说明：  BLK-MD-SPP-A蓝牙模块AT命令集。用户可以通过串口和BLK-MD-SPP-A芯片进行通信，串口使用Tx, Rx两根信号线，波特率支持1200,2400,4800,9600,14400,19200,38400,57600,115200,230400,460800和921600bps。串口缺省波特率为38400bps.
(BLK-MD-SPP-A Bluetooth module AT command set. Users can communicate through the serial port and BLK-MD-SPP-A chip, serial port TX, RX two signal lines, the baud rate support and 120024004800960014400192003840057600115200230400460800 921600bps. The default serial baud rate is 38400bps.)