Arduino-based Modbus RTU to Modbus TCP/UDP gateway with web interface

technical specifications

• slaves are connected via RS485 interface
• master(s) are connected via ethernet interface
• up to 247 Modbus RTU slaves
• up to 8 TCP/UDP sockets for Modbus TCP/UDP masters and for the web interface
• RS485 interface protocols:
  • Modbus RTU
• Ethernet interface protocols:
  • Modbus TCP
  • Modbus UDP
  • Modbus RTU over TCP
  • Modbus RTU over UDP
• supports broadcast (slave address 0x00) and error codes
• supports all Modbus function codes
• settings can be changed via web interface, stored in EEPROM
• diagnostics and Modbus RTU scan via web interface
• optimized queue for Modbus requests
  • prioritization of requests to responding slaves
  • queue will accept only one requests to non-responding slaves

https://github.com/budulinek/arduino-modbus-rtu-tcp-gateway