Printer control device to enable printing on selected multiple types of

Abstract

A printer control device is employed with host computer controlled printers, typically of the point-of-sale (POS) type, which are capable of printing on several different types of recording paper. Several detectors are used on the printer to sense out-of-paper conditions with at least one detector being associated with each paper source used, and a detector selection device is used to determine which detector outputs are to be connected to the host computer through a communications interface. Detector output values can be stored and logically combined to allow transfer over a single communications line. Specific detector outputs can be enabled or selected for transfer to the host or for use in termination of printing operations. A paper type selector is used for setting line spacing or advancement amounts which are stored by the printer controller for later retrieval. Typically each advancement value relative to one type of paper is stored separately in a memory location or element. The type of recording paper and line advancement value for that paper are each selected by a printer control command, which is interpreted and acted upon by the printer controller. The printer controller responds to data printing commands and activates paper transfer mechanisms within the printer to achieve the established line advancement values during printing operations.