Digital I/O - Tektronix KEITHLEY SourceMeter 2606B Reference Manual

Model 2606B System SourceMeter® Instrument Reference Manual

Digital I/O

The 2606B has a digital input/output port on each module that can be used to control external digital
circuitry. For example, you can use a handler that performs binning operations with a digital I/O port.
Port configuration
The digital I/O port, a standard DB-25 socket connector (shown below), is on the front panel.
For a schematic diagram of the digital I/O hardware, refer to the Model 2606B Specifications on the
Keithley Instruments support website
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 +5 V dc output can be used 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 an hour recovery time.
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
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 (L-com part number CSMN25MF-5) to connect the
digital I/O port to the other equipment.
2606B-901-01 Rev. C November 2021
Figure 82: Digital I/O port
(tek.com/support).
Using output enable (on page 7-40) for more details.
Section 7: Triggering
7-37