Application of Central Control System in System Integration

1 Introduction

The system integration technology (SI) introduced in this article is an emerging technology. In large-scale systems (such as national networking), corresponding control software is used to connect several independent central control systems through the Internet or a dedicated network to form a networked central control system, which can realize remote control, resource sharing, audio and video transmission and mutual monitoring. In this way, a large-scale centralized, real-time, modern, and comprehensive multimedia audio-visual integration system is constructed to provide real-time and accurate multimedia information for command decision-making and production scheduling.

2 System Integration Technology

2.1 System Integration Concept

The so-called system integration is to integrate various separate devices (such as personal computers, audio and video equipment), functions and information into an interrelated, unified and coordinated system through structured integrated wiring systems and computer network technology, so that resources can be fully shared and centralized, efficient and convenient management can be achieved. The key to the realization of system integration is to solve the problems of interconnection and interoperability between systems. It is a multi-vendor, multi-protocol and application-oriented architecture. This requires solving all integration-oriented problems related to subsystems, building environment, construction coordination, organizational management and staffing, such as interfaces, protocols, system platforms, application software between various types of equipment and subsystems.

2.2 Classification of system integration

System integration includes equipment system integration and application system integration. System integration also includes building various WIN and LINUX servers so that the servers can communicate effectively and provide customers with efficient access speed.

(1) Equipment system integration can also be called hardware system integration, or simply system integration in most cases, or weak current system integration to distinguish it from strong current integration of electromechanical equipment installation. Equipment system integration can also be divided into intelligent building system integration, computer network system integration, and security system integration.

(2) Application system integration provides a system model for customer needs at a system level, as well as specific technical solutions and operation plans to implement the system model, that is, to provide users with a comprehensive system solution. Application system integration has penetrated into the user's specific business and application level. In most cases, application system integration is also called industry information solution integration. Application system integration can be said to be an advanced stage of system integration, and independent application software suppliers will become the core.

3 Central Control System

3.1 Composition of the Central Control System

The central control system realizes the interconnection and centralized control of equipment through a user-friendly human-machine interface, an open programmable control platform, and an interactive control structure. Its core device is the central control host, which uses an embedded processor, a programmable logic array circuit, built-in large-capacity memory and Flash, provides multiple independent programmable RS-232 control interfaces, can send and receive RS-485 and RS422 format data, has an independent programmable IR infrared transmitter port and multiple digital I/O input and output control ports, has a protection circuit, has multiple high-voltage and low-voltage relay control interfaces, has a remote TCP/IP network control port, an embedded infrared learner, provides expandable multi-function slots and multiple network control interfaces, and can expand modules at will. In addition, current central control systems support third-party control protocols. As a complete central control system, it should include (1) user interface, (2) central control host, (3) various interfaces, (4) various controlled devices, and (5) communication network. As shown in the following figure:

Figure 1 Central control system structure

3.2 Construction steps of central control system

To construct a humanized and intelligent central control system, we must start with the design concept. Designing a simple and easy-to-understand control system is a sign of the humanization of the central control system. Then, through strict hardware construction, it is necessary to handle the conversion and connection between various interfaces when building the hardware, so that the conversion is stable and the connection is firm. Then, we start to design the user interface and edit the underlying software, transfer the edited program to the central control host, conduct preliminary debugging and precision debugging, and finally organize various related materials to make instructions. In this way, a complete central control system is generated.

3.2.1 Design Concept

Design a reasonable solution based on specific needs and certain conditions and factors. Follow the steps in the figure below when designing, and then carry out detailed design in each link. Investigate the environment, select appropriate hardware equipment according to the environment and user needs, and then select cables and interface types according to hardware conditions. Then connect the hardware equipment according to the construction specifications to form a hardware system, and finally develop programs suitable for these hardware equipment based on the hardware system.

3.2.2 Hardware Connection

Whether the hardware connection is stable and firm is directly related to the stability of the central control system. Various devices in the central control system have different interface types, and appropriate components should be selected according to these interfaces. The interface types of audio equipment include RCA, XLR-3, PHOENIX-3, 3.5mm Stereo and crimping methods, the interface types of video equipment include BNC, HD15, YRY, HDMI, RCA, etc., the interface types of network equipment include BNC, RJ45, SC, ST, MDI, etc., and the interface types of control equipment include RS-232, RS-422, RS-485, infrared, RF, etc. Most of the interface components need to be soldered with solder using an electric soldering iron when connected to the cable to enhance their durability. Connect various hardware devices reasonably according to certain specifications, as shown in Figure 1 above, and then users can control and schedule various hardware devices through the user interface.

Figure 2 Design concept diagram

3.2.3 Software Development

The software development process is described based on the large-screen display control program of the platform center display system of the Ministry of Science and Technology. The development process includes the design of the user interface, the development of the underlying program, and the debugging of the underlying program.

(1) User interface design

The user interface design uses the world's most advanced pro/Engineer design tool, which is a graphical development environment that uses buttons, pages, texts, and pictures to edit the graphical interface. Operations are achieved by defining join numbers corresponding to the logic symbols of the control program. The design goal of the interface is humanization, that is, the interface should be easy to understand so that users can easily conduct human-computer dialogue. The user interface can be designed on a professional touch screen or in the form of a WEB browser page and controlled through a communication network. The user interface design of the display system of the Ministry of Science and Technology's platform center is shown in Figure 3. This is an interface designed on a touch screen. Clicking a button on the interface will jump to the corresponding control sub-interface.

(2) Development of control programs

The control program of the central control system is developed using the symbolic control programming language SIMPL-windows (Symbol Intensive Master Programming Language), which is a visual object-oriented control system application development tool. It provides the necessary programming, configuration, testing and debugging functions for the system, and realizes the communication between the user interface and the controlled device group. The configuration module of the SIMPL window allows the user to select the control system, user interface, network equipment and controlled equipment to be installed. Assign port addresses, network identification numbers and IP addresses to these hardware.

Figure 3 Design software interface

The development of the control program is actually to write some logic modules that already exist in SIMPL-windows, and pass the logic commands to the underlying program through the edited logic modules. These logic modules are similar to functions, class libraries or controls. Take the large-screen control program as an example. The logic command triggered by the touch screen is passed to the Buffer function, where the command is buffered and changed, and then passed to the underlying program. The underlying program will send the logic command to the large-screen device according to the status of the large-screen device, so that the large-screen device can complete the user's signal switching and other operations. The program is shown in Figure 4:

Figure 4 Design process flow chart

(3) Development of underlying programs

The underlying program of the central control system is developed using SIMPL+, which is a language similar to C. The DVPHD 6-Windows-Switcher in Figure 4 is a low-level program, a macro written in SIMPL+, which is used to send logic commands to hardware devices.

(4) Debugging system

First, the written low-level program should be debugged, and then the debugged low-level program should be put into the program of the central control system. After all other logic functions, classes, and macros in the program are edited, the whole system should be debugged, including the serial port code, infrared code, logic instructions, and hardware stability. When the system is fully debugged, the system can run stably. The whole system is considered to be constructed.

4 Conclusion

The central control system is a specific application of system integration. This article introduces the composition of the central control system in detail from the perspectives of software and hardware with the help of actual engineering projects. The future development direction of the central control system is the intelligent control system, which will be closely linked to wireless mobile communications, and the controlled equipment can be controlled through the user interface anytime and anywhere.