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LTC2 LoRaWAN Temperature Transmitter
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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
2
2
1
4
Value
