论文部分内容阅读
本文介绍了微计算机之间的远距离通讯问题、单板机串行通讯口的扩展方法;讨论了TRS-80微机系统在扩展中断方式2的基础上,实现与多远程终端的串行通讯问题;还讨论了数字信息基带传输的长线驱动与长线接收技术。这样,远距离通讯不仅通过无线信道和有线调制/解调信道可以实现,而且通过双绞屏蔽线进行基带传输也可以实现,这就为构成区域分布式系统和计算机网络打下了基础。本文所涉及的实用系统已在20公里范围内通过无线、有线及长线基带这三种信道都试验成功,工作稳定可靠。
This article describes the long-distance communication between microcomputers, single-board serial communication port expansion method; discusses the TRS-80 microcomputer system expansion interrupt mode 2, based on the realization of multi-remote terminals and serial communication problems ; Also discussed the long-term digital baseband transmission and long-term transmission technology. In this way, long-distance communication can be achieved not only by wireless channels and by cable modem / demodulation channels, but also by baseband transmission by twisted-pair shielded cables, laying the groundwork for forming regional distributed systems and computer networks. The practical system involved in this paper has been successfully tested in three channels of wireless, wired and long-term baseband within a range of 20 km, and the work is stable and reliable.