Biamp LTR - Manual (Page 200)

Audia-Manual-LTR
Remote Control Bus
Remote Control Bus provides the connection for Volume 8 , Select 8 , Volume/Select 8 , Voltage
Control Box , and Logic Box external control devices.
Each Audia® device can support any combination of the controls mentioned above. Up to 32
controls may be connected to each Audia device, on a daisy-chain 'network', with a maximum
cable length of 1000 feet (300 meters). A
Remote Control Bus Hub allows multiple branches on
a control network.
Cabling and power for an RCB network can be calculated using a program
(AudiaRCBCabling.hta) found under Program Files/Audia/Ultilities. Controls are wired in parallel
(pin-for-pin), using 5-conductor data grade cable (95~120 ohms nominal impedance; 16 pF/ft.
max. capacitance; 65% min. velocity of prop.).
Recommended cable: Gepco 18/22AXL, Liberty AXLINK, Liberty CRESNET, or equivalent
(use data pair for Hi & Lo; use power pair for + & -).
The 'network' requires termination at each 'end' for proper operation. All controls (and Audia)
include either a termination switch or jumper strap. These terminations should be disabled
(switch out or jumper removed) on all devices except those at the two extreme ends of the
network. (See wiring diagram below).
A control network may be wired with the Audia device at one end, and a control device at the
other end, creating one continuous run. In this case, the Audia device would have the 'term'
switch engaged (in), and the control device at the other end of the network would have the 'term'
switch engaged (in) or jumper installed. All other controls, between the Audia device and the last
control, would have their 'term' switches released (out) or jumpers removed.
If a control network needs to service two areas which are in opposite directions from the Audia
device, a network with two separate runs can be created. This type of network actually remains
as a single run, but is configured with the Audia device in the middle. Therefore, only the
controls at the two extreme ends of the network would have their 'term' switches engaged (in) or
jumpers installed. All other controls (including the Audia device), between the two end controls,
would have their 'term' switches released (out) or jumpers removed. (See network diagrams
below.)
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