Product Features: This module fully considered485BusLightning protection designAnti interference Design When the long-distance transmission in the field, the "Earth" of the module is connected to the earth, which can play a very good role in anti interference and lightning protection.485Bus is more secure; indoor short distance transmission can not access the earth. Have 120Ou matching resistance, short connectR0Can match the resistance, long distance transmission is recommended. Support multi machine communication, allowing access to the most 128A device on the bus This module can be hot plug, no other 485Chip hot swap signal plug phenomenon Large area laying copper, preventing signal interference Packaging includes 5* TTL to RS485 485 to Serial UART Adapter