PD6000 Series Pole Display (Large Character 2-Line x 20-Character VFD with Pass-Through Feature, RS232 Interface, and DB9F/25M Connector) The PD6000 Series is a 2-line 20-character Pole Display that solve the classic I wish I had an extra I/O port problem, by using our data pass-through data capabilities. Logic Controls' data pass-through process allows connection of multiple pole displays, cash drawers, printers and other devices to a single output port. In the pass through mode, a pole display monitors the incoming data, then decides to display the data or pass it to the next down-stream device. Bright blue / green vacuum fluorescent characters are enhanced with an optical filter for better contrast and easier viewing. All standard Displays support moving sign advertisements during periods of inactivity with a single message download, eliminating constant application software refreshing.