User Guide

GE9
GE9GE9
GE910 Hardware User Guide
10 Hardware User Guide10 Hardware User Guide
10 Hardware User Guide
1vv0300962 Rev.4 2012-06-25
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 21 of 73
Mod. 0805 2011-07 Rev.2
4.2. Turning OFF the GE910
Turning off of the device can be done in two ways:
• via AT command (see GE910 Software User Guide, AT#SHDN)
• by tying low pin ON*
Either ways, the device issues a detach request to network informing that the device will not be
reachable any more.
To turn OFF the GE910 the pad ON* must be tied low for at least 2 seconds and then released.
A Pulse duration less than 2 seconds should also start the power off procedure, but this is not
guaranteed.
The same circuitry and timing for the power on must be used.
The device shuts down after the release of the ON* pad.
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 GE910 when the module is powered off or during
an ON/OFF transition.