User's Manual

HC864-AUTO Hardware User Guide
1vv0300946 Rev.4 – 2012-12-27
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights
Reserved. Page 22 of 77
4.3. Turning OFF the HC864-AUTO
Turning off the device can be done in three ways:
by software command (see HC864-AUTO Software User Guide)
by Hardware shutdown
by Hardware Unconditional Restart
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.