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ControlMatrix User’s Guide - Installation Reference
Alternative 1 - CA485 Network less than 50m diameter
Network Devices
(PCU, SVC,SCP)
CAB8i or 16i
CA 485 network
For individual 'small' networks
where devices are close to a
CAB8i or 16i, it is possble to
create a network with either
star or daisy chain topology,
or a combination of both.
CA 485 network
The maximum length of any
arm must be less than 25m
from the CAB to the farthest
device.
CA 485 network
Figure 8-1: “Star” Configuration - Small Networks only. For individual 'small'
networks where devices are close to a CAB, it is possible to create a network
with either star or daisy chain topology, or a combination of both. The
maximum length of any arm must be less than 25 metres (75 feet) from the
CAB to the farthest device.
Alternative 2 - CA485 Network less than 600m diameter
Network Devices
(PCU, SVC,SCP)
CAB8i or 16i
For individual 'large' networks
where devices are distant from
a CAB8i or 16i, the network
must be constructed in a daisy
chain topology.
< 6m
CA 485 network
The maximum length of any
network must be less than
600m from the CAB to the
furthest device, and the total
length of any arm of the
network must be less than 6m.
Figure 8-2: “Daisy Chain” Configuration - Large Networks. For individual
'large' networks, where devices are distant from a CAB, the network must be
constructed in a daisy chain topology. The maximum length of any network
must be less than 600 metres (1800 feet) from the CAB to the furthest device,
and the total length of any arm of the network must be less than 6 metres (18
feet). Note also that the CAB may be located near the centre of such a network
providing the difference in length of the 2 arms is less than 12 metres.
8.2.3
Power Distribution
All CA485 devices are powered from external low voltage supplies. For PCU
paging stations, the power supply is + and - 15VDC and a three-conductor
cable is required. These power cables should be less than 300metres (900
feet), and 16 ga. wires are recommended for long cable runs.
 Creative Audio, V3.01, July 2003
Page 120