Keithley 2601B Reference Manual page 168

Series 2600B System SourceMeter® Instrument Reference Manual Section 3: Functions and features
You can obtain very precise timing and synchronization between channels of multiple instruments
using the trigger model to control the actions of the source-measure unit (SMU). To achieve such
precise timing, use a static trigger configuration. When a static trigger configuration is not possible,
you can use the interactive triggering method to control the timing and actions of the SMU.
Both programming methods use trigger objects. Trigger objects generate and monitor trigger events.
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External triggers are possible using digital I/O, TSP-Link synchronization lines, LAN, command
interface, and the manual trigger (the TRIG key).
The following figure graphically represents all the trigger objects of the Series 2600B instrument.
Figure 62: Triggering overview
2600BS-901-01 Rev. B / May 2013 3-33