Many commercial aircraft use the ARINC 429 standard developed in 1977 for safety-critical applications. ARINC 429 utilizes a unidirectional bus with a single transmitter and up to twenty receivers.
It includes eight Generic I/O pins, that can be used as RS-485/RS-422, ARINC-429 (2 transmit and 2 receive channels) or eight avionics I/O ports. The board also includes eight digital I/Os and IRIG-B ...