摘要
LXI是仪器总线在局域网上的应用,由于其具有物理接口稳定、传输速度快、触发方式灵活、易升级等特点,被业内公认为是下一代测试总线。在方便实现测试系统与因特网相连完成远程测试和控制的同时,如何保证测试过程的安全可靠,以及LXI中基于LAN的触发方式的实现,是组建测试系统必须考虑的问题。本文以此为出发点研究了包括直连、路由器隔离、PC隔离及基于边界时钟在内的几种常见的LXI测试系统拓扑结构,并分析了其各自的特点和使用环境;对测试系统组建中需运用的包括如TCP/IP、UDP协议以及NAT、VPN、DHCP、DNS等关键技术也进行了探讨。
LXI is the LAN extension for instrument bus, and it is regarded as the test bus of the next generation due to its superiority on stable physical interface, high speed transmission, flexible triggering mode and convenient upgrade. While implementing the convenient connecting with testing system and internet to realize the remote testing and controlling, two aspects of concerned issue must be taken into account when constituting the testing system They are how to guarantee the safety and reliability of the testing process and the realization of triggering mode based on LAN in LXI, on which basis we study the topology of direct connecting structure, router isolating structure, PC isolating structure and boundary clock based structure, and analyse the characters and using occasion of all these structures Finally we discuss two important communication protocols TCP/IP and UDP, and interrelated net technologies such as NAT, VPN, DHCP, DNS.
出处
《电子测量技术》
2007年第11期126-128,138,共4页
Electronic Measurement Technology
