Abstract: In complex systems which involve a large amount of interacting electronic equipment, the amount of interconnecting cabling and the attending cross-talk, electromechanical interference and other types of noise pickup become so significant that great expense and skill is required to design a system with satisfactory performance. The system of this invention includes new techniques for data exchange between components of such a complex system with the result that the cross-talk and interference problems are substantially eliminated, while at the same time, the amount of cabling required is reduced to a single communication path which includes only seven conductor pairs. The new system includes a master controller for converting parallel digital data from a computer to serial digital data which is transmitted to the using device through the communication path where it is then converted to a form suitable for the using device.