Agilent Technologies Agilent 86120C FNIdentity function, Errmngmt subroutine, Cmdopc subroutine

Programming

Example Programs

The Err_mngmt subroutine is used to actually read the value of the event status register. Examples 1 through 5 call this subroutine.

FNIdentity function

When this function is called, it resets the instrument and queries the instrument’s identification string which is displayed on the computer’s screen by the calling function. To accomplish this task, the FNIdentity function uses the *RST, *OPC?, and *IDN? common commands. This function is called from Examples 1 through 5.

Err_mngmt subroutine

This subroutine checks to make sure that no errors have set bits in the event status register and that there are no errors in the queue. Exiting this subroutine is only possible if no errors have occurred. Notice that the logic test in the subroutine tests for the same event status register bits enabled by the Set_ese subroutine: BIT(Cme,5), BIT(Cme,4), BIT(Cme,2).

This subroutine is called in Examples 1 through 5. However, it is mod- ified in Examples 3, 4, and 5 to allow it to indicate the last program- ming command that was sent to the instrument before an error occurred. This is accomplished by adding an optional argument string.

Cmd_opc subroutine

The Cmd_opc subroutine, found in Examples 3, 4, and 5, pauses the program until a non- sequential command has finished executing on the Agilent 86120C. It uses the *OPC? query.

For more information on non- sequential commands, refer to “Always force the Agilent 86120C to wait for non- sequential commands” on page 3- 12.

Tempo subroutine

This subroutine, which is only found in Example 3, pauses the pro- gram for a few seconds while the Agilent 86120C measures the drift on a laser. The argument in the example sets the pause for 10 seconds.

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