In addition to the configurable pin functions, the signal polarity (Positive or Negative) for each pin is
also configurable. For level signals, POSitive indicates a voltage high at the pin. NEGative indicates a
voltage low at the pin. For edge signals, POSitive means a rising edge and NEGative means a falling
edge.
Bi-Directional Digital I/O
Each of the seven pins can be configured as general purpose bi-directional digital inputs and outputs.
The polarity of the pins can also be configured. Pin 8 is the signal common for the digital I/O pins. Data
is programmed according to the following bit assignments:
Pin 7 6 5 4 3 2 1
BitWeight 6 (MSB) 5 4 3 2 1 0 (LSB)
The digital I/O pin can be used to control both relay circuits as well as digital interface circuits. The
following figure illustrates typical relay circuits as well as digital interface circuit connections using the
digital I/O functions
To configure the pins for digital I/O:
Front Panel Menu Reference SCPI Command
Select System\IO\DigPort\Pins.
Select a pin in the Pin field.
In the Function field, select Dig IO.
In the Polarity field, select either Positive or Negative.
To send data to the pins, select
System\IO\DigPort\Data.
Select the Data Out field and enter the binary word.
To select the pin function:
DIG:PIN<1-7>:FUNC DIO
To select the pin polarity:
DIG:PIN<1-7>:POL POS
To configure pins 1 through 7 as “0000111”:
DIG:OUTP:DATA 7
4 Using the Regenerative Power System
156 Keysight RP7900 Series Operating and Service Guide
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