Installation
use the command “diagnose system modem com /dev/ttyusb1” from the console to get NMEA messages
displayed on the console, as illustrated below:
FortiWiFi-40F-3G4G # dia sys modem com /dev/ttyusb1
Serial port: /dev/ttyusb1
Do not run this command when modem is dialing or connected!
Press Ctrl+W to exit.
$GPGGA,,,,,,0,,,,,,,,*66
$GPGGA,,,,,,0,,,,,,,,*66
$GPVTG,,T,,M,,N,,K,N*2C
$GPVTG,,T,,M,,N,,K,N*2C
$GPRMC,,V,,,,,,,,,,N*53
$GPRMC,,V,,,,,,,,,,N*53
$GPGSA,A,1,,,,,,,,,,,,,,,,*32
$GPGSA,A,1,,,,,,,,,,,,,,,,*32
l Location information does not rely on the data service. Even if you are using a device
without a SIM card plugged in, it is possible for you to get the accurate location
information.
l The GPS port is disabled by default because some FGT30E_GBL does not have a GPS
antenna. The GPS antenna is added back for SOC4 FortiGate LTE variants.
If the GPS daemon is enabled, the above messages will not show up because the GPS port is occupied by the daemon.
To check modem GPS signal information, use the command “diagnose test app 23”. It will show the available
satellites that the modem could use. The more satellites it detects, the better the GPS signal is.
By using command “diagnose system modem com /dev/ttyusb2”, you will be connected to the Modem
interface. Because the LTE modem daemon is running, it issues AT commands to the modem port periodically, so you
will see a lot of output from the AT Command interface. So you may want to avoid using the AT command interface
directly so that it won't disturb the background work by LTE daemon.
On EM modems, everything that an AT Command can do can be done by some QMI messages. QMI is a binary format
protocol for modems. The messages are more compact and much faster because they are in raw format and transferred
by USB control messages, while AT commands are limited by the baud rate of the serial port. More important, the QMI
protocol is an industrial standard wireless communication protocol. AT commands vary from vendor to vendor. Different
vendors have different AT Command sets, which is very inconvenient.
For 30E 3G4G devices, we rely very little on AT Commands. In fact, the AT Commands of EM
modems can’t even make a connection. We use QMI messages instead.
Check Modem Status
The most straightforward way to check the modem status is to use the command, “diagnose sys lte-modem
modem-details”. If the modem is working properly with the default configuration and recognized by FortiOS, the
following information should show up:
LTE Modem detailed information:
Modem detected: Yes
Manufacturer: Sierra Wireless, Incorporated
FortiGate-FortiWiFi 5.0 3G4G LTE Modem Operator's Manual 13
Fortinet Technologies Inc.
To Next Page
Loading...