Daktronics 4000 Series Digital Billboard - Manual (Page 41)

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Lanyard Attachment Ring: a ring found on the back of each module near the latch release on the
back of the module. The lanyard attaches to the ring and prevents the module from falling.
Latch Release: device that holds the module firmly to the display frame. There are two per module,
one on the top and one on the bottom.
Light Emitting Diode (LED): low energy, high intensity lighting unit.
Line Filter (Z-Filter): device that removes electromagnetic noise that might interfere with local
communication channels from the power system. In the 4000 series digital billboards, line filters are
mounted next to the termination panel.
Louver: a black plastic shade positioned horizontally above each pixel row. Louvers increase the
contrast level on the display face and direct LED light for easier viewing.
Module: consists of a display panel with LEDs, a driver board or logic card, a black plastic housing,
module latch assemblies, and a louver. Each module is individually removable either from the front
or back of the display.
Module Latch: an assembly using a rotating retainer bar to hold the module firmly to the display
frame. There are two per module, one near the top and one near the bottom.
ProLink Router (PLR): the PLR takes data in and then routes that data to other areas in the sign.
There is typically one PLR per display section.
Power Supply: device that receives AC line voltage at its power distribution board, and then supplies
DC voltage to modules and other internal components. One power supply may power several
modules and internal components.
SATA Cable: Serial Advanced Technology Attachment (SATA) allows high-speed signal from
module to module.
Termination Block: an electrical connection point, usually used to connect internal power and signal
wires to wires of the same type coming into the display from an external source.