I just picked up a Mutoh XP 510R pen plotter for pretty cheap. I've got it to do a test print from the lcd console on the plotter. When I try to get it interfaced with my computer Windows XP, I plug in my serial cable to my lpt1 port and in the back of the plotter. On the plotters LCD screen it displays Err Onl Frame. I've installed the Windows XP drivers for this series and I'm pretty sure I have all the settings correct. Anyone have any idea how to fix this error or know anything about it? Is the plotters interface shot?