Agilent Technologies N6700 manual Digital Input, External Trigger

Appendix B Using the Digital Port

Digital Input

Each of the seven pins can be configured as digital input only. The polarity of the pins can also be configured. Pin 8 is the signal common for the digital input pins. The pin status reflects the true condition of the external signal that is applied to the pin. The pin state is not affected by the value of the digital output word.

To configure the pins for digital input only:

Front Panel:	SCPI Command:
Select System\IO\DigPort\Pin<n>,	To configure the pin function:
where <n> is the pin number.	DIG:PIN<1-7>:FUNC DINP
Select Function, then Digital In.	To configure pin polarity:
Go back one level, select Polarity,	DIG:PIN<1-7>:POL <pol>
	To read the pin data:
then either Positive or Negative.
To read the data from the pins, select	DIG:INP:DATA?
System\IO\DigPort\Data.
The input data is displayed as a binary
number in the Data In field.

External Trigger

Each of the seven pins can be configured as either 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.

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 trigger pulse in response to a trigger event. Depending on the polarity setting, it can be either positive- going or negative-going when referenced to common.

Front Panel:	SCPI Command:
Select System\IO\DigPort\Pin<n>,	To select the trigger output
where <n> is the pin number.	function for pin 1:
Select Function, then either	DIG:PIN1:FUNC TOUT
Trigger In or Trigger Out.	To select the trigger input function
Go back one level, select Polarity,	for pin 2:
	DIG:PIN2:FUNC TINP
then either Positive or Negative.
	To select the trigger polarity:
	DIG:PIN<1-7>:POL <pol>

92 Series N6700 User’s Guide