User's Manual

HE910 Hardware User Guide
1vv0300925 Rev.28 – 2015-06-24
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 75 of 75
14.4 Indication of network service
availability
The STAT_LED pin status shows information on the network service availability and Call
status. The function is available as alternate function of GPIO_01 (to be enabled using the
AT#GPIO=1,0,2 command).
In the HE910 modules, the STAT_LED needs an external transistor to drive an external LED.
Therefore, 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 1sec 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: