MOTIONCROSS is a smart gate which can receive 4 trigger signals (TTL High, TTL Low, Switch N.O, Switch N.C) in any input channel, and generates 4 synced TTL output signals with a delay of less than 100ns from the "first to arrive" input signal

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Within power-on, the device will learn the current input status and any change will generate a trigger.

if you wish the device to re-learn the inputs, just reset the power.