GPIO Pin to Digital I/O Module Mapping
For communication between a Raspberry Pi and Opto 22 digital I/O modules, the Digital I/O Carrier Board for Raspberry Pi maps 16 GPIO pins to 16 I/O modules.
To read or write to an I/O module, reference the GPIO pin number in your code.
Mapping for a G4 Rack
Mapping for a SNAP Rack
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