How do I decode an External Probe Temperature Sensor Event?

How do I decode an External Probe Temperature Sensor Event?

The External Probe Temperature Sensor will generate events if the temperature rises above or falls below the configured thresholds.

 
Byte 0: 7-4

 Byte 0: 3-0

 Byte 1

 Byte 2 

 
 Byte 3

 Byte 4

Protocol version

 
 

(4 bits)

 Counter

 
 
 

(4 bits)

 Temperature

Message Type Code

 
 
0x09

 Temperature

Event

 
 
 
(0x03 in the example below)

 Temperature

In Celsius

 
 
 
(0x14 in the example below)

 
 Relative temperature measurement (0-255)

 
 
(0x32 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

              0x09 represents the External Probe Temperature Sensor Message Type

 
External Temperature Probe Sensor Event

              Byte 2                         Description

                  0x00                              Periodic Report

                  0x01                              Temperature has risen above upper threshold

                  0x02                              Temperature has fallen below lower threshold

                  0x03                              Report on change increase                   

                  0x04                              Report on change decrease

 
Byte 3

              Relative temperature measurement (0-255). When a temperature is out of range, it will be reported as 0x7f (highest positive signed number) on the high end and 0x80                                            on the low end.

 

Example of External Probe Temperature sensor Event Message

10 09 03 14 32

 
1                                 Protocol Version (currently always 0x1)

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

09                               Message Type Code (0x09 it the External Probe Temperature message type code

03                               External Probe Temperature Event (Event 0x03 Report on change increase)

14                               Current Temperature (0x14 = 20 degrees Celsius)

32                               Relative measurement (0x32 = 50)

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

 
Temperature Event: Report on Change

Temperature in degrees Celsius: 20 C

 
 
 
 



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