User Manual for LoRaWAN End Nodes - LHT65N LoRaWAN Temperature & Humidity Sensor Manual
If the external sensor is 0x01, and there is no external temperature connected. The temperature will be set to
7FFF which is 327.67℃
2.4.6.2 Ext=9, E3 sensor with Unix Timestamp
Timestamp mode is designed for LHT65N with E3 probe, it will send the uplink payload with Unix timestamp. With
the limitation of 11 bytes (max distance of AU915/US915/AS923 band), the time stamp mode will be lack of BAT
voltage field, instead, it shows the battery status. The payload is as below:
Size(bytes)
2
2
2
1
4
Value
BAT Status &
Status &
Ext
•
Battery status & Built-in Humidity
Bit(bit)
[15:14]
[11:0]
Value
BAT Status
00(b): Ultra Low ( BAT <= 2.50v)
01(b): Low (2.50v <=BAT <= 2.55v)
10(b): OK (2.55v <= BAT <=2.65v)
11(b): Good (BAT >= 2.65v)
•
Status & Ext Byte
• 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 sent, LHT65N will set this bit to 0
until got the time stamp from the application server.
• Unix Time Request: 1: Request server downlink Unix time, 0 : N/A. In this mode, LHT65N will set this bit to 1
every 10 days to request a time SYNC. (AT+SYNCMOD to set this)
2.4.6.3 Ext=6, ADC Sensor (use with E2 Cable)
In this mode, user can connect external ADC sensor to check ADC value. The 3V3_OUT can
be used to power the external ADC sensor; user can control the power on time for this
sensor by setting:
AT+EXT=6,timeout
Time to power this sensor, from 0 ~ 65535ms
For example:
AT+EXT=6,1000 will power this sensor for 1000ms before sampling the ADC value.
Or use
downlink command A2
to set the same.
The measuring range of the node is only about 0.1V to 1.1V The voltage resolution is about 0.24mv.
Page 16 / 56 - last modified by Bei Jinggeng on 2022/07/06 13:48
