JPS60172456U - interface circuit - Google Patents

interface circuit

Info

Publication number
JPS60172456U
JPS60172456U JP1984061252U JP6125284U JPS60172456U JP S60172456 U JPS60172456 U JP S60172456U JP 1984061252 U JP1984061252 U JP 1984061252U JP 6125284 U JP6125284 U JP 6125284U JP S60172456 U JPS60172456 U JP S60172456U
Authority
JP
Japan
Prior art keywords
relay
external connection
line
interface circuit
power supply
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
JP1984061252U
Other languages
Japanese (ja)
Inventor
平島　光裕
Original Assignee
日本電気株式会社
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 日本電気株式会社 filed Critical 日本電気株式会社
Priority to JP1984061252U priority Critical patent/JPS60172456U/en
Publication of JPS60172456U publication Critical patent/JPS60172456U/en
Pending legal-status Critical Current

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  • Maintenance And Management Of Digital Transmission (AREA)
  • Small-Scale Networks (AREA)

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本考案の一実施例のブロック図、第２図は第１
図に示した電源電圧検出回路の入力及び出力の電圧波形
図である。 １・・・ライントライバ、２・・・リレー、３・・・リ
レー制御回路、３ａ・・・電源電圧検出回路、３ｂ・−
・インバータ（オープンコレクタ型）、４・・・ライン
レシーバ、５・・・終端抵抗、１１・・・センドデータ
、１２・・・イネーブル信号、１３．１４・・・外部接
続用ライン、１５・・・出力信号。Fig. 1 is a block diagram of an embodiment of the present invention, and Fig. 2 is a block diagram of an embodiment of the present invention.
FIG. 3 is a diagram of input and output voltage waveforms of the power supply voltage detection circuit shown in the figure. DESCRIPTION OF SYMBOLS 1... Line driver, 2... Relay, 3... Relay control circuit, 3a... Power supply voltage detection circuit, 3b...-
・Inverter (open collector type), 4... Line receiver, 5... Termination resistor, 11... Send data, 12... Enable signal, 13.14... Line for external connection, 15...・Output signal.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 外部接続用出力に高インピーダンス状態を持つことがで
きるライントライバと、該ライントライバの出力端と外
部接続用ラインとの間に接続されるリレーと、該リレー
と電源との間に接続し前記電源の電圧を検出する電源電
圧検出回路とインバータとを有し前記リレーのオンオフ
を制御するリレー制御回路と、前記外部接続用ラインに
接続されたラインレシーバとを含むことを特徴とするイ
ンタフェース回路。A line driver whose output for external connection can have a high impedance state, a relay connected between the output end of the line driver and the external connection line, and a relay connected between the relay and a power source. An interface circuit characterized in that it includes a power supply voltage detection circuit that detects the voltage of the power supply and an inverter, a relay control circuit that controls on/off of the relay, and a line receiver connected to the external connection line. .
JP1984061252U 1984-04-25 1984-04-25 interface circuit Pending JPS60172456U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1984061252U JPS60172456U (en) 1984-04-25 1984-04-25 interface circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1984061252U JPS60172456U (en) 1984-04-25 1984-04-25 interface circuit

Publications (1)

Publication Number Publication Date
JPS60172456U true JPS60172456U (en) 1985-11-15

Family

ID=30589355

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1984061252U Pending JPS60172456U (en) 1984-04-25 1984-04-25 interface circuit

Country Status (1)

Country Link
JP (1) JPS60172456U (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55165040A (en) * 1979-06-11 1980-12-23 Nec Corp Power supply unit for driving circuit in common transmission line
JPS57111717A (en) * 1980-12-29 1982-07-12 Fujitsu Ltd Bus control system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55165040A (en) * 1979-06-11 1980-12-23 Nec Corp Power supply unit for driving circuit in common transmission line
JPS57111717A (en) * 1980-12-29 1982-07-12 Fujitsu Ltd Bus control system

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