Name: Keithley 2002
Brand: Keithley
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IEEE-488 Reference

3-21

Output Triggers — In Arm Layers 1 and 2, the output

triggers are enabled only if their respective source bypasses

are also enabled. If a TLINk control source is selected, the

output trigger pulse is available on the selected TRIGGER

LINK output line. For all other control source selections, the

trigger pulse is available at the METER COMPLETE

connector.

In the Trigger Layer, the output trigger is always enabled and

occurs after every device action. If the control source is set

for EXTernal, IMMediate, MANual, BUS or TIMer, the out-

put trigger pulse is available at the METER COMPLETE

connector. If the TLINk control source is selected, output

trigger action occurs on the selected TRIGGER LINK output

line as follows:

• If the asynchronous Trigger Link mode is selected, the

output trigger pulse is available on the programmed

output line.

• If the semi-synchronous Trigger Link mode is selected

and the source bypass is disabled (:trig:tcon:dir acc),

the Trigger Link line is released (goes high).

• If the semi-synchronous Trigger Link mode is selected

and the Source Bypass is enabled (:trig:tcon:dir sour),

the Trigger Link line is pulled down low and then

released.

Counters — All three layers use programmable counters

which allow operation to return to or stay in the respective

layer. For example, programming the Trigger Layer counter

for inﬁnity (:trig:coun inf) keeps operation in the Trigger

Layer. After each device action and subsequent output trig-

ger, operation loops back to the Trigger Layer control source.

A counter resets when operation loops back to a higher layer

(or idle).

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