Communication Protocol Software Research Articles

CAN bus network design of bifurcated power electric tractor

The traditional wiring connection of tractors faces difficulty in meeting the requirements of information sharing, high real-time performance, and high reliability among the electronic control units of electric tractors. This study takes a bifurcated power electric tractor as an example and designs the CAN communication network system of a bifurcated power electric tractor on the basis of ISO 11783 protocol. On the basis of the structural form and operation characteristics of the bifurcated power electric tractor, the CAN communication network nodes are divided, and the functions of each node are defined. This study aims at four common network topologies. A mathematical model is established on the basis of graph theory, the total information per second T and the node information per second Z of each structure are analyzed and compared, and the communication network of the electric tractor is designed by using high- and low-speed dual-bus structure. The communication protocol and system software design are developed on the basis of the ISO 11783 protocol. The hardware function and communication effect of the communication system are tested by dSPACE simulation platform and CANoe software. Test results show that the communication effect of the designed CAN bus network system is good, and the bus load rate is approximately 12%. This study provides a reference for the design of CAN communication network system for electric tractors.

Communication Module Design of Offshore Drilling Platform Cleaning Robot

Communication module design is one of the key technologies in offshore drilling platform cleaning robot, through overall design and analysis of communication systems, the communication module is selected and technology roadmap is analyzed. thus communication module hardware architecture (PC, PLC and multi-sensor ) is designed, multi-sensor (Sonar, infrared, camera, SINS, pressure sensors and fiber optic gyrocompass) underwater monitor is designed and selected, the system software is programmed (PC configuration software, PLC software and communication protocol software); Finally, control structure and running track is designed. The research ensures the operation accurately and improves the cleaning efficiency.

Application and Research of Agricultural Irrigation Fertilization Intelligent Control System Based on GPRS DTU

This paper developed a intelligent control system that can fertigate according to crops’ requirements. At first, the overall composition of this system was expounded. It used kingview 6.55 and measurement and control center software as the development platform, and HORNER OCS as the core controller, and it constructed agricultural fertigation control system. The communication module is GPRS DTU, and the system pressure adjustment was achieved by frequency converter. Secondly, related technology such as communication protocol, port mapping, dynamic DNS and peanut shells software was introduced. The system software development, database design and public based on the Internet was completed. The system test results show that the system was fully function, stable running, and met actual demand of water and fertilizer management in agriculture.

UML-Based Model-Driven Development for HSDPA Design

This article examines using model-driven development (MDD) with UML for communication protocols. The authors believe this approach is essential for reducing the costs of developing, maintaining, and evolving complex software systems. However, is this statement valid for communication protocol software? Such software's stringent performance and robustness requirements are critical for embedded devices in modern mobile and cellular networks. To compare UML-based MDD with a code-centric approach, the authors developed two versions of a fully functional High-Speed Downlink Packet Access (HSDPA) prototype. Experiments show that the development process was easier with UML-based MDD than with the code-centric approach, without sacrificing performance.

SOFTWARE ARCHITECTURE DECOMPOSITION USING ATTRIBUTES

Software architectural design has an enormous effect on downstream software artifacts. Decomposition of function for the final system is one of the critical steps in software architectural design. The process of decomposition is typically conducted by designers based on their intuition and past experiences, which may not be robust sometimes. This paper presents a study of applying the clustering technique to support system decomposition based on requirements and their attributes. The approach can support the architectural design process by grouping closely related requirements to form a subsystem or module. In this paper, we demonstrate our experiments in applying the approach to an industrial communication protocol software system and comparing several clustering algorithms. The result obtained from WPGMA (weighted pair-group method using arithmetic averages) shows closer resemblance than other clustering methods to the one developed by the designer.

Designing communication protocol software for performance

Performance objectives need to be built into the design of time-critical protocols. This letter presents software design and architectural guidelines that could be used to meet performance requirements, and considers other software design requirements, including portability and its effect on performance.

Optimization of a low-cost truly preemptive multitasking PC diagnostic workstation.

The Windows 95/NT operating systems (Microsoft Corp, Redmond, WA) currently provide the only low-cost truly preemptive multitasking environment and as such become an attractive diagnostic workstation platform. The purpose of this project is to test and optimize display station graphical user interface (GUI) actions previously designed on the pseudomultitasking Macintosh (Apple Computer, Cupertino, CA) platform, and image data transmission using time slicing/ dynamic prioritization assignment capabilities of the new Windows platform. A diagnostic workstation in the clinical environment must process two categories of events: user interaction with the GUI through keyboard/mouse input, and transmission of incoming data files. These processes contend for central processing units (CPU) time resulting in GUI "lockout" during image transmission or delay in transmission until GUI "quiet time." WinSockets and the Transmission Control Protocol/Internet Protocal (TCP/IP) communication protocol software (Microsoft) are implemented using dynamic priority timeslicing to ensure that GUI delays at the time of Digital Imaging and Communications in Medicine (DICOM) file transfer do not exceed 1/10 second. Assignment of thread priority does not translate into an absolute fixed percentage of CPU time. Therefore, the relationship between dynamic priority assignment by the processor, and the GUI and communication application threads will be more fully investigated to optimize CPU resource allocation. These issues will be tested using 10 MB/sec Ethernet and 100 MB/sec fast and wide Ethernet transmission. Preliminary results of typical clinical files (10 to 30 MB) over Ethernet show no visually perceptible interruption of the GUI, suggesting that the new Windows PC platform may be a viable diagnostic workstation option.

Object design for communication protocol software

In this paper, an object design method for communication protocol software, which is specified based on a finite state machine, is presented. In our method, an object class is defined for each state of the finite state machine. The objects designed in our method have freer granularity than that in conventional approaches. Inheritance is used in our method as a program structuring mechanism to allow incremental design. A real example is given for demonstration.

Hierarchical reachability graph of bounded Petri nets for concurrent-software analysis

Petri nets have been proposed as a promising tool for modeling and analyzing concurrent-software systems such as Ada programs and communication protocol software. Among analysis techniques available for Petri nets, the most general approach is to generate all possible states (markings) of the system in a form of a so-called reachability graph. However, this conventional reachability graph approach is inefficient or intractable, even for a bounded Petri net, due to state explosion in many practical applications. To cope with this problem, this paper proposes a method for constructing a hierarchically organized state space called the hierarchical reachability graph (HRG). Using the HRG, we obtain necessary and sufficient conditions for reachability and deadlock, as well as algorithms to test whether a given state or marking is reachable from the initial state and whether there is a deadlock state (a state with no successor states). >

The trace specification of communications protocols

A methodology for the formal specification of communications protocols is described. Communications protocol software offers special specification problems, because typically such software connects computers which are widely distributed geographically and differ in model, manufacturer and operating system. The specification method discussed is a modified version of traces, which were originally developed as a general technique for software specification. The author first describes the trace language and presents several examples. He then describes the trace methodology, illustrated with a specification of Stenning's protocol. He summarizes his experience of using the methodology to write specifications of major portions of two commercial standards: the Advanced Data Communications Control Protocol (ADCCP) and the Internet Protocol (IP). It is concluded that traces are a feasible technique for formal specification of communications protocols.