AMETEK BPS Series Programming Manual - Manual (Page 171)

BPS / MX / RS Series SCPI Programming Manual AMETEK Programmable Power
Manual P/N 7003-961 Rev. AA 171
7.7 SCPI Command Completion
SCPI commands sent to the AC source are processed either sequentially or in parallel.
Sequential commands finish execution before a subsequent command begins. Parallel
commands allow other commands to begin executing while the parallel command is still
executing. Commands that affect list and trigger actions measurements and calibration are
among the parallel command.
The *WAI, *OPC, and *OPC? common commands provide different ways of indicating when
all transmitted commands, including any parallel ones, have completed their operations. The
syntax and parameters for these commands are described in chapter 5. Some practical
considerations for using these commands are as follows:
*WAI This prevents the AC source from processing subsequent commands until
all pending operations are completed except for transients.
*OPC? This places a 1 in the Output Queue when all pending operations have
completed. Because it requires your program to read the returned value
before executing the next program statement, *OPC? can be used to cause
the controller to wait for commands to complete before proceeding with its
program.
*OPC 1 This sets the OPC status bit when all pending operations have completed.
Since your program can read this status bit on an interrupt basis, *OPC
allows subsequent commands to be executed.
TRIG:STATe? This query will report the state of the transient trigger subsystem and will
return IDLE, ARM or BUSY to allow the user monitor the state of the trigger
system.