• Journal of IKEEE
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• v.24 no.4
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• pp.1184-1187
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• 2020

This paper proposes an in-vehicle network controller fully exploiting the advantages of UART (Universal Asynchronous Receiver/Transmitter) and CAN (Controller Area Network). UART is used in 1-to-1 communication and it exploits parity bit for data integrity check. The proposed in-vehicle network controller converts UART into CAN, which enables multiple communications along with 1-to-1 communication. Also, the proposed in-vehicle network controller exploits CRC (cyclic redundancy check) for data integrity check, which increases communication reliability. CAN is controlled by microprocessor, but the proposed in-vehicle network controller can be controlled by any devices compliant with RS-232, RS-422, and RS-485.

• The Bulletin of The Korean Astronomical Society
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• v.37 no.2
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• pp.184.2-184.2
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• 2012

위성의 전장품은 전기적 접속을 위해서 1:1 연결을 하는 Point-to-Point 버스 방식과 여러개의 Slave (Remote Terminal)을 갖고, 일반적으로 1개의 Master (Controller)에 의해서 연결하게 되는 버스 구조를 갖는 접속 채널을 통해서 연결이 된다. 가장 많이 사용되는 방식인 MIL-STD-1553B는 데이터 전송속도가 1Mbps이고, Transformer에 의해서 완전하게 버스와 각 전장품이 완전하게 절연이 되는 구조로, 전기적 고장이 전달되는 것을 방지할 수가 있지만, 설계의 난이도가 높다. 고속 버스는 SpaceWire를 사용하고, 100Mbps이상의 속도를 지원할 수가 있지만, LVDS등의 고속 채널 설계 및 노이즈에 민감한 특성 때문에, 저속의 통신채널에서는 사용하기 어렵다. 저속의 데이터 채널을 위해서는 UART 방식이 사용된다. UART 방식은 RS-422 방식과 RS-485 방식이 사용되지만, 1553B 또는 SpaceWire 등과 같이 프로토콜이 정해지지 않아서, 사용자가 직접 프로토콜을 지정해야하는 문제가 있다. 또한 RS-422은 1:1 방식의 Point-to-Point UART를 위해서 사용되고, RS-485는 버스 방식의 연결을 지원할 수가 있지만, 동시에 여러개의 TX가 enable되는 경우에는 TX사이에 고장을 일으킬 수 있어서, 1번에 TX가 1개만 사용되도록 제어할 필요가 있다. 또한 RS-485방식의 버스를 구현할 경우에는 1553B처럼 와전하게 절연이 불가능하므로, 전기적이나 기능적으로 485버스에 문제가 발생할 경우에 절연과 같은 기능이 지원되도록 구현이 되어야 한다. 본 논문에서는 안정적인 485 UART버스 구현을 위한 기술에 대해서 평가하고 분석하도록 하겠다.

• 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.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.28 no.3
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• pp.294-300
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• 1995

In aquaculture industrial field, an automatic management and control system is needed to cope with the difficulties such as expensive wage, ripe age of management worker and risk according to the unexpected change of environmental conditions in the aquarium. This paper introduces an automatic aquarium monitoring and control system. The system is developed using PC single board computer. A PC can be connected to multi-single hoard computers, and the communication between PC and single board computers is based on RS-422/485 interfacing method. The physical data of pH, DO, temperature and water level etc. are real-timely treated in the single board computer though individual transducers, transfered to the main monitoring PC through RS-422/485 communication, and those data are graphically shown on the PC monitor. Furthermore, the environmental circumstance can be monitored through the image processing system, and the emergency system can be operated under the condition of environmental incident such as electric power stoppage, DO deficiency, pump shut down and low level water etc.

• Journal of the Institute of Electronics and Information Engineers
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• v.51 no.10
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• pp.235-242
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• 2014

LED lighting control technique is one of the ongoing research areas for efficient management of LED lighting. In this paper, we design and implementation of LED street lighting remote control system which have a wired and wireless communication function for LED street lighting remote control. The implemented system can automatically dimming and individual(or consolidated) LED street lighting via RS-485/422 or Wi-Fi. In experimental results, the implemented remote control system was satisfactory for all of the desired functions.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2009.06a
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• pp.565-566
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• 2009

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.11
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• pp.2419-2422
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• 2010

The current marine internal communication systems are usually composed of NMEA0183, NMEA2000, and MiTS protocols which are located on the physical layer based on RS-422, RS-485, CAN, and EtherNet. However, general vessel communication method have a weak point that must establish the extra private line. But, the power line communication has advantage over general vessel communication method as it uses AC220V/DC24V without changing line. Therefore, we will propose a new bridge based on the DC-PLC(power Line communication) technique which support the NMEA0183 protocol inside vessel network systems.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2010.10a
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• pp.577-578
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• 2010

The current marine communication networks are usually composed of NMEA0183, NMEA2000, and MiTS protocols which are located on the physical layer based on RS-422, RS-485, CAN, and EtherNet. This paper proposes a new bridge based on the DC power line communication technique supported from the NMEA0183 to design inside marine systems.

• Journal of the Korean Society for Precision Engineering
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• v.12 no.10
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• pp.18-24
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• 1995

This paper describes a multi-computer system developed for CIM(Computer Integrated Manufacturing) system, which combines single board computers and personal computers by using RS422/485 communication and LAN. The system adopts a concept of hot run back up system based on dual CUP system of host and supervisor structure. The dual CPU system and the single board computer are respectively developed using 32 bits microcomputer and 16 bits microprocessor. 8097BH. The multi communication between two types of system is done by using RS 422/485, and also data logging computers are linked with LAN.

• Journal of Korea Multimedia Society
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• v.20 no.3
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• pp.511-519
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• 2017

This Paper introduces the design and communication method between PLC (Programmable Logic Controller) and Arduino based on MODBUS Protocol. MODBUS connection can be established in a new or existing system very easily, therefore we used this protocol in our proposed system. In the field of automatic devices, multi-function serial port such as RS232, RS422, RS485, and so on creates a great convenience to the developer. This proposed system used RS485 as a key mediator for data exchanging on a connected network. We also believe that it will reduce the development cost in various automated industry because this system can be reused or can be implemented any such PLC installed machines. RS485 is used as a communication interface between PLC (as a slave) and Arduino (as a master), through which a reliable network is created for safe and fast communication. Furthermore, RS485 allows multiple devices(up to 32) to communicate at half duplex on a single pair of wires and provides a long connectivity area (up to 1200 meters) as compare to other device, which makes it a user-friendly for various devices in the automated industry. Moreover, Arduino can play as a mediator by connecting third party device and setup a communication network with PLC.