Programming the Digital Port
Bi-Directional Digital I/O
Digital Input only
Expression Output
External Trigger I/O
Fault Output
Inhibit Input
Fault/Inhibit System Protection
Output Couple
Digital Control Port
A Digital Control Port consisting of seven I/O pins is provided to access various control functions. Each
pin is user-configurable. The following control functions are available for the I/O pins. See SCPI
Programming Reference for details on the SCPI commands to program the Digital Port.
The following table describes the possible pin configuration for the digital port functions. For a
complete description of the electrical characteristics of the digital control port, refer to the
Specifications section.
Function Description
DIO General-purpose ground-referenced digital input/output function. The output can
be set with [SOURce:]DIGital:OUTPut:DATA.
DINPut Digital input-only mode. The digital output data of the pin is ignored.
EXPRession<1-8> A user-defined expression drives the pin.
FAULt Applies only to pin 1. Pin 1 functions as an isolated fault output. The fault signal is
true when any output is in a protected state. Pin 2 serves as the isolated common
for pin 1. When pin 1 is set to the FAULt function, the instrument ignores any
commands to program pin 2. Queries of pin 2 will return FAULt. If pin 1 is
changed from FAULt to another function, pin 2 is set to DINPut.
INHibit Applies only to pin 3. When pin 3 is configured as an inhibit input; a true signal at
the pin will disable the output.
ONCouple Applies only to pins 4-7. The ONCouple pin synchronizes the output On state
between instruments. Only one pin can be configured as an ONCouple. The pin
functions as both an input and an output.
OFFCouple Applies only to pins 4-7. The OFFCouple pin synchronizes the output Off state
between instruments. Only one pin can be configured as an OFFCouple. The pin
functions as both an input and an output.
Keysight N6900/N7900 Series Operating and Service Guide 151
4 Using the Advanced Power System
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