VCC: + 3.3V
TXD : The module's TTL (UART) to send, connected to the microcontroller's RXD receiver pin;
RXD : The module's TTL (UART) receiver, connected to the microcontroller TXD send pin;
GND : The module ground wire (this wire must be connected with the ground wire of microcontroller system);
Module 5P Terminal side:
R + / A : A-Pin of this module, connected to T + / Y pin of other 422 modules;
R- / B : B-Pin of this module, connected to T- / Z pin of other 422 modules;
T- / Z -: Z-Pin of this module, connected to R- / B of other 422 modules;
T + / Y : Y-Pin of this module, connected to R + / A pin of other 422 modules;