Digital I/O; Digital I/O Port - Keithley 2450 Reference Manual

Section 3: Functions and features

Digital I/O

You can use the Model 2450 digital input/output with the trigger model or 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 Model 2450 over a remote interface.
To use the Model 2450 digital I/O in a trigger link system (TLINK), connect it using a Model
2450-TLINK Trigger Link Cable and configure the Model 2450 digital input and output lines.
For more information the trigger model, see

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
Model 2450. You can connect to the Model 2450 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.
Model 2450 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 Vext 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 (one-hour
recovery time).
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Model 2450 Interactive SourceMeter® Instrument Reference Manual
Trigger model
Figure 91: Model 2450 digital IO port
(on page 3-95).
2450-901-01 Rev. B/September 2013