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LTC2 LoRaWAN Temperature Transmitter 13 / 32
After join successful, LTC2 will send uplink message with the sensor value.
Above value shows Channel1 detect 25.94 degree. There is no PT100 connected on Channel 2, so
it shows -327.67.
2.4 Uplink Payload
2.4.1 Payload Analyze
Below is the uplink payload which shows

BAT: Ex1: 0x0E3C ⇒ 3644 (mV) = 3.644 V

Status & EXT:
Bits
7
6
5
4
[3:0]
Status & Ext
Not Defined
Poll Message
Flag
Sync time
OK
Unix Time
Request
Ext:
0b(1001)
 Poll Message Flag: 1: This message is a poll message reply, 0: means this is a normal uplink.

Sync time OK: 1: Set time ok，0: N/A. After time SYNC request is send, device will set this bit to 0
until got the time stamp from application server.
 Unix Time Request:1: Request server downlink Unix time, 0 : N/A. In this mode, LTC2 will set this
bit to 1 every 10 day to request a time SYNC. (AT+SYNCMOD to set this)

EXT: The decode method for Channel 1 data and Channel 2 data

0b(0001): Upload PT100 temperature, with 2 decimals, range: -327.67 ~ 327.67 ℃

0b(0010): Upload PT100 temperature, with 1 decimals, range: -3276.7 ~ 3276.7 ℃

0b(0011): Upload Resistance instead of Temperature, range: -327.67~ 327.67 ohm
 Channel1 data and Channel 2 data
Example Payload on
channel 1 or channel 2
Sensor Value when
EXT=0b(0001)
Sensor Value when
EXT=0b(0010)
Sensor Value when
EXT=0b(0011)
Size (bytes)
2
1
2
2
4
Value
BAT
Status & EXT
Channel 1 data
Channel 2 data
Unix TimeStamp