KEPCO EL Series Electronic Load Operator Manual P/N 243-1295 Firmware Version 3.22 through 3.41 - Manual (Page 59)

SERIES EL 062011
A-3
A.9 *RST — RESET COMMAND
*RST
Syntax: *RST
Description: Causes system reset of EL Load. Causes a full reboot of the EL load. During the reboot, data is sent
by the EL load to the host interface (similar to that shown in Figure 3-2). The data must be received in
order for the EL load to function normally (this can be as many as 50,000 characters, taking minutes to
complete). Wait at least 200 milliseconds after all data is received before sending any commands to
the load.
*RST sets the voltage protection level to 600, Current protection to 600 (or the total current of the sys-
tem when slaves are connected), and power protection to 5000 (or 600 multiplied by the total current
of system when slaves are connected). *RST also resets damping to the factory default levels of 5 and
3, sets DEBUG:ECHO to on (see PAR. B.15), and sets SYST:REPLY to off; it does not affect any set
points.
A.10 *SRE — SERVICE REQUEST ENABLE COMMAND
*SRE
Syntax: *SRE where = 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.
A.11 *SRE? — SERVICE REQUEST ENABLE QUERY
*SRE?
Syntax: *SRE? Response: = 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?
A.12 *STB? — STATUS BYTE REGISTER QUERY
*STB?
Syntax: *STB? Response: 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 or
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.)
TABLE A-3. SERVICE REQUEST ENABLE AND STATUS BYTE REGISTER BITS
CONDITION OPER
MSS
RQS
ESB MAV QUES CSUM NU NU
BIT 7 6 5 4 3 2 1 0
VALUE 128 64 32 16 8 4 2 1
ESB Event Status Byte summary
MAV Message available
MSS Master Status Summary
NU (Not Used)
OPER Operation Status Summary
QUES QUEStionable Status Summary
RQS Request for Service