Siemens Climatix S300 HRV - Encoding of Data Types

6.3.5 Encoding of data types
Data is provided as Big Endian without swapping.
Binary value encoding with one Register:
Each binary BA present value will occupy 1 register
Data type Byte order
Binary value 00 aa, with aa = 0x00 or 0x01
Multistate value encoding with one Register:
Each multistate BA present value will occupy 1 register
Data type Byte order
Multistate value (8 bit), unsigned8 00 aa, with 1:1 BACnet encoding
Multistate value (16 bit), unsigned16 bb aa, with 1:1 BACnet encoding
Unsigned integer value encoding with 2 registers
Each unsigned BA present value will occupy 2registers. Use FC16 for consistent
writing.
Data type Byte order
Unsigned integer (32 bit) dd cc bb aa
dd cc Register address x
bb aa Register address x+1
Real value encoding with 2 registers
Each analog BA present value will occupy 2registers. Use FC16 for consistent
writing.
Data type Byte order
Real value (32 bit), Float32 dd cc bb aa
dd cc Register address x
bb aa Register address x+1
With:
IEEE-754 32-bit float encoding
Engineering of communicative devices
Modbus slave
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