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MIW-RSTHM-2-EN-000 - 15 / 01 / 2019
9 - 10
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MODBUS REGISTER MAPS
INPUT REGISTERS
Data type
Description
Data
Values
1
Temperature reading
signed int.
Actual temperature level
-300—700
500 =
50,0 °C
2
Relative humidity level
unsigned int.
Actual relative humidity level
0—1.000 1.000 =
100,0 % rH
3
Dew point
signed int.
Calculated dew point
-700—700
200 =
20,0 °C
4
Reserved, returns “0”.
5
Ambient light intensity
unsigned int.
Measured light intensity
0—32.000 1.000 =
1.000 lx
6
Active / standby
unsigned int.
Active or Standby indication according the Active /
Standby light level defined via holding registers 34
and 35. If the measured light level is between the
two levels the indication is 0 (Low intensity)
0—2
0 =
1 =
2 =
Low light intensity
Active
Standby
7—10
Reserved, return “0”.
11
Output value 1
(temperature)
unsigned int.
Analog output value for temperature (T)
0—1.000
0 =
1.000 =
0 %
100 %
12
Output value 2 (relative
humidity)
unsigned int.
Analog output value for relative humidity (rH)
0—1.000
0 =
1.000 =
0 %
100 %
13
Reserved, returns “0”.
14
Temperature alert flag
unsigned int.
Flag indicates that measured temperature is outside
set alert values. Set to ‘1’ when the measured value
is outside the temperature alert values defined by
holding registers 20 and 21.
0—1
0 =
1 =
Measured temperature is OK
Measured temperature is too high/ low
15
Relative humidity alert flag
unsigned int.
Flag indicates that measured relative humidity
is outside set alert values. Set to ‘1’ when the
measured value is outside the relative humidity alert
values defined by holding registers 22 and 23.
0—1
0 =
1 =
Measured rH is OK
Measured rH is too high/ low
16
Reserved, return “0”.
17
Temperature range limit flag unsigned int.
Flag indicates that measured temperature is outside
set range limit values. Set to ‘1’ when the measured
value is outside the temperature range limit values
defined by holding registers 14 and 15.
0—1
0 =
1 =
Temperature range is OK
Temperature range is too high/ low
18
Relative humidity range
limit flag
unsigned int.
Flag indicates that measured relative humidity is
outside set range limit values. Set to ‘1’ when the
measured value is outside the relative humidity limit
range values defined by holding registers 16 and 17.
0—1
0 =
1 =
rH range is OK
rH range is too high/ low
19
Reserved, returns “0”.
20
Humidity / temperature
sensor fault
unsigned int.
Flag indicates if the communication with the
temperature and humidity sensor is lost.
0—1
0 =
1 =
No
Yes
21
Reserved, returns “0”.
22
Ambient light sensor fault
unsigned int.
Flag that shows if the communication with the
ambient light sensor is lost.
0—1
0 =
1 =
No
Yes
HOLDING REGISTERS
Data type
Description
Data
Default
Values
1
Device slave address
unsigned int.
Modbus device address
1—247
1
2
Modbus baud rate
unsigned int.
Modbus communication baud rate
0—6
2
0 =
1 =
2 =
3 =
4 =
5 =
6 =
4.800
9.600
19.200
38.400
57.600
115.200
230.400
3
Modbus parity mode
unsigned int.
Parity check mode
0—2
1
0 =
1 =
2 =
8N1
8E1
8O1
4
Device type
unsigned int.
Device type
(Read only)
RSTHM-2 = 1094
5
HW version
unsigned int.
Hardware version of the device
(Read only)
XXXX
0x0100 =
HW version 1.00
6
FW version
unsigned int.
Firmware version of the device
(Read only)
XXXX
0x0100 =
FW version 1.00
7—13
Reserved, return “0”.
14
Minimum temperature
range
unsigned int.
Minimum value of the temperature
range; cannot be set higher than max.
temperature range minus 5
º
C
0 — (Max. range — 50)
0
100 =
10,0 °C
15
Maximum temperature
range
unsigned int.
Maximum value of temperature
range; cannot be set lower than min.
temperature rang e plus 5
º
C
(Min. range + 50) – 500
500
500 =
50,0 °C
RSTHM-2
COMBINED T AND RH
ROOM TRANSMITTER