Module description: This product through a high-end isolation chip to achieve TTL, RS485 on both sides of the power and signal perfect isolation, anti-interference ability. The power supply is a wide voltage input (3.0V-5.5V), which enables perfect compatibility between 3.3v system and 5.0V system. 3.3V or 5.0v communication signals can be matched. This parent mission module realized TTL signal and RS485 signal mutual fer, but we must know 485 This communication mode can realize two-way communication, but cannot be carried out in both directions at the same time. It must be carried out alternately, that is to say, each end of the communication channel can be the sending end or the receiving end, but at the same time, information can only have one mission direction. Realize the automatic flow control of RS485 signal and automatic switch of sending and receiving direction. Using this module is as simple as your operation of serial port. This module fully considers the 485 bus lightning protection design and anti-interference design The use of isolation chip, realize the isolation of power and signal, with isolation and bus protection functions extremely high EMC(electromagnetic compatibility), EMI(electromagnetic anti-interference) performance, in the field of foreign distance mission, the "ground" end of the module into the earth, It can play a very good role of anti-interference and lightning-protection, so that the 485 bus is safer, indoor short distance mission can not access the earth. The standard 2.54 spacing design, convenient for your secondary development. with 120 euro matching resistance, short connection Ro can enable matching resistance, long distance mission recommended short connection. Support multi-machine communication, the same network can be connected to at least 128 nodes. Can be hot swap, willnot appear the phenomenon of signal plug.anti-interference type wiring and copper paving mode, to prevent signal interference.<