Command Processing R&S
®
ZVA/ZVB/ZVT
1145.1084.12 5.16 E-1
they have been received.
In order to make sure that commands are actually carried out in a certain order, each command must
be sent in a separate command line, that is to say, with a separate IBWRT()–call.
The analyzer provides only one command, INITiate<Ch>[:IMMediate], that has been
implemented for overlapped execution. What is said below is not relevant for the other (sequential)
SCPI commands.
Preventing overlapping execution
In order to prevent an overlapping execution of commands, one of commands *OPC, *OPC? or *WAI
must be used. All three commands cause a certain action only to be carried out after the hardware has
been set and has settled. By suitable programming, the controller can be forced to wait for the
respective action to occur (see table below).
Command Action after the hardware has settled Programming the controller
*OPC Setting the operation complete bit in the ESR – Setting bit 0 in the ESE
– Setting bit 5 in the SRE
– Waiting for service request (SRQ)
*OPC? Writing a "1" into the output buffer Addressing the instrument as a talker
*WAI
Executing the next command
Note: The GPIB bus handshake is not stopped
Sending the next command
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