INSTALLING AN LED AS A PANEL LOCATOR LIGHT
If you wish an LED can be installed between the two front RJ-12
connectors on the panel to serve as a panel locator light. We
recommend using a T1 sized (.100 inch diameter) LED. Solder
the LED to the bottom of the PC board. Leave enough lead
length to bend the LED over and fit it through the hole in the
front panel. You will also need to solder a 1K ¼ watt resistor in
the two holes marked “1K”.
PROPER CAB BUS CABLING
The cables that connect the command station to the UTP and
from UTP to UTP must be wired “straight through” meaning Pin
1 of one connector must be connected to Pin 1 of the other
connector (see figures below). Please note that this is not the
normal telephone cable wiring.The normal wire gauge for RJ-12
cables is #28 or #26. This wire size is sufficient for cab bus
lengths of up to about 30 or 40 feet (10-13 meters).
If your layout requires a cab bus longer than this we suggest
adding extra power to the bus at about 30-40 foot intervals.
This is easily done by plugging a 12-14VDC power supply in to
the 5.5/2.5mm jack on the back of the UTP. The center pin is
positive (+) and the sleeve is negative. We recommend the
NCE P114 (p/n 5240221) or other power supply in the range of
12 to 14 volts DC with a capability of at least ½ to 1 Amp.
IMPORTANT: When adding a power supply to the UTP
you MUST cut the circuit trace marked with an “X” on
top of the circuit board.
