Modbus ASCII vs Modbus RTU vs Modbus TCP/IP - The Automization
Is a special protocol converter required to connect Modbus RTU serial interface devices to an Ethernet network? Is the serial device server sufficient?
Modbus Master-Slave Principle
Anybus® Serial Server Modbus RTU-to-TCP Gateway - HMS Networks | Mouser
RTU/ASCII Slave Test Software | Simply Modbus Software