How do I decode a Thermocouple Temperature Sensor event?

How do I decode a Thermocouple Temperature Sensor event?

The Thermocouple Temperature Sensor will generate events based on temperature measurements rising above or falling below configured thresholds, report-on-change, and periodic messaging.
 
Byte 0: 7-4

 Byte 0: 3-0

 Byte 1

 Byte 2

 Byte 3  and Byte 4

Byte 5
Protocol version

 
(4 bits)

 Counter

 
 
(4 bits)

 Message Type Code

 
 
 
0x13

 Temp event payload

 Temperature Reading

 
(16 bits, sign bit, 11 bits of integer, and 4 bits of fractional temp, 2’s complement)

 
 
 
 
 
(0x000.0 in the example below)

 Faults

 
 
(each bit represents an error type, 8 possible errors)
 
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 Code

              0x13 represents the Thermocouple Temperature Sensor Message Type Code                      

 
Thermocouple Temperature 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

                  0x05                              Faults

 
Byte 3 and 4

              Current temperature in degrees Celsius

 
 
Temperature (Celsius)

 Bytes 3-4 (hex)

 Byte 4 bits 3:0 (Last nibble)
Max temp, +1600.00

 0x640 0

 Nibble=0 = 0000 bin    0
+1000.4375

 0x3E8 7

 Nibble=0 = 0111 bin    7/ 16
+100.9375

 0x064 F

 Nibble=F = 1111 bin    15/16
+25.500

 0x019 8

 Nibble=8 = 1000 bin    8 / 16
+0.0625

 0x000 1

 Nibble=1 = 0001 bin    1 /16
+0.000

 0x000 0

 Nibble=0 = 0000 bin    0 /16
-0.0625

 0xFFF F

 For negative numbers,

F = - 1/16th
-0.25

 0xFFF C
 
-1.000

 0xFFF 0
 
Min temp -250.000

 0xF06 0

 For negative number 0 is

-15/16ths
 
Byte 4 bits 3:0 are fractions, 8/16, 4/16, 2/16, 1/16

 
Byte 5

Faults: If something goes wrong with the thermocouple such as detection of a broken probe, a fault message will be generated and a code provided in byte 5 of the uplink based on the following table:

 
Bit

 Description
7

 The cold-Junction temperature is outside of the normal operating range
6

 The hot junction temperature is outside of the normal operating range
5

 The cold-Junction temperature is at or above than the cold-junction temperature high threshold
4

 The Cold-Junction temperature is lower than the cold-junction temperature low threshold
3

 The thermocouple temperature is too high
2

 Thermocouple temperature is too low
1

 The input voltage is negative or greater than VDD

 
0

 An open circuit such as broken thermocouple wires has been detected
 

 
Example of Thermocouple Temperature Sensor Event Message

10 13 00 014e 00

 
1                                 Protocol Version (currently always 0x1)

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

13                               Message Type Code (0x13 = Thermocouple Temperature Sensor Identifying value)

00                               Thermocouple Temperature Sensor Event Payload (0x00 = Periodic Report)

014e                            Thermocouple Temperature (0x014e in 2’s compliment= 20.88 Celsius)

00                                Thermocouple Fault Type Code (0x00 = No Faults)

 
Same Thermocouple Temperature Sensor Event Message (but with negative temperature: -20.88 Celsius)

10 13 00 FEB2 00

 
1                                 Protocol Version (currently always 0x1)

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

13                                Message Type Code (0x13 = Thermocouple Temperature Sensor Identifying value)

00                              Thermocouple Temperature Sensor Event Payload (0x00 = Periodic Report)

FEB2                            Thermocouple Temperature (0xFEB2 in 2’s compliment = -20.88 Celsius)

00                                Thermocouple Fault Type Code (0x00 = No Faults)

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

Temperature Event: Periodic Report

Temperature in degrees Celsius: 20.88 C

Faults: No Faults

 
 
 
 
 
 
 
 


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