JPS6447138A - Inter-terminal interface circuit - Google Patents
Inter-terminal interface circuitInfo
- 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
Links
Landscapes
- 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.
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) |
-
1987
- 1987-08-18 JP JP20354987A patent/JPS6447138A/en active Pending
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