Tektronix Welding System 070 9197 00 User Manual
Programmer Manual  
PS2520G & PS2521G  
Programmable Power Supplies  
070-9197-00  
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WARRANTY  
Tektronix warrants that this product will be free from defects in materials and  
workmanship for a period of one (1) year from the date of shipment. If any such product  
proves defective during this warranty period, Tektronix, at its option, either will repair the  
defective product without charge for parts and labor, or will provide a replacement in  
exchange for the defective product.  
In order to obtain service under this warranty, Customer must notify Tektronix of the defect  
before the expiration of the warranty period and make suitable arrangements for the  
performance of service. Customer shall be responsible for packaging and shipping the  
defective product to the service center designated by Tektronix, with shipping charges  
prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to  
a location within the country in which the Tektronix service center is located. Customer  
shall be responsible for paying all shipping charges, duties, taxes, and any other charges for  
products returned to any other locations.  
This warranty shall not apply to any defect, failure or damage caused by improper use or  
improper or inadequate maintenance and care. Tektronix shall not be obligated to furnish  
service under this warranty a) to repair damage resulting from attempts by personnel other  
than Tektronix representatives to install, repair or service the product; b) to repair damage  
resulting from improper use or connection to incompatible equipment; or c) to service a  
product that has been modified or integrated with other products when the effect of such  
modification or integration increases the time or difficulty of servicing the product.  
THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS  
PRODUCT IN LIEU OF ANY OTHER WARRANTIES, EXPRESSED OR  
IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED  
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR  
PURPOSE. TEKTRONIX’ RESPONSIBILITY TO REPAIR OR REPLACE  
DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY  
PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY.  
TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY  
INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES  
IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS  
ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  
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Table of Contents  
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
v
Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Setting Up the GPIB System . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Connecting a Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Setting the Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Testing the GPIB Connection . . . . . . . . . . . . . . . . . . . . . . . . . .  
1
1
2
3
4
Syntax and Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
SCPI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Commands and Queries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Command Syntax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Command Header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Message Terminator and Message Separator . . . . . . . . . . . .  
Entering Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Command Characters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Abbreviating Commands . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Combining Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Summary of Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
General Setting Commands . . . . . . . . . . . . . . . . . . . . . . . . .  
Status Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Miscellaneous Commands . . . . . . . . . . . . . . . . . . . . . . . . . .  
5
5
5
6
6
7
9
9
9
10  
10  
12  
12  
13  
16  
Command Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
*CLS (No Query Form) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
*ESE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
*ESR? (Query Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
*IDN? (Query Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
INSTrument:NSELect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
INSTrument[:SELect] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
INSTrument:COUPle:TRACking . . . . . . . . . . . . . . . . . . . . . . .  
MEASure[:SCALar]:CURRent[:DC]? (Query Only) . . . . . . . .  
MEASure[:SCALar]:VOLTage[:DC]? (Query Only) . . . . . . . .  
*OPC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
OUTPut:PROTection:CLEar (No Query Form) . . . . . . . . . . . .  
OUTPut[:STATe] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
*RST (No Query Form) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
[SOURce:]CURRent[:LEVel][:IMMediate][:AMPLitude] . . . .  
19  
19  
19  
20  
20  
21  
21  
22  
22  
23  
23  
23  
24  
24  
25  
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Table of Contents  
[SOURce:]CURRent:PROTection:STATe . . . . . . . . . . . . . . . . .  
26  
27  
27  
28  
29  
29  
30  
30  
30  
31  
[SOURce:]VOLTage[:LEVel][:IMMediate][:AMPLitude] . . . .  
[SOURce:]VOLTage:PROTection[:LEVel] . . . . . . . . . . . . . . . .  
*SRE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
STATus:OPERation:CONDition? (Query Only) . . . . . . . . . . . .  
STATus:OPERation:ENABle . . . . . . . . . . . . . . . . . . . . . . . . . .  
STATus:OPERation[:EVENt]? . . . . . . . . . . . . . . . . . . . . . . . . .  
STATus:OPERation:INSTrument:CONDition? (Query Only) .  
STATus:OPERation:INSTrument:ENABle . . . . . . . . . . . . . . . .  
STATus:OPERation:INSTrument[:EVENt]? . . . . . . . . . . . . . . .  
STATus:OPERation:INSTrument:ISUMmary<n>:CONDition?  
(Query Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
STATus:OPERation:INSTrument:ISUMmary<n>:ENABle . . .  
STATus:OPERation:INSTrument:ISUMmary<n>[:EVENt]? . .  
STATus:PRESet (No Query Form) . . . . . . . . . . . . . . . . . . . . . .  
STATus:QUEue[:NEXT]? (Query Only) . . . . . . . . . . . . . . . . . .  
STATus:QUEStionable:CONDition? (Query Only) . . . . . . . . .  
STATus:QUEStionable:ENABle . . . . . . . . . . . . . . . . . . . . . . . .  
STATus:QUEStionable[:EVENt]? . . . . . . . . . . . . . . . . . . . . . . .  
STATus:QUEStionable:INSTrument:CONDition?  
31  
32  
33  
33  
33  
34  
34  
35  
(Query Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
STATus:QUEStionable:INSTrument:ENABle . . . . . . . . . . . . .  
STATus:QUEStionable:INSTrument[:EVENt]? . . . . . . . . . . . .  
STATus:QUEStionable:INSTrument:ISUMmary<n>  
35  
35  
36  
:CONDition? (Query Only) . . . . . . . . . . . . . . . . . . . . . . . . .  
STATus:QUEStionable:INSTrument:ISUMmary<n>:ENABle  
STATus:QUEStionable:INSTrument:ISUMmary<n>[:EVENt]?  
*STB? (Query Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
SYSTem:AUTO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
SYSTem:ERRor? (Query Only) . . . . . . . . . . . . . . . . . . . . . . . .  
SYSTem:VERSion? (Query Only) . . . . . . . . . . . . . . . . . . . . . .  
*TST? (Query Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
*WAI (No Query Form) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
36  
37  
37  
38  
38  
39  
39  
40  
40  
Status and Events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
System Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Status Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
SCPI Status Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
IEEE-488.1 and IEEE-488.2 Status Registers . . . . . . . . . . .  
41  
41  
44  
44  
49  
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Table of Contents  
Enable Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
52  
52  
52  
53  
53  
54  
54  
54  
54  
Event Status Enable Register (ESER) . . . . . . . . . . . . . . . . .  
Service Request Enable Register (SRER) . . . . . . . . . . . . . .  
OPERation Enable Register . . . . . . . . . . . . . . . . . . . . . . . . .  
QUEStionable Enable Register . . . . . . . . . . . . . . . . . . . . . .  
Queues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Output Queue . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Error/Event Queue . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
57  
List of Figures  
Figure 1: Typical GPIB Network Configuration . . . . . . . . .  
Figure 2: GPIB Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Figure 3: Tree Hierarchy . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Figure 4: Command Header . . . . . . . . . . . . . . . . . . . . . . . . . .  
Figure 5: Command Header with Parameter . . . . . . . . . . . .  
Figure 6: QUEStionable INSTrument Registers . . . . . . . . . .  
Figure 7: Status and Event System . . . . . . . . . . . . . . . . . . . .  
Figure 8: STATus Hierarchy of SCPI Defined Registers . . .  
Figure 9: Status Registers and Related Commands . . . . . . .  
Figure 10: Status Byte Register (SBR) . . . . . . . . . . . . . . . . . .  
Figure 11: The Standard Event Status Register (SESR) . . .  
Figure 12: Event Status Enable Register (ESER) . . . . . . . . .  
Figure 13: Service Request Enable Register (SRER) . . . . . .  
2
3
6
7
7
42  
43  
44  
45  
49  
50  
52  
53  
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Table of Contents  
List of Tables  
Table 1: Parameter Types for Syntax Descriptions . . . . . . .  
8
12  
13  
16  
24  
46  
47  
Table 2: General Setting Commands . . . . . . . . . . . . . . . . . .  
Table 3: Status Commands . . . . . . . . . . . . . . . . . . . . . . . . . .  
Table 4: Miscellaneous Commands . . . . . . . . . . . . . . . . . . . .  
Table 5: State of Control Settings after *RST . . . . . . . . . . .  
Table 6: QUEStionable Status Register . . . . . . . . . . . . . . . .  
Table 7: QUEStionable INSTrument Status Register . . . . .  
Table 8: QUEStionable INSTrument ISUMmary<n> Status  
Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
48  
50  
51  
55  
Table 9: SBR Bit Functions . . . . . . . . . . . . . . . . . . . . . . . . . .  
Table 10: SESR Bit Functions . . . . . . . . . . . . . . . . . . . . . . . .  
Table 11: Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
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Preface  
This manual explains how to use and program the PS2520G and  
PS2521G Programmable Power Supplies over the General Purpose  
Interface Bus (GPIB). The following sections make up the body of  
this manual:  
H Getting Started describes how to set up the power supply and  
GPIB systems.  
H Syntax and Commands describes the structure of messages your  
program sends to the power supply.  
H Status and Events describes how to use the event messages in  
your programs.  
For more information about the GPIB, refer to the standards  
IEEE 488.1-1987, IEEE 488.2-1992, and SCPI-1994 (Standard  
Commands for Programmable Instruments).  
Refer to the PS2520, PS2520G, PS2521 & PS2521G User Manual  
(070-9196-XX) for product specifications, safety summary, operating  
and service information, and a list of standard accessories for the  
programmable power supplies.  
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Preface  
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Getting Started  
With a computer (controller), you can operate the PS2520G and  
PS2521G Programmable Power Supplies over the GPIB. This section  
explains how to perform the following tasks:  
H Set up GPIB systems  
H Connect the programmable power supply to a GPIB controller  
H Set GPIB address of the programmable power supply  
H Test the GPIB connection  
Setting Up the GPIB System  
Observe these rules when you set up the programmable power supply  
with a GPIB system:  
H Each device on the bus needs a unique device address. No two  
devices can share the same device address.  
H Do not connect more than 15 devices to any one bus.  
H Connect one device for every 2 m (6 ft) of cable used.  
H Do not use more than 20 m (65 ft) of cable to connect devices to  
a bus.  
H Turn on at least two-thirds of the devices on the GPIB system  
while you use the system.  
H Configure the devices on the system as shown in Figure 1. Do not  
use loop or parallel configurations.  
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Getting Started  
GPIB Device  
GPIB Device  
GPIB Device  
GPIB Device  
GPIB Device  
GPIB Device  
GPIB Device  
Figure 1: Typical GPIB Network Configuration  
Connecting a Controller  
You must have a GPIB controller, such as a PC with a GPIB card, to  
operate the programmable power supplies over the GPIB interface.  
Figure 2 on page 3 shows the location of the GPIB port on the rear  
panel.  
Connect the programmable power supply to a GPIB controller as  
follows:  
1. Connect one end of a GPIB cable to the GPIB controller.  
2. Connect the other end of the GPIB cable to the GPIB port on the  
programmable power supply.  
3. Turn on the programmable power supply.  
4. Turn on the GPIB controller.  
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Getting Started  
GPIB port  
Figure 2: GPIB Port  
Setting the Address  
Change the GPIB address of the programmable power supply using  
the following procedure:  
NOTE. Each device connected to the same controller must have a  
unique GPIB address. The factory default address for the PS2520G  
and PS2521G Programmable Power Supplies is 12.  
1. Make sure the AUTO SEQ function is off. (The indicator for  
AUTO must be off).  
2. Press LOCAL → (number) → (return ) to enter the GPIB  
address of the power supply. (The address must be a number  
between 0 and 30.)  
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Getting Started  
3. To check the address setting of the power supply, press the  
LOCAL button again. The display remains active for about  
3 seconds to allow you to view or change the setting.  
Testing the GPIB Connection  
To test whether the GPIB connection is working, send a GPIB query  
from the computer. For example, the query  
*idn?  
should return the name of the instrument, SCPI version, and  
firmware version in the following form:  
TEKTRONIX,<model>,0,SCPI:<year> FW<version>  
If you do not get a proper response from the programmable power  
supply, check to make sure the power is on, all cable connections are  
secure, and the GPIB address is correct.  
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Syntax and Commands  
This section provides an overview of the commands for the PS2520G  
and PS2521G Programmable Power Supplies. This section includes  
the following topics:  
H A brief introduction to SCPI  
H A description of the command syntax  
H Instructions on how to enter commands  
H A summary of commands by functional group  
In addition, the section Command Descriptions on page 19 lists the  
commands alphabetically and provides a detailed description for  
each command.  
The commands for the programmable power supplies are compatible  
with IEEE-488.1, IEEE-488.2, and SCPI-1994.0 standards.  
SCPI  
SCPI (Standard Commands for Programmable Instruments) is a  
standard created by an international consortium of the major  
manufacturers of test and measurement equipment. SCPI uses  
IEEE-488.2 syntax to provide common commands for the identical  
functions of various programmable instruments.  
The standard simplifies the task of programming a group of  
instruments that use SCPI. Instead of having to learn different  
commands for every instrument, the programmer may use the same  
commands for the identical functions of each instrument.  
Commands and Queries  
The controller sends instructions to the instrument in the form of  
commands or queries. Commands modify control settings or tell the  
instrument to perform a specific action. Queries cause the instrument  
to send data or status information back to the controller. A question  
mark at the end of a command identifies it as a query.  
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Syntax and Commands  
Different product manuals may also use the terms “program  
messages” or simply “commands” to refer to commands and queries  
as a whole. This manual uses the term “commands” to mean any  
type of instruction from the controller to the programmable  
instrument.  
Command Syntax  
Any instruction that you send to an instrument that complies with  
SCPI must have at least three basic elements:  
H Command header  
H Parameter (if required)  
H Message terminator or separator  
Command Header  
The command header has a hierarchical structure that can be  
represented by a command tree (Figure 3). A mnemonic designates  
each level of the hierarchy. A colon separates the levels.  
The top level of the tree is the root level. A root node is a mnemonic  
at the root level. A root node and one or more lower-level nodes  
form a header path to the last node called the leaf node.  
:SOURce  
Root node  
:CURRent  
:VOLTage  
:LIST  
Lower-level  
nodes  
:LEVel  
:PROTection  
:STATe  
Leaf node  
:STATe?  
Figure 3: Tree Hierarchy  
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Syntax and Commands  
The header path and leaf node together form the command header.  
Figure 4 shows the command header for the leaf node indicated in  
Figure 3.  
:SOURce:CURRent:PROTection:STATe  
Root Node  
Header Path  
Leaf Node  
Command Header  
Figure 4: Command Header  
Parameter  
You must include values for commands that have parameters. In this  
manual, the < > symbols enclose the parameter type when stating  
the syntax of the command. For example, the syntax of the command  
in Figure 5 includes the Boolean parameter type.  
:SOURce:CURRent:PROTection:STATe <Boolean>  
Parameter  
Type  
Space  
Figure 5: Command Header with Parameter  
Table 1 defines the Boolean and other parameter types for the  
programmable power supplies.  
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Syntax and Commands  
Table 1: Parameter Types for Syntax Descriptions  
Parameter Type  
Description  
Example  
Boolean  
Boolean numbers or values  
ON or 1  
OFF or 0  
NR1  
NR2  
NR3  
NRf  
Integers  
0, 1, 15  
Decimal numbers  
Floating point numbers  
NR1, NR2, or NR3  
1.2, 3.141516, 6.5  
3.1E–1, 2.01E+1  
1, 1.2, 3.1E–1  
“No error”  
string  
Alphanumeric characters (must be within  
quotation marks)  
MAXimum|MINimum Special mnemonics for setting the parame- MAX, MIN  
ter to the largest or smallest value the  
instrument allows.  
For the actual value of the parameter type <Boolean>, you may enter  
0 or OFF or you may enter 1 or ON.  
For the command in Figure 5, entering 0 or OFF turns the overcur-  
rent protection (OCP) off and entering 1 or ON turns the OCP on.  
The following example includes both the header and a value for the  
parameter type:  
SOURce:CURRent:PROTection:STATe OFF  
Parameter values that appear in this manual are often separated by a  
vertical line. This vertical line means the same thing as the word  
“or.” For example, values for the parameter <Boolean> are  
0|1|OFF|ON  
This is the same thing as saying “0 or 1 or OFF or ON.” Any single  
value is a valid parameter.  
NOTE. Do not include the <, >, or | symbols when entering the  
actual value for a parameter.  
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Syntax and Commands  
Message Terminator and Message Separator  
In accordance with IEEE 488.2-1992, the accept any of the following  
message terminators:  
H LF^END  
Line feed code (hexadecimal 0A) with END  
message  
H LF  
Line feed code  
H <dab>^END  
Last data byte with END message  
These terminators are compatible with most controller application  
programs.  
A semicolon separates one command from another when the  
commands appear on the same line.  
Entering Commands  
The standards that govern the command set for the programmable  
power supplies allow for a certain amount of flexibility when you  
enter commands. For example, you can abbreviate many commands  
or combine commands into one message that you send to the  
programmable power supply. This flexibility, called friendly  
listening, saves programming time and makes the command set  
easier to remember and use.  
Command Characters  
The programmable power supplies are not sensitive to the case of  
command characters. You can enter commands in either uppercase or  
lowercase.  
You can precede any command with white space characters. White  
space characters include a space or any combination of the ASCII  
control characters hexadecimal 00 through 1F except for the  
character 0A (line feed). You must, however, use at least one space  
between the parameter and the command header.  
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Syntax and Commands  
Abbreviating Commands  
Most commands have a long form and a short form. The listing for  
each command in this section shows the abbreviations in upper case.  
For example, you can enter the query SOURce:VOLTage? simply as  
SOUR:VOLT? (or sour:volt?).  
The brackets around a mnemonic indicate that the programmable  
power supply assumes this level of the command header by default.  
It is not necessary, therefore, for this mnemonic to appear as part of  
the header when you send the command. For example, you can  
abbreviate the command  
[SOURce:]VOLTage[:LEVel][:IMMediate][AMPLitude] 10  
to  
volt 10  
Because the programmable power supply assumes that a command  
starts from the root, you have the option of beginning the initial  
command header with a colon (:).  
Combining Commands  
You can combine (concatenate) commands and queries using a  
semicolon (;). The programmable power supply executes concate-  
nated commands in the order it receives them. When you concate-  
nate queries, the programmable power supply combines the  
responses into a single response message. For example, if the current  
and voltage limits are set to 1 A and 20 V, the command  
curr?;volt?  
returns the message  
0.100E+1;0.200E+2  
If the command that follows the semicolon has a different header  
path from the root level, you must use a colon to force a return to the  
root level:  
MEASure:CURRent?;:OUTPut:STATe?  
If the command that follows the semicolon has the same header path,  
you may omit the colon and the path and state only the new leaf  
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Syntax and Commands  
node. This makes it possible, for example, to shorten the concate-  
nated query  
:MEASure:CURRent?;:MEASure:VOLTage?  
into  
MEASure:CURRent?;VOLTage?  
You can combine commands and queries into the same message.  
Note, for example, the following combination:  
sour:volt 10;:sour:volt?  
or  
sour:volt 10;volt?  
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Syntax and Commands  
Summary of Commands  
The tables in this section summarize the command set of the  
programmable power supplies. These tables divide the commands  
into the following functional groups:  
H General Setting Commands  
H Status Commands  
H Miscellaneous Commands  
The tables also provide a brief description of each command.  
General Setting Commands  
Table 2 lists the general setting commands that control and query the  
settings of the power supply. To a large extent, the commands  
duplicate the function of the front panel controls and indicators.  
Table 2: General Setting Commands  
Command  
Description  
INSTrument:NSELect 1|2|3  
INSTrument:NSELect?  
Selects output 1, 2, or 3.  
Returns selected output.  
Selects output 1, 2, or 3.  
INSTrument[:SELect] <identifier>  
OUT1|OUT2|OUT3  
INSTrument[:SELect]?  
Returns selected output.  
INSTrument:COUPle:TRACking?  
Returns selected independent, parallel-  
tracking, or series-tracking mode.  
INSTrument:COUPle:TRACking  
NONE|PARallel|SERies  
Selects independent, parallel-tracking, or  
series-tracking mode.  
Returns actual output current.  
Returns actual output voltage.  
MEASure[:SCALar]:CURRent[:DC]?  
MEASure[:SCALar]:VOLTage[:DC]?  
OUTPut:PROTection:CLEar  
Clears overvoltage and overcurrent  
protection errors.  
Sets the output state on or off.  
OUTPut[:STATe] <Boolean>  
OUTPut[:STATe]?  
Returns the output state (on or off).  
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Syntax and Commands  
Table 2: General Setting Commands (Cont.)  
Command  
Description  
Sets the current limit.  
[SOURce:]CURRent[:LEVel]  
[:IMMediate][:AMPLitude]  
<NRf>|MAX|MIN  
Returns the current-limit setting.  
[SOURce:]CURRent[:LEVel]  
[:IMMediate][:AMPLitude]?  
Sets the Overcurrent Protection (OCP) on  
or off.  
[SOURce:]CURRent  
:PROTection:STATe <Boolean>  
Returns the state of the Overcurrent  
[SOURce:]CURRent  
Protection (OCP) setting as either on or off.  
:PROTection:STATe?  
Sets the voltage limit.  
[SOURce:]VOLTage[:LEVel]  
[:IMMediate][:AMPLitude]  
<NRf>|MAX|MIN  
Returns the voltage limit setting.  
[SOURce:]VOLTage[:LEVel]  
[:IMMediate][:AMPLitude]?  
Sets the overvoltage protection (OVP) level.  
[SOURce:]VOLTage  
:PROTection[:LEVel] <NRf>|MAX|MIN  
Returns the overvoltage protection (OVP)  
setting.  
[SOURce:]VOLTage  
:PROTection[:LEVel]?  
Status Commands  
Table 3 lists the status commands that set and query the various  
registers and queues that make up the status and event structure of  
the programmable power supplies.  
Table 3: Status Commands  
Command  
*CLS  
Description  
Clears the status data structures.  
Sets the Event Status Enable Register  
(ESER).  
*ESE <NRf>  
Returns contents of Event Status Enable  
Register (ESER).  
*ESE?  
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Syntax and Commands  
Table 3: Status Commands (Cont.)  
Command  
Description  
Returns and clears the contents of Standard  
Event Status Register (SESR).  
*ESR?  
Returns the contents of the OPERation  
condition register. Returns NR1.  
STATus:OPERation:CONDition?  
STATus:OPERation:ENABle <NRf>  
STATus:OPERation:ENABle?  
STATus:OPERation[:EVENt]?  
Sets the contents of the enable mask for the  
OPERation event register.  
Returns the contents of the enable mask for  
the OPERation event register. Returns NR1.  
Returns and clears the contents of the  
OPERation event register.  
Returns the contents of the OPERation  
INSTrument condition register. Returns  
NR1.  
STATus:OPERation:INSTruĆ  
ment:CONDition?  
Sets the contents of the enable mask for the  
OPERation INSTrument event register.  
STATus:OPERation:INSTrument:ENĆ  
ABle <NRf>  
Returns the contents of the enable mask for  
the OPERation INSTrument event register.  
Returns NR1.  
STATus:OPERation:INSTrument:ENĆ  
ABle?  
Returns and clears the contents of the  
OPERation INSTrument event register.  
STATus:OPERation:INSTruĆ  
ment[:EVENt]?  
Returns the contents of the OPERation  
INSTrument ISUMmary<n> condition  
register (ISUMmary1, ISUMmary2, or  
ISUMmary3). Returns NR1.  
STATus:OPERation:INSTrument:ISUMĆ  
mary<n>:CONDition?  
Sets the contents of the enable mask for the  
OPERation INSTrument ISUMmary<n>  
event register (ISUMmary1, ISUMmary2, or  
ISUMmary3).  
STATus:OPERation:INSTrument:ISUMĆ  
mary<n>:ENABle <NRf>  
Returns the contents of the enable mask for  
the OPERation INSTrument ISUMmary<n>  
event register (ISUMmary1, ISUMmary2, or  
ISUMmary3). Returns NR1.  
STATus:OPERation:INSTrument:ISUMĆ  
mary<n>:ENABle?  
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Syntax and Commands  
Table 3: Status Commands (Cont.)  
Command  
Description  
Returns and clears the contents of the  
OPERation INSTrument ISUMmary<n>  
event register (ISUMmary1, ISUMmary2, or  
ISUMmary3).  
STATus:OPERation:INSTrument:ISUMĆ  
mary<n>[:EVENt]?  
Presets the OPERation and QUEStionable  
status registers.  
STATus:PRESet  
Reads the next item from the error/event  
queue.  
SYSTem:ERRor?  
Reads the next item from the error/event  
queue (identical to SYSTem:ERRor?).  
STATus:QUEue[:NEXT]?  
Returns the contents of the QUEStionable  
condition register. Returns NR1.  
STATus:QUEStionable:CONDition?  
STATus:QUEStionable:ENABle <NRf>  
STATus:QUEStionable:ENABle?  
Sets the contents of the enable mask for the  
QUEStionable event register.  
Returns the contents of the enable mask for  
the QUEStionable event register. Returns  
NR1.  
Returns and clears the contents of the  
QUEStionable event register.  
STATus:QUEStionable[:EVENt]?  
Returns the contents of the QUEStionable  
INSTrument condition register. Returns  
NR1.  
STATus:QUEStionable:INSTruĆ  
ment:CONDition?  
Sets the contents of the enable mask for the  
QUEStionable INSTrument event register.  
STATus:QUEStionable:INSTruĆ  
ment:ENABle <NRf>  
Returns the contents of the enable mask for  
the QUEStionable INSTrument event  
register. Returns NR1.  
STATus:QUEStionable:INSTruĆ  
ment:ENABle?  
Returns and clears the contents of the  
QUEStionable INSTrument event register.  
STATus:QUEStionable:INSTruĆ  
ment[:EVENt]?  
Returns the contents of the QUEStionable  
INSTrument ISUMmary condition register  
(ISUMmary1, ISUMmary2, or ISUMmary3).  
Returns NR1.  
STATus:QUEStionable:INSTruĆ  
ment:ISUMmary<n>:CONDition?  
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Syntax and Commands  
Table 3: Status Commands (Cont.)  
Command  
Description  
Sets the contents of the enable mask for the  
QUEStionable INSTrument ISUMmary  
event register (ISUMmary1, ISUMmary2, or  
ISUMmary3).  
STATus:QUEStionable:INSTruĆ  
ment:ISUMmary<n>:ENABle <NRf>  
Returns the contents of the enable mask for  
the QUEStionable INSTrument ISUMmary  
event register (ISUMmary1, ISUMmary2, or  
ISUMmary3). Returns NR1.  
STATus:QUEStionable:INSTruĆ  
ment:ISUMmary<n>:ENABle?  
Returns and clears the contents of the  
QUEStionable INSTrument ISUMmary  
event register (ISUMmary1, ISUMmary2, or  
ISUMmary3).  
STATus:QUEStionable:INSTruĆ  
ment:ISUMmary<n>[:EVENt]?  
Sets contents of Service Request Enable  
Register (SRER).  
*SRE <NRf>  
*SRE?  
Returns contents of Service Request Enable  
Register (SRER).  
Reads Status Byte Register (SBR).  
*STB?  
Miscellaneous Commands  
Table 4 lists the miscellaneous commands that control general  
housekeeping functions of the programmable power supplies.  
Table 4: Miscellaneous Commands  
Command  
*IDN?  
Description  
Returns instrument identification.  
Reports when operation is complete by  
*OPC  
setting the Operation Complete bit in SESR.  
Reports when operation is complete. Same  
as *OPCexcept returns a 1 to the output  
queue and does not set the SESR bit.  
*OPC?  
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Syntax and Commands  
Table 4: Miscellaneous Commands (Cont.)  
Command  
Description  
Resets the protection levels and states,  
resets the current and voltage levels to zero,  
sets the output off, and sets memory point to  
00.  
*RST  
Initiates internal self-test and reports results.  
*TST?  
*WAI  
Wait to continue. This command forces  
sequential operation of commands. This  
command is required by IEEE 488.1-1987.  
The power supply, however, forces sequen-  
tial operation of commands by design.  
Returns the SCPI version level.  
SYSTem:VERSion?  
SYSTem:AUTO <Boolean>  
SYSTem:AUTO?  
1
Sets Auto Sequence on or off.  
1
Returns Auto Sequence mode.  
1
Not a SCPI standardized command.  
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Syntax and Commands  
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Command Descriptions  
This section provides an alphabetical listing and a detailed  
description of each command. It also provides examples of each  
command and what the query form might return.  
*CLS (No Query Form)  
Clears the following status data structures:  
H Standard Event Status Register  
H Operation Event Status Register  
H Questionable Event Status Registers  
H Error/Event Queue  
Syntax  
*CLS  
Examples  
*CLS clears all event registers.  
*ESE  
Sets or returns the bits in the Event Status Enable Register  
(ESER).The ESER enables the Standard Event Status Register  
(SESR) to be summarized on bit 5 (ESB) of the Status Byte Register  
(SBR). Refer to Figure 12 on page 52 for an illustration of the ESER.  
Syntax  
*ESE <NRf>  
*ESE?  
Parameters  
<NR1> is a number from 0 to 255. The binary bits of the ESER are set  
according to this value.  
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Returns  
<NR1> is a number from 0 to 255 that indicates the decimal value of  
the binary bits of the ESER.  
Examples  
*ESE 48 sets the ESER to binary 0011 0000, which enables the  
CME and EXE bits.  
*ESE? returns 129 if the ESER contains the binary value 1000 0001.  
*ESR? (Query Only)  
Returns and clears the contents of the Standard Event Status Register  
(SESR). Refer to Figure 11 on page 50 for an illustration of the  
SESR.  
Syntax  
*ESR?  
Returns  
<NR1> is a number from 0 to 255 that indicates the decimal value of  
the binary bits of the SESR.  
Examples  
*ESR? returns 160, if the SESR contains binary 1010 0000 (PON and  
CME bits set).  
*IDN? (Query Only)  
Returns the unique identification code of the power supply.  
Syntax  
*IDN?  
Examples  
*IDN? returns  
TEKTRONIX,PS2521G,0,SCPI:94.0 FW:.10  
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Syntax and Commands  
INSTrument:NSELect  
Selects Output 1, Output 2, or Output3. Only one output may be  
selected at a time for configuration.  
Syntax  
INSTrument:NSELect <NR1>  
INSTrument:NSELect?  
Parameters  
1|2|3  
Returns  
1|2|3  
Examples  
INSTrument:NSELect 2 selects Output 2.  
INSTrument:NSELect? returns 3 if Output 3 is selected.  
INSTrument[:SELect]  
Selects Output 1, Output 2, or Output3. An output must be selected  
before it can be configured and only one output may be selected at a  
time.  
Syntax  
INSTrument[:SELect] <identifier>  
INSTrument[:SELect]?  
Parameters  
OUT1|OUT2|OUT3  
Returns  
OUT1|OUT2|OUT3  
Examples  
INSTrument[:SELect] OUT1 selects Output 1.  
INSTrument[:SELect]? returns OUT2 if Output 2 is selected.  
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Syntax and Commands  
INSTrument:COUPle:TRACking  
Selects independent, parallel-tracking, or series-tracking mode.  
Syntax  
INSTrument:COUPle:TRACking<identifier>  
INSTrument:COUPle:TRACking?  
Parameters  
NONE|PARallel|SERies  
NONE is independent mode  
PARallel is parallel-tracking mode  
SERies is series-tracking mode  
Returns  
NONE|PARallel|SERies  
Examples  
INSTrument:COUPle:TRACkingNONE selects the independent mode.  
INSTrument:COUPle:TRACking? returns SERies if series-tracking  
mode is selected.  
MEASure[:SCALar]:CURRent[:DC]? (Query Only)  
Returns actual output current.  
Syntax  
MEASure[:SCALar]:CURRent[:DC]?  
Returns  
<NR3>  
Examples  
MEASure:CURRent? might return 0.8E-2 to indicate that the load is  
drawing 0.008 A (8 mA).  
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MEASure[:SCALar]:VOLTage[:DC]? (Query Only)  
Returns actual output voltage or sense input voltage.  
MEASure[:SCALar]:VOLTage[:DC]?  
<NR3>  
Syntax  
Returns  
Examples  
MEASure:VOLTage? might return 0.367E+1 to indicate the voltage at  
the output is 3.67 V.  
*OPC  
The command form (*OPC) sets the operation complete bit (bit 0) in  
the Standard Event Status Register (SESR) when all pending  
operations finish.  
The query form (*OPC?) tells the programmable power supply to  
place an ASCII 1 in the Output Queue when the power supply  
completes all pending operations.  
Syntax  
*OPC  
*OPC?  
Returns  
1
OUTPut:PROTection:CLEar (No Query Form)  
Resets (clears) the Overvoltage Protection. This command duplicates  
the function of the OVP RESET button.  
Syntax  
OUTPut:PROTection:CLEar  
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Syntax and Commands  
OUTPut[:STATe]  
Enables or disables the output of the power supply. ON (enabled) is  
signified by a 1 and OFF (disabled) by a 0. The query form returns a  
1 if the output is on and a 0 if the output is off.  
Syntax  
OUTPut:STATe <Boolean>  
OUTPut:STATe?  
Parameters  
0|1|OFF|ON  
Returns  
0|1  
Examples  
OUTPut:STATe ON enables the power supply output.  
OUTPut:STATe? returns 1 if the power supply output is enabled.  
*RST (No Query Form)  
Resets the control settings of the programmable power supply to a  
set of known states but does not purge stored settings. Refer to  
Table 5 for the reset state of the control settings.  
Table 5: State of Control Settings after *RST  
Front Panel  
Control  
Related Command  
State  
OFF  
0
OUTPUT  
OUTPut[:STATe]  
CURRENT SET  
[SOURce:]CURRent[:LEVel]  
[:IMMediate][:AMPLitude]  
VOLTS SET  
[SOURce:]VOLTage[:LEVel]  
[:IMMediate][:AMPLitude]  
0
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Syntax and Commands  
Table 5: State of Control Settings after *RST (Cont.)  
Front Panel  
Control  
Related Command  
State  
OCP  
[SOURce:]CURRent:PROTection  
:STATe  
ON  
ON/OFF  
DELAY  
—
SYSTem:AUTO  
—
0
AUTO SEQ  
OFF  
00  
RECALL  
(memory  
location)  
OVP SET  
[SOURce:]VOLTage:PROTection  
[:LEVel]  
MAXimum  
(PS2520G = 38.5 V  
PS2521G = 22.5 V)  
SERIES/INDEP  
PARA/INDEP  
NONE  
INSTrument:COUPle:TRACking  
Syntax  
*RST  
[SOURce:]CURRent[:LEVel][:IMMediate][:AMPLitude]  
Sets the current limit. The query form returns the current limit  
setting.  
Syntax  
[SOURce:]CURRent[:LEVel][:IMMediate]  
[:AMPLitude] <NRf>|MAXimum|MINimum  
[SOURce:]CURRent[:LEVel][:IMMediate]  
[:AMPLitude]?  
Parameters  
On the PS2520G, <NRf> ranges from 0 to 1.500 (amps) for Output 1  
and Output 2 and 0 to 3.000 (amps) for Output 3.  
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On the PS2521G <NRf> ranges from 0 to 2.500 (amps) for Output 1  
and Output 2 and 0 to 5.000 (amps) for Output 3.  
Returns  
<NR3>  
Examples  
SOURce:CURRent 1.5 sets the current limit to 1.5 amps.  
SOURce:CURRent? returns 0.1000E+1 if the current limit setting is  
1 amp.  
[SOURce:]CURRent:PROTection:STATe  
Sets the overcurrent protection on or off. The query form returns the  
state of the overcurrent protection as either on or off.  
Syntax  
[SOURce:]CURRent:PROTect:STATe <Boolean>  
[SOURce:]CURRent:PROTect:STATe?  
Parameters  
0|1|OFF|ON  
OFF or 0 sets overcurrent protection off. ON or 1 sets overcurrent  
protection on.  
Returns  
0|1  
Examples  
SOURce:CURRent:PROTect:STATe OFF sets the overcurrent  
protection off.  
SOURce:CURRent:PROTect:STATe? returns 1 if the overcurrent  
protection is on.  
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Syntax and Commands  
[SOURce:]VOLTage[:LEVel][:IMMediate][:AMPLitude]  
Sets the voltage limit of the power supply. The query form returns  
the voltage limit setting.  
Syntax  
[SOURce:]VOLTage <NRf>|MAXimum|MINimum  
[SOURce:]VOLTage?  
Parameters  
On the PS2520G, <NRf> is a positive integer or real number from 0  
to 37.00 volts for Output 1 and Output 2 and 0 to 6.50 volts for  
Output 3.  
On the PS2521G, <NRf> is a positive integer or real number from 0  
to 21.00 volts for Output 1 and Output 2 and 0 to 6.50 volts for  
Output 3.  
Returns  
<NR3>  
Examples  
SOURce:VOLTage 3.5 sets the voltage limit to 3.5 volts.  
SOURce:VOLTage? returns 0.200E+1 if the voltage limit setting is  
2 volts.  
[SOURce:]VOLTage:PROTection[:LEVel]  
Sets the overvoltage protection level. The query form returns the  
present setting of the overvoltage protection circuit.  
Syntax  
[SOURce:]VOLTage:PROTection[:LEVel] <NRf>|MAXimum|  
MINimum  
[SOURce:]VOLTage:PROTection[:LEVel]?  
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Syntax and Commands  
Parameters  
On the PS2520G, <NRf> ranges from 0 to 38.50 volts for Output 1  
and Output 2 and 0 to 7.00 volts for Output 3.  
On the PS2521G, <NRf> ranges from 0 to 22.50 volts for Output 1  
and Output 2 and 0 to 7.00 volts for Output 3.  
Returns  
<NR3>  
Examples  
VOLTage:PROTection24.5 sets the overvoltage protection to  
24.5 volts.  
VOLTage? returns 0.3100E+2 if the overvoltage protection setting is  
31 volts.  
*SRE  
Sets the contents of the Service Request Enable Register (SRER).  
The query form returns the contents of the SRER. Bit 6 of the SRER  
is always zero. The bits on the SRER correspond to the bits on the  
SBR. Refer to Table 9 on page 50 for an explanation of each bit in  
the SBR. Refer to page 52 for additional information about enable  
registers.  
Syntax  
*SRE <NRf>  
*SRE?  
Parameters  
<NRf> is an integer from 0 to 255.  
Returns  
<NR1>  
Examples  
*SRE 8 sets bits of the SRER to 0000 1000.  
*SRE? returns 2 if the SRER is set to 0000 0010.  
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Syntax and Commands  
STATus:OPERation:CONDition? (Query Only)  
Returns the contents of the OPERation register. The PS2520G and  
PS2521G Programmable Power Supplies, however, do not use the  
OPERation register to report any conditions.  
Reading the OPERation register does not affect its contents.  
STATus:OPERation:CONDition?  
<NR1>  
Syntax  
Returns  
Examples  
STATus:OPERation:CONDition? returns 0.  
STATus:OPERation:ENABle  
Sets or returns the contents of the OPERation Enable Register. Even  
though this is a 16-bit register, only 15 bits (bit 0 through bit 14) are  
used. Bit 15 is always 0.  
Syntax  
STATus:OPERation:ENABle <NRf>  
STATus:OPERation:ENABle?  
Parameters  
<NR1> is an integer from 0 to 32767.  
Returns  
<NR1>  
Examples  
STATus:OPERation:ENABle 32767 sets all 15 bits of the register  
high.  
STATus:OPERation:ENABle? returns 0 if all 15 bits of the register  
are low.  
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Syntax and Commands  
STATus:OPERation[:EVENt]?  
Returns and clears the contents of the OPERation register. The  
response is a decimal value that summarizes the binary values of the  
set bits.  
Syntax  
STATus:OPERation[:EVENt]?  
<NR1>  
Returns  
Examples  
STATus:OPERation:EVENt? returns 0.  
STATus:OPERation:INSTrument:CONDition? (Query Only)  
Returns the contents of the OPERation INSTrument register. The  
PS2520G and PS2521G Programmable Power Supplies, however, do  
not use the OPERation INSTrument register to report any conditions.  
Reading the OPERation INSTrument register does not affect its  
contents.  
Syntax  
STATus:OPERation:INSTrument:CONDition?  
Returns  
<NR1>  
Examples  
STATus:OPERation:INSTrument:CONDition? returns 0.  
STATus:OPERation:INSTrument:ENABle  
Sets or returns the contents of the OPERation INSTrument Enable  
Register. Even though this is a 16-bit register, only 15 bits (bit 0  
through bit 14) are used. Bit 15 always reads 0.  
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Syntax and Commands  
Syntax  
STATus:OPERation:INSTrument:ENABle <NRf>  
STATus:OPERation:INSTrument:ENABle?  
Parameters  
<NR1> is an integer from 0 to 32767.  
Returns  
<NR1>  
Examples  
STATus:OPERation:INSTrument:ENABle 32767 sets all 15 bits of  
the register high.  
STATus:OPERation:INSTrument:ENABle? returns 0 if all 15 bits of  
the register are low.  
STATus:OPERation:INSTrument[:EVENt]?  
Returns and clears the contents of the OPERation INSTrument  
register. The response is a decimal value that summarizes the binary  
values of the set bits.  
Syntax  
STATus:OPERation:INSTrument[:EVENt]?  
Returns  
<NR1>  
Examples  
STATus:OPERation:INSTrument:EVENt? returns 0.  
STATus:OPERation:INSTrument:ISUMmary<n>:CONDition?  
(Query Only)  
Returns the contents of the OPERation INSTrument ISUMmary<n>  
register. The PS2520G and PS2521G Programmable Power Supplies,  
however, do not use the OPERation INSTrument ISUMmary<n>  
register to report any conditions.  
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Syntax and Commands  
Reading the OPERation INSTrument ISUMmary<n> register does  
not affect its contents.  
Syntax  
STATus:OPERation:INSTrument:ISUMmary<n>:CONDition?  
Returns  
Examples  
0
STATus:OPERation:INSTrument:ISUMmary1:CONDition?  
returns 0.  
STATus:OPERation:INSTrument:ISUMmary<n>:ENABle  
Sets or returns the contents of the OPERation INSTrument  
ISUMmary<n> Enable Register. Even though this is a 16-bit register,  
only 15 bits (bit 0 through bit 14) are used. Bit 15 always reads 0.  
Syntax  
STATus:OPERation:INSTrument:ISUMmary<n>:ENABle <NRf>  
STATus:OPERation:INSTrument:ISUMmary<n>:ENABle?  
Parameters  
<NR1> is an integer from 0 to 32767.  
Returns  
<NR1>  
Examples  
STATus:OPERation:INSTrument:ISUMmary1:ENABle 32767 sets all  
15 bits of the register high.  
STATus:OPERation:INSTrument:ISUMmary1:ENABle? returns 0 if  
all 15 bits of the register are low.  
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Syntax and Commands  
STATus:OPERation:INSTrument:ISUMmary<n>[:EVENt]?  
Returns and clears the contents of the OPERation INSTrument  
ISUMmary<n> register. The response is a decimal value that  
summarizes the binary values of the set bits.  
Syntax  
STATus:OPERation:INSTrument:ISUMmary<n>[:EVENt]?  
Returns  
<NR1>  
Examples  
STATus:OPERation:INSTrument:ISUMmary1:EVENt? returns 0.  
STATus:PRESet (No Query Form)  
Sets the OPERation and QUEStionable enable registers to zeros, the  
INSTrument enable registers to ones, and ISUMmary registers to  
zeros.  
Syntax  
STATus:PRESet  
STATus:QUEue[:NEXT]? (Query Only)  
Reads the next item from the Error and Event Queue. Refer to the  
error codes in Table 11 on page 55. This query is identical to the  
SYSTem:ERRor? query.  
Syntax  
STATus:QUEue[:NEXT]?  
Returns  
<NR1>,<string>  
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Syntax and Commands  
Examples  
STATus:QUEue? returns 0, No error" if there are no errors in the  
queue.  
STATus:QUEStionable:CONDition? (Query Only)  
Returns the contents of the QUEStionable condition register.  
Reading the QUEStionable condition register does not affect its  
contents. This query returns a decimal value that summarizes the  
binary values of the set bits.  
Syntax  
STATus:QUEStionable:CONDition?  
Returns  
<NR1>  
STATus:QUEStionable:ENABle  
Sets or returns the contents of the enable register for the QUEStion-  
able event register. Even though this is a 16-bit register, only 15 bits  
(bit 0 through bit 14) are used. Bit 15 always reads 0.  
Syntax  
STATus:QUEStionable:ENABle <NR1>  
STATus:QUEStionable:ENABle?  
Parameters  
<NR1> is a positive integer from 0 to 32767.  
Returns  
<NR1>  
Examples  
STATus:QUEStionable:ENABle 32767 sets all 15 bits of the register  
high.  
STATus:QUESTionable:ENABle? returns 0 if all 15 bits of the  
register are low.  
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Syntax and Commands  
STATus:QUEStionable[:EVENt]?  
Returns and clears the contents of the QUEStionable event register.  
Reading the QUEStionable register using the query form resets the  
register. The query returns a decimal value that summarizes the  
binary values of the set bits.  
Syntax  
STATus:QUEStionable[:EVENt]?  
<NR1>  
Returns  
Examples  
STATus:QUEStionable:EVENt? returns 2 if bit number 1 is the only  
bit set.  
STATus:QUEStionable:INSTrument:CONDition? (Query  
Only)  
Returns the contents of the QUEStionable INSTrument condition  
register. Reading the QUEStionable INSTrument condition register  
does not affect its contents. This query returns a decimal value that  
summarizes the binary values of the set bits.  
Syntax  
STATus:QUEStionable:INSTrument:CONDition?  
Returns  
<NR1>  
STATus:QUEStionable:INSTrument:ENABle  
Sets or returns the contents of the enable register for the QUEStion-  
able INSTrument event register. Even though this is a 16-bit register,  
only 15 bits (bit 0 through bit 14) are used. Bit 15 always reads 0.  
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Syntax and Commands  
Syntax  
STATus:QUEStionable:INSTrument:ENABle <NR1>  
STATus:QUEStionable:INSTrument:ENABle?  
Parameters  
<NR1> is a positive integer from 0 to 32767.  
Returns  
<NR1>  
Examples  
STATus:QUEStionable:INSTrument:ENABle 32767 sets all 15 bits  
of the register high.  
STATus:QUESTionable:INSTrument:ENABle? returns 0 if all 15 bits  
of the register are low.  
STATus:QUEStionable:INSTrument[:EVENt]?  
Returns and clears the contents of the QUEStionable INSTrument  
event register. Reading the QUEStionable INSTrument register using  
the query form resets the register. The query returns a decimal value  
that summarizes the binary values of the set bits.  
Syntax  
STATus:QUEStionable:INSTrument[:EVENt]?  
Returns  
<NR1>  
Examples  
STATus:QUEStionable:INSTrument:EVENt? returns 2 if bit  
number 1 is the only bit set.  
STATus:QUEStionable:INSTrument:ISUMmary<n>  
:CONDition? (Query Only)  
Returns the contents of the QUEStionable INSTrument ISUMma-  
ry<n> condition register. Reading the QUEStionable INSTrument  
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Syntax and Commands  
ISUMmary<n> condition register does not affect its contents. This  
query returns a decimal value that summarizes the binary values of  
the set bits.  
Syntax  
STATus:QUEStionable:INSTrument:ISUMmary<n>:CONDition?  
<NR1>  
Returns  
STATus:QUEStionable:INSTrument:ISUMmary<n>:ENABle  
Sets or returns the contents of the enable register for the QUEStion-  
able INSTrument ISUMmary<n> event register. Even though this is  
a 16-bit register, only 15 bits (bit 0 through bit 14) are used. Bit 15  
always reads 0.  
Syntax  
STATus:QUEStionable:INSTrument:ISUMmary<n>:ENABle <NR1>  
STATus:QUEStionable:INSTrument:ISUMmary<n>:ENABle?  
Parameters  
<NR1> is a positive integer from 0 to 32767.  
Returns  
<NR1>  
Examples  
STATus:QUEStionable:INSTrument:ISUMmary<n>:ENABle 32767  
sets all 15 bits of the register high.  
STATus:QUESTionable:INSTrument:ISUMmary<n>:ENABle? returns  
0 if all 15 bits of the register are low.  
STATus:QUEStionable:INSTrument:ISUMmary<n>[:EVENt]?  
Returns and clears the contents of the QUEStionable INSTrument  
event register. Reading the QUEStionable INSTrument register using  
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Syntax and Commands  
the query form resets the register. The query returns a decimal value  
that summarizes the binary values of the set bits.  
STATus:QUEStionable:INSTrument:ISUMmary<n>[:EVENt]?  
<NR1>  
Syntax  
Returns  
Examples  
STATus:QUEStionable:INSTrument:ISUMmary<n>:EVENt? returns  
2 if bit number 1 is the only bit set.  
*STB? (Query Only)  
Returns the contents of the Status Byte Register (SBR) using the  
Master Summary Status (MSS) bit. Refer to Figure 10 on page 49.  
Syntax  
*STB?  
Returns  
Examples  
<NR1>  
*STB? returns 96 if the SBR contains the binary value 0110 0000.  
SYSTem:AUTO  
Sets or returns automatic sequence setting.  
Syntax  
SYSTem:AUTO <Boolean>  
SYSTem:AUTO?  
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Syntax and Commands  
Parameters  
0|1|OFF|ON  
OFF or 0 sets AUTO off, ON or 1 sets AUTO on.  
Returns  
0|1  
Examples  
SYSTem:AUTO 1 sets AUTO SEQ on.  
SYSTem:ERRor? (Query Only)  
Reads the next item from the Error and Event Queue. Refer to the  
error codes in Table 11 on page 55. This query is identical to the  
STATus:QUEue[:NEXT]? query.  
Syntax  
SYSTem:ERRor?  
Returns  
Examples  
<NR1>, <string>  
SYSTem:ERRor? returns -300, DeviceĆspecific error;  
overvoltage protection error" if the overvoltage protection  
circuit has disabled the outputs.  
SYSTem:VERSion? (Query Only)  
Returns the SCPI version to which the power supply complies.  
Syntax  
SYSTem:VERSion?  
Returns  
1994.0  
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Syntax and Commands  
*TST? (Query Only)  
Tests RAM, ROM, DAC, and ADC components.  
Syntax  
*TST?  
Returns  
Examples  
0|-300  
*TST? returns 0 if the test is successful.  
*TST? returns -300 if the test fails.  
*WAI (No Query Form)  
The IEEE 488.2 standard requires the WAI command as part of the  
standard command set. WAI prevents the programmable instrument  
from executing further commands or queries until all pending  
operations finish. This command, however, does not serve a useful  
function on the PS2520G and PS2521G Programmable Power  
Supplies The power supplies do not have any operations that require  
additional time to finish.  
Syntax  
*WAI  
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Status and Events  
The PS2520G and PS2521G Programmable Power Supplies provide  
a status and event reporting system for the GPIB interface. Various  
registers and queues make up this system. This section explains how  
these registers and queues work to inform you of significant events.  
System Structure  
Figure 7 on page 43 is a simplified diagram of the status and event  
reporting system. In reality, each component of the diagram  
represents a set of registers and queues that read, report, or enable  
the occurrence of certain events within the system.  
Status reporting begins when a specific event in the programmable  
power supply sets a bit in a status register. Reading the status  
registers tells you what types of events have occurred.  
Each bit in the status register corresponds to a bit in an enable  
register; the enable bit must be high for the event to be reported to  
the Status Byte Register.  
The Output Queue stores and reports query responses. The  
Error/Event Queue stores and reports error messages.  
A Service Request (SRQ) is the last event to occur. The SRQ  
requests an interrupt on the GPIB to report events to the system  
controller.  
The following sections explain the registers and queues in greater  
detail.  
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Status and Events  
STATus:QUEStionable:INSTrument:ISUMmary1  
STATus:QUEStionable:INSTrument:  
Not Used  
0
Output1 VOLTage  
Output1 CURRent  
Not Used  
0
ISUMmary1  
1
1
ISUMmary2  
ISUMmary3  
Not Used  
Not Used  
Not Used  
Not Used  
Not Used  
Not Used  
Not Used  
2
2
3
Not Used  
3
4
Not Used  
4
5
Not Used  
5
Not Used  
6
6
7
Not Used  
Not Used  
7
8
8
9
Output1 OVP  
Output1 OCP  
9
10  
10  
Not Used 11  
Not Used 11  
Not Used  
12  
Not Used  
12  
Not Used 13  
Not Used 13  
Not Used  
Not Used  
14  
15  
Not Used  
Not Used  
14  
15  
STATus:QUEStionable:INSTrument:ISUMmary2  
Output2 VOLTage  
Output2 CURRent  
Not Used  
0
1
QUEStionable Status (SCPI)  
2
Not Used  
3
SUMmary VOLTage  
0
1
Not Used  
4
SUMmary CURRent  
Not Used  
Not Used  
5
2
Not Used  
6
Not Used  
3
Not Used  
Not Used  
7
Not Used  
4
8
Not Used  
5
Output2 OVP  
Output2 OCP  
9
Not Used  
6
10  
Not Used  
7
Not Used 11  
Not Used  
8
Not Used  
12  
SUMmary OVP  
SUMmary OCP  
9
To  
Status  
Byte, Bit 3  
Not Used 13  
10  
Not Used  
Not Used  
14  
15  
Not Used 11  
Not Used  
12  
13  
14  
15  
STATus:QUEStionable:INSTrument:ISUMmary3  
Not Used  
Not Used  
0
1
2
3
4
5
6
7
8
9
Output3 VOLTage  
Output3 CURRent  
Not Used  
Not Used  
STATus:QUEStionable:CONDition?  
STATus:QUEStionable[:EVENt]?  
STATus:QUEStionable:ENABle  
Not Used  
Not Used  
Not Used  
Not Used  
Not Used  
Output3 OVP  
Output3 OCP 10  
Not Used 11  
Not Used  
12  
Not Used 13  
Not Used  
Not Used  
14  
15  
Figure 6: QUEStionable INSTrument Registers  
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Status and Events  
SYSTem:ERRor?  
(SCPI)  
From QUEStionable STATus (SCPI)  
Error/Event Queue  
Status Byte  
IEEE 488 Registers  
Status Register  
(
IEEE-488.1)  
Not Used  
Not Used  
*STB?  
*SRE  
(
IEEE-488.2)  
0
1
2
3
4
5
6
7
OPC  
Not Used  
QYE  
0
1
2
3
4
5
6
7
*ESR?  
*ESE  
E/E  
SRQ  
QUES  
MAV  
DDE  
EXE  
CME  
USR  
PON  
ESB  
RQS/MSS  
OPER  
Output Queue  
OPERation Status (SCPI)  
(
IEEE-488.1)  
0
1
Not Used  
Not Used  
Not Used  
Not Used  
Not Used  
Not Used  
Not Used  
Not Used  
Not Used  
Not Used  
Not Used  
Not Used  
Not Used  
Not Used  
Not Used  
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
STATus:OPERation:CONDition?  
STATus:OPERation[:EVENt]?  
STATus:OPERation:ENABle  
Not Used 15  
Figure 7: Status and Event System  
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Status and Events  
Status Registers  
The programmable power supplies use status registers that are  
defined by SCPI, IEEE-488.1, and IEEE-488.2 standards.  
SCPI Status Registers  
The power supplies include two status registers defined by the SCPI  
standard:  
H OPERation Status Registers (CONDition, EVENt, and ENABle)  
H QUEStionable Status Registers (CONDition, EVENt, and  
ENABle)  
The STATus subsystem (Figure 8) is the hierarchical set of  
commands that read the SCPI defined status registers.  
STATus  
:QUEStionable  
:OPERation :PRESet  
:QUEue  
:CONDition  
:ENABle  
:CONDition  
:ENABle  
[:EVENt]?  
[:EVENt]?  
[:EVENt]?  
Figure 8: STATus Hierarchy of SCPI Defined Registers  
The lower-level nodes :OPERation and :QUEStionable each have  
three 16-bit registers: CONDition, EVENt, and ENABle. Figure 9  
shows the sequential relationship between these three types of  
registers and the commands that relate to each register.  
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Status and Events  
Condition  
Register  
Event  
Register  
Enable  
Register  
To SBR  
STAT:OPER:COND STAT:OPER:[EVEN]?  
STAT:QUES:COND STAT:QUES:[EVEN]?  
STAT:OPER:ENAB  
STAT:QUES:ENAB  
Figure 9: Status Registers and Related Commands  
The CONDition register is a read-only register that monitors the  
current state of the instrument. The CONDition register updates in  
real time and the inputs are not latched or buffered. When a  
condition monitored by the CONDition register becomes true, the bit  
for that condition also becomes true (1). When the condition is false,  
the bit is 0.  
The read-only EVENt register latches any false-to-true change in  
condition. Once the bit in the EVENt register is set, it is no longer  
affected by changes in the corresponding bit of the CONDition  
register. The bit remains set until the controller reads it. The  
command *CLS (Clear Status) clears the EVENt registers.  
ENABle registers control the reporting of events latched in the  
EVENt registers. The QUEStionable Enable Register, for example,  
sets the summary bit (3) of the Status Byte Register true only if one  
or more of the bits in the QUEStionable Event Register are true. The  
programmable power supply can assert SRQ (Service Request) on  
the GPIB only after the ENABle register sets the summary bit true.  
OPERation Status Registers. Although the OPERation Status  
Registers are present, the programmable power supplies do not use  
them to report any status information.  
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Status and Events  
QUEStionable Status Register. Table 6 shows the bit designations of  
the 16 bit QUEStionable Status Register.  
Table 6: QUEStionable Status Register  
Bit Number  
Name  
Condition (Bit is True)  
0
VOLTage  
Constant Current (CC). One or more of  
Channel 1, Channel 2, or Channel 3 voltages  
are unregulated.  
1
CURRent  
Constant Voltage (CV). One or more of  
Channel 1, Channel 2, or Channel 3 currents  
are unregulated.  
2
—
Not used.  
3
—
Not used.  
4
—
Not used.  
5
—
Not used.  
6
—
Not used.  
7
—
Not used.  
8
—
Not used.  
9
OVP  
OCP  
—
Overvoltage protection tripped.  
Overcurrent protection tripped.  
Not used.  
10  
11  
12  
13  
—
Not used.  
—
Event on STATus:QUEStionable:INSTrument  
Register.  
14  
15  
—
—
Not used.  
Not used.  
The command STATus:QUEStionable:CONDition? reads the  
QUEStionable CONDition register but does not clear it.  
The command STATus:QUEStionable[:EVENt]? reads and clears  
the QUEStionable EVENt Status Register.  
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Status and Events  
QUEStionable INSTrument Status Register. Table 7 shows the bit  
designations of the 16-bit QUEStionable INStrument Status Register.  
Table 7: QUEStionable INSTrument Status Register  
Bit Number  
Name  
Condition (Bit is True)  
0
—
Not used.  
1
ISUMmary1 Summary of Channel 1 events.  
ISUMmary2 Summary of Channel 2 events.  
ISUMmary3 Summary of Channel 3 events.  
2
3
4
—
—
—
—
—
—
—
—
—
—
—
—
Not used.  
Not used.  
Not used.  
Not used.  
Not used.  
Not used.  
Not used.  
Not used.  
Not used.  
Not used.  
Not used.  
Not used.  
5
6
7
8
9
10  
11  
12  
13  
14  
15  
The command STATus:QUEStionable:INSTrument:CONDition?  
reads the QUEStionable INSTrument CONDition register but does  
not clear it.  
The command STATus:QUEStionable:INSTrument[:EVENt]? reads  
and clears the QUEStionable INSTrument EVENt Status Register.  
QUEStionable INSTrument ISUMmary<n> Status Register. Table 8  
shows the bit designations of the three16-bit QUEStionable  
INSTrument ISUMmary<n> Status Registers (ISUMmary1,  
ISUMmary2, and ISUMmary3).  
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Status and Events  
Table 8: QUEStionable INSTrument ISUMmary<n> Status  
Register  
Bit Number  
Name  
Output<n> Output<n> Constant Current (CC), voltage  
Voltage unregulated.  
Output<n> Output<n> Constant Voltage (CV), current  
Condition (Bit is True)  
0
1
Current  
unregulated.  
Not used.  
Not used.  
Not used.  
Not used.  
Not used.  
Not used.  
Not used.  
2
3
4
5
6
7
8
9
—
—
—
—
—
—
—
Output<n> Output<n> overvoltage protection tripped.  
OVP  
10  
Output<n> Output<n> overcurrent protection tripped.  
OCP  
11  
12  
13  
14  
15  
—
—
—
—
—
Not used.  
Not used.  
Not used.  
Not used.  
Not used.  
The command STATus:QUEStionable:INSTrument:ISUMmaĆ  
ry<n>:CONDition? reads the QUEStionable INSTrument ISUMma-  
ry<n> CONDition register but does not clear it.  
The command STATus:QUEStionable:INSTrument:ISUMmaĆ  
ry<n>[:EVENt]? reads and clears the QUEStionable INSTrument  
ISUMmary<n> EVENt Status Register.  
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Status and Events  
IEEE-488.1 and IEEE-488.2 Status Registers  
The power supplies also include two status registers defined by  
IEEE-488.1 and IEEE-488.2 standards:  
H Status Byte Register (SBR)  
H Standard Event Status Register (SESR)  
Status Byte Register (SBR). The SBR (Figure 10) summarizes the  
status of all other registers and queues.  
6
RQS  
6
7
5
4
3
2
1
0
Ċ
Ċ
OPER  
ESB MAV QUES E/E  
MSS  
Figure 10: Status Byte Register (SBR)  
Use a serial poll or the *STB? query to read the contents of the SBR.  
The bits in the SBR are set and cleared depending on the contents of  
the Standard Event Status Register (SESR), the Event Status Enable  
Register (ESER), and the Output Queue. When you use a serial poll  
to obtain the SBR, bit 6 is the MSS bit. Reading the SBR does not  
clear the bits.  
Table 9 explains the function of each bit in the SBR.  
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Status and Events  
Table 9: SBR Bit Functions  
Bit  
Function  
0 (LSB)  
Not used. This bit is always zero.  
Not used. This bit is always zero.  
1
2
E/E (Error and Event) indicates an error code is waiting to be  
read in the Error Event Queue  
3
QUES (QUEStionable) is the summary bit for the QESR  
(QUEStionable Event Status Register). When this bit is high it  
indicates that status is enabled and present in the QESR.  
4
5
MAV (Message Available) indicates that output is available in  
the output queue.  
ESB (Event Status Bit) is the summary bit for the Standard  
Event Status Register (SESR). When this bit is high it indicates  
that status is enabled and present in the SESR.  
6
RQS (Request Service) is obtained from a serial poll. This bit  
shows that the power supply requests service from the GPIB  
controller.  
MSS (Master Status Summary) is obtained from *STB? query.  
This bit indicates another bit in the SBR has been enabled and  
is set.  
7 (MSB)  
OPER (OPERation) is the summary bit for the OESR  
(OPERation EVENt Status Register). This bit is never set in the  
PS2520G and PS2521G Programmable Power Supplies.  
Standard Event Status Register (SESR). Figure 11 shows the SESR.  
The SESR records five types of events that can occur within the  
power supply.  
7
6
5
4
3
2
1
0
OPC  
Ċ
PON USR CME EXE DDE QYE  
Figure 11: The Standard Event Status Register (SESR)  
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Status and Events  
Use the *ESR? query to read the SESR. Reading the SESR clears the  
bits of the register so that the register can accumulate information  
about new events.  
Table 10 explains the function of each bit in the SESR.  
Table 10: SESR Bit Functions  
Bit  
Function  
0 (LSB)  
OPC (Operation Complete) shows that the operation is  
complete. This bit is set when all pending operations are  
completed following an *OPC command.  
1
2
Not used. This bit is always zero.  
QYE (Query Error) indicates a command or query protocol  
error. Error messages are listed in Table 11 (“–4XX” errors).  
3
4
DDE (Device Error) shows that a device error occurred. Error  
messages are listed in Table 11 (“–3XX” errors).  
EXE (Execution Error) shows that an error occurred while the  
power supply was executing a command or query. Table 11 lists  
the error messages (“–2XX” errors).  
5
CME (Command Error) shows that an error occurred while the  
power supply was parsing a command or query. Table 11 on  
page 55 lists the error messages (“–1XX” errors).  
6
USR (User Request) indicates the LOCAL button was pushed.  
7 (MSB)  
PON (Power On) shows that the power supply was powered  
on.  
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Status and Events  
Enable Registers  
The enable registers determine whether certain events are reported to  
the Status Byte Register and SRQ. The programmable power supply  
has the following enable registers:  
H Event Status Enable Register (ESER)  
H Service Request Enable Register (SRER)  
H OPERation Enable Register  
H QUEStionable Enable Register  
The enable registers perform a logical OR function; when one of the  
bits of the enable registers is high and the corresponding bit in the  
status register is high, the output that controls the set bit of the Status  
Byte Register is high.  
Various commands set the bits in the enable registers. The following  
sections describe the enable registers and the commands that set  
them.  
Event Status Enable Register (ESER)  
The ESER (Figure 12) controls which types of events are summa-  
rized by the Event Status Bit (ESB) in the SBR. The bits of the  
ESER correspond to the bits of the SESR. Refer to Table 10 on  
page 51 for an explanation of each bit in the SESR.  
Use the *ESE command to set the bits in the ESER. Use the *ESE?  
query to read it.  
7
6
5
4
3
2
1
0
OPC  
Ċ
PON USR CME EXE DDE QYE  
Figure 12: Event Status Enable Register (ESER)  
Service Request Enable Register (SRER)  
The SRER (Figure 13) controls which bits in the SBR generate a  
service request.  
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Status and Events  
Use the *SRE command to set the SRER. Use the *SRE? query to  
read it.  
The bits of the SRER correspond to the bits of the SBR. Refer to  
Table 9 on page 50 for an explanation of each bit in the SBR.  
7
6
5
4
3
2
E / E  
1
0
Ċ
Ċ
Ċ
OPER  
ESB MAV QUES  
Figure 13: Service Request Enable Register (SRER)  
OPERation Enable Register  
Even though the OPERation Enable Register is present in the  
programmable power supplies, the OPERation registers do not report  
any conditions.  
QUEStionable Enable Register  
The QUEStionable Enable Register controls which types of events  
are summarized by the QUES status bit in the SBR. Use the  
STATus:QUEStionable:ENABle command to set the bits in the  
QUEStionable Enable register. Use the STATus:QUEStionable:ENĆ  
ABle? query to read it. Refer to Table 6 on page 46 for a description  
of each of the bits in this register.  
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Status and Events  
Queues  
The programmable power supplies contain two queues: the Output  
Queue and the Error/Event queue.  
Output Queue  
Following IEEE 488.2 protocols, the programmable power supplies  
store query responses in the Output Queue. The power supply clears  
and resets this queue each time it receives a new command or query  
message after a message terminator. The controller must read a query  
response before it sends the next command (or query) or it loses  
responses to earlier queries.  
Error/Event Queue  
When an error or event occurs, the Error/Event Queue stores the  
message and sets bit 2 of the Status Byte Register high. Enabling this  
bit by using the *SRE 4 command causes the event to signal the  
GPIB controller with a Service Request (SRQ) signal.  
The Error/Event Queue stores and reports the messages on a  
first-in-first-out basis. The SYSTem:ERRor? or the  
STATus:QUEue[:NEXT]? query reads the next item from the  
Error/Event Queue. If the Error/Event Queue overflows, the last  
message is -350, Queue overflow"; the queue cannot store or  
report subsequent messages until it is read or cleared.  
Error Messages  
Table 11 lists the SCPI error messages for the programmable power  
supplies. The listing includes the equivalent front-panel error code  
along with a description of the error message.  
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Status and Events  
Table 11: Error Messages  
Front Panel  
Error Code  
SESR  
Bit  
SCPI Error Code and Description  
0, “No error”  
—
—
—
—
—
—
—
5
–100, “Command Error”  
–108, “Parameter not allowed”  
–109, “Missing parameter”  
–121, “Invalid character in number”  
–124, “Too many digits”  
5
5
5
5
–200, “Execution error”  
—
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
–200, “Execution error; STEP error”  
—
–221, “Setting conflict; Timer setting error”  
–221, “Setting conflict; Overvoltage protection setting error”  
–221, “Setting conflict; Address setting error”  
–221, “Setting conflict; Voltage setting error”  
–221, “Setting conflict; Current setting error”  
–221, “Setting conflict; Recall setting error”  
–221, “Setting conflict; Store setting error”  
–221, “Setting conflict; STEP voltage or current setting error”  
–222, “Data out of range; Voltage too large”  
–222, “Data out of range; Current too large”  
–222, “Data out of range; Voltage too small”  
–222, “Data out of range; Current too small”  
–222, “Data out of range”  
–064  
–065  
–066  
–067  
–068  
–069  
–070  
—
–016  
–017  
–018  
–019  
—
–240, “Hardware error”  
—
–300, “Device-specific error; Overcurrent protection error”  
–300, “Device-specific error; Overvoltage protection error”  
–012  
–013  
3
3
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Status and Events  
Table 11: Error Messages (Cont.)  
SCPI Error Code and Description  
Front Panel  
Error Code  
SESR  
Bit  
–300, “Device-specific error; Calibration current full-scale  
error”  
–091  
–092  
–093  
–094  
3
3
3
3
–300, “Device-specific error; Calibration voltage full-scale  
error”  
–300, “Device-specific error; Calibration overvoltage  
protection full-scale error”  
–300, “Device-specific error; Calibration overvoltage  
protection offset error”  
–310, “System error”  
—
3
3
3
3
3
3
3
—
–313, “Calibration memory lost”  
–330, “Self-test failed”  
—
—
–330, “Self-test failed; CPU test error”  
–330, “Self-test failed; RAM test error”  
–330, “Self-test failed; ROM test error”  
–330, “Self-test failed; DAC/ADC test error”  
–350, “Queue overflow”  
–001  
–002  
–003  
–005  
—
–410, “Query INTERRUPTED”  
—
—
—
—
2
2
2
2
–420, “Query UNTERMINATED”  
–430, “Query DEADLOCKED”  
–440, “Query UNTERMINATED after indefinite response”  
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Index  
A
E
abbreviating, command, 10  
address, setting GPIB address of  
power supply, 3  
E/E, 50  
error messages, 54–57  
ESB, 50  
*ESE, 19  
ESER, 52  
*ESR?, 20  
event reporting system, 41  
EXE, 51  
B
brackets, 10  
C
G
GPIB  
*CLS, 19  
CME, 51  
command  
configurations, 1  
connecting controller, 2  
network configuration, 2  
rules for connecting, 1  
setting address of power supply, 3  
testing the connection, 4  
abbreviating, 10  
combination, 10  
definition of, 5  
descriptions, 19  
entering, 9  
header, 6, 7  
syntax, 6  
command set  
H
alphabetical listing of. See Table  
of Contents  
header path, 6  
general setting, 12  
miscellaneous, 16  
status, 13  
status registers, 43, 45  
summary of, 12  
concatenating commands, 10  
controller, requirements for, 2  
I
*IDN?, 20  
INSTrument:COUPle:TRACking,  
22  
L
D
leaf node, 6  
DDE, 51  
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Index  
M
R
MAV, 50  
registers  
MEASure[:SCALar]  
:CURRent[DC]?, 22  
:VOLTage[:DC]?, 23  
mnemonic, 6, 10  
MSS, 50  
enable, 52  
event status enable, 52  
IEEE-488, 49  
OPERation enable, 53  
OPERation status, 44, 45  
QUEStionable enable, 53  
QUEStionable INSTrument  
ISUMmary status, 47  
QUEStionable INSTrument  
status, 47  
N
new line code, 9  
QUEStionable status, 44, 46  
service request enable, 52, 53  
standard event, 44, 50, 51  
status byte, 44, 49, 50  
RQS, 50  
O
*OPC, 23  
OPC, 51  
*RST, 24  
OPER, 50  
OUTPut:PROTection:CLEar, 23  
OUTPut[:STATe], 24  
S
SBR, 49  
SCPI  
P
explanation of, 5  
status registers, 44–48  
semicolon, 9, 10  
separator, message, 9  
SESR, 50  
[SOURce:]CURRent  
:PROTection:STATe, 26  
[:LEVel][:IMMediate][:AMPLi-  
tude], 25  
parameter, definition of, 7  
PON, 51  
Q
query, definition of, 5  
QUES, 50  
queues, 54  
error/event, 54  
output, 54  
QYE, 51  
[SOURce:]VOLTage  
[LEVel][:IMMediate][:AMPLi-  
tude], 27  
:PROTection[:LEVel], 27  
*SRE, 28  
SRER, 52, 53  
status structure, 41, 43, 44  
STATus:OPERation  
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Index  
:CONDition?, 29  
:ENABle, 29  
:INSTrument[:EVENt]?, 36  
[:EVENt]?, 35  
:INSTrument:CONDition?, 30  
:INSTrument:ENABle, 30  
:INSTrument:ISUMma-  
ry:CONDition?, 31  
:INSTrument:ISUMmary:EN-  
ABle, 32  
STATus:QUEue[:NEXT]?, 33  
*STB, 38  
SYSTem:AUTO, 38  
SYSTem:ERRor, 39  
SYSTem:VERSion?, 39  
:INSTrument:ISUMma-  
T
ry[:EVENt]?, 33  
:INSTrument[:EVENt]?, 31  
[:EVENt]?, 30  
terminator, message, 9  
tree hierarchy, depicted, 6  
*TST, 40  
STATus:PRESet, 33  
STATus:QUEStionable  
:CONDition?, 34  
:ENABle, 34  
U
USR, 51  
:INSTrument:CONDition?, 35  
:INSTrument:ENABle, 35  
:INSTrument:ISUMma-  
ry:CONDition?, 36  
:INSTrument:ISUMmary:EN-  
ABle, 37  
W
*WAI, 40  
:INSTrument:ISUMma-  
ry[:EVENt]?, 37  
white space characters, 9  
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Index  
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