The serial data stream from the DOUT pin has a channel identifier bit and a mode identifier bit, which provide information about the channel converted and the current mode of operation.
DOUT引脚的串行数据流有一个通道识别位和一个模式识别位，可提供所转换通道和当前工作模式的相关信息。
RFCOMM is better when you want to send and receive stream data (and when you'd like to take a traditional serial port application and Bluetooth-enable it).
如果想发送和接收流数据（而且想采用传统的串口应用程序，并给它加上蓝牙支持），那么 RFCOMM更好。
However, RFCOMM is the better choice when you want to send and receive stream data, just like you would with a traditional serial port.
但是，如果想发送和接收流数据，则RFCOMM是更好的选择，就像使用传统的串口一样。
However, RFCOMM is the better choice when you want to send and receive stream data, just like you would with a traditional serial port.
但是，如果想发送和接收流数据，则RFCOMM是更好的选择，就像使用传统的串口一样。
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