User Manual

7 AT instruction
(Note: Sending the command needs to return the line and return the AT
command to return the line)
7.1，Enter into AT instruction mode
Serial
port
Format
Note
Send
+++
The start and end byte of a frame must be with a
ending with three consecutive ‘+’+"\r\n", send a
character ‘a’ between10ms to 1s
Send
a
The 'a' must end with the frame start byte + "\ r \ n" and
if the + + 'character is not received in module 1S, the' +
+ +'is issued as a data transmission
Return
AT+ENAT=OK
Enter into command mode
7.2, Set the serial port rate
Note: After this step, the serial port returns OK or ERR,MCU according to the
previous port rate and check bit to synchronously initialize the corresponding port rate
and check bit after receiving the successful set up command.
Serial
port
Format
Note
Send
AT+BAUD=9600,0
2400、4800、9600、14400、19200、
38400(default)、57600、115200
optional
0-No check bit（default）
1-Check odd
2-Check even
Return
AT+BAUD=OK
Correct return
AT+BAUD=ERR
Wrong return
Send
AT+BAUD=?
Inquiry
Return
AT+BAUD=9600,0
7.3, Set the Lora frequency interval
Serial
port
Format
Note
Send
AT+FREQ=4400
470Mhz span：4300~5100
868Mhz(for EU) span：8600~9200
Default； 4400
Return
AT+FREQ=OK
Correct return
AT+FREQ=ERR
Wrong return
Send
AT+FREQ=?
Inquiry
Return
AT+FREQ=4400