KR970009059A - Communication port protection circuit of multi-drop communication system - Google Patents

Communication port protection circuit of multi-drop communication system Download PDF

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Publication number
KR970009059A
KR970009059A KR1019950019807A KR19950019807A KR970009059A KR 970009059 A KR970009059 A KR 970009059A KR 1019950019807 A KR1019950019807 A KR 1019950019807A KR 19950019807 A KR19950019807 A KR 19950019807A KR 970009059 A KR970009059 A KR 970009059A
Authority
KR
South Korea
Prior art keywords
communication
communication interface
interface means
line
protection circuit
Prior art date
Application number
KR1019950019807A
Other languages
Korean (ko)
Inventor
김형배
Original Assignee
김광호
삼성전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 김광호, 삼성전자 주식회사 filed Critical 김광호
Priority to KR1019950019807A priority Critical patent/KR970009059A/en
Publication of KR970009059A publication Critical patent/KR970009059A/en

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Abstract

1. 청구범위에 기재된 발명이 속한 기술분야1. TECHNICAL FIELD OF THE INVENTION

멀티-드롭방식을 채용한 통신시스템에 관한 것이다.A communication system employing a multi-drop method.

2. 발명이 해결하고자 하는 기술적 과제2. Technical problem to be solved by the invention

멀티-드롭에 연결된 각 통신단말들중 일부의 고장으로 인해 통신시스템 전체가 오동작하거나 통신 불능상태가 되는 것을 방지한다.The failure of some of the communication terminals connected to the multi-drop prevents the whole communication system from malfunctioning or becoming inoperative.

3. 발명의 해결방법의 요지3. Summary of Solution to Invention

멀티-드롭 통신선로와 해당 통신단말 사이에 송수신되는 신호를 인터페이스하기 위한 통신 인터페이스수단과 통신선로간의 연결라인을 단속하기 위한 스위칭수단을 구비하여 통신 인터페이스수단을 통해 데이타를 송신한 후 일정시간이 경과할때까지 응답이 없을 경우 스위칭수단을 제어하여 연결라인을 절단한다. 또한 연결라인을 절단한 후 통신 인터페이스수단의 송신단자에 임의의 데이타를 송신한 다음에 통신 인터페이스수단의 수신단자의 데이타를 확인하여 상이하거나 수신되지 않을 경우 절단상태를 계속 유지한다.A communication interface means for interfacing the signals transmitted and received between the multi-drop communication line and the corresponding communication terminal and a switching means for controlling the connection line between the communication lines are provided, and a predetermined time elapses after transmitting data through the communication interface means. If there is no response until then, cut off the connection line by controlling the switching means. Also, after cutting the connection line, any data is transmitted to the transmitting terminal of the communication interface means, and then the data of the receiving terminal of the communication interface means is checked to maintain the cutting state if it is different or not received.

4. 발명의 중요한 용도4. Important uses of the invention

RS-485방식 통신시스템RS-485 communication system

Description

멀티-드롭방식 통신시스템의 통신포트 보호회로Communication port protection circuit of multi-drop communication system

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제2도는 본 발명에 따른 통신포트 보호회로도.2 is a communication port protection circuit diagram according to the present invention.

Claims (4)

하나의 통신선로에 다수의 통신단말이 멀티-드롭방식으로 연결되는 통신시스템의 통신포트 보호회로에 있어서, 상기 통신선로와 해당 통신단말 사이에 송수신되는 신호를 인터페이스하는 통신 인터페이스수단과, 상기 통신 인터페이스수단과 상기 통신선로간의 연결라인을 단속하기 위한 스위칭단과, 상기 통신 인터페이스수단을 통해 데이타를 송신한 후 일정시간이 경과할때까지 응답이 없을 경우 상기 스위칭수단을 제어하여 상기 연결라인을 절단하는 제어수단을 구비하는 것을 특징으로 하는 통신포트 보호회로.A communication port protection circuit of a communication system in which a plurality of communication terminals are connected to one communication line in a multi-drop method, comprising: communication interface means for interfacing a signal transmitted and received between the communication line and the communication terminal, and the communication interface A switching stage for interrupting the connection line between the means and the communication line, and controlling the switching means to cut the connection line if there is no response until a predetermined time elapses after transmitting data through the communication interface means. Communication port protection circuit comprising a means. 제1항에 있어서, 상기 통신 인터페이스수단이 RS-485 통신 칩인 것을 특징으로 하는 통신포트 보호회로.The communication port protection circuit according to claim 1, wherein said communication interface means is an RS-485 communication chip. 하나의 통신선로에 다수의 통신단말이 멀티-드롭방식으로 연결되는 통신시스템의 통신포트 보호회로에 있어서, 상기 통신선로와 해당 통신단말 사이에 송수신되는 신호를 인터페이스하는 통신 인터페이스수단과, 상기 통신 인터페이스수단과 상기 통신선로간의 연결라인을 단속하기 위한 스위칭수단과, 상기 통신 인터페이스수단을 통해 데이타를 송신한 후 일정시간이 경과할때까지 응답이 없을 경우 상기 스위칭수단을 제어하여 상기 연결라인을 절단하고 상기 통신 인터페이스수단의 입력단자에 임의의 데이타를 송신한 다음에 상기 통신 인터페이스수단의 출력단자의 데이타를 확인하여 상이하거나 수신되지 않을 경우 상기 절단상태를 유지하는 것을 특징으로 하는 통신포트 보호회로.A communication port protection circuit of a communication system in which a plurality of communication terminals are connected to one communication line in a multi-drop method, comprising: communication interface means for interfacing a signal transmitted and received between the communication line and the communication terminal, and the communication interface Switching means for controlling the connection line between the means and the communication line, and if there is no response until a certain time elapses after transmitting data through the communication interface means to control the switching means to cut the connection line And transmitting the arbitrary data to the input terminal of the communication interface means and then checking the data of the output terminal of the communication interface means to maintain the disconnected state if it is different or not received. 제3항에 있어서, 상기 통신 인터페이스수단이 RS-485 통신 칩인 것을 특징으로 하는 통신포트 보호회로.The communication port protection circuit according to claim 3, wherein said communication interface means is an RS-485 communication chip. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950019807A 1995-07-06 1995-07-06 Communication port protection circuit of multi-drop communication system KR970009059A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019950019807A KR970009059A (en) 1995-07-06 1995-07-06 Communication port protection circuit of multi-drop communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019950019807A KR970009059A (en) 1995-07-06 1995-07-06 Communication port protection circuit of multi-drop communication system

Publications (1)

Publication Number Publication Date
KR970009059A true KR970009059A (en) 1997-02-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019950019807A KR970009059A (en) 1995-07-06 1995-07-06 Communication port protection circuit of multi-drop communication system

Country Status (1)

Country Link
KR (1) KR970009059A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101224523B1 (en) * 2011-06-13 2013-01-22 주식회사 코맥스 Sensing circuit for mailfunction of data line of multi-drop communication circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101224523B1 (en) * 2011-06-13 2013-01-22 주식회사 코맥스 Sensing circuit for mailfunction of data line of multi-drop communication circuit

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