System information

104
Remote Control Bus
Remote Control Bus provides the connection for V8, S8, VS8, and Voltage Command Box external
control devices.
Each E Desk device can support any combination of the controls mentioned above. Up to 32 controls
may be connected to each E Desk device, on a daisy-chain 'network', with a maximum cable length of
1000 feet (300 meters). 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 UNC220 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 E Desk device at one end, and a control device at the other end,
creating one continuous run. In this case, the E Desk 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 E Desk 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 E Desk 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 E Desk 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 E Desk device), between the two end controls, would have their 'term' switches released
(out) or jumpers removed. (See network diagrams below.)