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The speed is kept low so no [[Electrical termination|termination resistors]] are required,<ref name=da>{{cite web |url=http://www.dali-ag.org/c/manual_gb.pdf |title=Digital Addressable Lighting Interface |publisher=DALI AG, Activity Group, ZVEI-Division Luminaires |website=DALI |date=September 2001 |access-date=12 July 2013 |url-status=dead |archive-url=https://web.archive.org/web/20130627012349/http://www.dali-ag.org/c/manual_gb.pdf |archive-date=27 June 2013 }}</ref>{{Rp|21}} and data is transmitted using relatively high voltages ({{val|0|4.5|u=V}} for low and {{val|16|6.5|u=V}} for high{{r|da|p=19}}) enabling reliable communications in the presence of significant electrical noise. (This also allows plenty of headroom for a bridge rectifier in each slave.)
Each bit is sent using [[Differential Manchester encoding|Manchester encoding]] (a "1" bit is low for the first half of the bit time, and high for the second, while "0" is the reverse), so that power is present for half of each bit. When the bus is idle, the voltage level is continuously high (which is not the same as a data bit). Frames begin with a "1" [[start bit]], then 8 to 32 data bits
==Device addressing==
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