本文介绍了自由空间光通信终端机中ATP系统的工作原理，详细论述了实现ATP系统功能的硬件和软件的设计，并给出了该系统性能测试的结果。
The work principle of ATP is introduced, the design of hardware and software of ATP system is described in detail, the experiment results of the ATP system is presented.
当k TF被连接到聪明的KTF终端机的时候，这个功能能被用或到机器的计算机经由rs485通信埠。
This function can be used when the KTF is connected to the SMART KTF terminal or to the machine's computer via the RS485 communication port.
电传打字电报：国际性的直拨电话通信设施，它用电传打字机为终端机，以每秒50数元，传送波德代码，即每分钟600字。
Telex: An international dial-up communications service that uses teleprinters for terminals and transmits Baudot code at 50bits per second, or 600 words per minute.
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