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Model 2450

Interactive SourceMeter® Instrument Reference Manual Section 3:

Functions and features

2450-901-01 Rev. B/September 2013 3-111

Trigger events

Event description Event constant

No trigger event

trigger.EVENT_NONE

Trigger timer N (1 to 4) expired

trigger.EVENT_TIMERN

Source limit condition occurs

trigger.EVENT_SOURCE_LIMIT

Using the TRIGGER key to generate an event

You can use the front-panel TRIGGER key to generate a trigger event.

To set a trigger block to respond to the front-panel key press, in SCPI, set the event to DISPlay. In

TSP, set the event to trigger.EVENT_DISPLAY.

For example, if you set a wait block to advance when the TRIGGER key is pressed, the trigger model

will reach the wait block. If the TRIGGER key has already been pressed, the trigger model execution

will continue. If the TRIGGER key has not been pressed, the trigger model execution is halted until

the TRIGGER key is pressed.

There are no action overruns for front-panel TRIGGER key events.

Using the notify block event

When the trigger model reaches a notify block, the instrument generates a trigger event and

immediately continues to the next block.

You can define up to eight notify blocks in a trigger model. You can reference the event that the notify

block generates by other commands to assign a stimulus somewhere else in the system. For

example, you can use the notify event as the stimulus of a hardware trigger line, such as a digital I/O

line.

When the trigger model executes a notify block, the instrument generates the SCPI event

NOTify<n> or TSP event trigger.EVENT_NOTIFYN. You can assign this event to a command that

takes an event. There can be up to eight notify blocks in a trigger model.

For example, if you want a Notify block to trigger a digital I/O line, insert a Notify block into the trigger

model, assign it a notify event and then connect it to the stimulus of the digital I/O line to drive.

For example, to set notify block 5 to be a stimulus for digital output line 2, you would send the

following commands in SCPI:

TRIG:BLOC:NOT 5, 2

:TRIG:DIG3:OUT:STIMulus NOTify2

In TSP, you would send the commands:

trigger.model.setblock(5, trigger.BLOCK_NOTIFY, trigger.EVENT_NOTIFY2)

trigger.digout[3].stimulus = trigger.EVENT_NOTIFY2

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