The ARINC 429 Tx IP Core implements a transmitter as specified in the ARINC Specification 429 Part 1-17.
This “Mark 33 Digital Information Transfer System (DITS)” specification defines how to transfer digital data between avionics systems elements. The transmission is done over a twisted and shielded pair of wires and bi-directional data flow is not permitted. An extra twisted and shielded pair of wires is used when data is required to flow both ways.