Bus Communication System Research Articles

Design of OFDM‐based two‐wire bus communication system for fire safety

SummaryIntelligent fire safety systems place higher demands on the speed and reliability of data communication between sensors, controllers, and other devices. The two‐wire bus has become a significant trend in developing fire safety communication systems because of its low cost and simple maintenance. This paper proposes a two‐wire bus communication system for fire safety based on orthogonal frequency division multiplexing (OFDM) technology. First, we introduce the low‐voltage power line channel model and conduct relevant simulations, providing the conditions for subsequent simulation work. Then, we design the system's transmission and reception schemes, provide the parameters, and introduce each technology used. Finally, we conducted system simulations based on three different channel models, and the system performance is compared among different encoding, modulation, and channel estimation methods. The simulation results show that the system designed in this paper has superior performance compared with other systems and can meet the requirements of intelligent fire safety systems for communication speed and reliability.

Development and implementation of a laser headlight system for electro‐optic characteristic measurement and comparison

SummaryIn this study, a laser headlight driving controller (LHDC) using the controller area network (CAN)‐bus communication system was developed and implemented for vehicle headlight applications. To observe temperature variations that influence the forward‐bias voltage and optical power of laser diodes, the laser diode was placed in an ambient temperature‐testing chamber to measure the electro‐optic characteristics and calculate the electro‐optic conversion efficiencies. The optical power and conversion efficiency values obtained at different temperatures (from negative to positive temperatures) when optical power adjustment was executed using analog and pulse‐width modulation technologies were compared. Moreover, a human‐machine operating interface was developed using the LabVIEW software. Therefore, the LHDC and laser optical power can be controlled using a computer through the CAN‐bus communication system to control the LHDC and monitor it.

Research on Multi-master Communication System Based on RS485 Bus

This paper introduces an RS485 bus communication system that can support multi-host online. The communication system is based on the basic communication principle of the single chip microcomputer, combined with the function of the RS485 chip, utilizes the characteristics of the triode, and realizes the communication mode of the multi-host node on the conventional half-duplex master-slave working mode RS485 bus. This key point realization marks the fact that the RS485 bus supporting multi-host node two-way all-digital communication becomes a reality. At the same time, the communication system combines the lightning protection and surge protection requirements, and provides a solid foundation for the RS485 bus fieldbus control system FCS (Fieldbus Control System) based on RS485 bus.

Design and Implementation of Campus Card in Shower System

s: This paper analyzes the application characteristics of campus smart card and electronic account, from the students requirements of shower management, made some research and Study on the campus smart card electronic account application and the CAN bus data transmission and developed a general admission fee based on network of campus card and CAN bus communication system, realize no cash operation in the finance charge project. This paper is discussed in detail from the communications and design payment system, interface, security aspects, and provides a reference of smart card application for the similar colleges.

The Design of CAN Bus Communication System Based on MCP2515 and S3C2440

CAN bus was widely used in embedded system development, but most embedded processors without CAN bus controller, need to extend external CAN bus interface through external bus. In order to send and receive the CAN bus data by S3C2440 chip, interface function of S3C2440 was extended by MCP2515 chip in the paper, which was used the SPI interface to extend CAN bus interface. The design of CAN bus hardware interface was described in the paper. The design of CAN device drive program on the embedded Linux operating system was specified in detail.

Communication System Design Based on TMS320F2407 with CAN Bus

In order to keep the communication fast and stable between a variety of control modules, the CAN bus communication system was designed in this paper. CAN bus communication system was designed as follow: the eCAN module of DSP chip TMS320F2407 was applied as CAN controller and the chip SN65HVD230 was applied as CAN transceiver, a variety of control modules was linked by the bus. For illustration, the chassis communication of a security robot is utilized to show how the CAN bus works. Empirical results show that the chassis communication of robot security is fast and stable with CAN bus. The CAN bus communication system designed in this paper can solve the unstable problem in the communication between control modules; it can be promoted to other control system.

Digital Research of Unmanned Aerial Vehicle Avionics System Based on CAN Bus

Small unmanned aircraft for civil and military has a wide range of applications. The design of traditional UAV avionics system is use discrete lines which link one point to another to communicate. It will make the system complexity, and the anti-jamming performance is poor. A new kind of design idea of unpiloted aircraft digital avionics system based on CAN bus is introduced, and this article also made a further study in the avionics systems’ critical subsystems, components and redundant design. The new avionics system, which used bus communication system has many good points, such as strong anti-interference ability, easily extended, simply configuration and so on. The system also has a certain value to promotion.

Design of Bus Communication System using Matlab

us communication system was established mainly using Sim Events module in the software of Matlab/Simulink. Performance indexes of bus system, which embraces worst-case response time of messages and bus load, were separately gained by theoretical calculation, experiments in Matlab and CANoe. The calculation and experiment results were compared sufficiently, and it concludes that bus system established in Matlab/Simulink can efficiently represent the message transfer sequences on the bus, and achieve an exact result of the performance analysis of the bus system. With bus system established in Matlab/Simulink, test modules for ECU (Electric Control Unit) testing can conveniently be created, and it is an efficient testing tool for bus system design.

Optical link in the Delft Parallel Processor — an example of MOMI-connection in MIMD-supercomputers

Much attention is given to the problem how to avoid transfer-bound processing in MIMD supercomputers. The interactivity between processing tasks is compared with the interconnectability that exists between processors in the case of a multi-bus communication system. For this purpose quantitative measures are introduced for both the task interactivity and the processor interconnectability. For a MIMD computer with p processors and p busses the asymptotic speed-up is proportional to p both for tightly and loosely coupled tasks. For tightly coupled tasks a still larger speed-up can be achieved by taking more than p busses. For a MIMD computer with p processors in the case of 2-level parallelization considerably more speed-up can be obtained, but that requires at the 2nd level of parallelization p powerful interconnects (one per processor). Full processor interconnectability is ideal in the sense that no queueing problems can arise. In case of 1-level parallelization with p processors full interconnectability requires p 2 (one-word wide) interconnections. In the Delft Parallel Processor (DPP), instead of using a p 2-tuple bus communication system, for this purpose a multibroadcast system with p data channels has been applied, where each data channel has p taps (one per processor) and each processor has a p-tuple accessible input memory (one input per channel). In the DPP84 (with maximally 16 processors) electric data channels have been applied. But for technical reasons for large p full interconnectability is only feasible by the way of optical data channels. This optical interconnect must be provided with electro-to-optic (E/O) and opto-to-electric (O/E) transducers as long as optical computing is not yet practically possible. The resulting Electro-Optic Communication System (EOCS) will be implemented in the DPP8X. The EOCS will consist of a combination of guided-wave and a p-tuple way starcoupler technique. Special E/O and O/E transducers have to be developed as well. An intelligent Opto-Electric logic element, the POWERRAM, is realized as a prototype p-tuple accessible input memory IC, capable to accept the multidata stream at the input of a processor in one clock cycle.