HP E1418A manual Using *OPC?

Using *OPC?

As shown, the examples have made no attempt to coordinate the program execution with the HP E1418A module. In some cases, you may need to pause program execution until the module has completed executing the commands.

The IEEE-488 common command *OPC? can be used to keep the program and the module synchronized. The *OPC? query returns a 1 when all programmed operations are complete. The program can wait for the response before executing additional statements. The returned value is unimportant (always a 1).

/* Set channel 1 voltage mode */

SOURce1:FUNCtion:MODE VOLTage

/* Set channel 1 voltage output */

SOURce1:VOLTage 5.000

/* Turn on the output */

OUTPut1 ON

*OPC?

/* enter the response */

*OPC? is used to synchronize the program with the module since program execution waits for the response. The command may be combined using the ; as described under “ Linking Commands” on page 62. For example,

/* Set channel 1 voltage mode */

SOURce1:FUNCtion:MODE VOLTage;*OPC?

/* enter the response */

56 Programming Examples Chapter 2