How do I decode an Air Temperature and Humidity event?

How do I decode an Air Temperature and Humidity event?

 

The Air Temperature and Humidity Sensor will generate events when the environment changes to exceed set thresholds or on a periodic basis.

 

​

Byte 0: 7-4

Byte 0: 3-0

Byte 1

Byte 2         

Byte 3

 

 

Byte 4

 

Byte 5

Byte 6

Protocol version

 

(4 bits)

Counter

 

 

(4 bits)

Message Type Code

 

 

 

 

 

 

 

(0x0D in the example below)

Event Type

 

 

 

 

 

 

 

 

(0x05 in the example below)

Current temperature in degrees Celsius with signed 8 bit #

 

 

 

 

(0x97 in the example below)

First decimal of current temperature (0-9) in the most significant 4 – bits

 

 

 

(0x70 in the example below)

 

Humidity in % relative humidity 

(0-100%)

 

 

 

 

 

(0x3D in the example below)

First decimal of relative humidity (0-9) in most significant 4-bits

 

 

(0x80 in the example below)

Protocol Definition

              First 4 bits are defined by Radio Bridge for the protocol

              Next 4 bits are a counter that goes from 0 to F (Hex) and repeats

             

Message Type

              0x0D represents the Air Temperature and Humidity Event Message Type

 

Air Temperature and Humidity Event Type Payload Definitions

              Byte 2                         Description

   0x00                                    Periodic Report

   0x01                                    Temperature has risen above upper threshold

   0x02                                    Temperature has fallen below lower threshold

   0x03                                    Temperature report on change increase

   0x04                                    Temperature report on change decrease

   0x05                                    Humidity has risen above upper threshold

   0x06                                    Humidity has fallen below lower threshold

   0x07                                    Humidity report on change increase

   0x08                                    Humidity report on change decrease



Air Temperature  Byte 3 and 4 Definitions

​

              Byte 3: Bit 7 is the sign bit

                             0 = Positive

                             1 = Negative

 

              Byte 3: Bit 6:0 is the hex value of the integer part of temperature

 

              Byte 4: Is the fractional part of the temperature

 

Humidity Byte 5 and 6 Definitions

 

              Byte 5: Bit 7 is the sign bit

                             0 = Positive

                             1 = Negative

 

              Byte 5: Bit 6:0 is the hex value of the integer part of humidity

 

              Byte 6: Is the fractional part of the humidity

 

Example of Air Temperature and Humidity Event Message

 

10 0D 05 97 70 3D 80

 

1                                    Protocol Version (currently always 0x1)

0                                    Packet Counter (increments by 1 each message and wraps from 0xF to 0x0)

0D                                 Message Type Code (Air Temp and Humidity Event = 0x0D)

05                                   Event (Humidity has risen above upper threshold = 0x05)

97                                  Current Temperature in degrees Celsius (-23 = 0x97)

70                                   First decimal of current temperature (7 = 0x70)

3D                                  Humidity in % relative humidity (61 = 0x3D)

80                                   First decimal of relative humidity (8 = 0x80)

 

The Radio Bridge Console will generate the following output for this message:

Humidity has risen above upper threshold

Current temperature in degrees Celsius -23.7

Humidity in % relative humidity 61.8



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