JPS6447138A - Inter-terminal interface circuit - Google Patents

Inter-terminal interface circuit

Info

Publication number
JPS6447138A
JPS6447138A JP20354987A JP20354987A JPS6447138A JP S6447138 A JPS6447138 A JP S6447138A JP 20354987 A JP20354987 A JP 20354987A JP 20354987 A JP20354987 A JP 20354987A JP S6447138 A JPS6447138 A JP S6447138A
Authority
JP
Japan
Prior art keywords
terminal
photocoupler
control information
control
equipment
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
JP20354987A
Other languages
Japanese (ja)
Inventor
Masaru Yamamura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP20354987A priority Critical patent/JPS6447138A/en
Publication of JPS6447138A publication Critical patent/JPS6447138A/en
Pending legal-status Critical Current

Links

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  • Bidirectional Digital Transmission (AREA)

Abstract

PURPOSE:To simplify the system constitution by applying timing control to a control loop formed by 2-core cables between terminal equipments so as to use the control information for both the transmission and reception. CONSTITUTION:Terminal boards 1a, 1b of terminal equipments A, B are connected by a 2-core cable 2 to form a control loop for transmission/reception. In sending the control information from the terminal equipment A to the equipment B, after the unreceived control information from the terminal equipment B is confirmed by a photocoupler 4a and the terminal set A turns on a line current drive IC 3a. Thus, a loop current flowing from the power supply voltage Va is given to a photocoupler voltage generating resistor 5b via a photocoupler 4b and the voltage drop across the resistor 5b is detected by a detection IC 6b. Thus, a 2-core cable is enough for the terminal connection and the system is constituted simply with low cost.
JP20354987A 1987-08-18 1987-08-18 Inter-terminal interface circuit Pending JPS6447138A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20354987A JPS6447138A (en) 1987-08-18 1987-08-18 Inter-terminal interface circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20354987A JPS6447138A (en) 1987-08-18 1987-08-18 Inter-terminal interface circuit

Publications (1)

Publication Number Publication Date
JPS6447138A true JPS6447138A (en) 1989-02-21

Family

ID=16475978

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20354987A Pending JPS6447138A (en) 1987-08-18 1987-08-18 Inter-terminal interface circuit

Country Status (1)

Country Link
JP (1) JPS6447138A (en)

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