1 on-board MAX485 chip , is a tool for RS-485 communications , low-power , Slew-Rate Transceiver
2 onboard then 5.08 (mm) pitch 2P terminal for easy wiring RS-485 communication
3 the chip has drawn all of the pins can be controlled by the microcontroller operation
4 Working voltage : 5V
5 board size : 44 (mm) x14 (mm)