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The following list indicates important setup information for running in Modbus - TCP. Ensure that the master is setup with the same configuration.

• Port 502 - Modbus-TCP uses port 502. This is fixed.
• Base 1 starting address. I.e. first holding register is 40001 not 40000.
• Max holding registers for read and write is 16
• Use function code 0x10 for write single register. Function code 0x06 is not supported.
• All registers are 32-bit
  • Exception are registers 41100 and 41200 as they map the data used directly in the CM1-T Library (IEC 61131-3).
• 32-bit word mapping is little endian

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