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Modbus Double Register Format
Unsigned/signed 32-bit Register Formats
Revision 4 HC900 Hybrid Controller Communications User Guide 13
9/03
3.2 Unsigned/signed 32-bit Register Formats
The formats descriptions below use the value 12345678 Hex as an example. Where the binary representation is:
Byte 4 = 12 Hex Byte 3 = 34 Hex Byte 2 = 56 Hex Byte 1 = 78 Hex
Bits
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 0 0 1 0 0 1 0 0 0 1 1 0 1 0 0 0 1 0 1 0 1 1 0 0 1 1 1 1 0 0 0
FP B – Big Endian Format
The value 12345678 Hex will be represented as follows:
Bit 31 Bit 0
High
Low
High
Low
REGISTER N
(High)
REGISTER N+1
(Low)
Byte 4
12 Hex
Byte 3
34 Hex
Byte 2
56 Hex
Byte 1
78 Hex