American Dynamics AD1684B, Installation Instructions Manual

Page: 12 / 28

CONNECTIONS AD1684B
CONNECTIONS
Code Line Connections
The Code Line connection to the Receiver is made with user-
supplied, shielded 2-wire twisted pair, Belden 8760 or
equivalent (for Plenum use Belden 88760 or equivalent). The
maximum code line length is 5000 feet.
The code line connector, labeled J1, is located on the right side
of the unit (see Figure 1 page 2). The pin positions are marked
BLACK (black code wire), WHITE (white code wire) and
SHIELD (cable shield). A mating three-pin screw-terminal
connector is provided for plug-in to J1.
BEFORE STARTING:
1. Check power line to verify that the power is off.
2. Open the Receiver and find the Code terminal connector
located on the PCB (see Figure 1).
WIRING INSTRUCTIONS:
3. Pass the code wire through a bushing to the code connector
- do not tighten bushing.
4. Strip the ends of code wires, 1/4" (6mm) from the end.
5. Insert the BLACK CODE wire into the mating screw-
terminal connector pin location for BLACK.
6. Insert the WHITE CODE wire into the WHITE pin location.
7. Insert the cable shield into the SHIELD pin location.
8. Remove any excess cable and tighten the bushing.
9. Insert the screw-terminal connector into the J1 connector.
The Receiver has a 120-ohm terminating resistor installed on
the PCB and is designed for “Star” connection to a Code
Distribution Unit, illustrated in Figure 3.
A maximum of three AD1684B Receivers can be connected in
a “Daisy Chain” connection, as illustrated in Figure 4. If the
Receiver is to be connected in a Daisy Chain, the 120-ohm
terminating resistor must be removed from all but the last
Receiver. A 120-ohm termination must be provided on the last
piece of equipment on each code line.
The 120-ohm terminating resistor for the AD1684B is located
on the right side of the PCB, near the J1 connector, and is
designated R4 (see Figure 1, page 2).
The green Code LED on these Receivers (located on the left
side of the PCB, near the J7 connector) is lit when the unit is
receiving good code. A flickering Code LED indicates a
problem in the transmission of the code, poor or loose
connection, improper termination or defective Receiver.
Refer to the Typical System Connections illustrations, pages
C-2 and C-3, for Code Line connections.
6
Figure 3 - Code Line Star Connections
Figure 4 - Code Line Daisy Chain Connections
Code Distribution Unit
* 120-Ohm Termination
Other
Receivers
Receiver
*
Receiver
*
Receiver
*
W B S
W
B
S
W B S
W
B
S
W
B
S
W B S
* 120-Ohm Termination
Receiver
W B S
Receiver
W B S
Receiver
W B S
*
Code Source
W B S
CAUTION - Due to the presence of non-
insulated components with hazardous
voltages, the following internal adjustments
should be performed by qualified service
personnel only.
!