Dragino LHT65 User Manual

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LHT65 Temperature & Humidity sensor 20 / 56
2.4.11 Ext=7, Counting Sensor
In this mode, user can connect external interrupt sensor to the E2 Extension Cable for
counting purpose. Whenever there is an interrupt from this sensor, the ext value will
increase by 1.
(NOTE: This feature only supported by SN number > LHT65307029)
Above is connection to a mercury switch, rotate the mercury will generate interrupt. LHT65
will count it. It will periodically the counting value to server. 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 counting:
AT+EXT=7,0
Count at falling interrupt
AT+EXT=7,1
Count at raising interrupt
AT+SETCNT=60
Sent current count to 60
Or use downlink command A2

Dragino LHT65 Specifications

General

Brand	Dragino
Model	LHT65
Category	Accessories
Language	English