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56 Status Reporting
Table 4-5. Generating RQS from the CC Event
Register Command Comment
Operation PTR
STAT:OPER:PTR 1024
Allows a positive transition at the CC input (bit 10) to be
latched into the Status Event register.
1
Operation Enable
STAT:OPER:ENAB 1024
Allows the latched CC event to be summed into the OPER
summary bit.
Service Request Enable
*SRE 128
Enables the OPER summary bit from the Status Byte register to
generate RQS.
Operation Condition
STAT:OPER:EVEN?
When you service the request, read the event register to
determine that bit 10 (CC) is set and to clear the register for the
next event.
1
All bits of the PTR registers bits are set to 1 at power on or in response to STAT:PRES.
Adding More Operation Events
To add the CV (constant voltage) event to this example, it is only necessary to add the decimal values for bit 8 (value 64) to
the programming commands of the Operation Status group. The commands to do this are:
STAT:OPER:PTR 1280;ENAB 1280
It is not necessary to change any other registers, since the programming for the operation summary bit (OPER) path has
already been done.
Servicing Questionable Status Events
To add OC (overcurrent) and OT (overtemperature) events to this example, program Questionable Status group bits 1 and 4.
STAT:QUES:PTR 18;ENAB 18
Next, you must program the Service Request Enable register to recognize both the questionable (QUES) and the operational
(OPER) summary bits.
*SRE 136
Now when there is a service request, read back both the operational and the questionable event registers.
STAT:OPER:EVEN?;QUES:EVEN?
Monitoring Both Phases of a Status Transition
You can monitor a status signal for both its positive and negative transitions. For example, to generate RQS when the
power supply either enters the CC (constant current) condition or leaves that condition, program the Operational Status
PTR/NTR filter as follows:
STAT:OPER:PTR 1024;NTR 1024
STAT:OPER:ENAB 1024;*SRE 128
The PTR filter will cause the OPER summary bit to set RQS when CC occurs. When the controller subsequently reads the
event register (STAT: OPER: EVEN?), the register is cleared. When CC subsequently goes false, the NTR filter causes the
OPER summary bit to again set RQS.