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LTC2 LoRaWAN Temperature Transmitter 30 / 32
Step 2: Measure the resistance between the two shorted wires of PT100 Probe. ‘;
As example, in this step, we check the shorted wire (both red) with 0.594 ohm, So we know that
each wire of PT100 has (0.594-0.002)/2=0.296R (Where 0.002 is the value we got from step 1) .
Step 3: Run Calibrate Command.
Run this command to both channels to use 0.296R calibrate resistance.
AT+RCABLE=296,0 --> Calibrate Channel 1 with 0.296R
Or use LoRaWAN downlink command (0xA8 Code) to set:
0xA801280000
User can use 0xA9 downlink command to poll the current calibration value.
Step 4: Connect the PT100 to LTC2