Launch
minicom
terminal utility on the system with one of the USB ACM device port to identify that we have the correct USB ACM
device for Telit LE910 device before configuring the device, e.g. below shows how to launch
minicom
with
ttyACM1
as interface:
•
# minicom –D /dev/ttyACM1
•
Inside
minicom
, type the following AT command to identify if it is the “Telit” device
AT+GMI
•
If the response to the above command is Telit, then you have identified the correct device ttyacm port.
•
If the output is not Telit or Error, then you have to exit out of
minicom
and start
minicom
with a different port like e.g.
/dev/
ttyACM0 or /dev/ttyACM3
etc,
•
Example of starting
minicom
with
/dev/ttyACM1
as port of communication below.
root@WR-IDP-0A1D:~# root@WR-IDP-0A1D:~# minicom -D /dev/ttyACM1
Configuring the WWAN carrier parameters
Inside
minicom
terminal, the following AT commands have to be issued in sequence to configure the LTE module, the line with
DESCRIPTION
are references to the AT commands to type and are not to be entered as a part of the AT commands themselves
DESCRIPTION: Check that the SIM is inserted and PIN is unlocked using the
at+cpin?
command
DESCRIPTION: If the SIM is locked with a PIN the
at+cpin=”1234”
AT command can be used to unlock the SIM. Where the SIM
PIN is 1234, if the PIN is different, use appropriate PIN number in the command below.
DESCRIPTION : Setting up the APN. NCM can be activated using every available CID,
NOTE: Skip this step for Verizon as it is preprogrammed (use
AT+CGDCONT?
to identify if the CID3 is vzwinternet).
The
at+cgdcont=3,"IP","broadband"
command has to be issued for AT&T based SIM. In the command,
3
is the
CID(Connection ID), this can be between 1 to 5, 3 is shown to keep the value consistent between VZ and ATT based solution.
IP
in
the command indicates the TCP-IP protocol.
broadband
in the command is the name assigned by AT&T as a network ID or APN to
connect to logically, this name is assigned by the carrier.
DESCRIPTION : Check the state of the modem
at+cops?
at+cgatt?
DESCRIPTION: Run the
at#ncm=1,3
command to enable NCM on CID 3 (this command must be sent on a USB instance (in this
case USB0 or USB3)
DESCRIPTION: Run the
at#ncm=1,3
to activete the PDP context.
DESCRIPTION: Read IP address, Gateway address and DNS address from the module
at+cgcontrdp=3
REPONSE:
+CGCONTRDP:
3,6,"vzwinternet.mnc480.mcc311.gprs","100.176.244.64.255.255.255.0","100.176.244.65","10.133
.17.210","0.0.0.0","0.0.0.0","0.0.0.0"
OK
Establishing LTE WWAN connectivity
46
