User's Manual

L
LE920 Hardware User Guide
1vv0301026 Rev.0 - draft4 – 2013-05-
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved. Page 27 of 76
4.3.
Turning OFF the LE920
Turning off the device can be done in three ways:
x by Software command
x by Hardware shutdown
x by Hardware Unconditional Restart
x by Hardware Unconditional shutdown
When the device is shut down by software command or by hardware shutdown, it issues to
the network a detach request that informs the network that the device will not be reachable
any more.
TIP:
To check if the device has powered off, hardware line PWRMON must be monitored. When
PWRMON goes low it can be considered the device has powered off.
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 module when is powered OFF or during an
ON/OFF transition.