因此，当正在发送数据时，在串行线上的RTS只有在端口2(配置为2线或4线双向模式).上才看到激活。对于点对点双向模式，发送驱动器总是激活的。因此，在点对点双向模式里，在串行线上的RTS将总是反映用写端口控制COMM_ _REQ选择了什么。这个功能可以用来通过指定串口向远程设备发送-一个或更多的字符。被发送的字符必须在字基准存储器里。操作完成之前字符不应该被改变。

 

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