Communication with the Printer Note The Copy Connect EIO is essentially a pass through device. M Data is handed from the Copy Connect EIO to the Scanner Service Agent (SSA), which is part of the copy module firmware that runs in the printer’s RAM and shows Loading Program 1 on the printer’s Front Panel when loaded successfully. M The copy module firmware adds several Printer Job Language (PJL) control codes to set resolution, printer language and page layout. G The data stream goes around the printer’s normal image processing system directly into page memory. This allows for the high speed at which copied pages can be printed. Communication Channels G Image data:
high speed uni-directional 1394 channel G All other communications: bidirectional 1394 channel Print Job Interrupt There are two levels at which a user can interrupt a network print job to make a copy on the copy module: G Low priority - when you place a document in the ADF or touch any of the buttons on the copy module, all incoming network jobs are held until the copy module is finished copying. G High priority - Select J OB I NTERRUPT on the touch screen. The current mopy job is interrupted at the copy boundary. For instance, if the printer is printing copy 3 of 5, it will finish copy 3 and hold copies 4 and 5 until the copy module is finished copying.
C4265-90907 Communication with the Printer 251