Changing the serial baud rate of BT5701 adapter by AT command

Support

1,  Connect BT5701 to Windows XP/7/8/10 desktop or laptop PC via a RS232 female to female cable which the internal wire connection is 2-3 crossed, this cable can be purchased from electronic market. (If there isn't RS232 DB9 port on your PC, please buy a USB to RS232 cable to add a DB9 serial port)
If you can't buy a 2-3 crossed RS232 cable, you can connect two DB9 male port by jump wire according to the following picture.






2, Turn on BT5701 adapter, the blue LED will blink (not connected to other device), open Serial Port Tester software(click here to download), choose the correct com port number which BT5701 was connected, make sure the software COM port setting is same as BT5701 default setting(9600,N,8,1), please refer to the following snap picture.




3, Click Port, then Open to open Com port. Type testing command AT in data input area, the upper window will get return message OK. Type AT+BAUD8, the upper window will get return message OK115200, the baud rate of BT5701 adapter is changed to 115200 bps.