Ametek BPS Series Programming Manual Instrukcja Użytkownika Pobierz pdf (Strona 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.

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Ametek BPS Series Programming Manual Instrukcja Użytkownika Strona 171