JPH0319009A - Serial interface circuit - Google Patents
Serial interface circuitInfo
- Publication number
- JPH0319009A JPH0319009A JP15401889A JP15401889A JPH0319009A JP H0319009 A JPH0319009 A JP H0319009A JP 15401889 A JP15401889 A JP 15401889A JP 15401889 A JP15401889 A JP 15401889A JP H0319009 A JPH0319009 A JP H0319009A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- switch
- signal
- interface
- transmission
- 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
- 239000013307 optical fiber Substances 0.000 claims abstract description 24
- 230000005540 biological transmission Effects 0.000 abstract description 12
- 230000003287 optical effect Effects 0.000 abstract description 7
- 230000002093 peripheral effect Effects 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
Landscapes
- Optical Communication System (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、データ処理装置と周辺機器の接続構造（イン
ターフェース）に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a connection structure (interface) between a data processing device and peripheral equipment.
従来、光ファイバー用のインターフェースとＲ３−２３
２Ｃで定義されるシリアルインターフェースは、信号の
ピン配置が異るか各々別個の専用インターフェースであ
った。Conventionally, optical fiber interface and R3-23
The serial interfaces defined in 2C had different signal pin arrangements or were separate dedicated interfaces.
従来の方法ではＲ３−２３２０はインターフェースの標
準としてコネクタのピン配置、信号の極性、電圧変化幅
等細かく規定されている。しかし伝送可能距＾１目よ１
５ｍ位と短かく［１つ、電磁波を発生する等電気的に問
題が多い。他方、光ファイバー用インターフェースは電
気的に絶縁されるため安定で且つ長距＾「伝送が可１ｊ
ヒだが、標イ（ζ化されておらずコネクタピン配置に又
信号レベルに問題がある０本発明はこの両方の長所を併
せ持つインターフェースを供給する事にある。即ちコネ
クタのピン配置が決まったＲ３−２３２Ｃのインターフ
ェースから光ファイバーインターフェースを容易に駆動
できるインターフェース回路を供給する事が本発明の目
的である。In the conventional method, R3-2320 is used as an interface standard, and the connector pin arrangement, signal polarity, voltage change width, etc. are specified in detail. However, the possible transmission distance is 1
Although it is short at about 5 meters, there are many electrical problems such as the generation of electromagnetic waves. On the other hand, optical fiber interfaces are electrically insulated, making them stable and capable of long-distance transmission.
However, the present invention aims to provide an interface that combines the advantages of both of the above.In other words, the R3 connector pin layout is determined. It is an object of the present invention to provide an interface circuit that can easily drive a fiber optic interface from a -232C interface.
上記目的を達成するために、本発明は光ファイバー用イ
ンターフェースとＲ３−２３２Ｃ用のドライバー・レシ
ーバ−を有して且つ、この切換え回路を有する構造とす
る。In order to achieve the above object, the present invention has a structure including an optical fiber interface, a driver/receiver for R3-232C, and a switching circuit.
本発明の上記４１１１成によれば、従来と全く同一のシ
リアルインターフェースにてノイズに強い光インターフ
ェースによる接続が可１１ヒとなる。According to the above-mentioned configuration of the present invention, connection using a noise-resistant optical interface can be made using the same serial interface as the conventional one.
以下本発明の詳細をパーソナルコンピュータ（以降ＰＣ
と略す）とプリンタの接続を例にあげて説明するが本発
明はこれらの機器以外の接続に対しても適用可能である
。The details of the present invention will be explained below using a personal computer (hereinafter referred to as PC).
Although the present invention will be explained by taking as an example the connection between a printer and a printer, the present invention is also applicable to connections other than these devices.
第１図に本発明の概要を示す、１はパソコンで２はパソ
コンに接続されるプリンターである。この両者を接続し
データを伝達するためにケーブル３が必要である。ケー
ブル３を電気信号の伝達手段として考えるとシリアルイ
ンターフェースの標準ＲＳ −２３２Ｘ３！格で考える
と最大１５ｍ迄しか伸ばせないばかりか工場等のノイズ
環境の悪いところでは安定した動作が得にくい、これに
対しケーブルを光ファイバーとするとノイズ環境の悪い
ところでも使用可１ｊヒとなり１００ｍ位の伝送が可能
となるがコスト的に高価となるため両ケーブルの使い分
けが必要となるのである。そこで以下パソコン１又はプ
リンタ２に内蔵されるドライバー回路、レシーバ−回路
及びケーブル構造を説明する。An outline of the present invention is shown in FIG. 1, where 1 is a personal computer and 2 is a printer connected to the personal computer. A cable 3 is required to connect the two and transmit data. Considering cable 3 as a means of transmitting electrical signals, it is the standard serial interface RS-232X3! Considering the cable length, it can only be extended to a maximum of 15m, and it is difficult to obtain stable operation in places with bad noise environments such as factories.On the other hand, if the cable is made of optical fiber, it can be used even in places with bad noise environments. Although transmission is possible, it is expensive and requires the use of both cables. Therefore, the driver circuit, receiver circuit, and cable structure built into the personal computer 1 or printer 2 will be explained below.
第２図に本発明の出力回路を示す、１１はＲ３用のドラ
イバーＩＣを示す、又１２は光ファイバー用のＬＥＤの
駆動回路を示す、１３は光ファイバーかＲ８かを切り換
える接点１５を切り換えるリレー１４を駆動するスイッ
チ素子で制御信号１８により制御される。制御信号１８
がＨｉｇｈ又はオープンの時リレーの接点１５はａ側に
あるとする。この時Ｒ３の規格で規定されるコネクタの
出力は１１のＲ３のドライバーが接続され信号伝送は第
２図（ａ）に示す電圧伝送となる。−力制御信号がＬｏ
ｗの時リレーの接点１５はｂ側となり光ファイバーのド
ライバー回路１２がコネクタ７に接続されＲ３で定義さ
れたコネクタのケーブル側に内蔵されるＬＥＤを駆動す
る。これを第３図（ｂ）に示す、第３図（ａ）、 （ｂ
）とも、第２図の送信回路と第４図の受信回路の接続状
態を示す、第３図（ａ）は電圧伝送モードを示す、第２
図のスイッチ１５がａ側、第４図のスイッチ４５がａ側
に接続された状態である。この時ケーブル２１は線によ
る接続のみであり、第５図（ａ）の３１となる。第３図
（ｂ）は光ファイバーによるデータ伝送の状態を示す、
２５は第２図の１７の出力端子までの回路を示す、２２
は電流を光に変換するＬＥＤであり、２３は光信号を伝
送する光ファイバーケーブルである。２２により電流変
化を光信号に変化させ、光ファイバーケーブル２３を経
由して光変化を電圧に変換する充電変換素子２４を通し
て受信回路２６に伝えられる。第３図２２は第５図（ｃ
）に示す３３の如く配され、光電変換索子２４は３４の
り１１＜配され光ファイバーケーブルと組み合され全体
として第５図（ｂ）の３２となる。受信回路は第４図に
示される。４８はＲ３−２３２か光ファイバーかをｂ）
Ｊり換える信号で第２図の信号１８と同一極性である。FIG. 2 shows the output circuit of the present invention. 11 shows the driver IC for R3, 12 shows the drive circuit for the LED for optical fiber, and 13 shows the relay 14 that switches the contact 15 that switches between the optical fiber and R8. It is a switching element to be driven and is controlled by a control signal 18. control signal 18
It is assumed that the relay contact 15 is on the a side when is High or open. At this time, eleven R3 drivers are connected to the output of the connector specified by the R3 standard, and the signal transmission becomes voltage transmission as shown in FIG. 2(a). -Force control signal is Lo
At the time of w, the relay contact 15 becomes the b side, and the optical fiber driver circuit 12 is connected to the connector 7 and drives the LED built in the cable side of the connector defined by R3. This is shown in Figure 3(b), Figure 3(a), (b)
) both show the connection state of the transmitting circuit in FIG. 2 and the receiving circuit in FIG. 4, FIG. 3(a) shows the voltage transmission mode, and FIG.
The switch 15 in the figure is connected to the a side, and the switch 45 in FIG. 4 is connected to the a side. At this time, the cable 21 is connected only by a wire, and becomes 31 in FIG. 5(a). FIG. 3(b) shows the state of data transmission by optical fiber.
25 shows the circuit up to the output terminal 17 in FIG. 2, 22
23 is an LED that converts current into light, and 23 is an optical fiber cable that transmits an optical signal. 22 converts the current change into an optical signal, which is transmitted to the receiving circuit 26 via the optical fiber cable 23 through the charging conversion element 24 that converts the optical change into voltage. Figure 3 22 is shown in Figure 5 (c
), and the photoelectric conversion cables 24 are arranged as 33 shown in FIG. The receiving circuit is shown in FIG. 48 is R3-232 or optical fiber b)
This is a signal that switches between J and has the same polarity as signal 18 in FIG.
トランジスタ４３は信号４８によりリレー４４を駆動す
るスイッチ素子であるｅ （ｇ号４８がＨｉｇｈ又は
オーブンの時リレーの接点４５はａ側にあり、この時Ｒ
３用のレシーバ−４１が接続され出力信号４７に出力さ
れる。又信号４８がＬｏｗの時リレーの接点４５はｂ側
となり光ファイバーのレシーバ−回路４２が選択される
０回路４１及び４２とも出力はワイヤＯＲが可能である
。このためリレー接点４５のａを選択した時のｂ側、ｂ
を選択した時のａ側はともに出力がＨｉｇｈとなる様設
定される。又は出力信号４７をリレー４４の動作に応じ
て切り換える事も可能である。The transistor 43 is a switching element that drives the relay 44 by the signal 48. (When the g 48 is High or oven, the relay contact 45 is on the a side, and at this time R
A receiver 41 for 3 is connected and an output signal 47 is output. When the signal 48 is Low, the relay contact 45 is on the b side, and the optical fiber receiver circuit 42 is selected.The outputs of the 0 circuits 41 and 42 can be wire-ORed. Therefore, when the a of the relay contact 45 is selected, the b side, b
When is selected, both outputs on the a side are set to be High. Alternatively, it is also possible to switch the output signal 47 according to the operation of the relay 44.
以上述べてきた回路及びケーブルを使用すると制御信号
を本体内でスイッチ等の手段で切り換えるか１８号ケー
ブルに於いて特別なピンに制御信号を出力し電圧伝送用
のケーブルと光ファイバーを自動識別し、工場等のノイ
ズが多い時簡単に光）アイバーケーブルが使用できる。When using the circuit and cable described above, the control signal can be switched within the main unit using a switch or other means, or the control signal can be output to a special pin on the No. 18 cable to automatically identify the voltage transmission cable and the optical fiber. When there is a lot of noise, such as in a factory, you can easily use the optical fiber cable.
又ノイズに特に大きな問題のない場合コストの安い電圧
伝送用ケーブルを使用する事ができる。Also, if there is no particular problem with noise, an inexpensive voltage transmission cable can be used.
以上述べた本発明を利用すればノイズ環境の悪い所で又
は長距離伝送を行う時は光ファイバーケーブルを使用し
、通常は電気信号による伝送ケーブルを使用する事が容
易に実現でき、パソコン等汎用のコンピュータで周辺機
器を多数使用する情報機器に大変有効である。By using the present invention described above, it is possible to easily use an optical fiber cable in a place with a bad noise environment or when performing long-distance transmission, and to use an electric signal transmission cable in general. It is very effective for information equipment that uses many peripheral devices for computers.
第１図はパソコンとプリンタの接続状態を示す図、第２
図は出力回路を示す図、第３図（ａ）は電気信号による
接続状態を示す図、第３図（ｂ）は光信号による接続状
態を電気的に示す図、第４図は受信回路を示す図、第５
図（ａ）は電気信号を伝えるケーブルを示す図、第５図
（ｂ）は光信号を伝える外観を示す図、第５図（Ｃ）は
第５図（ｂ）のコネクタ部の内部構造を示す図。
１・・・パソコン
２・・・プリンタ
３・・・ケーブル
以 上Figure 1 shows the connection status between the computer and printer, Figure 2
The figure shows the output circuit, Figure 3(a) shows the connection state using electrical signals, Figure 3(b) shows the electrical connection state using optical signals, and Figure 4 shows the receiving circuit. Figure 5
Figure (a) shows the cable that transmits electrical signals, Figure 5 (b) shows the external appearance of the cable that transmits optical signals, and Figure 5 (C) shows the internal structure of the connector part in Figure 5 (b). Figure shown. 1...PC 2...Printer 3...Cable or more
Claims (2)
フェースに於いて、光ファイバー用の送受信回路を並設
し、切換え信号で、電圧信号か光ファイバーかの信号を
切り換える事を特徴としたシリアルインターフェース回
路。(1) A serial interface circuit that transmits changes in voltage as a signal, in which transmitting and receiving circuits for optical fibers are arranged in parallel, and a switching signal is used to switch between the voltage signal and the optical fiber signal.
し外部より切換えを可能とした事を特徴とする請求項１
記載のシリアルインターフェース回路。(2) Claim 1 characterized in that the voltage switching signal is connected to a pin of a serial connector to enable switching from the outside.
Serial interface circuit as described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15401889A JPH0319009A (en) | 1989-06-16 | 1989-06-16 | Serial interface circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15401889A JPH0319009A (en) | 1989-06-16 | 1989-06-16 | Serial interface circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0319009A true JPH0319009A (en) | 1991-01-28 |
Family
ID=15575110
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15401889A Pending JPH0319009A (en) | 1989-06-16 | 1989-06-16 | Serial interface circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0319009A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05143209A (en) * | 1991-06-10 | 1993-06-11 | Internatl Business Mach Corp <Ibm> | Retractable optical-fiber connector for computer |
| JPH07168655A (en) * | 1993-09-08 | 1995-07-04 | Samsung Electron Co Ltd | Changeover control device of serial communication port and optical communication port and its driving method |
-
1989
- 1989-06-16 JP JP15401889A patent/JPH0319009A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05143209A (en) * | 1991-06-10 | 1993-06-11 | Internatl Business Mach Corp <Ibm> | Retractable optical-fiber connector for computer |
| JPH07168655A (en) * | 1993-09-08 | 1995-07-04 | Samsung Electron Co Ltd | Changeover control device of serial communication port and optical communication port and its driving method |
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