• Two-way communication
• Originally developed in 1990’s as part of IEC 60929 for
linear fluorescent systems
– Recently removed, expanded and turned into IEC 62386
• Requires two low-voltage differential wires which carry a
low-speed signal, daisy chained across one or more devices
• Easy to assign individual control devices (dimmers,
sensors) to one or many light sources without added wiring
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| iControl Electronics Co., Ltd www.icontrol.com.vn |
DALI features and challenges:
Features:
- Single interface for Electronic Control Gears and Electronic Control Devices
- Addressing of up to 64 individual components per DALI link, at data rates of 1200 bits/second
- Allows control and status reporting of wide variety of ballasts, dimmers, sensors
- Presumes that control signal is run as UL Class 1 (with AC)
Challenges:
- Many manufacturers have “proprietary” extensions, resulting in interoperability problems with components from other manufactures
- Typically time-consuming and complex commissioning
- Some manufacturers run control signal as UL Class 2
Typical DALI system architecture:
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| iControl Electronics Co., Ltd www.icontrol.com.vn |
Standard does not allow multiple “masters” per system.
Varying “extended” DALI standards may, however.
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