BIT 4886 051010
A-5/(A-6 Blank)
A.14 *SRE? — SERVICE REQUEST ENABLE QUERY
*SRE?
Syntax
:
*SRE?
Response: <integer> = value from 0 - 255 per Table A-3.
Description:
Reads the Service Enable Register.
Used to determine which events of the Status Byte Register are
programmed to cause the power supply to generate a service request (1 = set = function enabled, 0 =
reset = function disabled). Related Commands: *SRE, *STB? (See example, Figure A-1.)
A.15 *STB? — STATUS BYTE REGISTER QUERY
*STB?
Syntax
:
*STB?
Response: <integer> value from 0 to 255 per Table A-3.
Description:
Reads Status Byte Register without clearing it.
This Query reads the Status Byte Register (bit 6 =
MSS) without clearing it (1 = set = function enabled, 0 = reset = function disabled). The register is
cleared only when subsequent action clears all set bits. MSS is set when the power supply has one
ore more reasons for requesting service. (A serial poll also reads the Status Byte Register, except that
bit 6 = RQS, not MSS; and RQS will be reset.) Related Commands: *SRE, *SRE?. (See example, Fig-
ure A-1.)
A.16 *TRG — TRIGGER COMMAND
*TRG
Syntax
:
*TRG
Description:
Triggers the power supply to be commanded to preprogrammed values of output current and
voltage.
When the trigger is armed (checked by examining WTG bit in Status Operational Condition
register), *TRG generates a trigger signal. The trigger will change the output of the power supply to
the output voltage and current levels specified by VOLT:TRIG and CURR:TRIG commands and clear
the WTG bit in the Status Operation Condition register. If INIT:CONT has been issued, the trigger sub-
system is immediately rearmed for subsequent triggers, and the WTG bit is again set to 1. *TRG or
GET are both addressed commands (only devices selected as listeners will execute the command).
Related Commands: ABOR, INIT, TRIG, CURR:TRIG, VOLT:TRIG. (See example, Figure A-1.
)
A.17 *TST? — SELF TEST QUERY
*TST?
Syntax
:
*TST?
Returned value: 0 or non-zero (0 = pass test, non-zero = fail test)
Description:
Power Supply test.
This query causes the power supply to do a self test and provide the controller
with pass/fail results. A 0 is returned if the unit passes the test. If the unit fails, a number is returned to
indicate the cause of the error. The test executes each of the subtests even when any one fails. If any
test fails an error code bit is set which is returned to the user. The error codes returned are listed in
Table 4-1.
A.18 *WAI — WAIT-TO-CONTINUE COMMAND
*WAI
Syntax
:
*WAI
Response:
Description:
Causes the power supply to wait until all previously issued commands and queries are com-
plete before executing subsequent commands or queries.
This command can be used to guaran-
tee sequential execution of commands and queries. When all pending operations are complete (all
previous commands have been executed, changes in output level have been completed), the WAI
command is completed and execution of subsequent commands can continue.
TABLE A-3. SERVICE REQUEST ENABLE AND STATUS BYTE REGISTER BITS
CONDITION
OPER
MSS
RQS
ESB
MAV
QUES
ERR
QUE
NU
NU
BIT
7
6
5
4
3
2
1
0
VALUE
128
64
32
16
8
4
2
1
OPER Operation
Status
Summary
MSS
Master Status Summary
RQS
Request for Service
ESB
Event Status Byte summary
MAV
Message available
QUES
QUEStionable Status Summary
ERR QUE
1 or more errors occurred (see
PAR. B.80)
NU
(Not Used)
