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LHT52 Temperature & Humidity sensor 13 / 40
Temperature & External Temperature:
➢ Example1: 0x08CD/100=22.53℃
➢ Example2: (0xF5C6-65536)/100=-26.18℃
Humidity:
➢ Humidity: 0x0220/10=54.4%
Extension #
Bytes for External Sensor:
2.4.3 Uplink FPORT=3, Datalog sensor value
LHT52 stores sensor value and user can retrieve these history value via downlink command. The
Datalog sensor value are sent via FPORT=3.
➢ Each data entry is 11 bytes, to save airtime and battery, LHT52 will send max bytes according
to the current DR and Frequency bands.
For example, in US915 band, the max payload for different DR is:
a) DR0: max is 11 bytes so one entry of data
b) DR1: max is 53 bytes so devices will upload 4 entries of data (total 44 bytes)
c) DR2: total payload includes 11 entries of data
d) DR3: total payload includes 22 entries of data.
Notice: LHT52 will save 178 set of history data, If device doesn’t have any data in the polling time.
Device will uplink 11 bytes of 0.
See more info about the Datalog feature.
2.4.4 Uplink FPORT=4, DS18B20 ID
User can get external DS18B20 ID through the downlink command.
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