I am trying to send AT commands to my HL7800 module on my mangoh red board, but it is acting strange…
I have a TTL cable connected from my computer to pin 8 and pin 10, and USB going into CN305, GNSS and Cellular antennas and a LiPo connected.
If I send AT, some times it responds with OK, and some times it responds with ERROR or some strange characters.
My settings are 115200,N,8,1 with flow control turned off.
Lastly, If I connect the UART -> RS232 module into CN305, communicaitons work fine. Problems are only when using UART on pin 8/10.