A library that allows your Arduino to communicate via Modbus protocol, acting as a slave (master in development). Supports serial (RS-232, RS-485) and IP via Ethernet (Modbus IP).
BSD 3-Clause "New" or "Revised" License
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Hi. Is this library can be used as read the register values from RTU through the router? #3
Yes, modbusIP library, you can use standard Ethernet Shileld, ENC28J60 shield or a ESP8266 as network interface.