Vantron VT-SBC-3399, Руководство пользователя

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VT-SBC-3399 | User Manual 29 www.vantrontech.com
3.4 Cellular Network
For boards that implement a cellular module, the module is powered up by default after
the system boots up. Therefore, users don’t need to power the board manually.
Insert the activated SIM card and wait for the loading of the USB driver to obtain the name
of the USB port:
# ls /dev/ttyUSB*
Taking EC20 for example, the functions of each port is explained as follows:
ttyUSB0 -> DIAG
ttyUSB1 -> GPS NMEA
ttyUSB2 -> AT
ttyUSB3 -> Modem
• AT control
Use a serial port communication program (e.g., minicom) to configure serial port
ttyUSB2 (only AT (ttyUSB2) and Modem (ttyUSB3) nodes of a serial port are used for
sending AT commands) to send AT commands.
1.
Send AT command via minicom for test;
# minicom -D /dev/ttyUSB2 -b 115200
2. In normal cases, the program will return the module information;