We use modbus & modbus/ip in our products here.  For IP, you need both an
ip addr/port AND the modbus slave address.  Each device can have
240-something addresses.  Think of an IP to RS485 bridge (moxa and others
make them).  I can talk to any of the slave devices by their modbus address
though one (the bridge's) IP addr/port.

Modbus/IP is just a wrapper for a RS232/485 modbus packet.

Stephen
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