The singlehanded close communication protocol was used in DCS, standard communication protocol was used in FCS.

DCS采用独家封闭的通信协,FCS采用标准的通信协。

In many cases, the DCS was merely a digital replacement of the same functionality provided by analog controllers and a panelboard display.

情况下，直接数字控制仅仅是一种数字式替，它的功能同个模拟控制和一个面板显所提供的功能一样。