Tektronix Keithley 2281 Series, Reference Manual

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Section 3: Functions and features Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual
3-22 077114601 / March 2019
Digital I/O
You can use the 2281S digital input/output with the trigger model to control an external digital circuit,
such as a device handler that is used to perform binning operations.
To control or configure any of the six digital input/output lines, send commands to the 2281S over a
remote interface.
The following topics contain more information about the digital input/output port. For more information
the trigger model, see Trigger model (on page 3-30).
Digital I/O port
The digital I/O port uses a standard female DB-9 connector, which is located on the rear panel of the
2281S. You can connect to the 2281S digital I/O using a standard male DB-9 connector. The port
provides a connection point to each of the six digital I/O lines and other connections as shown in the
following table.
Figure 78: Digital I/O port
2281S digital I/O port pinouts
Pin Description
1 I/O line 1
2 I/O line 2
3 I/O line 3
4 I/O line 4
5 V
ext
line (relay flyback diode protection)
6 I/O line 5
7* +5 V line
8 I/O line 6
9 Ground
* Use this pin to drive external logic circuitry. Maximum current output is 500 mA. This line is protected by a
self-resetting fuse.