These are the bit assignments of the Questionable Condition Condition Register:
BIT VALUE SYMBOL DESCRIPTION
0 1 ISUM In single LAN supply, bit is always 0.
In Multi-drop system, is Instrument Summary bit.
1 2 AC AC Fail fault
2 4 OTP Over-temperature fault
3 8 FLD Fold-back protection fault
4 16 OVP Over-voltage protection fault
5 32 SO Shut-off fault, using the “J1” analog input
6 64 OFF Output Off, using the front panel button
7 128 ENA Output Enable fault, using the “J1” analog input
8 256 INPO Internal Input Overflow
9 512 INTO Internal Overflow
10 1024 ITMO Internal Time Out
11 2048 ICOM Internal Comm Error
12 to 15 N/A 0 Not used
Syntax:
STATus :QUEStionable :CONDition ?
Example: STAT :QUES :COND ?
Response: <nnn>, a number from 0 to 4095
Example:
64 (operator turned the output off using the front panel OUT button)
11.8.15. Set the Questionable Condition Enable Register
When one or more bits in the Questionable Condition Condition Register (see section 11.8.14 above) are set,
a bit can be set in the Status Byte (
*STB, see section 11.8.5). This is done by setting bits in the enable register.
Changing the value of the enable register has no affect on the value in the condition register.
Syntax:
STATus:QUEStionable:ENABle <nn>
Parameter: <nnn> is a number from 0 to 4095. The bit assignments are the
same as the table above
Example:
STAT:QUES:ENAB 4095 will cause bit 3 in the Status Byte to
be set if the supply shuts down for any fault
Query:
STAT:QUES:ENA B? will return 4094 in the example
(bit 0 always
0 for single LAN supply)
11.8.16. Read the Questionable Condition Event Register
This is a fault event register, which means bits are set to “1” as faults occur and they are not cleared until
the register value is read or the *CLS command is sent. For the fault to be latched as an event, the event
bit must be enabled as described in section 11.8.15.
The bit assignments are the same as the Questionable Condition Condition Register, described in section
11.8.14 above
Syntax:
STATus:QUEStionable[:EVENt]?
Example: STAT:QUES?
Response: <nnn>, a number from 0 to 4095
Example:
10 (the supply went into fold-back fault then the AC voltage dropped)
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