Testing At Commands - Neoway N720 User Manual

N720 User Manual (Linux)
3. Configure kernel.
Device Drivers --->
[*] USB support --->
<*> USB Serial Converter support --->
<*> USB driver for GSM and CDMA modems （CONFIG_USB_SERIAL_OPTION=y）
4. Click Save and Exit.
5. Compile kernel again and burn the compiled kernel files to the host.
6. Power up the host again and execute ls /dev/ttyUSB*.
If N720 is loaded successfully, ttyUSB0 to ttyUSBx are listed under /dev. Two ttyUSB ports can be used
to send AT commands. One is used as modem port and the other one is used as AT port.
For example, ttyUSB0 and ttyUSB2 in the above figure can be used to send AT commands. ttyUSB0 is the
modem port and ttyUSB2 is the AT port.
If ttyUSB0 to ttyUSB4 are displayed and ttyUSB0 and ttyUSB2 can be used to send AT commands,
ttyUSB0 is the modem port and ttyUSB2 is the AT port. If ttyUSB0 cannot be used to send AT commands,
ttyUSB2 and ttyUSB4 can be used to send AT commands. ttyUSB2 is the modem port and ttyUSB4 is the
AT port.

2.4 Testing AT Commands

1. Power up the host.
2. Execute ls /dev/ttyUSB* to check whether N720 is identified and whether ttyUSB are listed.
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