User's Manual

UE866 HARDWARE USER GUIDE 1vv0301157 Rev.7 • 2015-04-17 27 of 68
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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 UE866 when the
module is powered off or during an ON/OFF transition.
“Start AT CMD”
START
Delay = 300 msec
Enter AT <CR>
Disconnect PWR Supply
AT answer in
1 sec ?
GO TO
“Modem ON Proc.”
“Start AT CMD”
END
Y
N