The operational principle and related problems of LXI bus discovery mechanism based on VXI-11 protocol are analyzed, and the principle of zero configuration network protocol is researched. In accordance with the rules of LXI standard, and on the basis of mDNS/DNS-SD protocol, the LXI instrument zero configuration discovery mechanism is designed and implemented on the S3C2440 embedded Linux system platform. The test indicates that the implementation of this mechanism solves the problems of the VXI-11 discovery mechanism based on ONC-RPC protocol, e. g. , slow speed, quantity limitation of devices, etc. , and implements the active discovery mechanism of instrumentation.%分析了基于VXI- 11协议实现的LXI总线发现机制的工作原理及其存在的问题,研究了零配置网络协议的原理.按照LXI标准的规定,基于mDNS/DNS-SD协议,在S3C2440的嵌入式Linux系统平台上设计实现了LXI仪器零配置发现机制.试验表明,这种零配置发现机制的实现,解决了基于ONC-RPC协议的VXI-11发现机制中存在的发现速度慢、设备数量受限等问题,实现了仪器的主动发现机制.
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