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7.9 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 are among the parallel commands.

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 4. 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.

*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 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.

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Ametek Lx Series II Programming Manual Manuale Utente Pagina 165