MODBUS/TCP is the protocol that implements serial Modbus communication over Ethernet networks. It encapsulates traditional Modbus messages into TCP/IP packets, enabling communication over Ethernet. Modbus/TCP uses port 502 as its default TCP port.
Modbus TCP/IP: This is an Ethernet-based version of Modbus, often referred to as Modbus/TCP. It encapsulates Modbus frames within TCP/IP packets, allowing for communication over Ethernet networks.
Source: https://www.drivesandcontrols.ca/latest-articles/modbus-communication/
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