Control Code Connections
The Control Code for Receivers, Code Followers/Responders,
Code Distributors, Code Translators, and other code-controlled
accessories is provided by Control Code Outputs in either the
AD1651B, AD1653B, or AD1655 bay. Accessories associated
with video inputs 1 through 64 are controlled by the Control
Code Output from AD1651B or AD1653B bays. Accessories
associated with video inputs 65 through 128 are controlled by
the Control Code Output from the AD1655 bay.
Control Code emanates from J1, a 12-pin connector, on the
back panels of the AD1603N Power Supply Modules of the
appropriate bays. A mating plug, with leads, is supplied.
Pinouts for the color-coded leads on this connector and the
corresponding equipment terminal identifications are:
J1 JACK
LEAD
EQUIPMENT
PIN NO.
COLOR
TERMINAL
1
White
W
4
Black
B
7
Shield
S
Connections are made by connecting the appropriate signal
wires from the J1 plug to the unit’s B/W/S terminals.
• Connect the Black Code wire to the terminal marked B.
• Connect the White Code wire to the terminal marked W.
• Connect the cable Shield to the terminal marked S.
Control Code Lines must be 18-AWG, shielded, two-wire,
twisted pair, Belden 8760 or equivalent (for plenum use
Belden 88760 or equivalent). Control Code Lines are NEC
Class 2, low voltage circuits. Where local codes permit,
installation in conduit is not required. Avoid installation near
high voltage circuits or other potential interference sources.
A maximum of three code-controlled units may be “Daisy
Chained” on one Control Code Line as shown in Figure 2-1.
The maximum code line length is 5000 feet (1500m). A 120-
ohm termination must be provided at the last piece of
equipment on each Code line.
If additional equipment are required with a Control Code
Output or if longer distances are involved, Code Distribution
Units must be used as shown in Figure 2-2. Each AD1691
Code Distribution Unit provides 64 Control Code outputs from
a single Control Code input. A 120-ohm termination must be
provided at the last equipment on each code output line.
For connection of code-controlled accessories (receivers,
followers/responders, translators, code distribution units) refer
to the installation manual included with each device.
Refer to the Typical System Connections, page C-5, at the end
of this manual, for illustration of Control Code connections.
* 120-Ohm Termination
Receiver
W
B
S
Receiver
W
B
S
Receiver
W
B
S
*
AD1650B
W
B
S
AD1650B
Code Distribution Unit
* 120-Ohm Termination
Other
Receivers
Receiver
*
W
B
S
Receiver
*
W
B
S
Receiver
*
W
B
S
W B S W
B S
W
B S
W B S
W B S
Figure 2-1 - Control Code “Daisy Chain” Connections
Figure 2-2 - Use of Code Distribution Unit
AD1650B
SYSTEM INSTALLATION
2-3
