Using The Operation Complete Commands; Summary Of Commands - Keysight 8990B Programming Manual

Using the Operation Complete Commands

The *OPC? query and
between the PC and the 8990B. The *OPC? query places an ASCII character 1 into
the 8990B output queue when all pending 8990B commands have completed. If
your program reads this response before continuing program execution, you can
ensure synchronization between one or more instruments and the PC.
The *OPC command sets bit 0 (Operation Complete) in the Standard Event Status
register when all pending 8990B operations have completed.
Procedure
1 Send a device clear message to clear the 8990B output buffer.
2 Clear the event registers with the *CLS (clear status) command.
3 Enable Operation Complete using the *ESE 1 command (Standard Event
4 Send the *OPC? query and enter the result to assure synchronization.
5 Send your programming command string, and place the *OPC command as the
6 Send the *STB? (status byte) query to poll the register. This command does not

Summary of Commands

For details of each SCPI command available to program the 8990B, refer to later
chapters for more details on each command.
Keysight 8990B Programming Guide
*OPC
register).
last command.
clear the Status Byte summary register.
command allow you to maintain synchronization
8990B Remote Operation 1
45