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IX.
Common Questions
1.
How to send AT command?
The steps are as follows:
Select a serial port communication software (such as super terminal or serial debugging assistant)
to open the connected serial port. The serial port parameters in the parameter setting state are
always configured as 9600bps, 8-n-1, and are independent of the serial port parameters of data
communication set by AT command.
Press the switch button to enable the device to enter the parameter setting state. The flashing
indicator light is off. The serial port should receive "+OPEN: x\r\n", x is the number of devices
remembered. At this time, the instruction can be sent. It should be noted that all the instructions
end with the carriage return line character "\r\n". All instructions will return "\r\nOK\ n" after
