Comparative Analysis of Performance of Foreign DMX512 and DALI Control Systems

DMX512

DALI

DMX512 is a dynamic effect

DALI is a static effect

DMX512 is mainly used for stage lighting and landscape lighting.

DALI is mainly used for indoor lighting;

DMX512 is one-way communication,

DALI is a two-way communication that can query the status of the decoder and has a feedback signal function.

DMX512 baud rate 250K bit/S,

DALI baud rate is 1200 bit/s.

DMX512 addressing range 512 slave addresses

DALI addressing range 64 slave addresses

DMX512 protocol is simple, only 1 protocol

The DALI protocol is complex, with more than 200 protocols, and different lights have special extension protocols.

DMX512 uses RS485 communication (belonging to voltage signal)

DALI uses carrier mode as the communication bus, providing 250mA (belonging to the current signal)

DMX512 frame structure is simple

The DALI frame structure adopts the Manchester code, which divides the forward frame and the return frame, and the structure is relatively complicated.

The DMX512 adopts a master-slave configuration with up to 512 slave addresses.

DALI is also a master-slave, up to 64 slave addresses, (DALI can also implement multi-master multi-slave structure, free topology.

DMX512 maximum refresh rate of 44 frames / sec (dynamic effect), grouping, scene, stored in the host real-time scan transmission

DALI has no refresh rate (static effect), parameters such as grouping, scene, and gradation time are stored in the slave decoder. After the debugging is completed, the host can be evacuated.

DMX512 address is set to manual mode

DALI address settings can be assigned manually or automatically by the host

The number of DMX512 packets depends on the host.

DALI is fixed, up to 16 groups

DMX512 scene number depends on the host

DALI is a fixed value, up to 16 scenes.

Control System

DMX512

DALI

P2 control system

letter of agreement

The host sends a 512-byte scan signal transmission command and data per frame in real time. Only 1 agreement

The master slave transfers commands and data in 1-2 bytes. More than 200 agreements

The master slave transfers commands and data from 8-32 bytes. There are more than 10 agreements,

Addressing range

512 monochrome lamps. Or 170 RGB tri-color fixtures. 512 addresses

Master-slave structure, the subsystem connects up to 64 addresses of lamps

Master-slave structure three-dimensional addressing 256*256*256=16777216 addresses

Communication method and

Communication baud rate

RS485 communication standard

Fixed to BPS=250K

Manchester code

Fixed to BPS=1200

RS485 communication standard

BPS=1200-250K (optional)

Basic characteristics

The host sends a 512-byte scan signal dimming display per frame. Adapt to real-time dynamic image display. Poor anti-interference ability.

Adapt to indoor lighting control, flexible access to a variety of standard sensors, system anti-interference ability.

The addressing range communication baud rate is flexible and has the scene display automatic memory function, which is suitable for long-distance transmission anti-interference ability.

system structure

Complex system structure

Simple system structure

Simple system structure

Scope of application

Stage lighting, outdoor landscape lighting control

Indoor lighting control.

Indoor and outdoor landscape lighting control

A variety of ambient lighting controls.

General standard

Have

Have

(Enterprise Standard)