Keithley 2461 Reference Manual page 263

Section 3: Functions and features
Input characteristics:
•
All rising edges are input triggers.
•
When all external drives release the physical line, the rising edge is detected as an input trigger.
•
A rising edge is not detected until all external drives release the line and the line floats high.
Output characteristics:
•
In addition to trigger events from other trigger objects, the TSP commands
trigger.digout[N].assert() and trigger.tsplinkout[N].assert() generate a low
pulse that is similar to the falling-edge trigger mode.
•
An action overrun occurs if the physical line state is low when a stimulus event occurs.
Synchronous acceptor
Use the synchronous acceptor trigger mode with the synchronous master mode or its non-Keithley
equivalent.
Only one instrument should be configured as a synchronous master. All other instruments connected
to the synchronization line must be configured as synchronous acceptor or equivalent.
A line that is set to the synchronous acceptor mode detects falling edge input triggers and generates
rising edge output triggers on the same trigger line. When a line that is configured as synchronous
acceptor detects the falling edge trigger, it latches the line low and holds it in that state until all
triggered actions for that instrument are complete. When the triggered actions are complete, the
synchronous acceptor line releases the line. When all connected instruments have released the line,
the line changes state and generates a rising edge trigger.
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Model 2461 Interactive SourceMeter® Instrument Reference Manual
Figure 133: Synchronous master input trigger
Figure 134: Synchronous master output trigger
2461-901-01 A/November 2015