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MIW-RSTHX-2-EN-000 - 15 / 02 / 2018
9 - 11
NOTE
By default, the LED indication refers to temperature measurements. This can be
changed to relative humidity via Modbus Holding Register 26 (see
Table
Holding
registers
below
).
Ambient light sensor
The measured light intensity in luxes is available in Input Register 5. Additionally,
an active and standby level can be defined in Holding registers 34 and 35. Input
Register 6 indicates if the measured value is below standby level, above active level
or in between both levels:
■
If the measured light level is below the Standby level, Input Register 6 indicates
“Standby”.
■
If the measured ambient light level is above the Active level, Input Register 6
indicates “Active”.
■
If the measured ambient light level is between the active and stand-by level, Input
Register 6 indicates “Low intensity”. When this feature is used, it is advisable to
adjust the active and standby levels in Holding Registers 34 and 35 according to
the actual ambient light conditions around the sensor.
VERIFICATION OF INSTALLATION INSTRUCTIONS
After switching on the power supply one of the LEDs lights up according to the
status of the measured variable. If this is not the case, check the connections.
MODBUS REGISTER MAPS
INPUT REGISTERS
Data type
Description
Data
Values
1
Temperature
signed int.
Actual temperature level
-300—700
500 =
50,0 °C
2
Relative humidity
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
CO
2
unsigned int.
Actual CO
2
level
400—2.000
2.000 =
2.000 ppm
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
Analog output value 1
(temperature)
unsigned int.
Analog output value for temperature (T)
0—1.000
0 =
1.000 =
0 %
100 %
12
Analog 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, returns “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
RSTHX-2
COMBINED TEMPERATURE AND RELATIVE
HUMIDITY ROOM TRANSMITTER
