November 27, 2020

What lighting environment is DALI system and DMX512 suitable for controlling?

DALI system is not suitable for Chinese landscape lighting control
Address structure analysis:
The DMX512 protocol is a one-dimensional address structure with 512 channels (sending scan signals to maintain dynamic image display) suitable for landscape lighting control.
DALI protocol belongs to two-dimensional address structure 64 lamp address (16 group address) address structure is simple, can not display dynamic images, not suitable for landscape lighting control
The DMN protocol belongs to three-dimensional addressing: (row address, column address, matrix address) meets any combination of cutting points, lines, blocks, and partition matrices, and is suitable for landscape lighting control.
Signal baud rate analysis:
The DMX512 protocol sends a scan signal to maintain dynamic display with a high baud rate of 250K. The image can be refreshed for landscape lighting control.
The DALI protocol does not need to send a scan signal to adjust the brightness of the lamp, and the low baud rate is 1.2K. Cannot refresh the image, not suitable for landscape lighting control.
The DMN protocol does not need to send a scan signal to adjust the brightness of the lamp, and the low baud rate is 4.8K. Suitable for a variety of logical image landscape lighting control.
Communication method analysis:
The DALI protocol belongs to the two-way communication mode and the Manchester code transmission mode. The signal line can be coaxially laid with the 220 volt power line for strong anti-interference ability.
The DMN protocol is a two-way communication method, which is suitable for distributed environment and indoor lighting control. At the same time, it can also take care of a variety of logical image landscape lighting control.
Lamp dimming analysis:
The DMX512 protocol luminaire relies on the host to send the scan signal, and the luminaire is passively dimmed according to the host signal. The network communication signal is scanned at high speed and frequently transmitted continuously, which is suitable for landscape lighting control.
Both the DALI protocol and the DMN protocol belong to the host to send only one start short command packet, and the luminaire actively controls the PWM dimming. There is no host scanning signal in network communication, 99% of the network is idle, and the network interference time gap is small. That is to say, the DALI and DMN system lamps are truly active intelligent lamps, and the DMX512 lamps only rely on the host signal. Complete the lamp dimming function, which is the biggest difference between the two control systems. However, since the DMN protocol is three-dimensionally addressed, although the image cannot be refreshed, it is suitable for a variety of logical image landscape lighting control.
Through the above analysis, the conclusion is that DALI is not suitable for landscape lighting control. In particular, it is not suitable for China's "birdcage" landscape lighting project.
DMX512 is not suitable for indoor energy-saving lighting control
Address structure analysis 1:
The DMX512 protocol belongs to the one-dimensional address structure of 512 channels (sending scan signals to maintain dynamic image display)
The DALI protocol belongs to the two-dimensional address structure 64 lamp address (16 group addresses)
DMN protocol belongs to three-dimensional addressing: (256 * 256 * 256 = 16777216 lamp address) to meet any combination of cutting points, lines, blocks, partition matrix
Signal Baud Rate Analysis 2:
The DMX512 protocol sends a scan signal to maintain dynamic display with a high baud rate of 250K. The transmission distance is short. Signal reflection is strong and long-distance transmission is unstable.
The DALI protocol does not need to send a scan signal to adjust the brightness of the lamp, and the low baud rate is 1.2K. The transmission distance is long. Signal reflection is small and long-distance transmission is stable.
The DMN protocol does not need to send a scan signal to adjust the brightness of the lamp, and the low baud rate is 4.8K. The transmission distance is long. Signal reflection is small and long-distance transmission is stable.
Communication method analysis 3:
The DMX512 protocol is a one-way communication method and cannot detect the working state of the luminaire. Not suitable for distributed environment, indoor lighting control.
The DALI protocol is a two-way communication method that can detect the working status of the luminaire. Suitable for distributed environment, indoor lighting control.
The DMN protocol is a two-way communication method that can detect the working status of the luminaire. Suitable for distributed environment, indoor lighting control.
Lamp dimming method analysis 4:
The DMX512 protocol luminaire relies on the host to send the scan signal, and the luminaire passively dims according to the host signal. The network communication signal is scanned at high speed and frequently and continuously, and the long-distance, distributed network transmission signal is easy to cause instability.
Both the DALI protocol and the DMN protocol belong to the host to send only one start short command packet, and the luminaire actively controls the PWM dimming. There is no host scanning signal in network communication, 99% of the network is idle, and the network interference time gap is small. That is to say, the DALI and DMN system lamps are truly active intelligent lamps, and the DMX512 lamps only rely on the host signal. Complete the lamp dimming function, which is the biggest difference between the two control systems.
System flexibility analysis 5:
DALI protocol and DMN protocol have the flexibility of arbitrary segmentation address and space capacity, which is convenient for controlling the brightness of each local, regional and every fixture. Suitable for indoor energy-saving lighting control. Through the different gateways, you can access the overall timing control of GPRS, CDMA, Zigbee, and GPS wireless remote LAN.
The DMX512 system is only suitable for stage lighting control, and it should be carefully designed for large landscape lighting.
Through the above analysis, the conclusion is that DMX512 is not suitable for indoor energy-saving lighting control.

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