Operating temperature:-40?~+ 85?. Size :42mm×15mm(1.65"x0.59'') The design adopts half-hole technology;thickness :0.8mm; Pitch: Standard 2.54mm pitch design With 120Ou matching resistance, short connection can match resistance(it is recommended for long distance transmission.) The module supports hot swap,and the signal will not crash. Strong anti-interference ability; With RXD, TXD signal indicator; This communication method can realize two-way communication, but can not simultaneously communicate in two directions. The package includes: 7x TTL to RS485 module

Note: Recommended for use within 800 meters;over 800 meters,add a repeater please. Multi-machine communication:Supports multi-machine communication,allowing access to up to 128 devices on the bus. Signal indicator:With RXD,TXD signal indicator,easy to monitor the sending and receiving status. Feature:Large area laid copper wire,which can prevent signal interference and has stable performance. Compatibility:3.3V and 5.0V power supplies are compatible;3.3V and 5.0V signals are compatible.