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4.3
Modbus Register Map
Following Modbus register map is valid for both, the I
32 bit floating point values (data type FLOAT) and as 16 bit signed integer values (data type INTEGER), please
refer to Tab. 10 and Tab. 11 below:
FLOAT 32
Parameter
Read register: function code 0x03
Temperature T
Temperature T
Temperature T
CO
(average), pc
2
3)
CO
(raw), pc
2
CO
(average), npc
2
4)
CO
(raw), npc
2
Pressure p
Pressure p
1) Register number starts from 1
2) Register address starts from 0
3) pc ... pressure compensated
4) npc ... not pressure compensated
2
Tab. 10
I
C and UART Modbus register map for 32 bit floating point values
INT16
Parameter
Read register: function code 0x03
Temperature T
Temperature T
Temperature T
CO
(average), pc
2
4)
CO
(raw), pc
2
CO
(average), npc
2
5)
CO
(raw), npc
2
Pressure p
Pressure p
1) Register number starts from 1
2) Register address starts from 0
3) Examples: For scale 100, the reading of 2550 means a value of 25.5. For scale 50, the reading of 2550 means a value of 51.
4) pc ... pressure compensated
5) npc ... not pressure compensated
2
Tab. 11
I
C and UART Modbus register map for 16 bit signed integer values
4.4
General Purpose Registers for Individiual Use
There are two registers reserved for any customer use, e.g. serial number, traceability, etc.
Register number
Write register: function code 0x06 / Read register: function code 0x03
5801
5802
1) Register number starts from 1
2) Register address starts from 0
Tab. 12
Registers for special customer purpose
Unit
°C
°F
K
3)
ppm
ppm
4)
ppm
ppm
mbar
psi
Unit
°C
°F
K
4)
ppm
ppm
5)
ppm
ppm
mbar
psi
1)
[DEC]
Register address
2
C and the UART interface. The measured data is saved as
1)
Register number
[DEC]
1003
1005
1009
1061
1063
1065
1067
1201
1203
3)
Scale
Register number
100
4002
50
4003
50
4005
1
4031
1
4032
1
4033
1
4034
10
4101
100
4102
2)
[HEX]
0x16A8
0x16A9
Miniature Sensor Module for CO
User Manual EE895
Register address
0x3EA
0x3EC
0x3F0
0x424
0x426
0x428
0x42A
0x4B0
0x4B2
1)
[DEC] Protocol address
0xFA1
0xFA2
0xFA4
0xFBE
0xFBF
0xFC0
0xFC1
0x1004
0x1005
Space (standard Modbus register)
16 bits / 2x8 bits / 2 bytes
16 bits / 2x8 bits / 2 bytes
, Temperature and Barometric Pressure | 17
2
2)
[HEX]
2)
[HEX]
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