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 25 of 25
A flow chart showing the AT commands managing procedure is displayed below:
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.
For example:
AT answer in
1 sec ?
N
Y
“Start AT CMD.”
START
DELAY 300msec
Enter AT<CR>
“Start AT CMD.”
END
GOTO
“HW SHUTDOWN
unconditional
”
GOTO
“Modem ON Proc.”