I have a EG25-G EXVIST testboard with USB and TTL i/f (4G LTE USB Dongle in Mexico, Kuwait, Italy - EXVIST Official Store)
I’m successfully able to connect and send AT commands via /dev/ttyUSB2 when I connect over USB directly. However, I would like to integrate the board with an MCU and will need to use the UART interface for AT commands. To test if the TTL works, I used a FTDI USB to TTL cable to connect the testboard’s TTL over a serial USB cable and tried to send basic AT commands over minicom.
However, I do not get any response from the device. Am I missing something here, as I understand the main UART is for AT commands and should be straightforward.
- I used the default baudrate of 115200 for the USB to TTL cable connection over minicom that is detected as /dev/ttyUSB0
- I do not receive any response from the device for the basic commands like AT or ATI.
Do i need a special driver to start using the testboard via the UART? instead of USB. Also, i would like to do the UART development for AT interface for the MCU, where can I find the reference code for the same?
Anyhelp is much appreciated. Thank you!