BNC 725 - Manual (Page 28)

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Passive Mode (Output = Input)
In passive mode, the output signal equals the input signal or its logical inverse.
The front panel LED for the channel will glow green when the output is Low or red when the
output is high.
To try passive mode: On Channel A’s Settings screen, select the Output=Input timing mode. In
the Function box, choose Output=Input, then Click Apply to save the settings.
When the external trigger button is not depressed (i.e., the input signal is low), the signal at
Output A will be a TTL low. Now, depress the trigger button at Input 1—the signal at Output A
will go high. If you select Output=!Input (invert), the channel output will remain high until you
depress the trigger.