An adapter is provided as an interface between a raster output scanning printer and an electronic image processor which formats digital information for use by the printer in creating printed images. The adapter accepts digital pulses through a structured array of communication lines from the electronic image processor. Each line is dedicated to the provision of certain video or control information which may be utilized by any one of a number of different raster output scanning printers. The electronic image processor is indifferent to the identity of the type of printer to which information is provided as the adapter serves to manipulate the data provided by the electronic image processor in a manner suitable to control the particular printer employed. The adapter is sensitive to the scanning cycles of the printer and accommodates deviations in scan time to increase or decrease the rate of provision of video information in accordance with fluctuations in printer motor speed. A phase lock loop with the printer motor is provided for this purpose. The adapter also multiplexes status information of operating conditions generated internally and from the printer, and serially sends this status information to the electronic image processor.