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Modbus Double Register Format
Unsigned/signed 32-bit Register Formats
16 HC900 Hybrid Controller Communications User Guide Revision 4
9/03
FP LB – Little Endian Byte Swap Format
The value 12345678 Hex will be represented as follows:
Bit 15 Bit 24
High
Low
High
Low
REGISTER N
(High)
REGISTER N+1
(Low)
Byte 2
56 Hex
Byte 1
78 Hex
Byte 4
12 Hex
Byte 3
34 Hex
Bit 8 Bit 23 Bit 16 Bit 31 Bit 0 Bit 7