![]() ![]() Modbus over UDP â Some have experimented with using Modbus over UDP on IP networks, which removes the overheads required for TCP.Modbus over TCP/IP or Modbus over TCP or Modbus RTU/IP â This is a Modbus variant that differs from Modbus TCP in that a checksum is included in the payload as with Modbus RTU.It does not require a checksum calculation, as lower layers already provide checksum protection. Modbus TCP/IP or Modbus TCP â This is a Modbus variant used for communications over TCP/IP networks, connecting over port 502.Modbus ASCII messages are framed by leading colon (':') and trailing newline (CR/LF). ![]() The ASCII format uses a longitudinal redundancy check checksum. ![]()
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