5/25/2023 0 Comments Arduino modbus rtu rs485![]() The TCP version of Modbus follows the OSI Network Reference Model. ![]() Checksum and error handling are handled by Ethernet in the case of Modbus TCP. The checksum field normally found at the end of an RTU packet is omitted from the TCP packet. As we said before, the standard port for Modbus TCP is 502, but the port number can often be reassigned if you wish. The most important address here is the IP address. The unit number is still included and its interpretation varies by application - the unit or slave address is not the primary means of addressing in TCP. ![]() ![]() Modbus TCP encapsulates Modbus RTU request and response data packets in a TCP packet transmitted over standard Ethernet networks.
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