With the rapid development of urban construction and economic construction, more and more high-rise buildings and public activity places are presented to people. As a result, fire hazards increase. There are tens of thousands of fire alarms every year, and very serious fires occur from time to time. This not only brings heavy losses to property and citizens' lives and property, but also affects the economic construction and social stability to a certain extent. Therefore, higher and newer requirements are put forward for the fire automatic alarm control system focusing on prevention.
At present, most of the automatic fire alarm controllers on the market, their central processing units are controlled by single-chip microcomputers. The single-chip microcomputer is widely used due to its price advantage, simple hardware and easy maintenance, which can be described as high quality and low price. However, with the increase of the system capacity, the processing speed and capacity of the single-chip microcomputer are obviously not enough. The software programming of complex systems is cumbersome and the operation is inconvenient, especially when the alarm plan is to be displayed, this kind of controller cannot be realized. computer. As a result, the controller with the industrial computer as the central processing unit came into being. It uses Chinese Windows2000 as the operating platform and uses language programming, so that the controller has a good interface and better compatibility, overcomes the above shortcomings, and its capacity is more Large, more functional, can well adapt to market demand.
Hardware Design of Industrial Computer
1. Central processing unit
The basic configuration requirements of the central processing unit of the system: CPUPⅢ, memory 128M, hard disk 40G, video memory 8M, can use Yanyue industrial computer, install Windows2000 operating system, use 12-inch TFT high-definition true color flat panel display, and keep two USB Interface, one network port, one parallel interface.
In the large-screen splicing system, it is easy for us to focus on the splicing unit, but there is a hero silently supporting behind the scenes, and this hero is the splicing controller. The quality of the splicing controller directly determines the quality of the entire large-screen display system, and also determines the function of the entire display system. When the system is in application, the system often crashes, the screen is blurred, the expansion performance is not strong, the image is trailing, high-definition When the signal catches up, the diagonal cut pattern, and the picture jitters, our users really pay attention to the root cause of the problem, and finally lock all the problems on the splicing controller, and then realize the importance of the splicing controller.
Large-screen splicing controller is also known as picture splicing device, wall controller, video wall splicing device, display wall splicing device, multi-screen processor, multi-screen splicing processor, display wall splicing device, large-screen processor, multi-screen image Processor, Display Wall Processor. The main function is that it can be switched to full-screen display, multi-channel split-screen and cross-screen display, can be moved, zoomed and roamed arbitrarily, and can support simultaneous access of multiple video devices, such as: DVD, satellite receiver, set-top box, computer signal Wait
The splicing controller is divided into two types in the process of use, namely the built-in processor and the external processor. The built-in processor is also called the embedded processor. It is small in size and has few functions. Most embedded processors can only realize Full-screen full-screen display and single-screen single-display function. Currently, the most powerful embedded processor is Juyang's SCUⅢ series processor, which can only achieve single-screen four-HD image roaming, so usually the built-in processor is used as an external processor. Used for processor backup.
At present, there are four generations of external splicing controllers on the market, but each generation has its own unique characteristics, so there are four common processors on the market. The generation is PCI industrial control type, and the second generation is FPGA pure Hardware type, the third generation is a dual-system splicing controller, and the fourth generation is a distributed graphics processor.
Generation: PCI industrial control splicing controller
The working principle of the industrial computer is to use the multi-channel PCI computer motherboard through the PCI plug-in card type. Some PCI slots are inserted into the video capture card, and the other PCI slots are inserted into the video output card. The input and output are constructed by the CPU. At this time, an industrial control controller is formed. His graphics processing principle is to divide the parent signal into M*N sub-video signals after the CPU operation, and then amplify each sub-signal and transmit it to each corresponding unit on the splicing curtain wall, and the display unit transmits the processor to the The incoming signal is implemented on each display unit of the large screen, and the resolution and processing speed are determined by the computer CPU and the corresponding PCI card. For example, the computing speed of 1 720P is 350MHz/nS, and the computing speed of 10 720P is 3.5MHz/nS. At this time, the computing power of the CPU is greatly reduced. Due to the limited computing power of the industrial computer, a better performance Industrial control splicers such as PRO6000 series of Juyang Company are larger and can only implement 9 cards. The number of signals supported by each card is RGB/DVI/VGA/HDMI/YPbPr: 2 channels/input card; Video : 8 channels/input card; DVI: 4 channels/output card; SDI: 2 in 2 out/card; Dual-Link: 1 channel/card inserted and spliced, which greatly limits the demand for large-screen display systems. For the standard of a single slot, Juyang needs to be cascaded to complete the normal splicing, and the cutting system is relatively complex.
Advantages of PCI industrial splicing controller:
Various application software can be supported
Disadvantages of PCI industrial splicing controller:
1. Unable to receive a large number of inputs and outputs.
2, with an operating system, the relative stability is not high.
3. All input and output are processed by graphics card, and the price is higher.
The second generation: FPGA pure hardware splicing controller
FPGA (FieldProgrammableGateArray), called Field Programmable Logic Array, is hardware developed after PCI architecture. The FPGA chip has the characteristics of fast speed, parallel processing and flexible functions, but the chip itself is just a blank hardware platform without any function, and requires technicians to perform hardware programming according to their own requirements. The processing core of the FPGA pure hardware splicing controller series is the FPGA chip array.
The system has high-speed signal processing technology to ensure real-time processing of high-resolution signal input and output. DDR technology is used for high-speed data cache, and pipeline technology is used to process high-speed signals in a hierarchical order to ensure the real-time performance of signals. At present, the input standard resolution of Juyang's FPGA pure hardware splicing controller system can be as high as 1920x1200x60Hz, and the non-standard resolution can reach higher. Dynamic real-time.
The FPGA pure hardware splicing controller adopts the signal parallel processing technology based on the input port, which effectively increases the number of input signals. The system processes the high-speed graphics data stream step by step through the chip array, and each signal input corresponds to a column of processors. This is equivalent to many processors working at the same time to achieve parallel processing of data, which greatly improves the operating speed of the system. Effective use of parallel processing technology makes the data disperse processing, without the speed bottleneck of the single processor of the industrial computer, thus making the system insensitive to the number of input signals. That is to say, increasing the number of signal inputs does not increase the overall computational burden of the system, so that the system can accept multiple high-speed signals. It can effectively carry out multi-channel VGA/RGB signal input, which is a greater performance advantage of the FPGA pure hardware splicing controller series compared with ordinary plug-in card-type industrial computers.
Advantages of FPGA pure hardware splicing controller:
Free from interference, high stability
Pure hardware architecture, startup speed block
Cost-effective
Disadvantages of FPGA pure hardware splicing controller:
Since it is pure hardware and has no operating system, it needs the assistance of other devices to realize the functions of other application software.
The third generation: dual system splicing controller
The dual system combines the advantages of PCI architecture and pure hardware. The fifth-generation FPGA array is used as the hardware basis, and the parallel high-speed graphics processing technology is used to realize the unified processing of multi-channel high-speed video signals, which fundamentally solves the problem that the number of VGA signal input is affected by limitation issue. The inside of the machine consists of multiple arrays of hardware modules.
Dual-system splicing controller, the two systems are completely independent, if one system has problems, the other system can still run normally to ensure the normal display of various signals.
The multi-screen processor adopts the high-speed data transmission technology of the full cross-scheduling architecture, and the underlying data transmission is controlled by the original data scheduling chip technology of the dual-system splicing controller image processor. Video and other image signals share their own dedicated channels for transmission, ensuring complete real-time display of all signal images including RGB signals, and the display speed of RGB signals reaches 60 frames per second.
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