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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)