Dragino LHT65 User Manual

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LHT65 Temperature & Humidity sensor 29 / 56
2.6.4 Datalog Uplink payload
The Datalog poll reply uplink will use below payload format.
Retrieval data payload
Size(bytes)
2
2
2
1
4
Value
External
sensor data
Built-In
Temperature
Built-in
Humidity
Poll message
flag & Ext
Unix Time
Stamp
Poll message flag & Ext
Bit(bit)
14
[7:0]
Value
Poll message flag
Ext
Extension Sensor Type
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 LHT65 has below data inside Flash:
Flash Addr |Unix Time | Ext | BAT voltage| Value
80196E0 21/1/19 04:27:03 1 3145 sht_temp=22.00 sht_hum=32.6 ds_temp=327.67
80196F0 21/1/19 04:28:57 1 3145 sht_temp=21.90 sht_hum=33.1 ds_temp=327.67
8019700 21/1/19 04:30:30 1 3145 sht_temp=21.81 sht_hum=33.4 ds_temp=327.67
8019710 21/1/19 04:40:30 1 3145 sht_temp=21.65 sht_hum=33.7 ds_temp=327.67
8019720 21/1/19 04:50:30 1 3147 sht_temp=21.55 sht_hum=34.1 ds_temp=327.67
8019730 21/1/19 05:00:30 1 3149 sht_temp=21.50 sht_hum=34.1 ds_temp=327.67
8019740 21/1/19 05:10:30 1 3149 sht_temp=21.43 sht_hum=34.6 ds_temp=327.67
8019750 21/1/19 05:20:30 1 3151 sht_temp=21.35 sht_hum=34.9 ds_temp=327.67
If user send below downlink command:
3160065F9760066DA705
Where : Start time: 60065F97 = time 21/1/19 04:27:03
Stop time 60066DA7= time 21/1/19 05:27:03

Dragino LHT65 Specifications

General

Brand	Dragino
Model	LHT65
Category	Accessories
Language	English