JPH0319009A - Serial interface circuit - Google Patents

Serial interface circuit

Info

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
Application number
JP15401889A
Other languages
Japanese (ja)
Inventor
Etsuyuki Sakurai
桜井 悦行
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.)
Seiko Epson Corp
Original Assignee
Seiko Epson Corp
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 Seiko Epson Corp filed Critical Seiko Epson Corp
Priority to JP15401889A priority Critical patent/JPH0319009A/en
Publication of JPH0319009A publication Critical patent/JPH0319009A/en
Pending legal-status Critical Current

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  • Optical Communication System (AREA)

Abstract

PURPOSE:To easily drive an optical fiber interface via an interface of an RS-232C where the arrangement of pins of a connector is decided by setting the transmission and reception circuits for optical fiber in parallel with each other and performing the switch the voltage signal and the optical fiber signal with use of a switch signal. CONSTITUTION:An optical fiber interface is prepared together with an RS-232C driver/receiver, and a switch circuit. That is, an RS driver IC 11 and an LED drive circuit 12 for optical fiber are used and a switch element 13 which drives a relay 14 for switch of a contact 15 that performs the switch between an optical fiber or an RS is controlled by a control signal 18. As a result, the connection is secured with an optical interface having high resistance to the noises via a serial interface exactly equal to the conventional one. Thus the optical fiber is used in an inferior noise environment or for the long distance transmission. Meanwhile a transmission cable applying the electric signal is usually available and effective to an information equipment which uses many peripheral devices via a general-purpose computer like a personal computer, etc.

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.

〔従来の技術〕[Conventional technology]

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.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

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.

〔課題を解決するための手段〕[Means to solve the problem]

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.

〔作用〕[Effect]

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.

〔実施例〕〔Example〕

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.

〔発明の効果〕〔Effect of the invention〕

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.

【図面の簡単な説明】[Brief explanation of drawings]

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)

【特許請求の範囲】[Claims] (1)電圧の変化を信号として伝えるシリアルインター
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.
(2)電圧切換え信号をシリアルコネクタのピンに接続
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.
JP15401889A 1989-06-16 1989-06-16 Serial interface circuit Pending JPH0319009A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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