User's Manual

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being sent and received correctly. If "\r\ ror \r\n" is returned, please check if it is sent correctly. For
example: send test instruction AT\r\n, should send the 4 bytes of 'A' 'T' '\n'. Return to "\r\nOK\ n"
after receiving bluetooth correctly.
2. How to connect the target Bluetooth device when there are multiple
Bluetooth devices around?
Enter parameter setting mode and send AT+INQ instruction to get information of all Bluetooth
devices around.
Finds the specified Bluetooth address bdaddr through the device name in INQRESULT;
Send AT+RADDR=bdaddr,addrtype to record this device information. The addrtype here needs to
be consistent with INQRESULT, which is generally 0 (Public type).
Send AT+BIND=1 instruction to BIND this device;
Send AT+ROLE=1 to set the master device;
After exiting the parameter setting mode, the serial port adapter will actively connect to the
specified Bluetooth device
3. 2pcs BLE adapters can not connect.
Enter the parameter setting status Inquire to confirm whether the two devices are a setting master
device, a setting as slave device, and whether the master device has memorized the address of
other Bluetooth devices. If the master has memorized the addresses of other devices, clear them
and resend AT+RADDR to record the current address from the device.