Keysight E36731A Manuel D'instructions page 45

Digital port connections
A 4-pin connector is provided on each instrument to access the three digital control port functions. The digital
control connector accepts wire sizes from AWG 16 to AWG 22.
It is good engineering practice to twist and shield all signal wires to and from the digital connectors. If shielded
wire is used, connect only one end of the shield to the chassis ground to prevent ground loops.
The wire connection to the digital port is not recommended to be longer than 3 meters.
Pin functions
The following table describes the possible pin configuration for the digital port functions. For a complete description
of the electrical characteristics of the digital I/O port, refer to the product data sheet.
Pin function
Digital I/O and Digital In
External Trigger In/Out
Fault Out
Relay
Inhibit In
Output Coupling
Common
In addition to the configurable pin functions, the active signal polarity for each pin is also configurable. When
Positive polarity is selected, a logical true signal is a voltage high at the pin. When Negative polarity is selected, a
logical true signal is a voltage low at the pin.
For more information on configuring the digital port functions, refer to
Keysight E36731A User's Guide
Available configurable pins
Pins 1 through 3
Pins 1 through 3
Pin 1 and Pin 2
Pin 1
Pin 3
Pins 1 through 3
Pin 4
Using the Digital Control Port.
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