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2600S-901-01 Rev. C / January 2008
Return to
10-15
Series 2600 System SourceMeter® Instruments Reference Manual
Section 10: Digital I/O and Triggering
Hardware trigger modes
Use the hardware trigger modes to integrate Keithley Instruments and non-Keithley instruments
into an efficient test system. The hardware synchronization lines are classic trigger lines. The
Series 2600 contains 14 digital I/O lines and three TSP-Link synchronization lines that you can use
for input or output triggering.
provides a summary for each hardware trigger mode.
Table 10-5
Hardware trigger mode summary
Trigger mode
Output
Input
Notes
Unasserted
Asserted
Detects
Bypass
N/A
N/A
N/A
Use the
writebit
and
writeport
commands for direct
line control (Version 1.4.0 and
higher).
Either Edge
High
Low
Either
Short input pulses can cause a
trigger overrun.
Falling Edge
High
Low
Falling
Rising Edge
N/A
N/A
N/A
Rising A
High
Low
Rising
RisingM
Low
High
None
Synchronous
High
latching
Low
Falling
SynchronousA
High
latching
High
Falling
Ignores the pulse duration.
SynchronousM
High
Low
Rising
Each trigger mode controls the input trigger detection and output trigger generation. The input
detector monitors for and detects all edges, even if the node that generates the output trigger
causes the edge.
A trigger overrun generates if an input trigger is received before the previous input trigger
processes. To determine if a trigger overrun has occurred, reference the trigger overrun attributes.
For additional information on the hardware trigger modes,
see “Instrument Control Library” on
page 12-1 for more information.
• The programmed state of the line
determines if the behavior is
similar to RisingA or RisingM
•High similar to RisingA
•Low similar to RisingM
• Behaves similar to
SynchronousA
• Trigger overrun detection is
disabled
• To mirror the SynchronousA
trigger mode, set the pulse
duration to 1µs or any small
nonzero value