This host service system is interfaced with the rs - 422 technology . the pc is the center of the communication system 程序设计仂议规定了?个以pc机为主机的分布式控制系统。
2.
It sends digital signals based on dmx512 . pci bus is the data - transporting media between cpu and single - chip computer . at present , there are several kinds of schemes for the pci bus and the peripheral circuit ( 2 )设计以pci总线为cpu和负责处理dmx512仂，议数据的单片机之间数据传输媒介的数据通讯卡，研究pci总线的有关特点，比较各种pci接口方案的优缺点，结合实际选出一种切实可行的方案。
