由于世界各国电子计算机名目繁多,它们所带的外部、外围设备亦不断增加,在计算机系统里便出现了“通讯接口”问题,所谓“通讯”,乃是指计算机与外部,外围设备或计算机间信息交互的统一,规正化和约定,而“接口”则是解决这个信息交互问题的硬(软)件手段。图(一)是一个包括“通讯接口”的计算机分布式控制系统的简图。以系统的观点,它们相互的通讯可以用二种方式——“串联”的方式和“并联”的方式进行。对照图(1)所谓“串联”是表示 Due to the variety of electronic computers in the world, the external and peripheral devices they bring are also increasing. In the computer system, there arises a problem of “communication interface”. The so-called “communication” means the connection between a computer and an external device, peripheral device, or computer Information integration, standardization and conventions, and “interface” is the hard (soft) means to solve this information exchange problem. Figure (a) is a simplified diagram of a computer distributed control system that includes a “communication interface.” From a system point of view, their mutual communication can be done in two ways - “in-line” and “parallel”. Control Figure (1) The so-called “series” is that