Define Instruments G3 IoT Manual page 55

Notes on Modbus Addressing
1 This unit uses a swapped word order for Modbus 32 bit values (integers and floats).
It sends/receives a 32 bit value as least significant word first, followed by the most
significant word.
Integer Example: if the integer value is 100,000 (0x000186A0), the LSW 0x86A0 will
be sent first, followed by the MSW 0x0001.
Float Example: if the float is value is 1.234 (0x3F9DF3B6), the LSW 0xF3B6 will be sent
first, followed by the MSW 0x3F9D.
2 Modicon address notation specifies the valid range for holding registers to be between
40,001 to 49,999.
This notation convention imposes a 10,000 register limit that doesn't exist in the
underlying protocol. You may see the alternate notation 400,001 to 465,536 being
used to denote registers outside the standard Modicon range.
For example, 400,001 is equivalent to 40,001, and 412,345 would be equivalent to
40,001 + 12,344.
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G3 IoT Manual | Doc No: 2303-00000-0-1 | Rev: 24V05 | 19 Mar, 2024
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