telegraph communication

This paper gives a simple and practical telegram interface circuit.

介绍了一种简洁、实用的收发电报接口电路,很好地解决了电报终端的改造问题。

This paper first reviews the establishment of modern Chinese telecommunication, then discusses how telegram infulenced the political scene of the late Qing Dynasty, and especially indicates that it was the telegram which was used by revolutionists to oppose the Qing Dynasty.

通过回顾近代中国电讯业的创设,可以看出电报这种传媒手段在清末政治生活中的重要作用。

The paper introduces the transformation of DK7720B WEDM machine with telegraph terminal interface,realizing the communication between WEDM CNC system and the computer with CAXA software,so as to make full use of the merits of CAXA software and accomplish the upgrading of old equipments.

本文介绍一种利用电报头接口改造旧电火花线切割机床,通过CAXA软件实现线切割数控系统与计算机的通信,充分发挥CAXA绘图式自动编程软件的优点,实现旧设备的升级改造。