what is the difference between modbus rtu and tcp?
The most basic difference between MODBUS RTU and MODBUS TCP/IP is that MODBUS TCP/IP runs on an Ethernet physical layer, and Modbus RTU is a serial level protocol. Modbus TCP/IP also uses a 6-byte header to allow routing. ... Modbus TCP/IP is simply the Modbus RTU protocol with a TCP interface that runs on Ethernet.