2606B System SourceMeter® Instrument Reference Manual
Section 3: Functions and features
2606B-901-01 Rev. B / May 2018
3-79
The output enable (OE) line of the digital I/O can be used with a switch in the test fixture or
component handler. With proper use, power is removed from the DUT when the lid of the fixture is
opened. See
(on page 3-81) for more details.
The digital I/O port of the 2606B 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.
If you are using other Keithley Instrument models that are equipment with a Trigger Link (TLINK), use
a cable equipped with a male DB-25 connector (Keithley Instruments part number CA-126-1), or a
Model 2600-TLINK cable to connect the digital I/O port to the other equipment.
Digital I/O configuration
The following figure shows the basic configuration of the digital I/O port. Writing a 1 to a line sets that
line high (~ +5 V). Writing a 0 to a line sets that line low (~0 V). Note that an external device pulls an
I/O line low by shorting it to ground, so that a device must be able to sink at least 960
µ
A per I/O line.
Figure 75: Digital I/O interface schematic