Features 【Excellent Performance】 This converter module fully considers the 485 bus lightning protection design and anti-interference design, high EMC and high-performance EMI; 【Easy to use】 The converter module uses standard 2.54 pitch pin headers to facilitate your secondary development. 【Powerful Function】 The RS485 converter module supports multi-machine communication, and the same network can connect at least 40 nodes. 【High-Quality Materials】 The RS485 converter module adopts high-quality chips, industrial design, and strong anti-interference ability; 【Widely Compatible】This converter module is compatible with 3.3V and 5.0V signals and can be matched with the module. Features: This module give full consideration to the 485 bus lightning protection design and anti-interference design, high EMC and high performance of EMI; For outdoor long-distance transmission, the earth end of module is connected to the earth, that can have very good anti-interference and lightning protection, making the 485 bus more security;For indoor short-distance transmission, the earth end can be disconnected from earth. Anti-interference type wiring and copper laying method prevent signal interference. Compatible with 3.3 V and 5.0 V signal, can match with module. With high performance of EMC and EMI. Using imported chip, industrial design, with strong anti-interference ability; using powerful 485 lightning protection design that can be used in industrial field and harsh environment; within the temperature of 40 ℃ to + 85 ℃, the transmission distance can be up to 1km (tested with 850m 2*1.5 cable, it is suggested to use within 800 meters; please add repeater if more than 800 meters). With insulated wire and terminals, very convenient to use. Designed with RXD, TXD signal indicator lights for easy checking of sending and receiving status. Specification: Wide voltage power supply: 3.0V ~ 30V        Limiting voltage: 33 V( it is recommended to use within 30 V, the minimum voltage should be higher than 2.8 V) Size: 52 * 23 * 11mm / 2 * 0.9 * 0.4in Package list: 1 * Module 1 set * Cable Package List