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Communication settings (INT16)
Parameter
Write register: function code 0x06
Modbus address
Modbus protocol settings
Device information (INT16)
Parameter
Read register: function code 0x03 / 0x04
Serial number (as ASCII)
Firmware version
Sensor name (as ASCII)
Device status (bit decoded)
1) Register number starts from 1.
2) Protocol address starts from 0.
3) For Modbus protocol settings see Application Note Modbus AN0103 (available at www.epluse.com/hts201).
4) See chapter 5.5 Device Status Indication.
Tab. 4
HTS201 registers for device setup
5.2.5.
Modbus Register Map
The measured data is saved as a 32 bit floating point values (data type FLOAT32) and as 16 bit signed integer
values (data type INT16).
FLOAT32
Parameter
Read register: function code 0x03 / 0x04
Temperature T
Relative humidity RH, Uw
Dew point temperature Td
INT16
Parameter
Read register: function code 0x03 / 0x04
Temperature T
Relative humidity RH, Uw
Dew point temperature Td
1) The choice of measurement units (metric or non-metric) must be done according to the ordering guide, see HTS201 datasheet.
Switching from metric to non-metric or vice versa by using the PCS10 is not possible.
2) Register number starts from 1
3) Register address starts from 0
4) 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.
Tab. 5
HTS201 FLOAT32 and INT16 measured data registers
Register number
3)
Register number
4)
1)
Unit
Register number
°C
°F
K
%
°C
°F
°K
1)
Unit
Scale
°C
100
°F
50
°K
50
%RH
100
°C
100
°F
100
°K
100
1)
[Dec]
1
2
1)
[Dec]
1
9
10
602
2)
[DEC]
1003
1005
1009
1021
1105
1107
1147
4)
2)
Register number
[DEC] Register address
4002
4003
4005
4011
4053
4054
4074
User Manual HTS201
2)
Register address
[Hex]
0x00
0x01
2)
Register address
[Hex]
0x00
0x08
0x09
0x259
3)
Register address
[HEX]
0x3EA
0x3EC
0x3F0
0x3FC
0x450
0x452
0x47A
3)
[HEX]
0xFA1
0xFA2
0xFA4
0xFAA
0xFD4
0xFD5
0xFE9
Humidity and Temperature Room Sensor | 13
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