Section 50
00-02-0674
04-16-10
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23 -
General Operation: Thermocouple Remote
– ONE CHANNEL
A Thermocouple Remote (TC Remote) can read either Type K or Type J thermocouples and it
reports temperature in Fahrenheit.
The TC Remote reports two temperatures to the Gateway every time it sends a heartbeat.
These temperatures are located at:
Ambient Temp
Register 17 into the Remotes register space (217, 267, …)
Thermocouple Temp
Register 23 into the Remotes register space (223, 273, …)
A TC Remote is a low power device that utilizes sleep functionality to extend battery life. The
Remote remains in a sleep state until one of the following conditions occur:
A heartbeat needs to be sent to the Gateway.
The thermocouple inputs need to be tested.
Heartbeat:
The Remote is programmed to send a heartbeat to the Gateway on a periodic basis
which allows the Gateway to detect if a Remote goes offline due to RF communication
issues or some other failure condition.
During the heartbeat operation, the Remote‟s ambient temperature and thermocouple
temperature are sent to the Gateway.
Reading the Thermocouple Input:
The TC Remote wakes up on a periodic basis and reads the TC inputs. If the value is
within operational parameters, then the Remote simply goes back to sleep until it is time
to send a heartbeat or take another TC reading.
NOTE:
Default reading delay is 15 seconds.
If the TC indicates that an event condition exists, then the Remote takes appropriate
action immediately. Several things can cause an event condition including:
Inability to initialize the sensor hardware.
An open circuit is detected for the TC sensor.
The TC fell below an absolute minimum temperature.
o
Default is 32F
The TC rose above an absolute maximum temperature.
o
Default is 195F
