前几讲叙述了VXI总线的系统结构,在这一讲中将介绍VXI总线器件的设计规则。这将便于制造者之间进行器件的互换,与在系统结构中的定义相比,仪器协议是在更高层次定义的。一种通用器件是VXI总线到IEEE488总线的接口,这个器件可以使VXI总线器件通过IEEE488总线进行控制,好象它们是IEEE488器件一样。在本讲座中,将给出一个这样的接口:它的VXI总线协议及仪器对于该接口的要求。它的VXI总线协议还准备扩展以便为其它的接口和命令者所使用。 The first few talked about the VXI bus system architecture, in this talk will introduce the design rules VXI bus devices. This will facilitate device interchanging between manufacturers, which is defined at a higher level than the definition in the system architecture. A common device is the VXI bus interface to the IEEE488 bus, which allows VXI bus devices to be controlled via the IEEE488 bus as if they were IEEE 488 devices. In this lecture, one such interface will be given: its VXI bus protocol and its requirements for this interface. Its VXI bus protocol is also ready to be extended for use by other interfaces and command operators.