Lan Triggering Overview - Keithley DMM7510 Reference Manual

7 1/2 digit graphical sampling multimeter

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Model DMM7510 7½ Digit Graphical Sampling Multimeter Reference Manual

LAN triggering overview

You can send and receive triggers over the LAN interface. The Model DMM7510 supports LAN

extensions for instrumentation (LXI). It has eight LAN triggers that generate and respond to LXI

trigger packets.

Understanding hardware value and pseudo line state

LAN triggering and hardware synchronization are similar, except that LAN triggering uses LXI trigger

packets instead of hardware signals. A bit in the LXI trigger packet called the hardware value

simulates the state of a hardware trigger line. The Model DMM7510 stores the hardware value as the

pseudo-line state. Only the state of the last LXI trigger packet that was sent or received is stored.

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 Model DMM7510 ignores the hardware value of the packet and generates a

trigger event. The Model DMM7510 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.

The instrument interprets changes in the hardware value of consecutive LXI trigger packets as edge

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

successive LXI trigger packets, the Model DMM7510 assumes an edge transition was missed and

generates a trigger event. The following table shows edge detection in LAN triggering.

LXI trigger edge detection

Stateless event

You can set the LAN trigger edge detection method in incoming LXI trigger packets. The edge that is

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

the LAN trigger edges.

Trigger mode

Falling edge

LAN trigger objects generate LXI trigger events. LAN trigger objects generate LXI trigger events,

which are LAN0 to LAN7 (zero based). To specify the LAN trigger event in a command, use LANN,

where N is 1 to 8. LAN1 corresponds to LXI trigger event LAN0 and LAN8 corresponds to LXI trigger

event LAN7. To specify the LAN trigger event in a command, see

DMM7510-901-01 Rev. B / May 2015

Input detected

Output generated

Falling edge

Trigger events

Section 3: Functions and features

(on page 3-99).