Dragino LHT65 User Manual

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LHT65 Temperature & Humidity sensor 16 / 56
2.4.8 Ext=4, Interrupt Sensor
In this mode, user can connect external interrupt sensor to the E2 Extension Cable to check
the open/close status from the sensor. For example, it can be used to connect to a door
sensor to check the open / close status, or connect to a mercury switch to detect the titling.
(NOTE: This feature only supported by SN number > LHT65307029)
Above is connection to a mercury switch, rotate the mercury will generate interrupt. LHT65
will detect it and send an uplink package to sever. User can also connect PA9 and PA10
together, with these two pins shortcut, LHT65 will know if the probe is connected well in the
socket.
User can use AT Command to set the method to detect Interrupt:
AT+EXT=4,1
Sent uplink packet in both rising and falling interrupt
AT+EXT=4,2
Sent uplink packet only in falling interrupt
AT+EXT=4,3
Sent uplink packet only in rising interrupt
Or use downlink command A2
Payload explain:

Dragino LHT65 Specifications

General

Brand	Dragino
Model	LHT65
Category	Accessories
Language	English