Digital InputEach of the seven pins can be configured as digital input only. The polarity of the pins can also beconfigured. Pin 8 is the signal common for the digital input pins. The pin status reflects the truecondition of the external signal that is applied to the pin. The pin state is not affected by the setting ofDIGital:OUTPut:DATA. To configure the pins for digital input only:Front Panel Menu Reference SCPI CommandSelect System\IO\DigPort\Pins.Select a pin in the Pin field.In the Function field, select Dig In.In the Polarity field, select either Positive or Negative.To read the data from the pins, selectSystem\IO\DigPort\Data.The input data is displayed as a binary number in theData In field.To select the pin function:DIG:PIN<1-7>:FUNC DINPTo select the pin polarity:DIG:PIN<1-7>:POL POSTo read the data on the pins:DIG:INP:DATA?External Trigger I/OEach of the seven pins can be configured as trigger inputs or trigger outputs. The polarity of the pinscan also be configured. When you program trigger polarity, POSitive means a rising edge andNEGative means a falling edge. Pin 8 is the signal common for the trigger pins. For an overview of thetrigger system, refer to Trigger Overview.When configured as a trigger input, you can apply either a negative-going or a positive-going pulse tothe designated trigger input pin. The trigger latency is 5 microseconds. The minimum pulse width is 4microseconds for positive-going signals, and 10 microseconds for negative-going signals. The pin’spolarity setting determines which edge generates a trigger-in event.When configured as a trigger output, the designated trigger pin will generate a 10 microsecond-widepulse when a Trigger Out occurs. Depending on the polarity setting, it can be either positive-going(rising edge) or negative-going (falling-edge) when referenced to common.Front Panel Menu Reference SCPI CommandSelect System\IO\DigPort\Pins.Select a pin in the Pin field.In the Function field, select either the Trig In or Trig Outfunction.In the Polarity field, select either Positive or Negative.To select the trigger output function for pin 1:DIG:PIN1:FUNC TOUTTo select the trigger input function for pin 2:DIG:PIN2:FUNC TINPTo select the pin polarity:DIG:PIN1:POL POSDIG:PIN2:POL POSKeysight RP7900 Series Operating and Service Guide 1574 Using the Regenerative Power System
