Generalized interface handler and multi-tasking operation in MS/DOS for PC-based SCADA system

Abstract This paper describes a generalized interface handler implemented on a PC-based SCADA system which can handle up to a total of 512 digital points and 512 analog points. It is aimed to provide a standard structure for SCADA application program to be independent from the interfacing hardware. Using the same data structure, a multi-tasking operation has also been implemented under the single-tasking operating system MS/DOS. The prototype SCADA system employing four different types of hardware interface is demonstrated.