每次执行这个操作可以发送至多250个字符。在字符没有全部发送之前或没有超时发生，操作一直进行(例如，如果硬件流控制一-直被使用，远程设备从不激活发送功能)。这个功能使–个或-一个以上的字符从指定端口被读出
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