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Chapter 4 Remote Interface Reference
The SCPI Status Registers
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4
The Questionable Status Register
The Questionable Status register provides information about unexpected
operation of the power supply. Bit 4 reports a fault with the fan, and bit 13
summarizes questionable outputs for any of the three supplies. For example
if one of the three supplies is in constant voltage mode and due to an
overload looses regulation, bit 13 is set (latched). Send the command
STAT:QUES?
to read the register. To make use of bit 13 you must first
enable registers you wish to summarize with bit 13. Send
STAT:QUES
:INST:ENAB 14
to enable the Questionable Instrument register. Then send
STAT:QUES:INST:ISUM<n>:ENAB 3
for each supply to enable the
Questionable Instrument Summary register, where n is 1, 2, or 3.
Table 4-2. Bit Definitions - Questionable Status Register
The Questionable Instrument Status Register
The Questionable Instrument register provides information about
unexpected operations for each of the three supplies. For example if the +6V
supply is in the constant voltage mode and looses regulation, then bit 1 set
indicating a possible overload in the +6V supply. The +25V supply is
reported as bit 2, and the -25V supply as bit 3. Send the command
STAT
QUES:INST?
to read the register. The
STAT:QUES:INST:ISUM<n>
registers must be enabled to make use of the Questionable Instrument
register. Send
STAT:QUES:INST:ISUM<n>:ENAB 3
to enable output n.
The Questionable Instrument Summary Register
There are three Questionable Instrument Summary registers, one for each
supply output. These registers provide information about voltage and
current regulation. Bit 0 is set when the voltage becomes unregulated, and
bit 1 is set if the current becomes unregulated. For example if a supply
which is operating as a voltage source (constant voltage mode) momentarily
goes to constant current mode, bit 0 is set to indicate that the voltage output
is not regulated. To read the register for each supply, send
STAT:QUES
:INST:ISUM<n>?
, where n is 1, 2, or 3.
Bit
Decimal
Value
Definition
0-3 Not used 0 Always set to 0.
4 FAN 16 The fan has a fault condition.
5-12 Not Used 0 Always set to 0.
13 ISUM 8192 Summary of QUES:INST and QUES:INST:ISUM registers.
14-15 Not Used 0 Always set to 0.