I apologize for being totally at the starting point here.
I attached my MC card to the dev board and connected that via USB. I have /dev/ttyUSB0-/dev/ttyUSB6, which showed up when the card connected.
I’ve tried opening each of these in cutecom at 115200 baud, 8 bits, 1 stop bit. I tried sending “ATI” to get info from the card.
None of the serial connections appear to be responding. Some of them hang, some of them don’t hang but don’t respond with any information.
All the documentation seems to assume that I know how to send AT commands. Am I doing it wrong? Is there a step I’m missing?