AJA FS1 Installation and Operation Guide

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The following illustration shows typical external wiring to the GPI connector.
The GPI inputs require some kind of contact closure between the input pin and
the input ground pin to register the logic low that triggers the GPI input.
You can connect the outputs to TTL buffers that communicate the GPI output
logic levels to other devices. For example, you could use an opto-isolator
controlling a relay to activate other equipment as shown below.
GPI
Input 1
GPI GND 1
GPI Output 1
Typical GPI Input and Output Connections
+V
Optical Relay (SSR)
xmit+
To Tally Lamp etc.
xmit-