Opc? (Operation Complete Query); Pre (Parallel Poll Enable Register) *Pre? (Parallel Poll Enable Register Query) - Keysight 53147A Operating And Programming Manual

3 Programming

*OPC? (Operation Complete Query)

*OPC?
COMMAND
This query causes the instrument to place a response in the output queue when a
triggered action is complete. This allows synchronization between a controller and
the instrument using the MAV bit in the Status Byte Register. (Note that this query
does not actually "read" a state, as most queries do.)
See the section titled
that uses this command.
Single ASCII-encoded byte, 1.
QUERY
RESPONSE
None
RELATED
FRONT-PANEL
KEYS
The *OPC? query does not in any way affect the OPC bit in the Standard Event
NOTE
Status Register.
*PRE (Parallel Poll Enable Register)
*PRE? (Parallel Poll Enable Register Query)
*PRE<NRf>
COMMAND
*PRE?
Sets or queries the value of the parallel poll enable register.
<NRf>
QUERY
RESPONSE
0-255
RANGE
– The parallel poll enable register is eight bits wide and has the same bit
COMMENTS
– The status byte and parallel poll enable registers are anded together; the
258
"Using the *OPC? Command"
definitions as the status byte.
result determines the value of *IST (TRUE or FALSE).
Keysight 53147A/148A/149A Operating and Programming Guide
on page 197 for an example