Hardware Manual

The Temperature Monitor is a function of the module that permits control of its internal
temperature and if properly set (see the #TEMPMON command on AT Interface guide) raises
to High Logic level a GPIO when the maximum temperature is reached.
The STAT_LED pin status shows information on the network service availability and Call
status. In the HE910 V2 modules, the STAT_LED usually needs an external transistor to
drive an external LED. Because of the above, the status indicated in the following table is
reversed with respect to the pin status:
Device Status
LED status
Device off
Permanently off
Not registered
Permanently on
Registered in idle
Blinking 1 sec on + 2 sec off
Registered in idle + power saving
It depends on the event that triggers the wakeup
(In sync with network paging)
Voice Call Active
Permanently on
Dial-Up
Blinking 1 sec on + 2 sec off
A schematic example could be: