本文主要介紹了如何開發基于TCP/IP 協議網絡編程的自定義通訊協議，在QNX，Linux 和Windows 三種不同的操作系統平臺下實現多節點間的互相通訊。測試結果表明，該協議可以方便高效地實現多平臺下控制節點間的相互通訊，并且在長時間、高頻率的通訊過程中，具有良好的實時性和可靠性。
[關鍵詞] 協議棧 QNX Linux Windows socket 通訊

Study and development of the User Defined Protocol Based on TCP/IP Jiang Min1,2 Shan Jiangfang1 Kong Jun2 1（Institute of Plasma Physics, Chinese Academy of Sciences, Hefei Anhui, 230031） 2（Southern Yangtze University, Wuxi Jiangsu, 214125） [Abstract]This paper mainly presents how to communicate between QNX，Linux and Windows with a user-defined protocol based on TCP/IP protocol. Some results of the experiment are gained to show that it is quite easy to construct a rapid and stable communication with long time and high frequency between different operating
systems .
[key word] protocol Stack, QNX, Linux, Windows, socket, communication