Remote Control Basics
R&S
®
SMBV100A
423
Operating Manual 1407.6062.32 ─ 08
Command synchronization using *WAI or *OPC? appended to an overlapped command
is a good choice if the overlapped command takes only little time to process. The two
synchronization techniques simply block overlapped execution of the command.
For time consuming overlapped commands it is usually desirable to allow the controller
or the instrument to do other useful work while waiting for command execution. Use one
of the following methods:
*OPC with a service request
1. Set the OPC mask bit (bit no. 0) in the ESE: *ESE 1
2. Set bit no. 5 in the SRE: *SRE 32 to enable ESB service request.
3. Send the overlapped command with *OPC
4. Wait for a service request
The service request indicates that the overlapped command has finished.
*OPC? with a service request
1. Set bit no. 4 in the SRE: *SRE 16 to enable MAV service request.
2. Send the overlapped command with *OPC?
3. Wait for a service request
The service request indicates that the overlapped command has finished.
Event Status Register (ESE)
1. Set the OPC mask bit (bit no. 0) in the ESE: *ESE 1
2. Send the overlapped command without *OPC, *OPC? or *WAI
3. Poll the operation complete state periodically (by means of a timer) using the
sequence: *OPC; *ESR?
A return value (LSB) of 1 indicates that the overlapped command has finished.
*OPC? with short timeout
1. Send the overlapped command without *OPC, *OPC? or *WAI
2. Poll the operation complete state periodically (by means of a timer) using the
sequence: <short timeout>; *OPC?
3. A return value (LSB) of 1 indicates that the overlapped command has finished. In
case of a timeout, the operation is ongoing.
4. Reset timeout to former value
5. Clear the error queue with
SYStem:ERRor?
to remove the "-410, Query interrupted"
entries.
Command Sequence and Synchronization
Summary of Contents for SMBV100A
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