PD3000 Pole Display (2 x 20 Display with RS232 Interface, Auto Scrolling, Mounting Plate, Manual, Power Adapter and 6 Foot Cable) - Color: Black The PD3000 is a two line twenty 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.