KR930022212A - Terminal transmission interface circuit for multidrop connection - Google Patents

Terminal transmission interface circuit for multidrop connection Download PDF

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Publication number
KR930022212A
KR930022212A KR1019920006090A KR920006090A KR930022212A KR 930022212 A KR930022212 A KR 930022212A KR 1019920006090 A KR1019920006090 A KR 1019920006090A KR 920006090 A KR920006090 A KR 920006090A KR 930022212 A KR930022212 A KR 930022212A
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KR
South Korea
Prior art keywords
pull
interface circuit
terminal
transmission interface
power supply
Prior art date
Application number
KR1019920006090A
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Korean (ko)
Other versions
KR940006827B1 (en
Inventor
이범철
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이범철
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 이범철 filed Critical 이범철
Priority to KR1019920006090A priority Critical patent/KR940006827B1/en
Publication of KR930022212A publication Critical patent/KR930022212A/en
Application granted granted Critical
Publication of KR940006827B1 publication Critical patent/KR940006827B1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/403—Bus networks with centralised control, e.g. polling
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/78—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/40006—Architecture of a communication node
    • H04L12/40039—Details regarding the setting of the power status of a node according to activity on the bus

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Communication Control (AREA)
  • Dc Digital Transmission (AREA)

Abstract

컴퓨터 시스템에서 복수 터미날을 하나의 모뎀에 병렬로 접속하기 위한 터미날의 멀티드롭 접속용 수신 및 송신 인터페이스회로에 있어서, 풀엎용 양전원 및 풀다운용 음전원과, 상기 터미날의 복수의 데이타 전송출력 라인들과 상기 모뎀의 대응입력 라인들간을 전기적으로 절연시키고 또한 그들사이에서 송신시 상기 출력 라인들의 신호 출력에 응답하여 상기 입력라인들을 각각 소정 전압으로 풀엎시키도록 상기 양전원에 병렬로 접속되는 풀엎용 수단들로 되는 라인 드라이버와, 비송신시 상기 입력라인들을 각각 소정전압으로 풀다운 시키도록 상기 음전원에 병렬로 접속되는 풀다운 수단들로 되는 레지스터 어레이로 구성되는 것이 특징인 터미날의 멀티드롭 접속용 송신 인터페이스회로.A reception and transmission interface circuit for a multidrop connection of a terminal for connecting multiple terminals in parallel to a single modem in a computer system, comprising: a pull-up positive power supply and a pull-down negative power supply, and a plurality of data transmission output lines of the terminal; Pull-out means electrically connected between the corresponding input lines of the modem and electrically connected in parallel to both power supplies to respectively pull down the input lines to a predetermined voltage in response to the signal output of the output lines when transmitting therebetween. And a resistor array comprising a line driver and a pull down means connected in parallel to the negative power source to pull down the input lines to a predetermined voltage when not transmitting.

Description

터미날의 멀티드롭 접속용 송신 인터페이스회로Terminal transmission interface circuit for multidrop connection

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

제3도는 본 발명에 의한 멀티드롭 접속을 나타내는 개통도.3 is an opening diagram showing a multidrop connection according to the present invention;

제4도는 본 발명에 의한 터미날의 멀티드롭접속용 송수신 인터페이스회로의 개통도.4 is an opening diagram of a transmission / reception interface circuit for a multidrop connection of a terminal according to the present invention.

제5도는 제4도의 송수신 인터페이스회로의 상세 회로도.5 is a detailed circuit diagram of the transmission and reception interface circuit of FIG.

Claims (3)

컴퓨터 시스템에서 복수 터미날을 하나의 모뎀에 병렬로 접속하기 위한 터미날의 멀티드롭 접속용 수신 및 송신 인터페이스회로에 있어서, 풀엎용 양전원 및 풀다운용 음전원과, 상기 터미날의 복수의 데이타 전송출력 라인들과 상기 모뎀의 대응입력 라인들간을 전기적으로 절연시키고 또한 그들사이에서 송신시 상기 출력 라인들의 신호출력에 응답하여 상기 입력라인들을 각각 소정 전압으로 풀엎시키도록 상기 양전원에 병렬로 접속되는 풀엎용 수단들로 되는 라인 드라이버(1)와, 비송신시 상기 입력라인들을 각각 소정전압으로 풀다운 시키도록 상기 음전원에 병렬로 접속되는 풀다운 수단들로 되는 레지스터 어레이(2)로 구성되는 것이 특징인 터미날의 멀티드롭 접속용 송신 인터페이스회로.A reception and transmission interface circuit for a multidrop connection of a terminal for connecting multiple terminals in parallel to a single modem in a computer system, comprising: a pull-up positive power supply and a pull-down negative power supply, and a plurality of data transmission output lines of the terminal; Pull-out means electrically connected between the corresponding input lines of the modem to electrically insulate the input lines to a predetermined voltage in response to the signal output of the output lines when transmitting therebetween, A multi-drop of the terminal, characterized in that it consists of a line driver (1) and a resistor array (2) consisting of pull-down means connected in parallel to the negative power source to pull down each of the input lines to a predetermined voltage during non-transmission. Transmission interface circuit for connection. 제1항에 있어서, 상기 풀엎용 수단은 포토커플러(4)로 구성되며, 상기 포토커플러의 발광소자(LED)는 상기 출력라인과 접지간에 순방향으로 접속되고, 그의 수광소자(PT)는 상기 풀엎용 양전원과 상기 입력라인간에 접속되는 것이 특징인 터미날의 멀티드롭접속용 송신 인터페이스회로.2. The device of claim 1, wherein the pull-out means comprises a photocoupler (4), the light emitting element (LED) of the photocoupler being connected in a forward direction between the output line and ground, and the light receiving element (PT) thereof is the pull A multi-drop connection transmission interface circuit for a terminal, characterized by being connected between an overload power supply and the input line. 제1항에 있어서, 상기 풀다운용 수단은 풀다운 저항(5)인 것인 특징인 터미날의 멀티드롭접속용 송신 인터페이스회로.The transmission interface circuit according to claim 1, wherein said pull-down means is a pull-down resistor (5). ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019920006090A 1992-04-13 1992-04-13 Interface circuit KR940006827B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019920006090A KR940006827B1 (en) 1992-04-13 1992-04-13 Interface circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019920006090A KR940006827B1 (en) 1992-04-13 1992-04-13 Interface circuit

Publications (2)

Publication Number Publication Date
KR930022212A true KR930022212A (en) 1993-11-23
KR940006827B1 KR940006827B1 (en) 1994-07-28

Family

ID=19331674

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019920006090A KR940006827B1 (en) 1992-04-13 1992-04-13 Interface circuit

Country Status (1)

Country Link
KR (1) KR940006827B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101503354B1 (en) * 2013-03-28 2015-03-19 주식회사 코맥스 Videophone with Interphone Function

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101503354B1 (en) * 2013-03-28 2015-03-19 주식회사 코맥스 Videophone with Interphone Function

Also Published As

Publication number Publication date
KR940006827B1 (en) 1994-07-28

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