This paper introduces an intelligent data bus fire alarm system by microcomputer control.
介绍了由微型计算机控制的应用智能型数据总线的智能防火系统。
Its character is that the DDFS is linked to a microcomputer bus through buffer driver to control frequency and phase. The necessary hardware and software are designed.
重点讨论了微机控制部分，其特点是把DDFS经缓冲驱动器直接挂到微机总线上，以实现频率与相位控制，设计了全部硬件和软件。
Railroad car is single section car, so microcomputer network system adopts two-stage control, does not have to adopt intricate Train-Bus that adopted by organize into groups car.
有轨电车为单节车辆，微机网络系统采用二级控制，不必采用编组运行车辆所采用的较复杂的列车总线。
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