Omega Dimmer series User manual version 1.0 09.2011
17
5. Appendix
DMX-512 Protocol
DMX-512 protocol has 512 channels
in
one
universs. Channels
(adress) can
be
committed in any way depending on the device. To operate equipment with DMX-512 protocol is
necessary one channel or multiple channels in a row depending on type of device. User sets up the
address of the equipment, which coincides with the light control panel installed. There are a lot of
equipment, which can
be
controlled via DMX-512 protocol, and they may have different
DMX channel number, so the start address must be selected in advance. DMX channels should
never overlap with each other. If the DMX channels are overlapping, equipment can run wrongly. If
you use
the same type
of equipment can impose a
range
of
facilities with
the
same starting address, only take into
account that
the
installation will
work
exactly
the
same and you will not be able to drive one of these machines separately.
Important:
EIA-485 standard requires that the device can be connected to one DMX univers with a
series circuit. In accordance with the provisions of the standard in one DMX series circuit can connect
only 32 devices. To be able to connect more than 32 devices in one DMX univers, you need to use the
DMX signal splitter vith the recovery function, which inputs and outputs are optically isolated.
Otherwise, the DMX-512 signal may be distorted and device management from the light control panel
will not be possible.
DMX Ddata cable
Use a Belden© 9841 or equivalent cable which meets the specifications for EIA RS-485
applications. Standard microphone cables cannot transmit DMX data reliably over long
distances. The cable will have the following characteristics:
2-conductor twisted pair plus a shield
Maximum capacitance between conductors
– 30 pF/ft.
Maximum capacitance between conductor and shield
– 55 pF/ft.
Maximum resistance of 20 ohms / 1000 ft.
Nominal impedance 100
– 140 ohms
CABLE CONNECTORS
Cabling must have a male XLR connector on one end and a female XLR connector on the other
end.
DMX connector configuration
