How can I use UART with Raspberry Pi 3G/4G&LTE Base HAT?

Raspberry Pi Network HATs 3G/4G&LTE Base HAT
7

Hi @ensar,
Thanks for your reply. I really think that I am doing something wrong… Those are the steps I do:

  1. Download and flash Raspbian Buster Lite image (https://www.raspberrypi.org/downloads/raspbian/) on the SD card.
  2. Add enable_uart=1 to /boot/config.txt
  3. Connect sixfab Base HAT on long headers to the RPi3 and connect UART to PC converter
  4. Login, enable SSH and to those step that you describe, reboot.
  5. After that I am not able to communicate with RPi through UART (as expected) so I plug out UART to PC converter
  6. Download minicom (sudo apt install minicom)
  7. Run minicom on ttyS0 (sudo minicom -D /dev/ttyS0) and disable Hardware Flow Control
  8. Try to type AT commands but nothing shows up on minicom.

Do I need to set some pins? Reset HAT or something like that?