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

2600BS-901-01 Rev. F/August 2021 4-23

Assigning input trigger events

Each event blender has four stimulus inputs. You can assign a different trigger event ID to each

stimulus input. The programming example below illustrates how to assign the source complete event

IDs of SMU A and SMU B to stimulus inputs 1 and 2 of event blender 1:

trigger.blender[1].stimulus[1] = smua.SOURCE_COMPLETE_EVENT_ID

trigger.blender[1].stimulus[2] = smub.SOURCE_COMPLETE_EVENT_ID

Action overruns

Action overruns are generated by event blenders depending on the mode, as shown in the following

table. Use the status model to monitor for the occurrence of action overruns. For details, see Status

model (on page 12-1).

Action overruns

Mode

Action overrun

And

Generates an overrun when a second event on any of its inputs is detected

before generating an output event.

Generates an overrun when two events are detected simultaneously.

LAN triggering overview

Triggers can be sent and received over the LAN interface. The 2600B supports LAN extensions for

instrumentation (LXI) and has eight LAN triggers that generate and respond to LXI trigger packets.

Understanding hardware value and pseudo line state

LAN triggering is similar to hardware synchronization except that LXI trigger packets are used instead

of hardware signals. A bit in the LXI trigger packet called the hardware value simulates the state of a

hardware trigger line. The 2600B stores the hardware value of the last LXI trigger packet that was

sent or received as the pseudo line state.

The stateless event flag is a bit in the LXI trigger packet that indicates if the hardware value should be

ignored. If it is set, the 2600B ignores the hardware value of the packet and generates a trigger event.

The 2600B always sets the stateless flag for outgoing LXI trigger packets. If the stateless event flag is

not set, the hardware value indicates the state of the signal.

Changes in the hardware value of consecutive LXI trigger packets are interpreted as edge transitions.

Edge transitions generate trigger events. If the hardware value does not change between successive

LXI trigger packets, the 2600B assumes an edge transition was missed and generates a trigger event.

The following table illustrates edge detection in LAN triggering.

Tektronix KEITHLEY 2600B Series User Manual

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