The embedded system is broadly considered to be a controllable system composed of system hardware and system software and has high reliability and real-time performance. It is designed to meet certain engineering requirements with high specific requirements. These requirements can be reflected in The specific requirements for the cost, size, and system power consumption of embedded systems, and to achieve this, can be tailored to the software and hardware components that make up the embedded system. Engineering project development for embedded systems requires not only professional embedded system development tools and integrated development environment IDEs, such as IAR, but also a cross-compilation process between the host and the embedded system development board.
The hardware system of the embedded system consists of embedded processor, memory and system peripherals. The embedded processor usually includes an embedded microcontroller MCU, an embedded microprocessor MPU, and an embedded DSP processor. As the core of the hardware system of the embedded system, the technological development of the embedded processor largely determines the function and application realization of the embedded system product.
The software system of embedded system can be divided into three parts: embedded operating system, embedded middleware component and embedded application software. Among them, embedded middleware software is a kind of software resource used to help and support the development of embedded application software, usually including database and related software development tools. The embedded application software is a user application designed and developed based on the selected system hardware platform according to the requirements of the specific project.
The embedded operating system can be understood as an operating system designed for embedded systems. The embedded operating system supports the allocation of software and hardware resources of the entire embedded system and the scheduling and coordination between multiple tasks.
In recent years, with the rapid construction of highways and urban rail transit, the demand for various LED displays designed for intelligent transportation has become more and more important. The LED display can display and release various road condition information reflecting road traffic conditions in real time, and can provide road traffic participants with the choice of traffic routes to avoid large-scale traffic congestion. LED display screens as intelligent transportation systems The information display release method can significantly improve the traffic rate of the road network and rationally distribute traffic flow.
The design function of the LED display products involved in the field of intelligent transportation is generally as follows: the traffic management control center releases the real-time road traffic information to be displayed to the LED display control system installed at the traffic site through the host computer software, and the LED display screen displays the real-time. The road traffic information completes the traffic guidance work for the traveling vehicle; the on-site installed LED display control system returns the various information of the traffic scene to the traffic management control center in real time, so that the traffic control control also determines the on-site installed LED display in real time. Working status.
The traditional LED display control system design generally uses a minimum system consisting of a single-chip microcomputer, a flash memory and a static random access memory chip. Among them, the LED display screen displays the update of the data and display content, and the LED display control system and the upper position. The communication between the machines is completed by the single-chip microcomputer. However, with the continuous development of embedded technology and the increasing demand for LED display functions, the problem of limited resources of the single-chip system has become increasingly prominent. The LED display control system based on single-chip microcomputer has been unable to to satisfy the market's needs. Based on the above-mentioned limitations of the traditional LED display control system, in the design and application of actual engineering projects, powerful ARM and FPGA can be used as the core part of the LED display control system, among which the LED display control system and the upper computer The communication part is realized by ARM, and the dynamic scanning part of the LED display is completed by FPGA.
The communication between the upper computer of the traffic management control center and the LED display control system installed on the project site can use standard computer data serial communication mode and Ethernet communication mode, including RS232, RS485, LAN, and optical fiber transmission in communication mode. With wireless transmission and so on.
APM model SPS300VAC9000W 3 Phase AC Power Source system is able to provide not only stable DC/AC Output Power,but also 3-phase / 1-phase output.The 3 Phase Ac Power Supply is with high speed DSP+CPLD control, high frequency PWM technology, active PFC design. Reliable ac sources for applications such as electric, lighting, aviation sectors, enterprise`s production test etc.
Some features as below:
- 5.6`` large touch color screen, possess complete functions and easy to operate.
- Support for USB data import/export and screen snap from front panel.
- AC+DC mixed or independent output mode for voltage DC offset simulation.
- Capable of setting voltage and current output restriction, support for constant current output mode.
- Capable of setting output slope of voltage and frequency.
- Capable of setting ON/OFF phase angle.
- With reverse current protection to avoid current flowing backward.
- Built-in power meter, which is capable of measuring 5 electrical parameters per phase, including voltage, current, power, etc.
- Support mA current measurement function.
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