American Dynamics Excalibur 168, Installation And Service Manual

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INSTALLATION
MP168 Video Switcher/Controller System
Star Configuration
A star configuration refers to hardwiring one
Manchester output to a Control Code distribution unit
(see Figure 2-5). A typical Control Code distribution
device expands the number of Receiver/Driver Units
(RDUs) on one code line to 64 RDUs.
In a star configuration, one AD Manchester Control
Code line connects one Control Code Distributor to the
Control Code Module. The MP168 Bay considers this
connection a “group” of Receiver/Driver Units.
For addressing purposes, group connections to the
Control Code module should be planned as follows:
Manchester output number 1 (the upper most
port) is for RDU numbers 1 through 64.
Manchester output 2 (the center port) is for RDU
numbers 65 through 128.
Manchester output 3 (the lower port) is for RDU
numbers 129 through 192.
Each unit must be terminated with a 120-ohm resistor
that provides a low impedance termination between the
module and the code distribution unit.
B W S B W S B W S
B W S
Figure 2-5 - Manchester Star Configuration
Pan/Tilt/Zoom Unit
Connector Plug
Manchester Code Output #2 - RDUs 65-128
Manchester Code Output #3 - RDUs 129-192
Manchester Code Output #1 - RDUs 1-64
18AWG shielded, 2-wire,
twisted pair cable (Belden
8760 or equivalent
Receiver/Driver Unit (RDU)
AD1691 Manchester
Code Distributor
(supports up to 64
Receiver/Driver Units)
2-9