User Manual for LoRaWAN End Nodes - LHT65N LoRaWAN Temperature & Humidity Sensor Manual
Timestamp start and Timestamp end use Unix TimeStamp format as mentioned above. Devices will reply with all
data log during this time period, use the uplink interval.
For example, downlink command
31 5FC5F350 5FC6 0160 05
Is to check 2020/12/1 07:40:00 to 2020/12/1 08:40:00’s data
Uplink Internal
=5s，means
LHT65N will send one packet every 5s. range 5~255s.
2.6.5 Datalog Uplink payload
The Datalog poll reply uplink will use below payload format.
Retrieval data payload
Size(bytes)
2
2
2
1
4
Value
Poll message flag &
Ext
Poll message flag & Ext
Poll Message Flag: 1: This message is a poll message reply.
• Poll Message Flag is set to 1.
• Each data entry is 11 bytes, to save airtime and battery, devices 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.
If devise doesn’t have any data in the polling time. Device will uplink 11 bytes of 0
Example:
If LHT65N has below data inside Flash:
Page 22 / 56 - last modified by Bei Jinggeng on 2022/07/06 13:48
