The basic components of DMX512 and SPI-TTL control systems: main controller, sub-controller, signal amplifier, and luminaire. The upper controller (switch, fiber network) is between the main controller and the sub-controller, and the underlying RS485 or TTL is controlled between the sub-controller and the luminaire as the underlying network. The upper layer network receives the host image signal, and the underlying network connects a large number of lamps. Different control systems have different signal transmission speeds and modes. The higher the speed, the shorter the transmission distance. At present, the control technology basically adopts image scanning mode for high-speed transmission, and the signal transmission distribution area is large, which is easy to cause an out-of-control state.
It should be said that DMX512 and SPI control are mature technologies, but it is not enough to apply to Chinese landscape LED lighting. why? The main reason is whether our engineers have a deep understanding of the basic technology of electronic communication.
E.g:
What is DMX512? What is SPI-TTL? What is RS485? What is the principle of DMX512 and SPI-TTL communication transmission? How far is the transmission distance between the two, how to configure the signal repeater, and when to configure the signal repeater. Why is the higher the transmission rate, the shorter the transmission distance, and what effect does the transmission signal reflection have on the system? When to configure the signal terminator, why is the communication line serial, parallel, why is the signal on the DMX512 bus connected to more than 30 lamps not smooth, the communication baud rate and the transmission distance are related, the lamp design RS485 bus driver input impedance What is the reason, why the signal line sometimes has to use serial communication, why sometimes it is necessary to use parallel communication, why serialization, parallelism is not important, what is important is how to use serial and parallel signal application methods, how to evaluate the whole Engineering risks, etc., etc., there may be many reasons why? However, I sincerely remind young engineers, especially if you don't know why, it is best not to undertake large-scale landscape lighting projects, otherwise you will one day ruin your boss.
On the other hand, our landscape architects are driven by the interests of business bidding, and often disregard all the specials, regardless of the control system debugging engineer life and death, can not wait to design the entire building as a rainless and unobstructed outdoor TV screen. The consequences of this self-contained landscape lighting project can be imagined.
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