JPS5792961A - Interface circuit - Google Patents

Interface circuit

Info

Publication number
JPS5792961A
JPS5792961A JP16750680A JP16750680A JPS5792961A JP S5792961 A JPS5792961 A JP S5792961A JP 16750680 A JP16750680 A JP 16750680A JP 16750680 A JP16750680 A JP 16750680A JP S5792961 A JPS5792961 A JP S5792961A
Authority
JP
Japan
Prior art keywords
trs
diodes
earth
lines
transmitted
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.)
Granted
Application number
JP16750680A
Other languages
Japanese (ja)
Other versions
JPS6325740B2 (en
Inventor
Osamu Uechi
Michinobu Ohata
Koji Mizushima
Katsuhiko Furukawa
Kouchi Ro
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.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP16750680A priority Critical patent/JPS5792961A/en
Publication of JPS5792961A publication Critical patent/JPS5792961A/en
Publication of JPS6325740B2 publication Critical patent/JPS6325740B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
    • H04Q3/52—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker using static devices in switching stages, e.g. electronic switching arrangements
    • H04Q3/521—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker using static devices in switching stages, e.g. electronic switching arrangements using semiconductors in the switching stages

Abstract

PURPOSE:To cope with a power break, by connecting the base of a transistor constituting an electronic relay to the earth through a diode at the power break time. CONSTITUTION:An electronic relay for SR signal transmission consists of transistors TRs Q1-Q24 and transmission terminals 71-724 connected to current sources I1-I24, and respective emitters of TRs Q1-Q24 are connected to lines CH1SR-CH24SR, and respective bases of TRs Q1-Q24 are grounded through diodes D1-D24 and a common switch 8. In the normal operation, signals of terminals 71-724 are transmitted to lines because diodes D1-D24 are biased backward by current sources I1-I24. Meanwhile, when the local power source becomes faulty, the switch 8 is closed, and the earth of diodes D1-D24 are applied to TRs Q1-Q24, and earth signals are transmitted to respective lines.
JP16750680A 1980-11-28 1980-11-28 Interface circuit Granted JPS5792961A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16750680A JPS5792961A (en) 1980-11-28 1980-11-28 Interface circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16750680A JPS5792961A (en) 1980-11-28 1980-11-28 Interface circuit

Publications (2)

Publication Number Publication Date
JPS5792961A true JPS5792961A (en) 1982-06-09
JPS6325740B2 JPS6325740B2 (en) 1988-05-26

Family

ID=15850939

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16750680A Granted JPS5792961A (en) 1980-11-28 1980-11-28 Interface circuit

Country Status (1)

Country Link
JP (1) JPS5792961A (en)

Also Published As

Publication number Publication date
JPS6325740B2 (en) 1988-05-26

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