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Operation
GPIB Operation
36 Operating Manual for GPIB for XHR/XFR Series Power Supply
Service
Request
Service request is a uniline message asserted by the power supply at power on and
for fault conditions. Ten (10) power supply conditions are defined as faults: CV, CC,
OV, OTP, SD, FOLD, ERR, ACF, OPF, and SNSP. See “Accumulated Status, Status,
and Fault Registers” on page 50 for more information. Power ON (PON) can also be
flagged in the fault register if the supply's rear panel power on service request
(PON SRQ) switch is set to ON. See “Power On Service Request (PON SRQ)” on
page 25.
Enabling or disabling a condition from asserting service request does not affect the
condition within the power supply, nor the external status indicators.
Serial Poll In a serial poll, the controller polls each device.
Example:
The power supply responds with a 8-bit status byte defined as follows:
Table 3.2 Serial Poll Status Register
ibrsp Return serial poll byte.
Bit
Position
Decimal
Weight
Description Reset By
0 (LSB) 1 Fault - Set when any bit in the fault
register is set by a fault condition in the
supply. See also
“Accumulated
Status, Status, and Fault Registers”
on page 50.
FAULT? query to reset
1 2 Not used
2 4 Not used
3 8 Not used
416Ready - Set when power supply is
ready to accept commands.
Power supply, during
command processing
period
532Error (ERR) - Set when ERR bit
asserted in status register. See also
“Accumulated Status, Status, and
Fault Registers” on page 50
.
ERR? query
664Request Service (SRQ) - Set when
power supply requests service.
Serial Poll
7 (MSB) 128 Power On (PON) - Set when unit
initializes at power on.
CLR or Device Clear