• 전기학회논문지
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• 제56권4호
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• pp.799-808
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• 2007

BACnet is an international standard communication protocol especially designed for building automation and control systems. BACnet uses the Master-Slave/Token-Passing (MS/TP) protocol as one of its field-level networks. A BACnet MS/TP field controller prototype and MS/TP network monitoring system are developed in this study. This report introduces the design and implementation methodology of a BACnet MS/TP field controller hardware, firmware and protocol stack. This report also presents the implementation methodology of BACnet MS/TP network monitoring system using VTS (Visual Test Shell). The methodologies introduced in this report will facilitate the develop and implementation of the BACnet-based control systems in building automation area.

• 제어로봇시스템학회논문지
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• 제12권11호
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• pp.1144-1155
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• 2006

Digital communication networks have become a core technology in advanced building automation systems. BACnet(Building Automation and Control networks) is a standard data communication protocol designed specifically for building automation and control systems. BACnet adopts Master-Slave/Token-Passing(MS/TP) protocol as one of its field level networks. In this study, we introduce a method of implementing a bandwidth allocation scheme in the MS/TP protocol. The bandwidth allocation scheme improves the capability of real-time communication of the original MS/TP protocol. The bandwidth allocation scheme introduced in this paper can be easily implemented in the existing MS/TP protocol with a slight modification. In this study, we actually developed the hardware and firmware of the modified MS/TP communication module in which the bandwidth allocation scheme is implemented. Using the modified MS/TP communication module, we developed an experimental model in order to examine the validity of the bandwidth allocation scheme in the MS/TP protocol. Experimental results show that the modified MS/TP protocol satisfies the requirements of real time communication for periodic and urgent messages of BACnet communication services.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 학술대회 논문집 정보 및 제어부문
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• pp.52-55
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• 2004

Digital communication networks have become a core technology in advanced building automation systems. BACnet(${\underline{B}}uilding$ ${\underline{A}}utomation$ and ${\underline{C}}ontrol$ ${\underline{net}}works$) is a standard data communication protocol designed specifically for building automation and control systems. BACnet adopts Master-Slave/Token-Passing (MS/TP) protocol as one of its field level networks. In this study, we introduce a method of implementing bandwidth allocation scheme in the MS/TP protocol. The bandwidth allocation scheme improves the capability of real-time communication of the original MS/TP protocol. The bandwidth allocation scheme introduced in this paper can be easily implemented in the existing MS/TP protocol with a slight modification. In this study, we actually developed the hardware and firmware of MS/TP module in which bandwidth allocation scheme is implemented.

• International Journal of Control, Automation, and Systems
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• 제5권5호
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• pp.584-593
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• 2007

BACnet is a standard data communication protocol especially designed for building automation and control networks. BACnet uses the Master-Slave/Token-Passing (MS/TP) protocol as one of its field-level networks. In this study, the performance of the BACnet MS/TP protocol is evaluated using an experimental model. The network performance is investigated and evaluated in terms of token rotation time and round trip time. The experimental results show that the performance of the MS/TP network is heavily influenced by the network traffic load, the assignment of MS/TP node address and the network configuration parameter called $N_{max_info-frames}$. Based on the experimental results, simple practical designing guidelines for BACnet MS/TP network systems are also proposed.

• 대한전기학회논문지:시스템및제어부문D
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• 제54권11호
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• pp.660-668
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• 2005

Digital communication networks have become a core technology in advanced building automation systems. BACnet (Building Automation and Control networks) is a standard data communication protocol designed specifically for building automation and control systems. BACnet adopts Master-Slave/Token-Passing (MS/TP) protocol as one of its field level networks. Tn this study, we introduce a method of implementing bandwidth allocation scheme in the MS/TP protocol. The bandwidth allocation scheme improves the capability of real-time communication of the original MS/TP protocol. The bandwidth allocation scheme introduced in this paper can be easily implemented in the existing MS/TP protocol with a slight modification. In this study, we examined the validity of bandwidth allocation scheme using simulation models. The results from the simulation experiment show that the proposed scheme satisfies the requirements of real-time communication.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.1744-1745
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• 2011

네트워크 기반 제어시스템에서 상위 제어시스템의 성능은 하부 네트워크 시스템의 성능에 의해 직접적으로 영향을 받는다. 따라서 네트워크 기반 빌딩자동제어 시스템 역시 하부 네트워크 시스템의 동작 및 성능에 의해 직접적으로 영향을 받는다. 본 연구에서는 빌딩자동제어시스템을 위한 데이터 통신 프로토콜로 개발되었으며, ISO에 의해 국제 표준 규격으로 제정된 BACnet의 하부 데이터링크 계층 프로토콜 중 필드레벨 네트워크 프로토콜로 가장 많이 적용되고 있는 BACnet MS/TP프로토콜 기반 네트워크 시스템의 성능을 실험적으로 해석하는 방법에 대해 소개한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.1746-1747
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• 2011

BACnet(Building Automation and Control Network)은 빌딩 자동제어 시스템을 위해 개발된 데이터 통신 프로토콜로 ISO에 의해 국제 표준규격으로 제정되었으며, 지난 20여 년간 미국과 유럽을 중심으로 연구 및 개발이 활발히 진행되고 있다. 그러나 국내의 경우 아직까지 개발사례 및 연구활동이 미비한 실정이다. 이에 본 연구에서는 BACnet MS/TP 프로토콜 기반 네트워크 시스템의 실험적 성능해석을 위한 네트워크 모니터링 시스템의 개발 사례를 소개함으로써 BACnet의 국내 기술보급 및 기술확산에 기여하고자 한다.

• 대한전기학회논문지:시스템및제어부문D
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• 제52권6호
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• pp.359-364
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• 2003

BACnet is a standard data communication protocol for building automation and control systems. MS/TP is most widely used LAN protocol for data communication among field devices in the BACnet-based building automation. In this study, the performance of MS/TP protocol is investigated using a simulation model. This study evaluates the delay characteristics of MS/TP being used to deliver a BACnet application service. Analysis of the simulation results was used to identify the network parameters that influence the performance of BACnet application service and to develop recommendatioins that should be considered when designing and operating BACnet systems.

• 전기학회논문지
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• 제61권11호
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• pp.1676-1681
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• 2012

In network-based control system, measurement and control information is delivered by the network messages. Therefore, the performance of control system is directly affected by the performance of network system. System engineers need to evaluate the performance of network system to maintain the entire system in stable condition. BACnet is an international standard data communication protocol especially designed for building automation and control systems. In this study, experimental performance evaluation methodologies of BACnet MS/TP protocol and their practical evaluation results are presented.

• 한국도시환경학회지
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• 제18권4호
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• pp.455-463
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• 2018

본 연구는 영산강 수계에 위치한 하천의 표층 퇴적물 중 유기물과 영양염류들의 농도 분포와 오염도를 평가하기 위하여 수행하였다. 표층 퇴적물 시료는 2015년부터 2016년까지 2년 동안 하천 중 본류 12개 및 지류 4개 지점으로부터 채취하여 입도와 유기물(Ignition Loss, COD, TOC) 및 영양염류(TN, TP, SRP)를 분석하여 평가하였다. 입도 분포는 상류와 하류로 구분하여 모래와 양질사토가 우세하였으나, 상류에 보가 설치된 MS3와 MS6 지점의 경우 각각 양질사토와 미사양토로 나타났다. 상관성 평가 결과, 유기물 항목들은 입도들과 강한 상관관계를 보인 반면 TN을 제외한 영양염류 항목들은 약하게 나타났다. 유기물 및 영양염류 농도의 분포 특성은 상류보다 하류 그리고 보가 설치된 지점들에서 높았고, 특히 MS3 지점의 TP 농도는 상반기보다 하반기에 높은 특성을 보였다. 국내외 오염기준과 비교 평가한 결과, 유기물 및 영양염류 항목들은 전 지점들에서 심각한 오염상태가 아닌 것으로 평가되었다.