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3-29
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.