External Trigger I/O
Each of the seven pins can be configured as trigger inputs or trigger outputs. The polarity of the pins
can also be configured. When you program trigger polarity, POSitive means a rising edge and
NEGative means a falling edge. Pin 8 is the signal common for the trigger pins. For an overview of the
trigger system, refer to Trigger Overview.
When configured as a trigger input, you can apply either a negative-going or a positive-going pulse to
the designated trigger input pin. The trigger latency is 5 microseconds. The minimum pulse width is 4
microseconds for positive-going signals, and 10 microseconds for negative-going signals. The pin’s
polarity setting determines which edge generates a trigger-in event.
When configured as a trigger output, the designated trigger pin will generate a 10 microsecond-wide
pulse 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 Command
Select System\IO\DigPort\Pins.
Select a pin in the Pin field.
In the Function field, selecteither the Trig In or Trig Out function.
In the Polarity field, select either Positive or Negative.
To selectthe trigger output function for pin 1:
DIG:PIN1:FUNC TOUT
To selectthe trigger input function for pin 2:
DIG:PIN2:FUNC TINP
To selectthe pin polarity:
DIG:PIN1:POL POS
DIG:PIN2:POL POS
Fault Output
Pins 1 and 2 can be configured as a fault-output pair. The Fault Output function enables a fault
condition to generate a protection fault signal on the digital port. Refer to Programming Output
Protection for a list of protection signals.
Both pins 1 and 2 are dedicated to this function. Pin 1 is the Fault output; pin 2 is the common for pin 1.
This provides for an optically-isolated output. The polarity of pin 1 can also be configured. When the
pin polarity is POSitive, a fault condition causes the isolated output to conduct. Note that the Fault
output signal remains latched until the fault condition is removed and the protection circuit is cleared.
as explained under Clearing Protection Functions.
Pin 2's selected function is ignored. Pin 2 should be connected to the ground of the
external circuit.
Front Panel Menu Reference SCPI Command
Select System\IO\DigPort\Pins.
Select pin 1, then Function, then Fault Out.
In the Polarity field, select either Positive or Negative.
To configure the Fault function:
DIG:PIN1:FUNC FAUL
To selectthe pin polarity:
DIG:PIN1:POL POS
4 Using the Advanced Power System
154 Keysight N6900/N7900 Series Operating and Service Guide
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