The paper describes the design and practical implementation of a measuring and digital computer interface system for an electrostatic precipitator (ESP) filter used in a large cement factory. The objective is to develop a digital computer control system to replace an old analog controller for the ESP filter mounted on a cement production rotary kiln inside the National Cement Company. The main concern is to develop a modern technology for a real ESP controller designed and implemented locally in Egypt. The first phase of this research project is described in this paper. The computer interface system is developed to facilitate measurements of voltages and currents at both low voltage and high voltage sides of the transformer/rectifier power circuit of the high voltage unit in the EPS. Hardware, software, electronic circuits and interface systems are described. Practical results of the real precipitator filter are presented to show the validity of the designed system.