KEPCO TMA VXI-27 - Manual (Page 47)

B-4
TMA VXI-27 101602
B.11 *SRE — SERVICE REQUEST ENABLE COMMAND
*SRE
Syntax: *SRE<integer> where <integer> = value from 0 - 255 per Table B-3, except bit 6 cannot be pro-
grammed.
Description: Sets the condition of the Service Request Enable register. The Service Request Enable register
determines which events of the Status Byte Register are summed into the MSS (Master Status Sum-
mary) and RQS (Request for Service) bits. RQS is the service request bit that is cleared by a serial
poll, while MSS is not cleared when read. A "1" (1 = set = enable, 0 = reset = disable) in any Service
Request Enable register bit position enables the corresponding Status Byte bit to set the RQS and
MSS bits. All the enabled Service Request Enable register bits then are logically ORed to cause Bit 6
of the Status Byte Register (MSS/RQS) to be set. Related Commands: *SRE?, *STB?. (See exam-
ple, Figure B-1.)
B.12 *SRE? — SERVICE REQUEST ENABLE QUERY
*SRE?
Syntax: *SRE? Response: <integer> = value from 0 - 255 per Table B-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 B-1.)
B.13 *STB? — STATUS BYTE REGISTER QUERY
*STB?
Syntax: *STB? Response: <integer> value from 0 to 255 per Table B-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; ands RQS will be reset.) Related Commands: *SRE, *SRE?. (See example,
Figure B-1.)
B.14 *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
subsystem 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 exe-
cute the command). Related Commands: ABOR, INIT, TRIG, CURR:TRIG, VOLT:TRIG. (See
example, Figure B-1. )
B.15 *TST? — SELF TEST QUERY
*TST?
Syntax: *TST? Returned value: 0 or 1 (0 = pass test, 1 = fail test)
TABLE B-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. C.44)
NU (Not Used)