RS - 485的三态能力允许以半双工通讯的方式分享传送和接收信号的一对导线。

The tristate capabilities of RS-485 allow a single pair of wires to share transmit and receive signals for half-duplex communications.

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这是幸运的，因为大多数RF路径是双工(双向)通道需要的信号从天线到前端(接收模式)和功率放大器天线(发射模式)。

This is fortunate, since most RF paths are duplex (bidirectional) channels with a need for signals to go from antenna to front end (receive mode) and from power amplifier to antenna (transmit mode).

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本文介绍了利用VHDL语言设计出全双工异步接收发送器电路的方法，并通过计算机仿真和实验证明了设计的正确性。

In this paper, the design of full duplex UART base on VHDL is thoroughly discussed. And the exactitude of this design has been proved by means of computer simulation and experiment.

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