
B-8
MST 488-27 013004
B.28 STATus:QUEStionable[:EVENt]? QUERY
STAT:QUES?
Syntax: Short Form: STAT:QUES[EVEN]? Long Form: STATus:QUEStionable[EVENT]?
Return Value: <int_value> actual register value
Description: Indicates questionable events that occurred since previous STAT:QUES? query. Returns the
value of the Questionable Event register (see Table B-3). The Questionable Event register is a
read-only register which holds (latches) all events. Reading the Questionable Event register clears it.
(See example, Figure B-5.)
FIGURE B-5. USING STATUS COMMANDS AND QUERIES
TABLE B-3. QUESTIONABLE EVENT REGISTER, QUESTIONABLE CONDITION REGISTER
AND QUESTIONABLE CONDITION ENABLE REGISTER BITS
CONDITION PL OL RE NU NU NU NU NU OT NU CE VE
BIT 111098 76543210
VALUE204810245122561286432168421
PL POWER LOSS
OL OVERLOAD
RE RELAY ERROR
OT OVERTEMPERATURE
CE CURRENT ERROR
VE VOLTAGE ERROR
NU NOT USED
NOTE: The selected MST power supply is assumed to be operating in cV (constant voltage) mode.
STAT:OPER:ENAB 1056 Mask enabled for CC, WTG and bits.
STAT:OPER:ENAB? Returns 1056 (32 + 1024) (CC, WTG bits set).
STAT:QUES:ENAB 3 Mask enabled for OV and OC bits (1 + 2).
STAT:QUES:ENAB? Returns 3 (1 + 2) indicating OV and OC bits are enabled.
STAT:PRES Operation Condition and Questionable Condition registers are
reset.
INIT:CONT ON Continuous triggers enabled.
STAT:OPER:COND? Power supply returns 288 (256 + 32) to indicate that power
supply is constant voltage mode and Wait For Trigger is true.
STAT:OPER? Returns 1057, e.g., indicating that since the last reading of the
Operation Event Register the power supply has entered
Constant Current mode, the Wait Trigger was set.
STAT:OPER? Returns 0 indicating no changes since previous reading of the
Operation Event register.
STAT:QUES? Returns 0 (no questionable conditions occurred since previous
reading
--- OVERCURRENT CONDITION OCCURS
STAT:QUES? Returns 2 (overcurrent protection tripped since the last
STAT:QUES? query).
STAT:QUES:COND? Returns 2, (Power supply still in overcurrent protection state).
STAT:QUES? Returns 0, (Register cleared by previous STAT:QUES?).
STAT:QUES:COND? Returns 2, (Power supply still in overcurrent protection state).
SYST:ERR? Power supply returns 0,“No error” message.
inst:sel 1 Select instrument 1
stat:ques? MST 488 responds 4 indicating instrument 1 in current mode
inst:sel 2 Select instrument 2
stat:ques? MST 488 responds 8 indicating instrument 2 in voltage mode
stat:ques:inst:isum1? MST 488 responds 4 indicating instrument 1 in current mode
stat:ques:inst:isum2? MST 488 responds 8 indicating instrument 2 in voltage mode
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