Send At Command; Faq - Feasycom FSC-BP301 Serial Instruction Manual

4.2.3 Send AT command

Start the serial port tools, select the physical serial port number to connect with the computer,
set the baud rate and other parameters of the serial port to keep it consistent with the Bluetooth
serial port parameters of the FSC-BP301 (default 115200, N, 8, 1), and then "open serial port".
Send test command AT, if it returns OK, it means that the AT command debugging environment is
established, and you can send other AT commands to set FSC-BP301. For detailed instructions,
please refer to the <FSC-BT8X6 Programming User Guide V3.1(Universal).pdf> document.

5. FAQ

Q: I use the Feasycom serial port tools to debug FSC-BP301, why couldn't it return OK after
sending the AT test command?
Answer: It is probably that the serial port parameter selection is incorrect, please check the
parameters of serial port number, baud rate, data bit, stop bit, check method, etc. It is also
possible that the HEX transmission or display is selected by mistake, or the serial port is not
opened.