The LightProcessor Rack- and Truss-Mounting Buffers are functionally identical.
Both products split, isolate, buffer and boost incoming DMX signals to four 1kV opto-isolated output
channels. See Fig. 8. They are designed to protect against DMX line faults, incorrect connection and earth
loops. Additionally they offer a means of Y-splitting a DMX signal and boosting DMX signals in very long
cable runs.
Each output channel comprises one 5-pin XLR output and one 3-pin XLR connector. (Products with eight
5-pin XLRs or eight 3-pin XLRs are available to order). Since each of the output connectors is
independently driven, all eight outputs may be used.
INSTALLATION
Verify the Buffer's operating voltage before mounting. The truss mounting version should be mounted to
the truss/structure using a hook clamp attached to the M10 bolt on its top face. A suitable safety chain
should be passed around the truss/structure and through the safety loop on the Buffer.
Before installing the rackmounting version set its operating voltage, using the rear panel voltage selector
switch. The mains cable enters through the rear panel.
Both devices are supplied fitted with one metre of mains cable for connection to a suitable mains supply of
16A maximum.
The truss mounting version’s input and through DMX connections are made to the left hand side. The
outputs are on the bottom. For the rackmounting version all connections are made via the front panel.
The main DMX chain is connected via the 5-pin XLR input and through connectors, thus providing a signal
input to the Buffer and a loop out to the next DMX device in the chain. If the Buffer is the last device in the
DMX chain, the line should be terminated by pressing the DMX line termination switch.
Connect the devices to be protected to the output connectors. Note that up to eight devices may be
connected but that only four channels of opto-isolation are provided.
OPERATION
The input and through connectors are linked when the unit is not powered. When the unit is powered up a
relay switches a buffer in between the input and through connectors.
Each output channel is fitted with a red and a green LED. These LEDs mimic the activity of the data true
and data invert DMX lines and flash rapidly during normal operation. Absence of this flashing in one LED
indicates a fault on that line. No flashing of either LED probably indicates an absence of DMX.
LightProcessor DMX Tools, April 2003
Page 13
Buffer, Rack and Truss-mounting
