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you can track it here
5V MAX485 TTL To RS485 Converter Module Board for Arduino High Quality
Download Address : http: //pan.baidu.com/share/link shareid = 459281 \u0026 uk = 2302102993? The above information only and does not provide technical support will be used to buy . 1. On-board MAX485 chip for RS-485 is a low-power communications. Slew-Rate Transceiver 2. Onboard then 5.08 (mm) pitch 2P terminal, convenient RS-485 communication wiring 3. The chip all pins have been drawn , you can control the operation of the microcontroller 4. Working voltage: 5V 5. The board size : 46 (mm) x12 (mm)