• Title, Summary, Keyword: RS-232C

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A study of multi protocol communication on single serial interface (Serial 전송라인에서 Multi-Protocol 통신의 구현 연구)

  • Lee, Jae-Cheol;Ko, Dae-Sik
    • The Journal of Advanced Navigation Technology
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    • v.12 no.5
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    • pp.464-469
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    • 2008
  • The RS-232C (Unbalanced serial) and RS-485 (balanced serial) are standard in serial communication. RS-485 uses a differential electrical signal, as opposed to unbalanced signals referenced to ground with the RS-232. Differential transmission, which uses two lines each for transmit and receive signal results in greater noise immunity and longer distances as compared to the RS-232C. The greater noise immunity and distance are big advantages in industrial environments. In general, one protocol on one serial interface is very normal application. In this study, we implemented multi protocols on one serial RS-485 interface and examine the performance and result with hanging multi equipments.

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Implementation of two wire RS232C Serial Communication Interface using CSMA protocol (충돌검지 다중접속 프로토콜에 의한 2선식 RS232C 직렬통신 인터페이스 구현)

  • 한경호;최천원
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.17 no.3
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    • pp.11-17
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    • 2003
  • In this paper, we implemented 2-wire (data gnd) RS232C serial communication interface by applying the Collision Sensing Multiple Access(CSMA) Protocol. The transmitting and receiving wires of RS232C pert are connected together by the interface circuit forming data wire without hardware modification On two-wired common channel connection simultaneous transmission Don mere than two hosts causes data collision. The collision is detected by loop-back test of transmission data comparing with the fed back data to detect the data distortion. Various models are adopted to reduce the probability of retransmitted data collision and experiments show the performance of each cases. Due to allowing multiple hosts to be accessed through the common communication channel with minimum circuit addition the result of this paper can be easily applied for conventional RS232C instruments and machines to connect to the single data communication line.

Monitoring system design&Implementation using wireless solution (무선 통신을 사용한 모니터링 시스템의 설계 및 구현)

  • Jeon Yoon-Ho;Woo Jong-Hyun;Kim Young-Ryun;Kim Hee-Dong
    • 한국정보통신설비학회:학술대회논문집
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    • pp.39-42
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    • 2002
  • RS-232C는 정보기기들을 연결하는 직렬통신 표준으로, 간단한 구조로 인해, 복잡한 요구 조건이 없는 상용 기기들의 제어 및 감시용으로 사용되고 있다. 최근 무선동신기술이 발전함에 따라, 저가격의 무선통신 기술을 활용하여 무선 RS-232C에 대한 요구가 늘어나고 있다. 무선 RS-232C로 기존 유선의 RS-232C를 대체함으로서, 기존 시스템의 변경없이 편리한 접속기능을 대체한 수 있을 것이다. 본 논문에서는 유선 RS-232C를 대체하는 무선 RS-232C 모듈을 채용하여, 전력제어에 사용하는 배전자동화 장치의 관리를 간편하게 하는 시스템의 구현에 대해서 다루고 있다. 배전 자동화시스템은 일종의 SCADA시스템의 일부로서, 통신 프로토콜로서 산업용 DNP3.0을 사용하고 있다. 무선 RS-232C 링크의 신뢰성을 확보하기 위하여, 무선 구간에 DNP3.0을 채택하였으며, 무선 통신방식으로는 무선 RF, 블루투스(Bluetooth), 무선랜(wireless LAN)등 3가지 방식을 채용하여, 설계, 구현내용을 기술하였다.

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Implementation of a Communication Algorithm between Actuator Controller and Manufacturing System (제조 시스템과 제어기 사이의 통신알고리즘 구현에 관한 연구)

  • Jeong, Hwa-Young;Hong, Bong-Hwa;Kim, Eun-Won
    • 전자공학회논문지 IE
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    • v.46 no.2
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    • pp.46-52
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    • 2009
  • The manufacturing system was used to communicate between controller and GUI system by RS232C. The controller is deal with processing the equipments such as cylinders, motors, sensors, and so on. The Gill system received the signal from actuator controller by direct communication ways, RS232C, and presented the data to user to analyze the all of status for manufacturing system. In this point, it is important that communication use the RS232C. The way is helpful to be able to reduce cost, have simple structure, and easily maintain the stable communication status. Otherwise, the way has some problem to loss signal or data under the high speed communication. So it needs to complement the communication process to without loss data. In this research, we made the communication algorithm and implement the process to reduce losing data when it send or receive the signal using RS232C between controller and manufacturing system.

Design and Implementation of the JAVA Serial Communication Program to Control the Industrial Digital Indicator (산업용 디지털 지시계 제어를 위한 자바 시리얼 통신 프로그램의 설계와 구현)

  • Kim, Tai-Suk;Kim, Jong-Soo;Lee, Jung-Hwa
    • Journal of Korea Multimedia Society
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    • v.14 no.6
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    • pp.794-801
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    • 2011
  • Main machinery in the factory have various digital indicator to display its operating data for the manager. It is useful to control these datum at the remote office for factory automation in order to increase machine productivity. It is easy to use Ethernet infrastructure for remote communication. But most of all machinery in domestic factories still support RS232c or RS485 serial communication way. In this case to control machinery datum on the ethernet base, it is need to change RS232C or RS485 data to ethernet base. In this paper, in order to develop a remote progress management system through the wireless Internet, we show a design method to make easy maintenance by developing the system with both the JAVA language and RxTx Package for RS232c serial communication. For the system implementation, we added the digital indicator connect with a thermo couple to a machine which provide the real time status data of temperature. To connect machines management server program, we set up a convertor to change the RS485 data to the RS232c and also another convertor to change the RS232c data to wireless ethernet.

Implementation of RS232C and TCP/IP Connection Device Using ARM Processor (ARM프로세서를 이용한 RS232C와 TCP/IP 접속장치의 구현)

  • Lee, Young-Jun;Han, Kyong-Ho
    • Proceedings of the KIPE Conference
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    • pp.635-638
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    • 2002
  • In this paper, the connection device of RS232C and TCP/IP implementation using ARM processor and LINUX is proposed. Data interaction flash memory the multiple serial ports are transferred to ARM processor and the data are processed and formed into data packet for transfer via internet protocol. Packet flash memory Internet is decoded to extract the serial port data. The serial ports supports RS232C asynchronous protocol communication and control program is developed in GNU-C and installed in the on-board memory for packet conversion and control. The research result can be applied to terminal server, printer server and multiple serial ports equipments.

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Design and Implementation of Progress Management System Using Swing Component Based on Internet (Swing 컴포넌트를 이용한 인터넷 기반 공정관리시스템 설계와 구현)

  • Kim, Tai-Suk;Kim, Jong-Soo
    • Journal of Korea Multimedia Society
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    • v.13 no.8
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    • pp.1163-1170
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    • 2010
  • In this paper, in order to develop a remote progress management system through the Internet, we show a design method to make easy maintenance by developing the system with both the JAVA language and GoF Design Patterns. For the system implementation, we added the RS232C and RS422/RS485 communication modules to PLC(Programmable Logic Controller) in the control box which provide the real time status data of machines. Also we set up the RS232C to Ethernet converter based on wireless environment to communicate the PLC control data. We use JAVA Swing components to implement the multi-tier architecture system supported the GUI of the Applet and Frame at the same time so that the manager grasps the progress of work easily at the remote machines through the Internet. The key objective of the multi-tier architecture is to share resources among clients, this proposed system can help to develop the software to control the remote machine, and also it has the advantage that developer who wants to make a similar software can make easy to add new function reusing the existing codes.

Implementation of RS232C Serial Communication by CSMA protocol (충돌검지 다중접속(CSMA) 프로토콜에 의한 RS232C 직렬통신의 구현)

  • Kwak, Hee-Soo;Han, Kyong-Ho
    • Proceedings of the KIEE Conference
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    • pp.2473-2475
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    • 1998
  • In this paper, we implemented RS232C serial communication by the 2 wires(Data,GND), and multiple access, by the applying Collision Sensing Multiple Access(CSMA) Protocol. Multiple access is implemented by assigning a unique ID to each controller. The multiple access control operation starts by sending a command packet from a host to another host and the command packet is composed of ID bytes of source and target host computer, data bytes and the check sum, byte. In host computer, after sending command packet, the collision from loop back data. If collision is detected, it means a command packet was collided with another command packet for another host. The packet communication of the controller enables the multiple acces of the controller through the common serial data link. The application of this serial communication through CSMA protocol and the usage of two wires, have an effect on saving the wires and convenient of layout work.

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A White Balance System for PDP TV (PDP TV에서 인간 시각을 고려한 최적의 White Balance 구현)

  • 정기백;구본철
    • Proceedings of the IEEK Conference
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    • pp.363-366
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    • 2003
  • We propose the system that automatically adjusts the white balance on display products to a standard value according to several nations. We replace manual or semi-auto method with fully automatic method using windows application program. And we use RS-232C serial interface to communicate PC with display products which we want to adjust white balance. The PC generates patterns for measuring color information and Color Analyzer measures color and brightness. This value is transmitted through RS-232C serial interface to PC. The PC's algorithm analyzes this information and then decides which RGB Gain value is best for optimal white balance. This RGB Gain value is transmitted through RS-232C serial interface to display products. The modified color value is measured again and feed back to PC. This sequence is repeated until optimum white balance is obtained.

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Design and Development of Reliable Measurement System for Mobile Phones through RS-232C communication (RS-232C 통신을 이용한 무선 이동단말기 신뢰성 측정시스템 설계 및 구현)

  • 옥경달;이상범;김민석
    • Proceedings of the Korean Information Science Society Conference
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    • pp.613-615
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    • 2004
  • 무선 통신 가입율이 높아지면서 무선 이동단말기와 기지국간의 QoS(Quality of Service) 즉, 통신품질을 향상을 위해 기지국의 간섭을 최소화, 네트워크 접속 성공률 증가, 이동통신 회사간의 네트워크 호환성 등이 서비스를 판단하는 중요한 기준이 된다. 본 논문에서는 단말기의 발신/착신에 대한 네트워크 연결 성공률은 중요한 판단 기준으로 RS-232C 통신을 이용하여 QoS 중에서 무선 이동단말기와 기지국간에 발신 테스트 과정을 바탕으로 무선 이동단말기의 신뢰성을 측정하여 보다 안정적인 이동 단말기 개발 환경을 구축할 수 있는 시스템을 설계 및 구현하였다.

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