What fundamental element did Modbus TCP/IP eliminate the need for regarding error checking in serial communication?
Answer
CRC or LRC
Modbus TCP/IP adapts the core message structure for transport over standard Ethernet infrastructure by encapsulating the message within TCP/IP packets. Because the TCP/IP layer itself provides robust network-level error checking and integrity assurance, the reliance on the serial-specific error checking mechanisms—Cyclic Redundancy Check (CRC) for RTU or Longitudinal Redundancy Check (LRC) for ASCII—is effectively removed from the Modbus layer itself. This encapsulation allows the protocol to leverage existing IT infrastructure without the associated constraints of serial physical layers.
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