ABC 040104
A-5
A.12 * SAV — SAVE COMMAND
*SAV
Syntax
:
*SAV <integer> (1 to 40)
Description:
Saves the present state of output voltage, output current, overvoltage and overcurrent to the
specified memory location.
This command stores the present state of the power supply to one of 40
memory locations. The following parameters are stored by *SAV: CURR[:LEV][:IMM],
VOLT[:LEV][:IMM], CURR:PROT[:LEV], and VOLT:PROT[:LEV]. The *SAV command also saves the
language status and output on/off state. The stored values can be restored by the *RCL command.
(See example, Figure A-1.)
A.13 *SRE — SERVICE REQUEST ENABLE COMMAND
*SRE
Syntax
:
*SRE<integer> where <integer> = value from 0 - 255 per Table A-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 A-1.)
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.)
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.88)
NU
(Not Used)
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