JPS5883852U - interface circuit - Google Patents
interface circuitInfo
- Publication number
- JPS5883852U JPS5883852U JP1981178301U JP17830181U JPS5883852U JP S5883852 U JPS5883852 U JP S5883852U JP 1981178301 U JP1981178301 U JP 1981178301U JP 17830181 U JP17830181 U JP 17830181U JP S5883852 U JPS5883852 U JP S5883852U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- interface circuit
- output
- memory
- detection circuit
- 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
- Dc Digital Transmission (AREA)
- Monitoring And Testing Of Transmission In General (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
第１図は従来例のブロック図、第２図、第３図、第４図
及び第５図は本考案の第１、第２、第３及び第４の実施
例の各々のブロック図である。
１．５３・・・・・・ライントライバ、２．２１〜２ｎ
。
２Ｐ・・・・・・信号ケーブル、５．６． １３． １
４゜５５．５６・・・・・・フォトカプラ、１２・・・
・・・ラインレシーバ、５１．５９・・・・・・デコー
ダ、５２．６０・・・・・・マルチプレクサ。
簿ｑ目
１ ！
雪
■
１ 〜
１１
：１
１
−
答す図FIG. 1 is a block diagram of the conventional example, and FIGS. 2, 3, 4, and 5 are block diagrams of each of the first, second, third, and fourth embodiments of the present invention. . 1.53...Line driver, 2.21~2n
. 2P...Signal cable, 5.6. 13. 1
4゜55.56...Photocoupler, 12...
... line receiver, 51.59 ... decoder, 52.60 ... multiplexer. Book qth 1! Snow ■ 1 to 11: 1 1 - Answer diagram
Claims (2)
伝送するインターフェイス回路において、前記信号ケー
ブルに流れるループ電流が流れなくなったことを検出し
て出力を生じる検出回路と、この検出回路の出力を記憶
する記憶回路と、この記憶回路が前記の記憶を行なった
ときに動作する警報装置とを備えるようにしたことを特
徴とするインターフェイス回路。(1) In an interface circuit that transmits a signal from a transmitting side to a receiving side via a signal cable, there is a detection circuit that detects that the loop current flowing through the signal cable has stopped flowing and generates an output, and an output of this detection circuit. 1. An interface circuit comprising: a memory circuit for storing the above information; and an alarm device that operates when the memory circuit performs the above memory operation.
を備え、前記記憶回路が前記検出回路の出力を記憶した
ときにこの予備のインターフェイス回路に自動的に切り
換えられるようにしたことを特徴とする実用新案登録請
求の範囲第１項記載のインターフェイス回路。(2) A practical use characterized in that a spare interface circuit and a switching circuit are separately provided, so that when the storage circuit stores the output of the detection circuit, it is automatically switched to the spare interface circuit. An interface circuit according to claim 1 of patent registration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1981178301U JPS5883852U (en) | 1981-11-30 | 1981-11-30 | interface circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1981178301U JPS5883852U (en) | 1981-11-30 | 1981-11-30 | interface circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5883852U true JPS5883852U (en) | 1983-06-07 |
Family
ID=29972968
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1981178301U Pending JPS5883852U (en) | 1981-11-30 | 1981-11-30 | interface circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5883852U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63100829A (en) * | 1986-10-17 | 1988-05-02 | Rikuruuto:Kk | Digital line termination unit supervisory equipment |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4925781U (en) * | 1972-06-07 | 1974-03-05 |
-
1981
- 1981-11-30 JP JP1981178301U patent/JPS5883852U/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4925781U (en) * | 1972-06-07 | 1974-03-05 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63100829A (en) * | 1986-10-17 | 1988-05-02 | Rikuruuto:Kk | Digital line termination unit supervisory equipment |
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