Connecting cables for Trigger Link
Use a cable equipped with a male DB-25 connector (L-com part number CSMN25MF-5) to connect
the digital I/O port to other Keithley Instruments models equipped with a Trigger Link
(TLINK) interface.
Digital I/O lines
The port provides 14 digital I/O lines. Each output is set high (+5 V) or low (0 V) and can read high or
low logic levels. Each digital I/O line is an open-drain signal.
The 2604B, 2614B, and 2634B do not have digital I/O lines.
+5 V output
The digital I/O port provides three +5 V dc output lines that you can use to drive external logic circuitry.
Maximum combined current output for all lines is 250 mA. These lines are protected by a
self-resetting fuse with a one-hour recovery time.
Output enable line
You can use the 2601B, 2602B, and 2604B output enable (OE) line of the digital I/O with a switch in
the test fixture or component handler. With proper use, power is removed from the device under test
(DUT) when the lid of the fixture is opened. See Using output enable (on page 4-42) for more details.
The digital I/O port of the Model 2601B/2602B/2604B is not suitable for control of safety
circuits and should not be used to control a safety interlock. When an interlock is required for
safety, a separate circuit should be provided that meets the requirements of the application to
reliably protect the operator from exposed voltages.
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