PCM self-test module based on RS422 interface

In order to test PCM signal output from the acquisition module, a PCM self-test module based on RS422 interface is designed. The design of PCM simulation signal source and PCM decoding receiver module is to test the correctness of its output and reception. The connection between the transceiver module using RS422 interface. Decoded data transfer to PC by USB interface and check PCM self-test module working situation.