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Series 2600B System SourceMeter® instrument Reference Manual Section 4: Triggering

2600BS-901-01 Rev. F/August 2021 4-25

Command interface triggering

A command interface trigger occurs when:

• A GPIB GET command is detected (GPIB only)

• A VXI-11 device_trigger method is invoked (VXI-11 only)

• A *TRG message is received

• A USBTMC TRIGGER message is received (USB only)

Use trigger.EVENT_ID to monitor for command interface triggers. To ensure that commands and

triggers issued over the command interface are processed in the correct order, a trigger event is not

generated until:

• The trigger command is executed

• trigger.wait() retrieves the trigger command from the command queue before it would

normally be executed

Command interface triggering does not generate action overruns. The triggers are processed in the

order that they are received in the 2600B command queue. The 2600B only processes incoming

commands when no commands are running. Unprocessed input triggers can cause an overflow in the

command queue. It is important to make sure a script processes triggers while it is running.

The command queue can fill up with trigger entries if too many *TRG messages are received while a

test script is running, even if the script is processing triggers. You can avoid this by using the

localnode.prompts4882 attribute (see TSP command reference (on page 9-1) for more

information), and by using trigger.wait() calls that remove the *TRG messages from the

command queue. If the command queue fills with too many trigger entries, messages like abort are

not processed.

Trigger generator

The 2600B has two trigger generators that you can use to generate trigger events. Use the

trigger.generator[N].assert()function to directly trigger events from the command interface

or a script (for example, you can trigger a sweep while the instrument is under script control).

The trigger.generator[N].EVENT_ID constant is an identification number that identifies events

generated by this generator. To have another trigger object respond to trigger events generated by

this generator, set the stimulus attribute of the other object to the value of this constant.

Tektronix KEITHLEY 2600B Series User Manual

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