Lighting Impulse Breakdown of Cylindrical Coaxial Gaps in Nitrogen

A data communication system for an electrophotographic type reproduction machine or copier having a master unit, an interface, and one or more remote units. The master unit includes a programmable controller having a data processor, memory storage for storing programs and command and data bytes, and address and data buses. The interface is connected to the master unit via the address and data buses, and includes a memory connected to the data bus for temporarily storing command and output data bytes from the master unit pending transmittal thereof to the remote units and for storing input data bytes from the remote units pending transfer thereof to the master unit. A first communication path, along which command and data bytes from the interface memory are transmitted to the remote units, couples the interface with the remote units. A second communication path, along which input data bytes from the remote units to the interface memory are transmitted, couples the remote units with the interface.