Artistic Licence DALItoDMX 사용자 설명서 - 페이지 9
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페이지 인쇄Appendix 1 - DALI Primer
The DALI data packet comprises three parts:
Address - device(s) being controlled.
y
Command - type of message being sent.
y
Data - the value associated with the
y
command.
On any given circuit, DALI device intensity or
colour can be controlled in four ways:
Scene - replay scenes stored in the
1.
DALI devices.
Broadcast - all devices receive the same
2.
command.
Group - each DALI device can be
3.
assigned to any of 16 groups.
Device – each of the 64 possible devices
4.
is controlled individually.
DMX runs at a much higher speed than DALI
and so it easily out-runs DALI. If this is not
managed, a time lag appears and incoming
data will start to be ignored, resulting in a step
or 'bump' on the dimming curve.
Best results are therefore achieved by sending
the lowest number of commands. Efficiency
decreases as one moves down the above
list, so individual channel control is the most
bandwidth-hungry.
Controlling individual channels can cause
problems if a large number of s are present
due to the high number of commands that
need to be sent. If this method is to be used,
careful consideration should be given to the
bandwidth management.
Commissioning DALI devices
Unlike DMX fixtures, DALI devices do not
have a default start address. This is because
they need unique addresses (called a short-
address) so that only one device replies to the
controller at once.
DALItoDMX User Guide
When new DALI devices are used they
must be commissioned. This requires a
DALI commissioning tool such as an Artistic
Licence
Commissioner
DALI bus power
DALI requires that a current limited voltage
be applied to every circuit, called the DALI
bus power. Without this, the DALI devices will
enter fault mode and not respond.
Artistic Licence offers
bus PSU device designed to work alongside
DMXtoDALI
quad, DALItoDMX,
and other DALI controllers.
Glossary
DALI device (also ballast) – one of the 64 DALI
y
luminaires.
DALI short address – a number in the range 0 – 63
y
which uniquely identifies a DALI device on a given
circuit.
DALI circuit – a two wire interface of maximum
y
distance 300m that contains up to 64 DALI devices.
DALI Bus power – a current limited DC supply which
y
must be provided in order for DALI to operate.
DALI Device Type – Defines the capabilities of a
y
DALI device.
DALI DT0 – Device Type 0 was originally defined
y
as fluorescent but is now used to mean intensity
control.
DALI DT8 – Device Type 8 is used for colour
y
control. There are four possible operating modes
of DT8.
DALI RGBWAF – An operating mode of DT8
y
where Red, Green, Blue, White, Amber, Free (user
defined) and intensity are controlled.
DALI Colour Temperature – An operating mode of
y
DT8 where colour temperature and intensity are
controlled.
RDM – Remote Device Management. The
y
interface used for bidirectional communication
over DMX512.
Footprint – the number of channels or slots used
y
by a DMX512 interface.
Root-device – The main entity of an RDM enabled
y
product. There is only one per RDM product.
Sub-device – Subsidiary entities of an RDM device.
y
dali.
daliPSU quad
a four-
daliGate quad
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