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M 5 7 4 8
7.6
Dewpoint Interface
The Dewpoint sensor available on the SP-003-2 and SP-004-2 provides the calculated dewpoint based on the
measured temperature and relative humidity.
Dewpoint Descriptor
Offset
Name
Value
Description
0x00
Sensor Type
0x36
Dewpoint temperature in oC
0x01
Data Type/Format
0x06
Float type
0x02
Configuration
??
See below
0x03
Sensor Device
0x00
Not Used
0x04
UOMR
“oC”
Units of measure
Dewpoint Temperature Sensor Type
Sensor Type
SI Derived Units
Measurement
0x36
o
C
Dewpoint Temperature
Temperature Data Type/Format
Temperature Data Type/Format
7
6
5
4
3
2
1
0
Smart
Sensor
Writeable
Factory
Calibrate
Reserved
Data Type
0
0
0
0
6 == Floating point
Data Type
The 4-bit Data Type field determines the type of data of the specific sensor.
Factory Calibrate
The Factory Calibrate bit is used during factory calibration. If set, factory calibration is
performed on the raw sensor reading PRIOR to user scaling.
Writeable
The writeable bit is cleared, indicating that the sensor values may not be overwritten.
Smart Sensor
This bit is cleared.
Dewpoint Temperature Configuration Byte
Dewpoint Temperature Configuration Byte
7
6
5
4
3
2
1
0
Available
Assigned
Apply
Scaling
Lock
Sensor Selection
0
0
?
?
0x06(Internal Use)
Lock
If set, the user specified units of measure string (4 character maximum) will be used in
place of the default units of measure.