Electrical Installation
3-3
3.2 Control Cable Requirements
RS232
A quick connect cable for an RS232 display will connect from the communication
enclosure to the display. The quick connect cable is provided by Daktronics.
RS422
This cable is a 4-conductor shielded cable used to transmit an RS422 signal
(Daktronics part number W-1234). This shielded cable consists of paired wires. They
should not be subjected to mechanical flexing after installation. This cable is not for
direct burial and should have one of the following routings:
•
In dedicated, metallic conduit
•
Inside buildings – if cable is not in conduit, keep away from interference
signals.
With interference signals, such as power conductors, intercom, etc., typically a two-
foot separation is required. The maximum length of an RS422 signal cable is 4,000
feet (1.22km) from the signal converter to the enclosure at the display.
Modem
The modem option will use a standard telephone cable routed through conduit. The
local telephone company will need to assist in this installation. Ask the telephone
company which colors are used for the TIP wire and the RING wire for signal
connections to the modem enclosure at the display.
Note:
The telephone lines must be dedicated lines, and
not
run through a switch
board/communications system.
Fiber Optic
This cable is a 4-fiber cable (Daktronics part number W-1376). Two fibers are used
for display communications and the other two are saved for spares. The cable may be
either direct burial or in conduit, but it should
not
be subjected to mechanical
flexing. The maximum length of a fiber optic cable is 2,000 feet (611.6 meters) from
the signal converter to the fiber enclosure at the display.
Radio
The Server radio connected to the computer requires an 18-gauge six-conductor
cable (Daktronics part number W-1370). Four-conductors will be used for the signal
and two for the power. These wires need to be in conduit when exposed to outdoor
conditions to the Server radio. The maximum distance from the J-box by the
computer and the Server radio is 1,000 feet (305.8 meters).
The Client radio at the display comes with cable that is rated for outdoor use and
does not need to be in conduit. The cable should be secured to the structure to
prevent it from being pulled loose from the display.
