This is an Arduino library which allows you send and receive data using RS-485 protocol. With RS232 to RS485 chip you can communicate with every RS485 device. The library supports all KMP Electronics boards which includes RS485 and every Arduino RS485 device with a similar pin mapping.

For simplicity we used only one pin for manipulation RE and DE pins we name it Transmission Enable pin. Pin mapping:

We have been using this library together with our devices:

• PRODINo WIFI-ESP WROOM-02
• PRODINo MKR Zero
• PRODINo ESP32

Open Arduino IDE. From menu selects Sketch -> Include Library -> Manage libraries. In Library Manager searches for "KMP_RS485" and install the library.

With this library we provide following examples:

• Echo. The example presets using this device as a RS-485 repeater. When the device received the data then collected it and transmit it back.
• Transmitter. The example presets using this device as a RS-485 transmitter. When we sent some information with Serial port the program read it and send data to RS-485.
• Receiver. The example presets using this device as a RS-485 receiver. When the device receive data from RS-485 it gets it and print on Serial port.

KMP Electronics invests time and resources providing this open source code, please support KMP Electronics and open-source hardware by purchasing products from KMP Electronics!

This project is licensed under the MIT License, see LICENSE for further information.