User's Manual

17
3.2 Cable Pulling
CAUTION: If you do not use the HME audio cable, be sure the speaker/microphone
wires you use are a twisted pair. For full-duplex installations, the speakers
and microphones must use separate cables or audio feedback will occur.
Never run high-voltage cables in the same conduit with audio or loop cables.
The recommended HME audio cable has four color-coded, insulated wires and a
bare shield (drain) wire. It can be used to connect any component to the base
station. Pull the cables (two for full-duplex, one for half-duplex) through the
conduit from the speaker post or menu board into the building as follows.
For dual drive-thru installations, repeat the following steps to route shielded cable
from inside the building to the speaker post or menu board in each lane.
For tandem drive-thru installations, repeat the following steps to route shielded
cable from inside the building to the speaker post or menu board at each order point.
 Run fish tape from inside the building, through the conduit to the speaker post or
menu board.
 Go outside. If you are pulling more than one cable, mark the cables and spools
for identification. Fasten each cable to the fish tape where it comes out of the
conduit, and go back inside the building.
 Pull the fish tape and cable through the conduit into the building. Disconnect the
cable from the fish tape and pull enough of it in to reach the base station.
 Go outside again and route the cable from the outside conduit to the speaker and
microphone units in the speaker post or menu board.
 Cut the cable, leaving about 3 feet (915 mm) of slack. If more than one cable have
been pulled, mark the ends of the cables again for identification.
 Remove about 2 inches (50 mm) of the outer insulation from the end of each cable.
Strip about ½ inch (12 mm) of insulation from each of the four wires in the cable.
 Route all the cables together to the base station, through walls and over ceiling
panels if possible. Cut off any slack cable so no coils of excess cable are left in the
ceiling or elsewhere.
3.3 Outside Speaker and Microphone Installation
and Cable Connections
This section describes standard, full-duplex installations, using a DM3 microphone
and SP2500LP Low-Profile Speaker. Installation requirements may vary. In dual-
lane or tandem systems, speakers and microphones must be installed for each lane
or order point. Refer to the wiring diagrams on pages 43 – 50.
Note: For half-duplex installations, the SP2000A Speaker/Microphone Unit is used.
See Section 3.4, page 20 for installation of the SP2000A.
In full-duplex systems the standard microphone and speaker provide the best
performance. However, in some cases the DM1 Microphone may be used. For DM1
installation, refer to the instructions enclosed with the unit. For either the DM1 or
DM3, refer to the appropriate wiring diagram on pages 43 – 50.
Mount the microphone first, against the speaker grill in the speaker post or menu
board. Positioned it where the customer will speak directly into it. The speaker can
then be installed anywhere around the microphone, as long as they are at least
2 feet (610 mm) apart, center-to-center, to avoid audio feedback.
Note: Try the system with the speaker at various locations around the microphone
before permanently mounting it. If feedback occurs, move around until the
feedback disappears. If possible, park a vehicle in front of the outside microphone
to simulate echo conditions that may also cause feedback.