操作注意事项;对于CPU端口2(RS-485),RTS信号也受发送驱动器控制。因此，RTS的控制由发送驱动器的当前状态决定。如果发送驱动器不激活，在串行线上，带有写端口控制COMM_ REQ的坚持RTS将使RTS不被坚持。发送驱动器的状态受协议控制，由当前端口的双向模式决定。对于2线或4线双向模式，发送驱动器只有在发送期间被激活。

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