Honeywell HC900 - Page 24

Modbus Double Register Format
Unsigned/signed 32-bit Register Formats
16 HC900 Process Controller Communications User Guide Revision 13
April 2017
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