User Manual

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To ensure trouble free operation, DMX512 stan-
dards require that DMX devices be installed in a
daisy chain, with no tees, wyes or stars in the DMX
wiring. However, site conditions may make star
wiring desirable or even mandatory. A Gray Inter-
faces DMXIsolator permits star wiring by making
each branch of the star appear electrically as its
own entity, unaffected by the other branches of the
star. Additionally, opto-isolation circuitry isolates
each branch to prevent ground loops or accidental
damage from fault voltages on DMX lines.
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Typically, Gray Interfaces DMXIsolators are used
in the following configuration:
•
DMX Output
is connected to dimmers or
other DMX devices
•
DMX Inputs
(A,B,C,D,E, & F) are con-
nected to the remote DMX consoles or
other sources. Only one input may be ac-
tive a any one time.
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LED indicators are provided on the face of the
DMXIsolators for diagnostic purposes. Each group
of three Input LEDs corresponds to one of the
DMX inputs from A to F. The single group on the
far right corresponds to the DMX Output from the
DMXIsolator.
Red LEDs are provided for the main (Input) +5 volt
power supply and the six isolated supplies (
Iso
+5V
), green LEDs are provided for Received data
and amber LEDs are provided for Transmit or
Talkback data, if used.
In conventional operation, the following should be
observed:
•
All red LEDs should be illuminated when-
ever the unit is powered.
•
The amber
Receive
LED at the input sec-
tion (A to F) with the functioning source de-
vice connected and the green Output
Transmit
LED will illuminate
In addition, the following will be observed if devices
using DMX Talkback are used:
•
The amber Outout
Talkback
LED and six
green Input
Talkback
LEDs should illumi-
nate once a functioning talkback device is
connected to DMX Output.
Input A
Output
Receive
Transmit
Talkback
DMX Output
Model