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Model 2651A High Power System SourceMeter® Instrument Reference Manual Section 3: Functions and features

2651A-901-01 Rev. A / March 2011 3-51

LXI trigger edge detection

Stateless event

flag

Hardware

value

Pseudo line state Falling edge Rising edge

0 0 0 Detected Detected

0 1 0 - Detected

0 0 1 Detected -

0 1 1 Detected Detected

1 - - Detected Detected

Set the LAN trigger mode to configure edge detection method in incoming LXI trigger packets. The

mode selected also determines the hardware value in outgoing LXI trigger packets. The following

table lists the LAN trigger modes.

LAN trigger modes

Trigger mode Input detected Output generated Notes

Either edge Either Negative

Falling edge Falling Negative

Rising edge Rising Positive

RisingA Rising Positive Same as Rising

RisingM Rising Positive Same as Rising

Synchronous Falling Positive Same as SynchronousA

SynchronousA Falling Positive

SynchronousM Rising Negative

The programming example below illustrates how to configure the LAN trigger mode:

-- Set LAN trigger 2 to have falling-edge mode.

lan.trigger[2].mode = lan.TRIG_FALLING

Understanding LXI trigger event designations

LAN trigger objects generate LXI trigger events. The LXI standard designates trigger events as LAN0

to LAN7 (zero based). In the command table, the LXI trigger events can be accessed using

lan.trigger[1] through lan.trigger[8]. lan.trigger[1] corresponds to LXI trigger event

LAN0 and lan.trigger[8] corresponds to LXI trigger event LAN7.

Generating LXI trigger packets

The Model 2651A can be configured to output an LXI trigger packet to other LXI instruments. To

generate LXI trigger packets, you must first call the lan.trigger[N].connect() function. Select

the event that triggers the outgoing LXI trigger packet by assigning the specific event ID to the LAN

stimulus input.

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