The RS232/485/422 communication module designed for industrial field applications. It include one RS232 interface, two RS485 and two RS422 communication interfaces. Cooperate with the FPGA development board to realize remote data transmission and communication of RS232, 485 and 422. RS232 Interface * One-channel standard DB9 serial interface * Max3232 to convert between RS232 and TTL (Transistor-Transistor Logic) level signals * Transfer speed up to 120kbps RS485 Interface * 2-channel RS484, connected with 3 wire terminals * Max3485 to convert between RS485 and TTL (Transistor-Transistor Logic) level signals * Industrial design, Strong anti-interference ability, and effective lightning protection * Support multi machine communication, Max. allowed 128 devices in bus * Transfer speed up to 500kbps RS422 Interface * 2-channel RS422, connected with 5 wire terminals * Max3490 to convert between RS422 and TTL (Transistor-Transistor Logic) level signals * Industrial design, Strong anti-interference ability, and effective lightning protection * Support multi machine communication, Max. allowed 128 devices in bus * Transfer speed up to 500kbps