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  1. Distributed Real Time PCM System, UML Design and Development with Embedded Programming.
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For IEEE to continue sending you helpful information on our products and services, please consent to our updated Privacy Policy. Email Address. Sign In. Access provided by: anon Sign Out. An object-oriented platform-based design process for embedded real-time systems Abstract: The growing complexity of today's embedded real-time systems demands new methods and tools in order to manage the problems of design, analysis, integration and validation of complex systems. This paper describes an object-oriented platform-based design process for real-time embedded systems.

PCM System 3. Class Diagram 4. PCM System Validation 5. Introduction Designing and implementing a distributed real time embedded system involving any kind of software and hardware is always a challenging task for the designers and developers. To overcome the problems in resolving the challenge of creating an appropriate hardware oriented software application capable of monitoring plugged printing devices and automatically extracting print based information from each user system of a workgroup, and managing that using a database management system, a methodical research is conducted mainly in the fields of system programming[1], embedded systems[6], printer and plotter controlling[2] and network programming[3],[4].

Concepts of Real Time Systems

System programming is also renowned as the low level programming methodology, the branch of software programming capable of providing services to control hardware devices. Using system programming concepts a programmer not only can control the basic internal hardware components of a computer e. Old, most recommended, commonly used system and embedded programming languages are Assembly[5] and C languages[6]. In an intranet workgroup environment where multiple users are connected to one or many print servers can send multiple print requests to associated printers including plotters.

Many useful commercial print management software applications do exists e. There is no such freely available open source solution available which can help in having the information e.

Application of UML in Real-Time Embedded Systems

The manuscript is organized as follows: going from a more general overview, section 2 describes the implemented PCM System. Section 4 validates the potential of PCM System with the help of a case study of a real time scenario. Section 5 concludes the manuscript.

PCM System Targeting the defined problem of automatically extracting print based information from each user system of a workgroup and managing that using a database management system, and following the concepts of system programming[1], printer and plotter controlling[2] and network programming[3],[4], proposed a new approach i. PCM System is capable of working in any existing implemented network structure, providing current view of connected print devices, monitoring printing, providing print history and notifying printing.

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Figure 1. PCM System; Intranet Structure PCM System is based on product line architecture[18], to make software application flexible enough to easily adopt future updates and additional features. The client module is needed to be deployed in the user systems intranet workgroup machines , a server module is needed to be deployed at main server and admin module is needed to be installed at administrator machine Figure 1. The client module is like a thread[17] working at user machine capable of tracing and providing all in use or provided printers and plotters.

The client module is capable of getting information about physically attached printers real time printers which prints the job on paper etc. Adobe PDF engine used to convert files of different formats e. When a user will send a request to any attached printer physical or virtual then the client module will automatically snatch requested information and send to the server module.

Table 1. IP address or direct name. The job of server module is to receive sent data by the client module from user machine s and then save that in database management system located at the database server. The admin module Figure 2 is the developed graphical user interface GUI [25],[26],[27] which allows user to connect to the database server to get server saved data and perform data manipulation operations. The job of Admin module is to let administrator connect to database server using valid login name, password and host name , have all stored data and search particular records using provided filters.

Additionally a security mechanism is also developed and deployed for the user, client and admin authentication, while logging, sending and receiving requests at servers print and main both. Figure 2. It is capable of facilitating software engineers with stand alone and interconnected semiformal Meta design views for modelling software architectures[13]. Actor and Activities. In most of the cases actor is either user or system itself as a remote actor and activity is the event triggered by the system in response to the request by actor for some action.

The use case of PCM System explains the basic flow of user system interaction starting with the execution of software application. User logins successfully, opens any text or graphic document e. Microsoft word, power point, excel sheet, notepad, image file, PDF etc. In return user will get printed document and print information status will be extracted and saved.

Table 2.

Data Flow Diagram Figure 4. PCM System; Data Flow Diagram The data flow diagram is the way of producing visual presentation of data flow inside a software application[15]. At first data file text or graphic or both is opened by the user and sent for printing. Print information is extracted and sent to the main server by the client module.

The server module will then store received data in the database, which then can be manipulated by administrator using the admin module. Flow Chart Flow chart is the step by step visual representation of defined interlinked processes operations in a software application[16], categorized in different shaped boxes representing different kinds of operations connected by directional and unidirectional associated arrows.

The flow chart of PCM System starts with the user login in the system connected to the workgroup of the intranet. User is supposed to open one or multiple document file s and prepare request for the printing using plugged printers.

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  • In case of unsuccessful printing, control will be sent back to File and notification will be sent to the user. If printing will be successful then print information data packets will be sent to the main server of the work group. In case of unsuccessful data packet transfer control will be sent back to the client module and in case of successful data packet transfer information will be stored in the database Figure 5 and system will be ready for next transaction.

    Figure 5. System Sequence Diagram Figure 6. PCM System; System Sequence Diagram The system sequence diagram SSD represents a particular scenario text or graphic defined by the use case, especially for the transaction oriented systems[9]. SSD mainly consists of actors users , messages methods called by the actors, return values optional, if any and loop indicators. The main reason of using SSD is to explore the logic of multifaceted operations procedures or functions.


    EECE.5720 Embedded Real Time Systems (Formerly 16.572)

    Component Diagram Component diagram is the visual presentation of assembled constituents representing structural relationship between service provider and consumer[10]. It allows the designer to confirm system's functionality to be implemented in the form of components using internal and third party services e. Figure 7. Internal intranet communication is based on sockets. Print lookup service is implemented for Print information extraction from user system.

    Relational database was created in MySQL enterprise database management system. Figure 7 3.