The ability to generate service requests can be enabled or disabled using the SRQ command as described below.
To disable the service request capability, except for power-on, send:
To enable the service request capability for all output faults, send:
To enable the service request capability for errors, send:
To enable the service request capability for both faults and errors, send:
The Power-On Service Request. You can also cause the power supply to request service every time it is switched on
or every time there is a temporary loss in power. To do this send the following command:
If you want to disable this facility, send the command.
If you want to find out if the power-on SRQ is enabled or disabled, send the following query:
and address the supply to talk. The supply will respond with a 1 or 0 as discussed above.
Note
The power-on (PON) SRQ mode is stored in the non-volatile memory of the supply so that although the
supply may be switched off, it will remember the status of the last PON command at power-on and
respond accordingly.
Table 5-7 summarizes all the conditions under which a service request will be generated.
Condition
•
Any
•
Power-on
•
Error
•
Fault
Reprogramming Delay
The power supply may switch modes or become unregulated momentarily after a new output value is programmed.
Because of their short duration, these cases may not ordinarily be considered a fault but the supply will recognize this
deviation and generate a fault signal. To prevent this, the reprogramming delay feature is implemented.
80
Remote Operation
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Table 5-7. Conditions for Generating a Service Request
Commands Sent
PON
0
1
-
-
SRQ 0
SRQ 1
SRQ 2
SRQ 3
PON 1
PON 0
PON?
State of
RQS Bit
SRQ
0
0
-
1
2 or 3
1
1 or 3
1