JPH0356919U - - Google Patents
Info
- Publication number
- JPH0356919U JPH0356919U JP11804389U JP11804389U JPH0356919U JP H0356919 U JPH0356919 U JP H0356919U JP 11804389 U JP11804389 U JP 11804389U JP 11804389 U JP11804389 U JP 11804389U JP H0356919 U JPH0356919 U JP H0356919U
- Authority
- JP
- Japan
- Prior art keywords
- terminal
- relay switch
- line
- interface circuit
- communication interface
- 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
- 239000000872 buffer Substances 0.000 claims 3
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Stroboscope Apparatuses (AREA)
Description
第１図は本考案による通信インターフエース回
路の一実施例を示す回路図、第２図は一台のホス
トに複数の端末を直列に接続する通信システムの
概略図、第３図は第２図の端末で使用する通信イ
ンターフエース回路の一例を示す回路図である。
１０……端末用通信インターフエース回路、１
１……受信側、１２……送信側、１３……リレー
スイツチ、１３ａ，１３ｂ，１３ｃ，１３ｄ……
スイツチ部、１３ｅ……リレー部、１４，１５，
１６，１７……バツフア。
Fig. 1 is a circuit diagram showing an embodiment of a communication interface circuit according to the present invention, Fig. 2 is a schematic diagram of a communication system in which a plurality of terminals are connected in series to one host, and Fig. 3 is a schematic diagram showing an embodiment of a communication interface circuit according to the present invention. FIG. 2 is a circuit diagram showing an example of a communication interface circuit used in a terminal. 10...Communication interface circuit for terminal, 1
1... Receiving side, 12... Transmitting side, 13... Relay switch, 13a, 13b, 13c, 13d...
Switch part, 13e... Relay part, 14, 15,
16, 17...Batsuhua.
Claims (1)
接続されるような通信システムにて、ホスト側及
び終端の端末側に対してそれぞれバツフアを介し
て回線が接続されている端末用通信インターフエ
ース回路において、 各回線について、そのバツフアの外側にて上記
回線のホスト側と終端の端末側とを直結する第一
の端子と、該バツフアに接続される第二の端子と
に切換え接続され得るリレースイツチが挿入され
ていて、当該端末の電源オン時は、該リレースイ
ツチが第二の端子に接続されているが、当該端末
の電源オフにより該リレースイツチが作動して第
一の端子に切り換えられることを特徴とする、端
末用通信インターフエー回路。[Claim for Utility Model Registration] In a communication system in which multiple terminals are connected in series to one host, lines are connected to the host side and the terminal side through buffers respectively. In the communication interface circuit for connected terminals, for each line, there is a first terminal that directly connects the host side of the line and the terminal side of the line outside the buffer, and a second terminal that is connected to the buffer. A relay switch that can be switched and connected to the second terminal is inserted, and when the terminal is powered on, the relay switch is connected to the second terminal, but when the terminal is powered off, the relay switch is activated. A communication interface circuit for a terminal, characterized in that the terminal is switched to a first terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11804389U JPH0356919U (en) | 1989-10-07 | 1989-10-07 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11804389U JPH0356919U (en) | 1989-10-07 | 1989-10-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0356919U true JPH0356919U (en) | 1991-05-31 |
Family
ID=31666228
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11804389U Pending JPH0356919U (en) | 1989-10-07 | 1989-10-07 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0356919U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5392603A (en) * | 1977-01-25 | 1978-08-14 | Mitsubishi Electric Corp | Line branching unit |
| JPS5810896A (en) * | 1981-07-10 | 1983-01-21 | ソニー株式会社 | Printed board |
-
1989
- 1989-10-07 JP JP11804389U patent/JPH0356919U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5392603A (en) * | 1977-01-25 | 1978-08-14 | Mitsubishi Electric Corp | Line branching unit |
| JPS5810896A (en) * | 1981-07-10 | 1983-01-21 | ソニー株式会社 | Printed board |
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