defective product free of charge,  
provided that you notify Xantrex of the product defect within the Warranty Period,  
and provided that Xantrex through inspection establishes the existence of such a  
defect and that it is covered by this Limited Warranty.  
Xantrex will, at its option, use new and/or reconditioned parts in performing  
warranty repair and building replacement products. Xantrex reserves the right to use  
parts or products of original or improved design in the repair or replacement. If  
Xantrex repairs or replaces a product, its warranty continues for the remaining  
portion of the original Warranty Period or 90 days from the date of the return  
shipment to the customer, whichever is greater. All replaced products and all parts  
removed from repaired products become the property of Xantrex.  
Xantrex covers both parts and labor necessary to repair the product, and return  
shipment to the customer via a Xantrex-selected non-expedited surface freight  
within the contiguous United States and Canada. Alaska and Hawaii are excluded.  
Contact Xantrex Customer Service for details on freight policy for return shipments  
outside of the contiguous United States and Canada.  
How do you get service?  
If your product requires troubleshooting or warranty service, contact your merchant.  
If you are unable to contact your merchant, or the merchant is unable to provide  
service, contact Xantrex directly at:  
Phone:  
604 422 8595  
Toll Free North America:  
1 800 667 8422  
604 421 3056  
Fax:  
Email:  
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Operating Manual for RS-232 for XT/HPD Series Power Supply  
 
Direct returns may be performed according to the Xantrex Return Material  
Authorization Policy described in your product manual. For some products, Xantrex  
maintains a network of regional Authorized Service Centers. Call Xantrex or check  
our website to see if your product can be repaired at one of these facilities.  
In any warranty claim, dated proof of purchase must accompany the product and the  
product must not have been disassembled or modified without prior written  
authorization by Xantrex.  
Proof of purchase may be in any one of the following forms:  
The dated purchase receipt from the original purchase of the product at point of  
sale to the end user, or  
The dated dealer invoice or purchase receipt showing original equipment  
manufacturer (OEM) status, or  
The dated invoice or purchase receipt showing the product exchanged under  
warranty  
What does this warranty not cover?  
This Limited Warranty does not cover normal wear and tear of the product or costs  
related to the removal, installation, or troubleshooting of the customer’s electrical  
systems. This warranty does not apply to and Xantrex will not be responsible for any  
defect in or damage to:  
a. the product if it has been misused, neglected, improperly installed, physically  
damaged or altered, either internally or externally, or damaged from improper  
use or use in an unsuitable environment;  
b. the product if it has been subjected to fire, water, generalized corrosion,  
biological infestations, and high input voltage from lightning strikes;  
c. the product if repairs have been done to it other than by Xantrex or its authorized  
service centers (hereafter “ASCs”);  
d. the product if it is used as a component part of a product expressly warranted by  
another manufacturer;  
e. the product if its original identification (trade-mark, serial number) markings  
have been defaced, altered, or removed.  
Release 1.1  
iii  
 
Disclaimer Product  
THIS LIMITED WARRANTY IS THE SOLE AND EXCLUSIVE WARRANTY PROVIDED  
BY XANTREX IN CONNECTION WITH YOUR XANTREX PRODUCT AND IS, WHERE  
PERMITTED BY LAW, IN LIEU OF ALL OTHER WARRANTIES, CONDITIONS,  
GUARANTEES, REPRESENTATIONS, OBLIGATIONS AND LIABILITIES, EXPRESS  
OR IMPLIED, STATUTORY OR OTHERWISE IN CONNECTION WITH THE PRODUCT,  
HOWEVER ARISING (WHETHER BY CONTRACT, TORT, NEGLIGENCE, PRINCIPLES  
OF MANUFACTURER’S LIABILITY, OPERATION OF LAW, CONDUCT, STATEMENT  
OR OTHERWISE), INCLUDING WITHOUT RESTRICTION ANY IMPLIED WARRANTY  
OR CONDITION OF QUALITY, MERCHANTABILITY OR FITNESS FOR A  
PARTICULAR PURPOSE. ANY IMPLIED WARRANTY OF MERCHANTABILITY OR  
FITNESS FOR A PARTICULAR PURPOSE TO THE EXTENT REQUIRED UNDER  
APPLICABLE LAW TO APPLY TO THE PRODUCT SHALL BE LIMITED IN DURATION  
TO THE PERIOD STIPULATED UNDER THIS LIMITED WARRANTY.  
IN NO EVENT WILL XANTREX BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT,  
INCIDENTAL OR CONSEQUENTIAL DAMAGES, LOSSES, COSTS OR EXPENSES  
HOWEVER ARISING WHETHER IN CONTRACT OR TORT INCLUDING WITHOUT  
RESTRICTION ANY ECONOMIC LOSSES OF ANY KIND, ANY LOSS OR DAMAGE TO  
PROPERTY, ANY PERSONAL INJURY, ANY DAMAGE OR INJURY ARISING FROM OR  
AS A RESULT OF MISUSE OR ABUSE, OR THE INCORRECT INSTALLATION,  
INTEGRATION OR OPERATION OF THE PRODUCT.  
Exclusions If this product is a consumer product, federal law does not allow an exclusion of  
implied warranties. To the extent you are entitled to implied warranties under federal  
law, to the extent permitted by applicable law they are limited to the duration of this  
Limited Warranty. Some states and provinces do not allow limitations or exclusions  
on implied warranties or on the duration of an implied warranty or on the limitation  
or exclusion of incidental or consequential damages, so the above limitation(s) or  
exclusion(s) may not apply to you. This Limited Warranty gives you specific legal  
rights. You may have other rights which may vary from state to state or province to  
province.  
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Operating Manual for RS-232 for XT/HPD Series Power Supply  
 
Information WITHOUT LIMITING THE GENERALITY OF THE FOREGOING, UNLESS  
SPECIFICALLY AGREED TO BY IT IN WRITING, XANTREX  
a. MAKES NO WARRANTY AS TO THE ACCURACY, SUFFICIENCY OR SUITABILITY  
OF ANY TECHNICAL OR OTHER INFORMATION PROVIDED IN MANUALS OR  
OTHER DOCUMENTATION PROVIDED BY IT IN CONNECTION WITH THE  
PRODUCT; AND  
b. ASSUMES NO RESPONSIBILITY OR LIABILITY FOR LOSSES, DAMAGES,  
COSTS OR EXPENSES, WHETHER SPECIAL, DIRECT, INDIRECT,  
CONSEQUENTIAL OR INCIDENTAL, WHICH MIGHT ARISE OUT OF THE USE OF  
SUCH INFORMATION.  
THE USE OF ANY SUCH INFORMATION WILL BE ENTIRELY AT THE USER’S RISK.  
WARNING: Please refer to your product user manual for limitations on uses of the product.  
Specifically, please note that this power supply is not intended for use in connection  
with life support systems and Xantrex makes no warranty or representation in  
connection with any use of the product for such purposes.  
Limitations  
on Use  
Xantrex Technology, Inc.  
8999 Nelson Way  
Burnaby, British Columbia  
Canada V5A 4B5  
Information Please record the following information when you first open your Power Supply  
package:  
About Your  
Power  
Model Number  
Serial Number  
Purchased From  
Purchase Date  
______________________________________________  
______________________________________________  
______________________________________________  
______________________________________________  
Supply  
Release Release 1.1 (2002-06)  
Copyright  
2002 Xantrex Technology Inc. All rights reserved.  
©
Printed in Canada  
Release 1.1  
v
 
Power  
Supply  
Safety  
WARNING—High Energy and High Voltage  
Exercise caution when using and calibrating a power supply. High energy levels  
can be stored at the output voltage terminals on a power supply in normal  
operation. In addition, potentially lethal voltages exist in the power circuit and on  
the output and sense connectors of a power supply with a rated output greater  
than 40 V. Filter capacitors store potentially dangerous energy for some time after  
power is removed.  
CAUTION  
!
Operate the power supply in an environment free of flammable gases or fumes.  
To ensure that the power supply’s safety features are not compromised, use the  
power supply as specified in this manual and do not substitute parts or make any  
unauthorized modifications. Contact the service technician for service and repair  
help. Repairs must be made by experienced service technicians only.  
Warnings, Warnings, cautions, and notes are defined and formatted in this manual as shown  
below.  
Cautions,  
and Notes  
WARNING  
Describes a potential hazard which could result in injury or death, or, a procedure  
which, if not performed correctly, could result in injury or death.  
CAUTION  
!
Describes a procedure which, if not performed correctly, could result in damage  
to data, equipment, or systems.  
Note  
Describes additional operating information which may affect the performance of the  
equipment.  
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Operating Manual for RS-232 for XT/HPD Series Power Supply  
 
About This Manual  
This technical manual is for the RS-232 Interface, a microprocessor-controlled  
option card for all models of XT and HPD Series DC output power supplies. This  
manual provides you with specifications, user options, and configuration  
instructions for the interface, along with a command set which allows you to control  
your power supply from a computer console. Error messages and calibration  
procedures are also included.  
This manual is designed for the user who is familiar with basic electrical theory  
especially as it applies to the operation of power supplies. This implies a recognition  
of Constant Voltage and Constant Current operation modes and the control of input  
and output power, as well as the observance of safe techniques while effecting supply  
or pin connections and any changes in switch settings. The user should also have  
experience with a computer-based communications software package.  
Refer to your power supply manual for installation, configuration, and operating  
procedures for your power supply.  
Main Sections  
Section 1 Features and Specifications Describes the interface and lists its  
features and specifications.  
Section 2 Installation and Configuration Gives basic setup procedures.  
Describes inspection, cleaning, shipping, and storage procedures.  
Section 3 Operation Lists the complete command set, status registers, and error  
codes.  
Section 4 Calibration Provides detailed procedures for voltage and current  
mode calibration as well as over voltage protection (OVP) calibration. Includes  
calibration for programming and readback accuracy.  
Manual Revisions  
The current release of this manual is listed below. Updates may be issued as an  
addendum.  
Release 1.1 (2002-06)  
Release 1.1  
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About This Manual  
viii  
Operating Manual for RS-232 for XT/HPD Series Power Supply  
 
Section 1. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11  
Features and  
Specifications  
Features and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12  
Readback Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12  
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13  
Installation  
and  
Configuration  
LOC Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25  
OVP Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29  
Operation  
Manual Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35  
Command Format and Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36  
Command Strings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38  
Command Terminators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38  
Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38  
Release 1.1  
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Contents  
Section 4. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53  
Calibration  
Voltage Readback Calibration Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55  
Current Mode Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56  
Current Calibration Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56  
Current Program Calibration Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56  
Current Readback Calibration Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57  
Over Voltage Protection (OVP) Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58  
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Operating Manual for RS-232 for XT/HPD Series Power Supply  
 
Section 1. Features and Specifications  
Description  
The RS-232 Interface is a microprocessor-controlled option card for all models of  
the XT and HPD Series of DC output power supply. Installed internally, the RS-232  
interface card gives you remote digital control of simple test systems. It features fast,  
16-bit resolution for programming and readback and uses bit serial protocol for  
sending data between the computer and the interface. The RS-232 interface has an  
extensive command set and uses most of the user-programmable features employed  
by all of our interfaces.  
In addition to the RS-232 port and its interface, this remote control application  
requires a computer-based communications software package such as PROCOMM,  
XTALK, Windows Terminal Program, equivalent communications software, or low  
level or high level language programs. The RS-232 interface is an ideal tool for  
reliable, remote power supply control of both research and development  
applications.  
Figure 1.1 Sample Configuration using RS-232 Interface  
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Features and Specifications  
Features and Functions  
Features and Functions  
Features 16-bit programming and readback of voltage and current  
Programmable over voltage protection with reset  
Easy-to-use, self-documenting command set  
User-programmable isolated fault, polarity, isolation, and auxiliary, user-defined  
output signals.  
LED status signals: error, address, remote/local operation, and over voltage  
protection.  
Foldback in CV or CC mode with reset  
Software calibration  
Programmable Output voltage and current  
Functions  
Soft limits for voltage and current  
Over voltage protection  
Output enable/disable  
Maskable fault interrupt  
Hold and trigger  
Output relay signals  
Readback Actual voltage and current  
Functions  
Voltage and current settings  
Soft voltage and current limits  
Over voltage protection setting  
Present and accumulated power supply status  
Programming error codes  
Fault codes  
Power supply model and software version identification  
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Operating Manual for RS-232 for XT/HPD Series Power Supply  
 
       
Features and Specifications  
Specifications  
Specifications  
The specifications in this section are warranted at 25°C ±5°C unless otherwise  
specified. All specifications are subject to change without notice.  
Table 1.1 Specifications for XT 60 W Series Supply with RS-232 Interface Installed  
Models  
7-6  
15-4  
20-3  
30-2  
60-1  
120-0.5 250-0.25  
Program Resolution  
Voltage  
Current  
1.1mV  
1.0mA  
1.0mV  
2.4mV  
0.6mA  
2.4mV  
3.1mV  
0.5mA  
3.1mV  
4.7mV  
0.3mA  
4.7mV  
9.3mV  
0.2mA  
9.3mV  
17mV  
0.1mA  
17mV  
34mV  
0.08mA  
34mV  
OVP  
Program Accuracy1  
Voltage  
10mV  
±0.1%  
110mA  
20mV  
±0.1%  
70mA  
20mV  
30mV  
200mV 400mV 800mV  
±0.15% ±0.15% ±0.15% ±0.15% ±0.15%  
50mA  
Current  
40mA  
26mA  
13mA  
±0.2%  
7mA  
±0.15% ±0.15% ±0.15% ±0.15% ±0.2%  
70mV  
±0.2%  
2.4V  
OVP  
150mV 200mV 300mV 600mV 1.2V  
Readback Resolution  
Voltage  
Current  
1.1mV  
1.0mA  
2.4mV  
0.6mA  
3.1mV  
0.5mA  
4.7mV  
0.3mA  
9.3mV  
0.2mA  
17mV  
0.1mA  
34mV  
0.08mA  
Readback Accuracy1  
Voltage  
10mV  
±0.15% ±0.1%  
110mA 70mA  
10mV  
10mV  
±0.1%  
50mA  
15mV  
±0.1%  
40mA  
35mV  
70mV  
140mV  
±0.15% ±0.15% ±0.15%  
26mA  
Current  
13mA  
±0.2%  
7mA  
±0.2%  
±0.15% ±0.15% ±0.15% ±0.15% ±0.2%  
1. Apply accuracy specifications according to the following voltage program accuracy example:  
Set a model XT 15-4 power supply to 10 volts.  
The expected result will be within the range of 10 volts ± 20mV ± 0.1% of the set voltage of 10 volts.  
Release 1.1  
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Features and Specifications  
Specifications  
Table 1.2 Specifications for HPD 300 W Series Supply with RS-232 Interface Installed  
Models  
15-20  
30-10  
60-5  
Program Resolution  
Voltage  
Current  
2.4mV  
2.8mA  
2.4mV  
4.7mV  
1.4mA  
4.7mV  
9.3mV  
0.7mA  
9.3mV  
OVP  
Program Accuracy1  
Voltage  
60mV  
70mV  
90mV  
±0.1%  
75mA  
±0.12%  
150mV  
±0.1%  
50mA  
±0.12%  
300mV  
±0.12%  
25mA  
±0.1%  
600mV  
Current  
OVP  
Readback Resolution  
Voltage  
Current  
2.4mV  
2.8mA  
4.7mV  
1.4mA  
9.3mV  
0.7mA  
Readback Accuracy1  
Voltage  
45mV  
±0.3%  
75mA  
±0.12%  
90mV  
±0.3%  
40mA  
±0.12%  
175mV  
±0.3%  
25mA  
±0.1%  
Current  
1. Apply accuracy specifications according to the following voltage program accuracy example:  
Set a model HPD 15-20 power supply to 10 volts.  
The expected result will be within the range of 10 volts ± 20mV ± 0.1% of the set voltage of  
10 volts.  
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Operating Manual for RS-232 for XT/HPD Series Power Supply  
 
Section 2. Installation and Configuration  
Introduction  
To use this product, you must have the following equipment:  
a compatible model of DC output power supply  
serial extender cable (straight through)  
computer with an RS-232 interface (serial port)  
computer-based communications software package  
previously-purchased supply already on site. The RS-232 interface card will be  
calibrated and configured with default settings. You will need to configure the supply  
for your system using the “Basic Setup Procedure” on page 19. Refer also to  
Figure 2.1, on page 16, Figure 2.2, on page 16 and Figure 2.3, on page 17 for  
drawings of the front panel, the interface subplate, and the RS-232 interface printed  
circuit board (PCB).  
Initial Inspection  
CAUTION  
!
If you remove the unit's cover, use proper static control techniques to avoid damage  
to static-sensitive components on the printed circuit board.  
On first receiving your unit, perform a quick physical check.  
Ensure each package contains a power supply with its RS-232 interface board  
installed, and manuals for the power supply and the RS-232 interface. Any  
additional parts shipped with the power supply will be identified in the supply's  
documentation.  
Inspect the unit for any signs of physical damage such as scratches, cracks, or  
broken switches, connectors, or displays.  
Check the printed circuit board and components if you suspect internal damage.  
If the unit is damaged, save all packing materials and notify the carrier immediately.  
For additional information, please see the section titled, “Returning Power Supplies  
to the Manufacturer” in the manual shipped with your complete unit.  
Release 1.1  
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Installation and Configuration  
Initial Inspection  
Remote Mode (REM) LED  
Service Request (SRQ) LED  
GPIB Only  
Over Voltage Protection (OVP) LED  
OVP Potentiometer  
Figure 2.1 Power Supply Front Panel with RS-232 Interface Installed  
Error LED (ERR)  
Address LED (ADR)  
SW1 Switch  
1 Remote/Local Mode Selection  
2,3 Not Used  
4 CTS/XO Flow Control Selection  
5 Flow ON/OFF Selection  
6-8 B1-B3 Baud Rate Selection  
RS-232 Connector  
J7 User Signal Connector  
Figure 2.2 Power Supply Rear Panel with RS-232 Interface Installed  
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Operating Manual for RS-232 for XT/HPD Series Power Supply  
 
   
Installation and Configuration  
Initial Inspection  
Figure 2.3 RS-232 Interface PCB  
See next page for designation descriptions.  
Release 1.1  
17  
 
 
Installation and Configuration  
Initial Inspection  
JUMPER SELECTION  
J95  
Local OVP control selection  
[closed] [default]. See page 29.  
[open] See Table 2.13, on page 29.  
J117  
J217  
User TTL shutdown (S/D)  
selection  
[1-2] User TTL S/D line active low.  
[2-3] [default] User TTL S/D line active high.  
Remote OVP Control Selection  
[closed] [default]. See page 29.  
[open] See Table 2.13, on page 29.  
J7  
J8  
J9  
RS-232 (J5) transmit and  
receive pin selection  
[3-1] Transmit on pin 3 [default]  
[4-6] Receive on pin 2 [default]  
[3-5] Transmit on pin 2  
[4-2] Receive on pin 3  
RS-232 flow control selection of  
RTS/CTS (ready to send/clear  
to send) or DTR/DSR (data  
terminal ready/data set ready)  
[2-4][3-5] [default] RTS input on pin 7 (used with  
CTS output on pin 8)  
[2-4][1-3] DTR input on pin 4 (used with DSR  
output on pin 6)  
RS-232 flow control selection of  
RTS/CTS or DTR/DSR  
[1-3][4-6] [default] CTS output on pin 8 (used  
with RTS input on pin 7)  
[3-5][4-6] DSR output on pin 6 (used with DTR  
input on pin 4)  
Note: All other jumpers are not user-selectable.  
LED INDICATORS  
CR141  
CR14  
CR13  
Red Diagnostic LED  
Red Diagnostic LED  
Green Diagnostic LED  
Bus error or soft restart on Slave circuitry.  
Soft restart on Master circuitry.  
Bus error on Master circuitry.  
EPROMS  
U95  
U18  
Slave EPROM  
Master EPROM  
See revision number stamped on EPROM.  
See revision number stamped on EPROM.  
Figure 2.3, RS-232 Interface PCB continued.  
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Operating Manual for RS-232 for XT/HPD Series Power Supply  
 
 
Installation and Configuration  
Basic Setup Procedure  
Basic Setup Procedure  
This procedure can be used as a quick reference for those familiar with the  
configuration requirements for the RS-232 interface as installed in the DC power  
supply. For those who want more information, each step refers to more detailed  
procedures located in subsequent sections. Execute each step of the procedure in the  
sequence given.  
The RS-232 standard is a commonly-used serial communications protocol that  
defines how to transmit data between a computer and a programmable instrument. It  
uses a point-to-point communication protocol with a transmitter sending data to a  
receiver, one bit at a time, over a single communication line. Serial communication  
is accessible via the serial ports on most computers.  
For proper communication through the RS-232 serial interface, you need to specify  
various parameters so that your data is sent and received by the controller (computer)  
and the device (power supply) in the same manner. To set the RS-232 option for  
operation, follow the setup procedure in Table 2.1.  
Release 1.1  
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Installation and Configuration  
Basic Setup Procedure  
Table 2.1 Setup Procedure  
Step # Description  
Action  
1
Baud Rate  
Selection  
Select transmission speed  
See “Baud Rate Selection” on  
page 21.  
2
Flow Control  
Selection  
Set flow control ON or OFF. If flow  
control is set ON, choose  
“Flow Control Selection” on page  
22.  
software-based XON/XOFF or  
hardware-based CTS/RTS (Clear to  
Send/Ready to Send) or DTR/DSR  
(Data Terminal Ready/Data Set Ready)  
communication control.  
3
Remote/Local  
Operation  
Use the rear panel REM/LOC switch to See “Remote/Local Operation” on  
select remote or local state of the power page 25.  
supply.  
4
5
6
RS-232  
Connection  
Connect the RS-232 cable assembly to See “RS-232 Connection” on  
the supply at connector J4.  
page 27  
User Signal  
Connector  
Configure and use the J7 connector  
signals, if required.  
on page 31.  
Power ON  
Power on the unit. Before proceeding,  
check to ensure that the green REMOTE on page 29 and “User Signals” on  
LED on the front panel is on.  
See “User Options and Settings”  
page 31 for information about  
Local/Remote OVP, TTL Shutdown,  
and auxiliary connector J7 user  
signals.  
7
8
Power Supply  
Settings  
Configure the controller’s operating  
parameters to match the power supply  
settings.  
See “Power Supply Settings” on  
page 28.  
Test  
Test the link by communicating with the Example: VSET2;ISET1  
power supply. This command string sets power  
supply voltage to 2V and its current  
limit to 1A.  
See Section 3.  
20  
Operating Manual for RS-232 for XT/HPD Series Power Supply  
 
 
Installation and Configuration  
Communications  
Communications  
Baud Rate Serial transmission sends and receives data in bit streams at fixed bit rates. Both the  
computer and the interface must have the same bit rate setting for proper  
communication. Use switches B1, B2, and B3 on the rear panel SW1 switch to select  
the power supply's rate of transmission in bits per second. Table 2.2, “Switch S1  
Settings for Baud Rate”summarizes the switch settings with the reference markings  
on the rear panel subplate. Refer to Figure 2.2, on page 16 for the location of the  
SW1 switch on the RS-232 interface subplate.  
Selection  
Table 2.2 Switch S1 Settings for Baud Rate  
Baud Rate  
9600  
B1  
0
B2  
0
B3  
0
4800  
0
0
1
2400  
0
1
0
1200  
0
1
1
600  
1
0
0
300  
1
0
1
150  
1
1
0
75  
1
1
1
0 = OPEN/OFF  
1 = CLOSED/ON  
Note:When resetting switches B3, B2, and B1 during a working session, turn the  
power supply OFF and then ON again to put the new settings into effect.  
Release 1.1  
21  
 
     
Installation and Configuration  
Communications  
Flow Control  
Selection  
Flow control signals regulate data flow for proper communication. Use the  
FLOW switch on the rear panel S1 switch to select flow control or to disable  
flow control. With flow control enabled, you can use either software or hardware  
protocols to control flow rates. Table 2.3 gives the FLOW switch settings with  
regards to the markings on the subplate rear panel. For a diagram of the rear  
panel subplate, see Figure 2.2, on page 16.  
Table 2.3 Flow Control Section  
FLOW Switch Setting  
Condition  
0
1
Disable Flow Control  
Enable Flow Control  
Once you select the flow control option, you have to select either software flow  
control or hardware flow control using the CTS/XO switch (SW1-4) on the rear  
while with hardware flow control you have the choice of RTS/CTS or DTR/DSR  
protocol. Table 2.4 shows the flow control conditions in reference to the  
CTS/XO switch. To change the hardware flow control protocol, refer to Table  
2.3 in this section. Figure 2.2, “Power Supply Rear Panel with RS-232 Interface  
Installed” on page 16 shows the location of the SW1 switch on the power supply  
rear panel.  
Table 2.4 Hardware/Software Flow Control Selection  
XON Switch Setting  
Condition  
0
1
Hardware Flow Control  
Software Flow Control  
Software  
Flow Control  
This software protocol uses special characters that synchronize device  
communications. The device sends the control code XOFF (ASCII value 13 hex)  
when it is not ready to receive data. The device sends the control code XON  
(ASCII value 11) when it is ready to resume receiving data.  
To choose XON/XOFF protocol, select the XON switch position shown in Table  
2.4.  
22  
Operating Manual for RS-232 for XT/HPD Series Power Supply  
 
     
Installation and Configuration  
Communications  
Hardware  
Flow Control  
Hardware flow control protocol requires a dedicated control line on the RS-232  
cable. The dedicated control line is needed so that the device can signal the  
Set the XON switch for hardware control using the information in Table 2.4. With  
hardware flow control selected, RS-232 Interface PCB jumpers J8 and J9 dictate  
the type of flow protocol. Table 2.5, “Jumper/Pin Settings for RTS/CTS Flow  
Control (Default)” and Table 2.6, “Jumper/Pin Settings for DTR/DSR Flow  
Control (Default)” identify jumper connections and input and output pin  
designations for each protocol. See also “Transmit / Receive Pin Selection” on  
page 24 for RS-232 connector pinouts.  
Note:When resetting the flow control switches during a working session, turn the  
power supply OFF and then ON again to put the new settings into effect.  
Table 2.5 Jumper/Pin Settings for RTS/CTS Flow Control (Default)  
Jumper Connections  
J8 to 2-4 and 3-5  
RS-232 Connector Pin  
RTS (Input to RS-232)  
CTS (Output to RS-232)  
7
8
J9 to 1-3 and 4-6  
Table 2.6 Jumper/Pin Settings for DTR/DSR Flow Control (Default)  
Jumper Connections  
J8 to 2-4 and 1-3  
RS-232 Connector Pin  
DTR (Input to RS-232)  
DSR (Output to RS-232)  
4
6
J9 to 3-5 and 4-6  
Release 1.1  
23  
 
   
Installation and Configuration  
Communications  
Connections  
Use a 9-pin (DB9) to 9-pin parallel cable to connect the interface card to the serial  
port on the host computer. If you need to use a 25-pin connector (DB25) on the host  
interface, ensure the correct connections are made by referring Table 2.7. If the  
proper cables are not available and you need to change the transmit/receive pin  
configuration, see “Transmit / Receive Pin Selection”.  
Table 2.7 Transmit/Receive Pin Connections  
Power Supply (DCE)  
Host Computer (DTE)  
9-pin connector  
Pin 2 (Receive)  
Pin 3 (Transmit)  
Pin 5 (Ground)  
Pin 2  
transmits to  
receives from  
connects to  
Pin 3  
Pin 5 (Ground)  
25-pin connector  
Pin 3 (Receive)  
Pin 2 (Transmit)  
Pin 2  
transmits to  
receives from  
connects to  
Pin 3  
Pin 5 (Ground)  
Transmit /  
Receive Pin  
Selection  
The RS-232 interface can use either pin 2 or pin 3 of the RS-232 connector to  
transmit or receive data. You can set the pin orientation you want by changing the  
position of the J7 jumper on the interface PCB. Table 2.8, “Jumper Settings for  
Transmit/Receive Pin Selection” shows the transmit/receive pin selection on the  
RS-232 connector in relation to the settings of the J7 jumper. See Figure 2.3,  
“RS-232 Interface PCB” on page 17 to locate jumper J7.  
Table 2.8 Jumper Settings for Transmit/Receive Pin Selection  
Jumper J7 Connections  
RS-232 Connector Pin  
3
2
Transmit (TXD)  
Receive (RXD)  
4-6 (default)  
4-2  
2
3
3-1 (default)  
3-5  
Removing the  
cover  
In order to access the J7 jumper or the J95 jumper (see page 25) you will need to  
remove the cover. First, turn the unit upside-down and remove the 6 small screws  
(3 to each side) on the bottom of the power supply. Turn the unit back up the right  
way. Hold the plastic front panel firmly and lift the metal cover slightly back and  
up. The front panel should disengage from the cover. Now, holding the cover  
straight, slide it towards the back of the unit, along the runners, until it comes fully  
off.  
24  
Operating Manual for RS-232 for XT/HPD Series Power Supply  
 
       
Installation and Configuration  
Remote/Local Operation  
Remote/Local Operation  
Remote /  
Local Switch  
Use the rear panel Remote/Local switch, SW1-1, to toggle between remote and  
local operation without losing the programmed values. See Table 2.9 for the switch  
settings.  
Table 2.9 Remote/Local Start-up Settings.  
Switch Position  
0, OPEN (REM)  
1, CLOSED (LOC)  
Power ON results  
Unit in remote mode  
Unit in local mode  
LOC  
Command  
Ensure the rear panel REM/LOC switch is set for remote mode. When the switch  
is set for remote mode, you can use the LOC command to toggle between remote  
mode and local mode. See “Command Reference” on page 42.  
Local Mode  
Disable  
Jumper J95  
You can disable local control of the power supply by removing jumper J95 on the  
PCB. We recommend that you remove jumper J95 only if you never plan to control  
the power supply from the front panel. When the Local Mode Disable Jumper J95  
is closed, you can select between operating the power supply in either local mode  
or remote mode by using the rear panel remote/local switch or by using the  
software LOC command. With jumper J95 open, you can only operate the power  
supply in remote mode. Opening the J95 jumper disables the rear panel  
remote/local switch and the front panel voltage and current knobs. You cannot  
return to local mode using the LOC command without closing jumper J95.  
Table 2.10 Local Mode Disable Jumper J95 Selection.  
Jumper J95 Position  
Closed  
Operating State  
Remote or local control of power supply  
Software control only  
Open  
Note:The location of over voltage protection control is dependent on the position  
of jumper J95 and of OVP control jumper J217. Table 2.13, “OVP Control Mode  
Selection,” on page 29 shows how jumper position affects the location of OVP  
control.  
Release 1.1  
25  
 
         
Installation and Configuration  
Remote/Local Operation  
Table 2.11 Remote Mode Power On Conditions  
Condition  
Voltage  
Default Settings  
60 W 7-6 Model Example  
VSET 0  
0 V  
Current  
0 A  
ISET 0  
Soft Voltage Limit  
Soft Current Limit  
OVP Trip Voltage  
Delay  
VMAX (see models)  
VMAX 7  
IMAX (see models)  
IMAX 6  
Model VMAX + 10%  
OVSET 7.7  
DLY 0.5S  
0.5 s  
OFF  
ON  
Foldback Protection  
Output  
FOLD OFF  
OUT ON  
Hold  
OFF  
NONE  
OFF  
OFF  
HOLD OFF  
UNMASK NONE  
AUXA OFF  
AUXB OFF  
Unmask  
AUXA  
AUXB  
Remote Mode  
Operation  
While in remote mode, use the interface commands to control the output of the  
power supply from a computer. See Section 3 for a complete list of  
device-dependent commands available with this interface.  
Local Mode  
Operation  
In local mode operation, you set the voltage and current output levels and the OVP  
trip level with controls located on the front panel. Refer to the operating manual for  
a description of the functions available at the front panel.  
26  
Operating Manual for RS-232 for XT/HPD Series Power Supply  
 
   
Installation and Configuration  
RS-232 Connection  
RS-232 Connection  
WARNING  
Do not operate the power supply and the computer at significantly different frame  
potentials. The interface connection system may not be capable of handling the  
resulting excessive ground currents.  
Use an approved RS-232 connector and cable when connecting the RS-232  
Interface to your computer. The RS-232 connector uses the 9 pin mating connector  
J4 on the rear panel. Figure 2.4 shows the connector pinouts for the RS-232  
connector. Refer to Figure 2.2, on page 16 for the position of the RS-232 connector  
on the rear panel subplate.  
Figure 2.4 RS-232 Connector (J4) Pinouts (default configuration)  
Release 1.1  
27  
 
   
Installation and Configuration  
Power Supply Settings  
Power Supply Settings  
For serial communication, the computer and the RS-232 interface must share the  
same communication settings. Make sure that the settings of the computer and of  
the power supply agree with those shown in Table 2.12.  
Table 2.12 Power Supply Settings  
Parameter  
Transmission  
Mode  
Setting  
Asynchronous  
Full Duplex  
Speeds  
75, 150, 300, 600, 1200, 2400, 4800, 9600  
Parity  
None  
Connector  
Start Bit  
DB9-pin Male  
1
1
8
Stop Bit  
Data Bits  
Protocols  
XON/XOFF (Software flow control)  
CTS/RTS (DSR/DTR) (Hardware flow control)  
NONE (Flow control off)  
28  
Operating Manual for RS-232 for XT/HPD Series Power Supply  
 
   
Installation and Configuration  
User Options and Settings  
User Options and Settings  
CAUTION  
!
If you remove the unit's cover, use proper static control techniques to avoid damage  
to static-sensitive components on the printed circuit board.  
You can customize remote operation settings for OVP (over voltage protection)  
control and TTL shutdown by changing jumper positions on the RS-232 PCB.  
Refer to the operating manual for information on how to use over voltage  
protection and TTL shutdown.  
OVP  
Selection  
Over voltage protection (OVP) on the RS-232 interface is set at the factory for  
remote software operation. When operating the power supply in remote mode, you  
control the OVP trip level using the OVSET software command. If you return the  
power supply to local operation by using the LOC software command, control of  
the OVP trip level changes from software control to the front panel OVP  
potentiometer. The default OVP trip level is set as 110% of the power supply's  
rated output voltage. See Table 2.11, on page 26 for a complete list of remote  
power ON default settings.  
You can isolate the location of OVP control by changing the positions of the Local  
OVP Control jumper J95 and the Remote OVP Control jumper J217, both on the  
RS-232 interface PCB. The default jumper settings allow control of OVP to depend  
on the operating state of the power supply. By physically changing the jumper  
settings, you can isolate the location of OVP control to software control only or  
front panel control only. Table 2.13 shows the jumper settings and OVP  
programming selection. Refer to “Basic Setup Procedure” on page 19 for the  
positions of the jumpers on the RS-232 PCB.  
Table 2.13 OVP Control Mode Selection  
PCB Jumper  
J95 Position  
PCB Jumper  
J217 Position  
OVP Programming Selection  
Closed (default) Closed (default) Software or Front Panel OVP control  
(dependent on the power supply operating state)  
Open  
Closed  
Open  
Closed  
Open  
Open  
Software OVP control only  
Front Panel OVP control only  
Front Panel OVP control only  
Release 1.1  
29  
 
     
Installation and Configuration  
User Options and Settings  
TTL  
You can use the Shutdown function to disable or enable the supply's output.  
Disabling the supply using TTL shutdown allows you to make adjustments to the  
RS-232 interface installed, TTL shutdown is activated by a TTL signal to Pin 1 of  
the J7 connector on the interface subplate. The shutdown user line uses a 0-5Vdc  
TTL input with a high signal range of 2.2-5.0Vdc. The current range of the  
shutdown line is 1-10mA. See Figure 2.6, “J7 User Signal Connector Circuit Block  
Diagram” on page 32 for a schematic of the J7 connector containing the shutdown  
user line.  
Shutdown  
You can select the logic level of the TTL input by changing the J117 connector on  
the RS-232 PCB. Table 2.14 shows the TTL signal levels for the J117 jumper  
settings. See Figure 2.3, on page 17 for the location of the J117 jumper on the  
printed circuit board.  
Table 2.14 Switch Settings for TTL Shutdown Circuit Logic  
PCB Jumper J117  
TTL Signal Level Supply Output Condition  
Position  
Pin 2 to Pin 3 (default)  
HIGH  
LOW  
OFF  
ON  
Pin 1 to Pin 2  
HIGH  
LOW  
ON  
OFF  
30  
Operating Manual for RS-232 for XT/HPD Series Power Supply  
 
   
Installation and Configuration  
User Signals  
User Signals  
Connector J7  
User Signals  
Auxiliary connector J7, located on the RS-232 interface rear panel, provides  
several signals to increase your operating control of the supply. These signals are  
dependent on the operator's design and uses. The operation of the J7 signal requires  
that you provide external Vcc and ground. Use a standard 8-position RJ45  
connector and data cable to connect to J7. To locate the connector, refer to the  
RS-232 interface subplate drawing in Figure 2.2, on page 16. See Figure 2.5 for pin  
descriptions. The J7 outputs can sink a current of 5mA each. Figure 2.6, on page  
32 shows the portion of the option board schematic which contains the J7  
connector. Use the schematic as a reference when making input or output  
connections.  
J7-1 External TTL shutdown input signal  
(See “TTL Shutdown”)  
J7-2 Polarity signal, open collector  
(asserted by VSET -x)  
J7-3 Isolation signal, open collector  
(asserted by OUT OFF)  
J7-4 Fault signal, open collector  
J7  
(asserted when bit set in fault register)  
J7-5 External Vcc, 15V maximum  
(supplied by connecting and operating an external source)  
J7-6 External ground and shutdown return  
(supplied by connecting and operating an external source)  
J7-7 Open collector user signal  
(asserted by AUXA ON)  
J7-8 Open collector user signal  
(asserted by AUXB ON)  
Figure 2.5 User Signals J7 Connector  
Release 1.1  
31  
 
     
Installation and Configuration  
User Signals  
VCCS  
R63  
511  
SHUTDOWN  
EXT_VCC  
5
J7-  
J7-  
1
5
1
U72  
C
A
4N35  
CR62  
E
4
B K  
6
1
6
2
R61/E  
10k  
VCCS  
7
1
A
AUXB  
J7-  
8
C 5  
U75  
4N35  
R96  
1
5
E
K B  
2
4
8
R61/D  
10k  
6
FAULT  
J7-  
4
9
1
8
U74  
R96/E  
J7- 11  
J7- 12  
1
4
R61/C  
10k  
10  
2
3
7
6
MCT6  
AUXA  
J7-  
7
5
6
1
3
R96/C  
4
1
5
R61/B  
10k  
8
7
POLARITY  
J7-  
2
1
1
2
3
R96/A  
R96/B  
R61/A  
10k  
MCT6  
2
6
5
2
3
4
ISOLATION  
EXT_GND  
J7-  
J7-  
3
6
4
U73  
Figure 2.6 J7 User Signal Connector Circuit Block Diagram  
J7 Cable  
Connection  
Use a standard 8-position RJ45 connector and data cable to connect to J7. Add a  
ferrite block to reduce radiated emission. The one inch square ferrite block with  
built-in housing clip is packaged and shipped with the power supply interface card.  
To install the ferrite block:  
1. Position the block no more than 5 cm (2 in.) from the power supply end of the  
J7 user cable.  
2. Open the ferrite block housing.  
3. Loop the cable through the ferrite block. See Figure 2.7, “J7 User Cable with  
Ferrite Block” on page 33.  
4. Close the housing clip.  
The ferrite block ensures that the power supply system meets radiated emission  
requirement 89/336/EEC for CE mark approval. See the power supply's operating  
manual for noise specifications.  
32  
Operating Manual for RS-232 for XT/HPD Series Power Supply  
 
   
Installation and Configuration  
User Signals  
J7 User Cable  
Ferrite Block  
To J7 Connector  
To User Custom Interface  
Figure 2.7 J7 User Cable with Ferrite Block  
Release 1.1  
33  
 
 
Installation and Configuration  
User Signals  
34  
Operating Manual for RS-232 for XT/HPD Series Power Supply  
 
Section 3. Operation  
Introduction  
This section covers RS-232 interface programming, including an extensive set of  
commands, and providing error codes, and status and fault register information.  
RS-232 Operation  
The RS-232 interface card allows you to send and receive data between your power  
supply and computer. You can use the computer controller to issue commands to the  
power supply for programming, queries, calibration, or status. The power supply  
responds to the complete command set of device dependent software commands  
shown in “Command Reference” on page 42.  
Command Syntax  
Manual The manual uses these conventions when displaying command information. These  
characters are not part of the command but are used to denote parameters used with  
the command.  
Conventions  
< > (angle brackets)  
Angle brackets enclose a parameter. Do not include  
the angle brackets in the command line you send to  
the computer.  
/ (slash)  
Separates two alternative parameters. When a slash  
separates two parameters, you can use either  
parameter to achieve the same result.  
Example: <1/ON>  
Entering 1 or ON will achieve the same result.  
COMPUTER ENTRY  
Words typed on the computer are shown in Arial  
text, full capitals.  
Release 1.1  
35  
 
           
Operation  
Command Syntax  
Command The device-dependent language for the RS-232 Interface consists of commands and  
parameters. A command is a one word code which either gives instructions to the  
interface or asks for information from the interface. A command may be followed by  
one or more parameters, a short code that changes the state of the power supply or  
the state of the bit register. Table 3.1, “Command Parameters” lists the parameters  
that affect the command set.  
Format and  
Parameters  
Format:  
COMMAND or  
COMMAND <parameter> or  
COMMAND <parameter>,<parameter>  
You can enter commands in upper or lower case lettering.  
Example: MASK FOLD = mask fold  
Do not further abbreviate command names or parameters.  
Example:  
MASK FOLD MK FOLD  
MASK FOLD MASK FD  
Use a space between the command and the first parameter. Any number of  
consecutive spaces is treated as one space. Numeric data may contain leading  
spaces. Embedded spaces between digits or between a digit and a decimal point  
are not accepted.  
Example:  
MASK FOLD = MASK  
VOUT 3.4 = VOUT  
FOLD  
3.4  
4
VOUT 3.4 VOUT 3.  
Use commas between parameters in those commands with more than one  
parameter, and between mnemonic parameters as in the MASK and UNMASK  
commands. Only one comma is allowed and it may be preceded or followed by  
any number of spaces.  
Example:  
MASK CV, OV, FOLD  
36  
Operating Manual for RS-232 for XT/HPD Series Power Supply  
 
 
Operation  
Command Syntax  
Table 3.1 Command Parameters  
Parameter  
Description  
Form  
<current>  
The current in amps or milliamps. If no unit is <float>  
given, the default unit is amps.  
<float>A  
<float>mA  
<seconds>  
<voltage>  
The time in seconds or milliseconds. If no unit <float>  
is given, the default unit is seconds.  
<float>s  
<float>ms  
The voltage in volts or millivolts. If no unit is  
given, the default unit is volts.  
<float>  
<float>V  
<float>mV  
<fault mask>  
A combination of CV, CC, OV, SD and FOLD. See registers  
See MASK and UNMASK commands in the  
command reference for use of the ALL and  
NONE parameters.  
on page 49.  
<status mask>  
<other>  
A combination of CV, CC, OV, SD, FOLD,  
ERR and REM. See MASK and UNMASK  
commands in the command reference for use  
of the ALL and NONE parameters.  
See registers  
on page 49.  
Command-specific parameters such as 1, 0,  
ON, OFF, ALL or NONE.  
See page 42.  
Floating Point Number <float> Variables sent with command parameters are  
floating point numbers. Table 3.2 defines the structure of floating point numbers for  
use with the software commands.  
Table 3.2 Floating Point Numbers  
Floating Number Definition  
Example  
The floating point number has four significant figures.  
It can be of either sign, positive or negative.  
1.234  
-1.234  
+1.234  
A floating point number can have a decimal point.  
0.123  
1.2  
123.4  
Scientific Notation  
123.0E-1  
Use E or e after the number for a base ten exponent. 1.2E-1  
An integer of either sign must follow an exponent.  
10.00E+1  
Release 1.1  
37  
 
 
Operation  
Command Syntax  
Command If you send more than one command line, separate the commands with a semicolon.  
The semicolon may be preceded or followed by spaces.  
Strings  
Example:  
ISET 2.0A; VSET 5V  
ISET 2.0A; VSET 5V  
Command Terminators indicate the end of a command string and tell the power supply to  
execute the command. The termination character is CR (carriage return).  
Terminators  
Format:  
COMMAND <parameter>; COMMAND <parameter>, <parameter><CR>  
Most computer controllers automatically send LF with output statements.  
Order You may send commands in any order, keeping in mind that only those commands  
received after a HOLD and before a TRG (trigger) will be released by the TRG  
command. In addition, only these commands received after a supply disable and  
before a RST (reset) or OUT ON command will be released by the RST command  
or the OUT command. Commands are executed in the order they are received.  
38  
Operating Manual for RS-232 for XT/HPD Series Power Supply  
 
     
Operation  
Command Summary  
Command Summary  
Use these commands to control the operation of the supply. They are listed here in  
order of function such as PROGRAMMING, QUERY, CALIBRATION, and  
STATUS commands. See “Command Reference” on page 42 for more detailed  
information about each command and its use.  
Table 3.3 Programming Commands  
Command Description  
AUXA  
AUXB  
CLR  
Selects the state of the AUXA output signal on the J7-7 connector.  
Selects the state of the AUXB output signal on the J7-8 connector.  
Initializes the power supply to its Power ON (PON) state.  
DLY  
Sets a programmable time delay which is executed by the supply  
before reporting fault conditions after a new output voltage or current is  
specified.  
FOLD  
HOLD  
IMAX  
Sets foldback mode for the supply.  
Enables or disables voltage/current setting hold mode for the supply.  
Sets an upper soft limit on the programmed output current for the  
supply.  
ISET  
Sets the output current of the supply in amps (default) or in milliamps.  
Enables or disables local mode operation for the power supply.  
Enables or disables voltage/current output for the supply.  
LOC  
OUT  
OVSET  
Sets the over voltage protection trip point for the supply in volts  
(default) or in millivolts.  
RST  
TRG  
Resets the supply to the present voltage and current settings if the  
output is disabled by OVP or foldback protection.  
Implements programmed voltage and current settings which had been  
in hold mode.  
VMAX  
VSET  
Sets an upper soft limit on the supply’s programmed output voltage.  
Sets the output voltage of the power supply in volts (default) or in  
millivolts.  
Release 1.1  
39  
 
 
Operation  
Command Summary  
Table 3.4 Query Commands  
Command Description  
AUXA?  
AUXB?  
CMODE?  
DLY?  
Asks for the state of the set value for the AUXA command  
Asks for the state of the set value for the AUXB command  
Asks for the power supply’s calibration mode status.  
Asks for the programmable time delay setting before the supply  
reports fault conditions.  
ERR?  
Asks for the most recent remote programming error which occurred in  
the supply since the last time the error query command (ERR?) was  
used.  
FOLD?  
HOLD?  
ID?  
Asks for the supply’s present foldback setting.  
Asks for the present hold mode setting.  
Asks for the power supply’s model name and master EPROM version.  
Asks for the supply’s soft current limit setting.  
IMAX?  
IOUT?  
ISET?  
LOC?  
Measures the supply’s actual current output.  
Asks for the supply’s present output current limit setting.  
Asks whether or not the supply is in local mode operation.  
Asks for the present enabled/disabled status of the supply’s output.  
Asks for the supply’s present over voltage protection limit.  
OUT?  
OVSET?  
ROM?  
Asks for the version number of the master and slave EPROMs on the  
interface PCB.  
VMAX?  
VOUT?  
VSET?  
Asks for the supply’s soft voltage limit setting.  
Measures the supply’s actual voltage output.  
Asks for the supply’s present output voltage setting.  
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Operating Manual for RS-232 for XT/HPD Series Power Supply  
 
Operation  
Command Summary  
Table 3.5 Calibration Commands  
Command Description  
CMODE  
IDATA  
IHI  
Places the supply into calibration mode.  
Calculates the slope and intercept for current programming.  
Sets the current output to the high calibration point.  
Sets the current output to the low calibration point.  
Calculates the slope and intercept for current readback.  
Sets the current output to the high readback point.  
Sets the current output to the low readback point.  
Calibrates the over voltage protection (OVP).  
ILO  
IRDAT  
IRHI  
IRLO  
OVCAL  
VDATA  
VHI  
Calculates the slope and intercept for voltage programming.  
Sets the voltage output to the high calibration point.  
Sets the voltage output to the low calibration point.  
Calculates the slope and intercept for voltage readback.  
Sets the voltage output to the high readback point.  
Sets the voltage output to the low readback point.  
VLO  
VRDAT  
VRHI  
VRLO  
Table 3.6 Status Commands  
Command Description  
ASTS?  
Asks for the supply’s accumulated status register.  
FAULT?  
Asks for the supply’s fault register for the status preset operating  
conditions.  
MASK  
Prevents the supply's previously unmasked operating conditions from  
setting bits in the fault register.  
STS?  
Asks for the supply’s present status register.  
UNMASK  
Enables you to select those supply's operating conditions that you are  
most interested in monitoring for fault occurrence.  
UNMASK? Asks for the supply's fault conditions which are currently enabled  
(unmasked).  
Release 1.1  
41  
 
 
Operation  
Command Reference  
Command Reference  
Table 3.7 Command Reference  
Command  
Description  
ASTS?  
Returns the supply’s accumulated status register. The accumulated status  
register stores any bit that was entered in the status register since the  
whether the condition still exists. Bits in the accumulated status register  
represent the same bits and conditions as the bits in the status register. A  
bit in the accumulated status register will be set at 1 if the corresponding bit  
in the status register has been 1 (TRUE) at any time since the register was  
last read. See “Accumulated Status, Status, and Fault Registers” on page  
49. The ASTS? query clears the accumulated status register.  
Response: ASTS <status mask> where status mask is the decimal  
equivalent of the total bit weights for the operating conditions as listed in the  
status register.  
AUXA <1/ON>,<0/OFF>  
AUXA?  
Sets the AUXA output signal level at rear panel connector J7-7. Active low.  
Initial value: AUXA 0  
Returns the present set value of the AUXA output signal.  
Response: AUXA 0 (OFF)  
AUXA 1 (ON)  
AUXB <1/ON>,<0/OFF>  
Controls the AUXB output signal level at rear panel connector J7-8. Active  
low.  
Initial value: AUXB 0  
AUXB?  
CLR  
Returns the present set value of the AUXB output signal.  
Response: AUXB 0 (OFF)  
AUXB 1 (ON)  
Initializes the power supply to its power ON condition. If issued while in local  
mode, CLR will force power supply settings to register default values as in  
but these default settings will not come into effect until the power supply is  
switched to remote mode operation. The CLR commands will clear faults  
from the fault register. CLR will not reset CMODE.  
CMODE <1/ON>,<0/OFF> CMODE ON places the power supply into calibration mode for processing  
calibration commands.  
Initial value: CMODE OFF or CMODE 0  
CMODE?  
Returns the power supply’s calibration mode status.  
Response: CMODE 0 (disabled)  
CMODE 1 (enabled)  
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Operating Manual for RS-232 for XT/HPD Series Power Supply  
 
   
Operation  
Command Reference  
Command  
Description  
DLY <seconds>  
Sets a programmable time delay employed by the supply before reporting  
fault conditions. The power supply uses the time delay after receiving a new  
output voltage or current setting via VSET or ISET, or after receiving RST,  
TRG, or OUT ON commands. During the time delay, the power supply  
disables CV, CC, and FOLD conditions from generating faults, preventing  
possible nuisance foldback if the supply momentarily switches modes while  
changing an output setting.  
Range: 0 to 32 seconds, with 32ms resolution  
Initial value: 0.5 second  
DLY?  
ERR?  
Returns the setting of the programmable time delay before the supply  
reports fault conditions.  
Response: DLY <seconds>  
Returns the most recent remote programming error. When the power supply  
the accumulated status and fault registers. If the error bit has been masked  
using the MASK command, then the ERR bit in the registers will not set.  
Once an error is detected, the remaining portion of the command line is  
discarded. An error query clears the ERR bit in the accumulated status  
register. See “Error Codes” on page 51.  
Response: ERR <error number> Example: ERR 0 (if no error)  
FAULT?  
Returns the state of the fault register. A bit is set in the fault register when a  
fault arises for that condition. Lists the conditions which activate a fault bit.  
You can use the MASK command to disable bits from being set in the fault  
register.  
When a bit is set in the fault register it also asserts a signal on the J7-4 user  
signal line. You can tie the J7-4 fault line signal to the power supply's own  
(active) in the case of a user-defined fault.  
The FAULT? query clears bits in the supply's fault register and fault line.  
Response: FAULT <fault mask> where fault mask is the decimal equivalent  
of the total bit weights for the operating conditions as listed in the fault  
register. See “Accumulated Status, Status, and Fault Registers” on page  
49.  
FOLD  
<2/CC>, <1/CV>,  
<0/OFF>  
Sets foldback mode for the supply. Foldback protection disables the power  
supply output when the output enters the fold condition. Reset with the RST  
command.  
Example: Specify FOLD 1 or FOLD CV (Constant Voltage) when you want  
the supply to operate in Constant Current mode and have foldback  
protection disable the output if the supply switches to Constant Voltage  
mode.  
Initial value: FOLD 0/OFF  
Release 1.1  
43  
 
Operation  
Command Reference  
Command  
Description  
FOLD?  
Returns the supply’s present foldback setting.  
Response: FOLD <mode> where mode is:  
0 (OFF) or  
1 (CV or Constant Voltage mode) or  
2 (CC or Constant Current mode)  
HOLD <1/ON>,<0/OFF>  
Enables or disables voltage/current setting hold mode for the supply. When  
HOLD ON is specified, hold mode is enabled so that all voltage and current  
settings which would normally be applied immediately are held until a TRG  
(trigger) command is received. This feature allows you to synchronize the  
operation of several supplies.  
Initial value: HOLD OFF or HOLD 0  
HOLD?  
Returns the present hold mode setting.  
Response: HOLD 0 (OFF or disabled) or  
HOLD 1 (ON or enabled)  
ID?  
Returns the power supply model and the master EPROM version.  
Response: ID <model name><version>  
IDATA <Ilo>,<Ihi>  
Calculates and records the slope and offset for programmed current using  
ILO and IHI data. Set CMODE ON before using this command. See also the  
calibration procedures in Section 4.  
<Ilo> and <Ihi> are in <current> format.  
IHI  
In response to this command, the power supply sends a programmed  
current value to the output terminal. This value is at the high end of the  
power supply’s current range and is read by an external device connected  
as part of the calibration procedure. Refer to this value as IHI and record it  
to use as input with the IDATA command. Set CMODE ON before using this  
command. See also the calibration procedures in Section 4.  
ILO  
In response to this command, the power supply sends a programmed  
current value to the output terminal. This value is at the low end of the  
power supply’s current range and is read by an external device connected  
as part of the calibration procedure. Refer to this value as ILO and record it  
to use as input with the IDATA command. Set CMODE ON before using this  
command. See also the calibration procedures in Section 4 .  
IMAX <current>  
Sets an upper soft limit on the supply’s programmed output current. If the  
soft limit is exceeded, or if the soft limit value is lower than the present  
output current setting, the supply will ignore the command, turn on the  
ERR LED, and set the ERR bit in the bit registers.  
Range: 0 to model maximum output current (IMAX)  
Initial value: model IMAX  
IMAX?  
Returns the supply’s soft current limit setting.  
Response: IMAX <current>  
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Operating Manual for RS-232 for XT/HPD Series Power Supply  
 
Operation  
Command Reference  
Command  
Description  
IOUT?  
Measures and returns the supply’s actual current output using the built-in  
current readback circuitry.  
Response: IOUT <current>  
IRDAT <Ilo>,<Ihi>  
IRHI  
Calculates and records the slope and offset for readback voltage using  
IRLO and IRHI data. Set CMODE ON before using this command. See also  
the calibration procedures in Section 4.  
<Ilo> and <Ihi> are in <current> format.  
as part of the calibration procedure and records a current readback value  
internally. These values are at the high end of the programmed current  
range. Refer to the output value as IRHI and record it to use as input with  
the IRDAT command. Set CMODE ON before using this command. See  
also the calibration procedures in Section 4.  
IRLO  
as part of the calibration procedure and records a current readback value  
internally. These values are at the low end of the programmed current  
range. Refer to the output value as IRLO and record it to use as input with  
the IRDAT command. Set CMODE ON before using this command. See  
also the calibration procedures in Section 4.  
ISET <current>  
Sets the power supply’s output current in amps (default) or in milliamps.  
This programmed current is the actual output in CC mode or the current  
limit in CV mode.  
Range: 0 to model maximum output current (IMAX)  
Initial value: 0 amps  
ISET?  
Returns the supply’s present output current setting. Does not apply to  
current settings which are being held. See HOLD command.  
Response: ISET <current>  
LOC <1/ON>,<0/OFF>  
LOC?  
Enables or disables local mode operation for the power supply. This  
command is used with the rear panel Remote switch. See “LOC  
Command” on page 25.  
Returns the present enabled/disabled setting of local mode operation.  
Response: LOC 0 (OFF or disabled) or  
LOC 1 (ON or enabled)  
MASK <mnemonics>  
Disables the supply's previously unmasked operating conditions from  
setting bits in the fault and status registers. See “Accumulated Status,  
Status, and Fault Registers” on page 49. Mnemonics are separated from  
each other by commas and may be sent in any order.  
Mnemonics: CV, CC, OV, SD, FOLD, ERR  
Note: UNMASK NONE = MASK ALL (Initial value)  
MASK NONE = UNMASK ALL  
Release 1.1  
45  
 
Operation  
Command Reference  
Command  
Description  
OUT <1/ON>,<0/OFF>  
Enables or disables the supply’s voltage/current output. The supply will  
continue to accept new commands while the output is disabled but these  
will not be implemented until OUT ON or OUT 1 is received. OUT ON is the  
default setting. When you start the supply in remote mode, the output is  
enabled.  
OUT OFF (or OUT 0) also sets the isolation signal on the rear panel J7  
connector, line 3. You can use the to trip external relays to isolate the power  
supply from the load.  
Initial value: OUT ON (or OUT 1) for output enabled  
OUT?  
Returns the present enabled/disabled status of the supply’s output  
voltage/current.  
Response: OUT 1 output enabled or  
OUT 0 output disabled  
OVCAL  
Causes the master controller to perform automatic calibration of the  
supply’s over voltage protection circuitry. Set CMODE ON before using this  
command. Ensure jumper J95 on the RS-232 Interface PCB is connected  
for remote operation.  
OVSET <voltage>  
Sets the supply’s over voltage protection trip point in volts (default) or in  
millivolts. If the trip point is exceeded, or if the trip point value is lower than  
the present output voltage setting, the supply will ignore the command, turn  
on the ERR LED, and set the ERR bit in the accumulated status register.  
Reset with the RST command.  
Range: 0 to 110% of model maximum output voltage (VMAX)  
Initial value: 110% of model VMAX  
OVSET?  
ROM?  
Returns the supply’s present over voltage protection limit.  
Response: OVSET <voltage>  
Returns the version number of the master and slave EPROMs located on  
the interface PCB.  
Response: ROM M:<version> S:<version>  
RST  
Resets the supply to present voltage and current settings if the output is  
disabled by over voltage or foldback protection. Output values may be  
changed via VSET, ISET, and OVSET while the unit is disabled, but those  
values will not take effect until RST is applied.  
STS?  
Returns the supply’s present status register. Status conditions are stored in  
the status register. Each bit represents a separate condition. When the  
condition is true, the corresponding bit is 1 (true). Bits remain set in the  
status register as long as the condition is true. See “Accumulated Status,  
Status, and Fault Registers” on page 49.  
Response: STS <status mask> where status mask is the decimal equivalent  
of the total bit weights for the operating conditions as listed in the status  
register.  
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Operating Manual for RS-232 for XT/HPD Series Power Supply  
 
Operation  
Command Reference  
Command  
Description  
TRG  
Causes programmed voltage and current settings which had been in hold  
mode to be applied. The supply operates with previous values until the TRG  
(trigger) command is sent.  
UNMASK <mnemonics>  
Selects the supply operating conditions that you are most interested in  
monitoring for fault occurrence. Mnemonics describing the conditions are  
separated from each other by commas, and may be sent in any order.  
decimal equivalent of their total bit weight) enables the selected conditions  
to set bits in the supply’s fault and status registers during operation. A bit is  
set in the fault register when the corresponding bit in the status register  
changes from 0 to 1 and the corresponding bit in the mask register is 1. See  
“Accumulated Status, Status, and Fault Registers” on page 49.  
Mnemonics: CV, CC, OV, SD, FOLD, ERR, ALL, NONE  
Initial value: UNMASK NONE  
UNMASK?  
(unmasked).  
Response: UNMASK <fault mask> where fault mask is the decimal  
equivalent of the total bit weights for the operating conditions as listed in the  
status and fault registers See “Accumulated Status, Status, and Fault  
Registers” on page 49.  
VDATA <Vlo>,<Vhi>  
VHI  
Calculates and records the slope and offset for programmed voltage using  
VLO and VHI data. Set CMODE ON before using this command. See also  
the calibration procedures in Section 4.  
<Vlo> and <Vhi> are in <voltage> format.  
In response to this command, the power supply sends a programmed  
voltage value to the output terminal. This value is at the high end of the  
power supply’s voltage range and is read by an external device connected  
as part of the calibration procedure. Refer to this value as VHI and record it  
to use as input with the VDATA command. Set CMODE ON before using  
this command. See also the calibration procedures in Section 4.  
VLO  
In response to this command, the power supply sends a programmed  
voltage value to the output terminal. This value is at the low end of the  
power supply’s voltage range and is read by an external voltmeter  
connected as part of the calibration procedure. Refer to this value as VLO  
and record it to use as input with the VDATA command. Set CMODE ON  
before using this command. See also the calibration procedures in  
Section 4.  
Release 1.1  
47  
 
Operation  
Command Reference  
Command  
Description  
VMAX <voltage>  
Sets an upper soft limit on the supply’s programmed output voltage. If the  
soft limit is exceeded, or if the soft limit value is lower than the present  
output voltage setting, the supply will ignore the command, turn on the  
ERR LED, and set the ERR bit in the accumulated status register.  
Range: 0 to model maximum output voltage (VMAX)  
Initial value: model VMAX  
VMAX?  
VOUT?  
Returns the supply’s soft voltage limit setting.  
Response: VMAX <voltage>  
Measures and returns the supply’s actual voltage output using the built-in  
voltage readback circuitry.  
Response: VOUT <voltage>  
VRDAT <Vlo>,<Vhi>  
VRHI  
Calculates and records the slope and offset for readback voltage using  
VRLO and VRHI data. Set CMODE ON before using this command. See  
also the calibration procedures in Section 4 .  
<Vlo> and <Vhi> are in <voltage> format.  
The power supply outputs a voltage value to an external voltmeter  
connected as part of the calibration procedure and records a voltage  
readback value internally. These values are at the high end of the  
programmed voltage range. Refer to the output value as VRHI and record it  
to use as input with the VRDAT command. Set CMODE ON before using  
this command. See also the calibration procedures in Section 4.  
VRLO  
The power supply outputs a voltage value to an external voltmeter  
connected as part of the calibration procedure and records a voltage  
readback value internally. These values are at the low end of the  
programmed voltage range. Refer to the output value as VRLO and record it  
to use as input with the VRDAT command. Set CMODE ON before using  
this command. See also the calibration procedures in Section 4.  
VSET <voltage>  
or  
VSET <-voltage>  
Sets the power supply’s output voltage in volts (default) or in millivolts. This  
programmed voltage is the actual output in CV (constant voltage) mode or  
the voltage limit in CC (constant current) mode.  
If you enter a negative voltage value, the power supply will assert a signal  
on the J7-4 user signal line. You can use the user signal to trip external  
relays to switch the output polarity.  
Range: 0 to model maximum output voltage (VMAX)  
Initial value: 0 volts  
VSET?  
Returns the power supply’s present output voltage setting. Does not apply  
to voltage settings which are being held. See HOLD command.  
Response: VSET <voltage>  
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Operating Manual for RS-232 for XT/HPD Series Power Supply  
 
Operation  
Accumulated Status, Status, and Fault Registers  
Accumulated Status, Status, and Fault Registers  
The RS-232 option card uses three separate registers which are always active. They  
are the accumulated status, status, and fault registers. You can use the status  
commands shown in Table 3.6, “Status Commands” to activate the registers. The  
bit register has eight conditions, each assigned a bit weight. When querying a  
register, the controller returns a response which is the sum of the weights of all  
relevant conditions.  
Example:  
ASTS?  
Query the Accumulated Status register.  
Controller response.  
ASTS 771  
The accumulated status register shows that PON, REM, CC and CV have all been  
active since the last accumulated status register query.  
Table 3.8 shows the mnemonics and bit weights which correspond to each register  
condition. You can select conditions you want to monitor in the fault and status  
register by using the MASK and UNMASK commands.  
Release 1.1  
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Operation  
Accumulated Status, Status, and Fault Registers  
Table 3.8 Accumulated Status, Status, and Fault Registers  
Condition  
Mnemonic Bit Position Bit Weight  
Constant voltage operation  
Constant current operation  
Not used  
CV  
CC  
0
1
2
3
4
5
6
7
8
1
2
4
Overvoltage protection tripped  
Not used  
OV  
8
16  
32  
64  
128  
256  
Supply external shutdown active (J7-1)  
Foldback mode operation  
Remote programming error  
SD  
FOLD  
ERR  
PON  
Power ON (accumulated status, status  
registers only)  
Remote mode (accumulated status, status REM  
registers only)  
9
512  
Notes:  
1. Only CC, CV, OV, SD, ERR and FOLD can be masked or unmasked.  
2. The error (ERR) bit is reset in the accumulated status, status, and serial poll registers with an  
error query (ERR?).  
3. The accumulated status register is cleared with an accumulated status query (ASTS?).  
4. A fault is cleared with a fault query (FAULT?).  
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Operating Manual for RS-232 for XT/HPD Series Power Supply  
 
 
Operation  
Error Codes  
Error Codes  
If the ERR flag in the accumulated status or fault registers has been activated, an  
ERR? query will return an error number which corresponds to an event described  
in the following table. The ERR? query will also clear the ERR bit in the register.  
Table 3.9 Error Codes  
ERROR # ERROR IDENTIFICATION  
EXPLANATION  
0
4
No Errors  
Unrecognized Character  
Improper Number  
Received a character such as @,*,$.  
Received a numeric character but the  
characters were not a proper number.  
Example: VSET,±10.3  
Unrecognized String  
Syntax Error  
Received an invalid command.  
Received an incorrectly placed word,  
number, separator, or terminator.  
Example: OFF SRQ, VOUT 6, MASK,  
ERR  
5
6
Number Out of Range  
Specified a value for the command  
which was outside of the allowed range.  
Attempt to Exceed Soft Limits Attempted to program a voltage or  
current greater than the soft limit.  
Example: VMAX 500; VSET 550 LF  
7
Improper Soft Limit  
Attempted to program a soft limit less  
than the output value.  
9
OVP Set Below Output  
Sent an OVSET command with a trip  
value lower than the output voltage.  
10  
12  
Slave Processor Not  
Responding  
The interface PCB slave processor did  
not respond.  
Illegal Calibration  
Attempted calibration when the supply  
was not in calibration mode. See  
CMODE command.  
Release 1.1  
51  
 
 
Operation  
Troubleshooting  
Troubleshooting  
WARNING  
Exercise caution when using and servicing power supplies. High energy levels can  
be stored at the output voltage terminals on all power supplies in normal operation.  
In addition, potentially lethal voltages exist in the power circuit and the output  
connector of power supplies which are rated at 40V and over. Filter capacitors store  
potentially dangerous energy for some time after power is removed.  
Diagnostic  
LEDs  
Computer Operating Properly (COP) LEDs The RS-232 interface provides  
three diagnostic LEDs, located at CR13, CR14, and CR141 on its PCB. Refer to  
Figure , ‘Figure 2.3, RS-232 Interface PCB continued.” on page 18, for their  
locations. At present, these LEDs turn on to signal COP events for the interface's  
microprocessors. Issue a RST (reset) command to turn off the diagnostic LEDs.  
The green COP LED at circuit designation CR13 indicates that the RS-232  
interface microprocessor successfully recovered from a timeout error due to a  
communications bus error. The event is transparent to the RS-232 communications  
line continues to function normally.  
The red COP LED at CR14 indicates that a transparent restart caused by noise in  
the master processor circuitry has occurred.  
The red COP LED at CR141 indicates that a transparent restart caused by noise in  
the slave processor circuitry has occurred.  
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Operating Manual for RS-232 for XT/HPD Series Power Supply  
 
   
Section 4. Calibration  
Introduction  
WARNING  
Exercise caution when using and servicing power supplies. High energy levels can  
be stored at the output voltage terminals on all power supplies in normal operation. In  
addition, potentially lethal voltages exist in the power circuit and the output connector  
of power supplies which are rated at 40V and over. Filter capacitors store potentially  
dangerous energy for some time after power is removed.  
You can calibrate the RS-232 interface by adjusting the signal levels on the interface  
card so that they correspond to the expected signal levels on the power supply's main  
assembly. You may need to recalibrate the interface if you replace parts either on the  
interface board or on the main power supply board, or if the unit falls out of  
specification due to component aging drifts.  
You can calibrate the RS-232 Interface for:  
Voltage program  
Voltage readback  
Current program  
Current readback  
Overvoltage protection  
The following equipment will be required to accurately calibrate your unit:  
Digital Voltmeter, 5 1/2 digit, 0.1% accuracy or better, with test leads  
Current sensing shunt resistor, rated for 150% of maximum output current,  
0.25% accuracy or better  
Connection wires rated for the unit's maximum output current and voltage  
An RS-232 equipped computer to send the calibration commands to the unit  
Calibrate the unit according to the following procedures, referring to “Command  
Reference” for more information about the calibration commands used.  
The calibration procedures in this section are designed to be performed at an ambient  
temperature of 25°C ± 5°C.  
Release 1.1  
53  
 
     
Calibration  
Voltage Mode Calibration  
Voltage Mode Calibration  
Voltage 1. Disconnect the load from the power supply which is to be calibrated.  
Calibration  
2. Connect a voltmeter across the power supply’s output terminals.  
Setup  
Figure 4.1 Voltage Calibration Setup  
Voltage 1. Set the power supply for calibration as in Figure 4.1.  
Program  
Calibration  
Procedure  
2. Activate calibration mode by sending command CMODE ON or CMODE 1 to  
the power supply.  
3. Send command VLO; ILO to the power supply. Measure and record the output  
shown on the external voltmeter.  
4. Send command VHI; IHI to the supply. Measure and record the output voltage  
as shown on the external voltmeter.  
5. Send the command VDATA <vlo>,<vhi> where <vlo> and <vhi> are the values  
read from the voltmeter when the VLO and VHI commands were sent. When the  
power supply is calibrated, the low to high voltage program calibration values  
are stored as constants.  
6. Program the supply at various levels using the VSET command to confirm that  
the calibration was successful and that linearity is observed. See the voltage  
program accuracy specification in Section 1.  
7. Turn off calibration mode by sending the command CMODE OFF or CMODE 0  
to the power supply.  
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Operating Manual for RS-232 for XT/HPD Series Power Supply  
 
       
Calibration  
Voltage Mode Calibration  
Voltage 1. Set the power supply for calibration as in Figure 4.1.  
Readback  
Calibration  
Procedure  
2. Activate calibration mode by sending command CMODE ON or CMODE 1 to  
the power supply.  
3. Send command VRLO; IRLO to the power supply. Wait for the supply to settle.  
Measure and record the output shown on the external voltmeter. Send VRLO  
again.  
4. Send VRHI; IRHI to the supply. Wait for the supply to settle. Measure and  
record the output voltage shown on the external voltmeter. Send VRHI again.  
5. Send the command VRDAT <vlo>,<vhi> where <vlo> and <vhi> are the values  
read from the voltmeter after the VRLO and VRHI commands were sent. The  
processor calculates the offset value required to calibrate the power supply.  
When the power supply is calibrated, the low to high voltage readback  
calibration values (offsets) are stored as constants.  
6. Use commands VSET and VOUT? commands to confirm that the calibration  
was successful and that linearity is observed. Refer to the voltage readback  
accuracy specification in Section 1.  
7. Turn off calibration mode by sending the command CMODE OFF or CMODE 0  
to the power supply.  
Release 1.1  
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Calibration  
Current Mode Calibration  
Current Mode Calibration  
Current 1. Disconnect the load from the power supply to be calibrated.  
Calibration  
2. Connect a shunt across the supply's output terminals. Ensure the shunt is rated to  
Setup  
handle the maximum voltage and current output from the supply.  
3. Connect a voltmeter across the shunt.  
Figure 4.2 Current Calibration Setup  
Current 1. Connect the shunt and voltmeter to the power supply as shown in Figure 4.2.  
Program  
Calibration  
Procedure  
2. Activate calibration mode by sending command CMODE ON or CMODE 1 to  
the power supply.  
3. Send command ILO; VLO to the power supply. Measure and record the output  
shown on the external voltmeter.  
4. Send command IHI; VHI to the supply Measure and record the output voltage  
shown on the external voltmeter.  
5. Calculate ILO and IHI from the voltages read from the external voltmeter and  
the shunt resistance. I=V/R.  
6. Send the command IDATA <ilo>,<ihi> to the power supply. <ilo> and <ihi> are  
the current values obtained from sending the ILO and IHI commands to the  
power supply. When the power supply is calibrated, the low to high current  
program calibration values are stored as constants.  
7. Program the supply at various levels using the ISET command to confirm that  
the calibration was successful and that linearity is observed. Refer to the current  
program accuracy specification in Section 1.  
8. Turn off calibration mode by sending the command CMODE OFF or CMODE 0  
to the power supply.  
56  
Operating Manual for RS-232 for XT/HPD Series Power Supply  
 
       
Calibration  
Current Mode Calibration  
Current 1. Connect the current shunt and voltmeter to the power supply as shown in  
Readback  
Calibration  
Procedure  
Figure 4.2.  
2. Activate calibration mode by sending command CMODE ON or CMODE 1 to  
the power supply.  
3. Send command IRLO; VRLO to the power supply. Wait for the supply to settle.  
Measure and record the output voltage shown on the external voltmeter. Send  
IRLO again.  
4. Send command IRHI; VRHI to the supply. Wait for the supply to settle. Measure  
and record the output voltage shown on the external voltmeter. Send IRHI again.  
5. Calculate IRLO and IRHI from the voltages taken from the external voltmeter  
and the shunt resistance. I=V/R.  
6. Send the command IRDAT <ilo>,<ihi> to the power supply. <ilo> and <ihi> are  
the current values obtained from sending the IRLO and IRHI commands to the  
power supply. When the power supply is calibrated, the low to high current  
readback calibration values are stored as constants.  
7. Program the supply at various levels using the ISET command to confirm that  
the calibration was successful and that linearity is observed. Refer to the current  
readback accuracy specification in Section 1.  
8. Turn off calibration mode by sending the command CMODE OFF or CMODE 0  
to the power supply.  
Release 1.1  
57  
 
 
Calibration  
Over Voltage Protection (OVP) Calibration  
Over Voltage Protection (OVP) Calibration  
We recommend that you perform OVP calibration every six months. Connecting a  
digital voltmeter as in “Voltage Calibration Setup” is optional.  
1. Disconnect all loads from the power supply.  
2. Ensure that jumper J95 on the interface PCB is CLOSED to enable remote OVP  
calibration (Jumper J95 is closed at the factory). See Figure 2.3, RS-232  
Interface PCB continued., p. 18 for the location on the PCB of jumper J95.  
3. Activate calibration mode by sending command CMODE ON or CMODE 1 to  
the power supply.  
4. Send the command OVCAL to the power supply. The ADDR LED will light  
during OVP calibration. Calibration is complete when the ADDR LED turns off.  
This may take a few minutes.  
5. Use the OVSET, OVSET?, and VSET commands to trip the OVP level,  
confirming that the calibration was successful. When you trip the OVP level, the  
red OVP LED will light and the voltage will drop to zero. Send the command  
RST to clear the OVP condition. Refer to the OVP program accuracy  
specification in Section 1.  
6. Turn off calibration mode by sending the command CMODE OFF or CMODE 0  
to the power supply.  
58  
Operating Manual for RS-232 for XT/HPD Series Power Supply  
 
 
 
Xantrex Technology Inc.  
8999 Nelson Way  
Burnaby, British Columbia  
Canada V5A 4B5  
604 422 8595 Tel  
604 421 3056 Fax  
800 667 8422 Toll Free North America  
PRINTED IN CANADA  
TM-RS6H-01XN  
 

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