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Betapack DMX512 Input Kit Instructions
Introduction
A DMX cable from a lighting desk carries control
signals for 512 dimmer channels. The Betapack
DMX Input card will decode any sequential group
of six channels out of the 512. The DMX OK led
indicates when error free DMX data is being
received.
Warning
Disconnect from supply before starting
To Fit the DMX Input Kit
1. Disconnect from the mains supply
2. Remove the two screws securing the rear
plate.
3. Remove the rear plate by pushing it down
and pulling the top towards you.
4. Remove the two side screws securing the
right hand glanding plate (the one furthest
from the mains input).
5. Disconnect the yellow signal input loom from
the Betapack main board and connect it to
the DMX Input card.
6. Connect the flying lead from the DMX Input
card to the Betapack main board.
7. Secure the DMX input card in position with
the two side screws.
8. Fit the two XLR connectors to the front panel
of the Betapack.
9. Connect both sets of wires into the 'DMX IN'
terminal block on the card with reference to
the connections shown opposite.
10. Use tyraps provided to secure wires to
existing yellow loom.
( NOTE this will be made easier by
removing the bottom panel )
11. Reassemble in reverse order.
Setting the Start Channel
The start channel address determines which
group of six channels the card will decode. For
example; if the start address is 105, channels 105,
106, 107, 108, 109, and 110 will control the six
Betapack channels. The start address may be set
between 001 and 507.
Note: If the 100's switch is set to 6 or 7, the other
two switches set the pack number (between 01
and 84). If an undefined switch setting is used the
default 001 will be assum ed.
Cables for DMX Transmission
The maximum cable length between a desk and
the Betapack will depend on several factors
including:
Type of cable used
Number of DMX Betapacks connected
Electrical enviro nment
Zero 88 recommend that shielded twisted pair
approved for RS422/485 (e.g. Belden 9841,
Belden 9501 or Alpha 5271) is used.
Communication over a hundred metres should
normally be possible without problem, however for
longer cable runs, it may be necessary to fit a
DMX Termination Plug (Stock No 269) to the last
Betapack in order to ensure completely error free
data transmission.
Substitution of microphone, or other types of cable
may be possible, but data transmission errors are
more likely, particularly over long distances.
Fitting
This item should only be fitted by a suitably
experienced or trained technic ia n.
Technical Specification
Data reception conforms to USITT DMX512 1990
standard and earlier automatically.
Power Supply +16V to +28V @ 85m A
(supplied from Betapack)
XLR Connections
Pin 1: 0V (Signal common) Screen
Pin 2: 1- (Dimmer Drive Compliment) Red
Pin 3: 1+ (Dimmer Drive True) Black
Pin 4: Spare
Pin 5: Spare
Second Edition - March 1994
© Zero 88 Lighting Ltd 1994. E &OE.
Zero 88 reserves the right to make changes to the
equipment described in this manual without prior
notice.
This equipment is designed for use with a
Betapack dimmer unit only and is unsuitable for
any other purpose.
Zero 88 Lighting Ltd, Usk House, Llantarnam Park, Cwmbran NP44 3HD, U.K
Tel: +44 (0)1633 838088 (24 Hr Answer Phone) Fax: +44 (0)1633 867880 Stock No: 73-346-00
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