OFweek Semiconductor Lighting Network An excellent LED control system solution should be based on the project requirements of the LED control system, the control system solution should be more consideration for the flexible adjustment of the control system, data backup and expansion and extension. . In the design of LED control system, we have to consider two major problems: 1. Technical limitations: performance parameters and limiting factors of various parts of the LED control system; 2, the solution, the corresponding program design for the project function requirements. Technical limitations First, communication transmission limitations Communication transmission is mainly reflected in the following aspects: (1) Data transmission between controllers At present, the data transmission between most controllers in the market adopts the standard network protocol, and the selection of the wire is generally not lower than the super five twisted pair. According to the standard network protocol standard, the line spacing of a single network cable does not exceed 100 meters. However, in field applications, it is often encountered that the distance between controllers exceeds 100 meters. If this is the case, a fiber transmission solution is generally used. At present, the fiber optic technology is very mature, and the overall cost is even lower than the network cable. In the landscape lighting project, single-mode fiber transmission is used, and the line spacing can reach 15Km. Generally, on a small control system, an SD memory card is inserted in each controller, so the network cable is not used for transmission on the animation data, but the synchronization frame is transmitted through a protocol such as RS232/485. The line spacing is generally around 150 meters. Of course, there will be some controllers to carry out technical research on this part. For example, the synchronization line of the MR-502 control system can reach 1.2Km. (2) GPS synchronized signal probe line spacing At present, GPS synchronization application has become very popular in the field of outdoor landscape. In general, the GPS probe uses PS/2 interface to connect with the controller. The line spacing is generally about 2 meters. The probe is attached to the top of the metal rainproof box by the iron. However, there are some special circumstances in the field, which leads to the line distance not meeting the actual requirements and the GPS signal strength in the area is weak. Therefore, according to the previous application, the extension line is added and different probe placement positions are tried to solve the problem. The application is very cumbersome and complicated. However, the small difficulty is difficult to block the development of technology development. At present, GPS wireless signal amplifying transponders, such as MR-G2AFS wireless GPS amplifying transponder, have been used to receive GPS synchronization signals through GPS enhanced signal receivers. The 30-meter data line is forwarded to the GPS synchronization master through the wireless module to achieve the strength and accuracy of the GPS synchronization signal. (3) Wireless transmission of control system communication data During the implementation of the project, there will be no conditions for the laying of communication data wires on the site. For example, it is impossible to lay optical fibers and network cables between buildings, and if there are special landscape buildings (such as Ferris wheels), it is impossible to use wired data. transmission. Then wireless transmission of large amounts of data becomes a technical barrier. At present, a carrier-class high-power wireless bridge can be used to solve this problem. For example, the Commsen wireless device can generally realize 3-10Km wireless transmission through a high-power wireless bridge. Of course, the greater the wireless transmission distance, the greater the wireless bridge power requirement, and the corresponding reduction in the amount of data transmitted. Second, the drive signal transmission limitations In the application of the control system, it is often encountered that the customer consultation, the distance from the controller to the luminaire driving signal transmission distance, the answer is the specific situation, specific analysis, specific solution. There are two situations: (1) SPI serial drive mode In the SPI serial drive mode, the driver chip uses TTL level signals to transmit data. The distance between the general controller and the headlight is Between 40-60 meters. If this distance is exceeded, a differential board can be added to convert the TTL level signal into a differential signal for transmission. Before the first lamp, it is converted into a TTL level signal to control the luminaire, and the general distance can reach 150 meters. (2) DMX512 two-wire parallel drive mode (standard protocol) In the DMX512 two-wire parallel drive mode, the driver chip uses DMX512 differential signal for transmission, and the distance between the general controller and the first lamp can reach 100 meters. If this distance is exceeded, a DMX512 repeater can be added. The DMX512 can be re-driven before being installed in the first lamp. The general distance is 150-200 meters. Third, the limitations of different systems joint control At present, there are more and more requirements for different system joint control in the project demand, mainly focusing on two aspects: joint control of outdoor landscape LED control systems of different manufacturers, and requirements for joint control of different types of control systems. In the general sense, the outdoor landscape LED control system of different manufacturers is impossible to jointly control. Because the internal communication protocol for each manufacturer's control system is the primary core technology, it is generally difficult to open each other's core protocols. Then, only in the case of relative technical protection, some types of protocols are opened and provided to the upper-level joint control terminal.
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