GL865 Hardware User Guide
1vv0300910 Rev.1 – 2011-07-22
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved
page 17 of 79
5.
Hardware Commands
5.1.
Auto-Turning ON the GL865
To Auto-turn on the GL865, the power supply must be applied on
the power pins VBATT and VBATT_PA, after 1000 m-seconds, the
V_AUX / PWRMON
pin will be at the high logic level and the module
can be consider fully operating.
When the power supply voltage is lower than 3.4V, after 4000 m-
seconds, the
V_AUX / PWRMON
pin will be at the high logic level
and the module can be consider fully operating.
The following flow chart shows the proper turn on procedure:
Modem ON Proc.
PWR supply =
ON?
Y
Delay 1s - 4s
for Low Voltage
Operating
Y
Modem Reset Proc
.
AT init sequence
.
N
Start AT CMD
.
N
PWMON = ON?
Y
PWMON = ON?
Delay 300mS
Enter AT<CR>
AT answer in
1second ?
N
Y
N
Delay 1s