RESI®
Title:
RESI-KNX-MBMASTER Manual
Date
Page
of
10.09.2018
27
30
.
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We enter the value 23.45 and get a representation of the floating point number as a 32 bit hexadecimal
number. It is the number 0x41BB999A. Now we store this value in the same way as we saved the UINT32
value:
But we can also use the reverse notation:
Now we show a widespread trap concerning the storing and reading of more than one MODBUS register. We
use another floating-point value. As a hexadecimal number, it is the number 0x41BC41BB. Again we use the
online converter:
You notice, it's the floating-point number 23.532095.
Now we store this number with the upper word first in two registers:
MODBUS
Register
Storing of FLOAT32 data types
4x00010
I:9
The upper word of the 32-bit value 0x41BB999A is stored in the first 16-bit
MODBUS register. This means that the value 0x41BB is stored here.
4x00011
I:10
The lower word of the 32-bit value 0x41BB999A is stored in the first 16-bit
MODBUS register. This means that the value 0x999A is stored here.
MODBUS
Register
Storing of FLOAT32 data types
4x00010
I:9
The lower word of the 32-bit value 0x41BB999A is stored in the first 16-bit
MODBUS register. This means that the value 0x999A is stored here.
4x00011
I:10
The upper word of the 32-bit value 0x41BB999A is stored in the first 16-bit
MODBUS register. This means that the value 0x41BB is stored here.
MODBUS
Register
Storing of FLOAT32 data types
4x00010
I:9
HIGH WORD
The upper word of the 32-bit value 0x41BC41BB is stored in the first 16-bit
MODBUS register. This means that the value 0x41BC is stored here.
4x00011
I:10
LOW WORD
The lower word of the 32-bit value 0x41BC41BB is stored in the first 16-bit
MODBUS register. This means that the value 0x41BB is stored here.
