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 28 of 28
4.2 Turning OFF the HE910
Turning off of the device can be done in two ways:
• via AT command (see HE910 Software User Guide, AT#SHDN)
• by tying low pin ON_OFF*
Either ways, the device issues a detach request to network informing that the device will not be
reachable any more.
To turn OFF the HE910 the pad ON_OFF* must be tied low for at least 3 seconds and then
released.
TIP:
To check if the device has been powered off, the hardware line PWRMON must be monitored.
The device is powered off when PWRMON goes low.
NOTE:
In order to avoid a back powering effect it is recommended to avoid having any HIGH logic
level signal applied to the digital pins of the HE910 when the module is powered off or during
an ON/OFF transition.