JPS6376653A - Automatic switching system for terminal of partially matched terminal transmission line - Google Patents

Automatic switching system for terminal of partially matched terminal transmission line

Info

Publication number
JPS6376653A
JPS6376653A JP61222368A JP22236886A JPS6376653A JP S6376653 A JPS6376653 A JP S6376653A JP 61222368 A JP61222368 A JP 61222368A JP 22236886 A JP22236886 A JP 22236886A JP S6376653 A JPS6376653 A JP S6376653A
Authority
JP
Japan
Prior art keywords
transmission
termination
circuit
terminal
signal
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.)
Granted
Application number
JP61222368A
Other languages
Japanese (ja)
Other versions
JPH0370423B2 (en
Inventor
Masahiko Yamaguchi
昌彦 山口
Shinichi Samezawa
信一 鮫澤
Hiroyuki Ono
博之 小野
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.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP61222368A priority Critical patent/JPS6376653A/en
Publication of JPS6376653A publication Critical patent/JPS6376653A/en
Publication of JPH0370423B2 publication Critical patent/JPH0370423B2/ja
Granted legal-status Critical Current

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  • Communication Control (AREA)

Abstract

PURPOSE:To prevent errors in a reception signal and the damage of a reception circuit by selecting the reception circuit for a partially matched terminal transmission line with a connected terminal that an opposite equipment requires with the aid of a terminal selection signal that the opposite equipment transmits if switching a terminal is needed in response to the connected opposite equipment. CONSTITUTION:With the aid of the terminal selection signal that a printer transmits through a line 18, a terminal switching means 16 selects the output of the reception circuit 5 receiving the reception signal of a transmission line 1, while a transmission switching means 17 transmits a disable signal to a transmission circuit 14 and an enable signal to a transmission circuit 15. The transmission circuit 14 is so constituted that it attains a high impedance to stop its transmission, while the transmission circuit 15 is so constituted that it transmits a transmission signal from a controller to a transmission line 2. Thus, the transmission line 1 is matched by a terminal 7 with an appropriate impedance that the printer requires, and therefore it can correctly transmits the reception signal. Similarly, when the transmission line 2 transmits the reception signal, it is matched by a terminal 8 with an appropriate impedance, thereby transmitting the reception signal correctly.

Description

【発明の詳細な説明】 〔概要〕 受信端に終端を接続することで整合する片整合終端伝送
路を複数用いて通信する装置において、接続する相手装
置に対応して該終端を切替える必要がある場合、相手装
置が送出する終端選択信号により、自動的に相手装置が
要求する終端が接続された片整合終端伝送路の受信回路
を選択することで、受信信号の誤り発生や、送受信回路
の破損等を防止する。
[Detailed Description of the Invention] [Summary] In a device that communicates using a plurality of single-matched termination transmission lines that match by connecting a termination to a receiving end, it is necessary to switch the termination in accordance with the connected partner device. In this case, a termination selection signal sent by the other device automatically selects the reception circuit of the single-matched termination transmission line to which the termination requested by the other device is connected, thereby preventing errors in the received signal or damage to the transmission/reception circuit. etc. will be prevented.

〔産業上の利用分野〕[Industrial application field]

本発明は受信端に終端を接続して伝送路の整合を行う片
整合終端伝送路に係り、特に接続する相手装置に応じて
受信回路の終端を切替える必要がある場合、相手装置か
ら入力する終端選択信号により自動的に終゛端を切替え
る片整合終端伝送路の終端自動切替方式に関する。
The present invention relates to a single-matched termination transmission line that connects a termination to a receiving end to match the transmission line, and in particular, when it is necessary to switch the termination of a receiving circuit depending on the connected device, the termination that is input from the destination device The present invention relates to an automatic termination switching system for a single-matched termination transmission line that automatically switches terminations according to a selection signal.

受信端に終端を持つことで、整合伝送を行う片整合伝送
路は、制御装置に対し端末装置、例えばプリンタを接続
するような場合に、信号の伝送路として使用され、プリ
ンタの送信信号を受信する制御装置の受信回路には、プ
リンタのインタフェース規格に基づき、適正なインピー
ダンスを持つ終端が接続される。
A matched transmission line that performs matched transmission by having a termination at the receiving end is used as a signal transmission line when connecting a terminal device, such as a printer, to a control device, and is used as a signal transmission line to receive signals sent by the printer. A termination having an appropriate impedance is connected to the receiving circuit of the control device that controls the printer, based on the printer interface standard.

この伝送路に機能の異なるプリンタを接続して使用する
場合、例えば低速のドツトプリンタや高速のレーザプリ
ンタ等を接続替えして使用する場合、ドツトプリンタと
レーザプリンタではインタフェース規格が異なるため、
制御装置の受信回路に接続される終端が異なる。
When connecting printers with different functions to this transmission path, for example, when connecting and using a low-speed dot printer and a high-speed laser printer, dot printers and laser printers have different interface standards.
The terminals connected to the receiving circuit of the control device are different.

このように、一つの片整合終端伝送路を用いて、インタ
フェース規格の異なるプリンタを接続替えした時は、制
御装置の受信回路の終端を誤り無く切替えることが必要
である。
In this way, when connecting printers with different interface standards using one matching termination transmission line, it is necessary to switch the termination of the receiving circuit of the control device without error.

〔従来の技術〕 第3図は従来の片整合終端伝送路の一例を説明する図で
ある。
[Prior Art] FIG. 3 is a diagram illustrating an example of a conventional single-matched termination transmission line.

伝送路1は例えば制御装置3の受信側と、プリンタ4の
送信側を接続し、伝送路2は制御装置3の送信側と、プ
リンタ4の受信側を接続しており、この伝送路1にはス
イッチ11を経て終端7と受信回路5が接続されている
。そして、受信回路5の出力はOR回路13を経て制御
装置3の受信信号として送出される。
For example, the transmission line 1 connects the receiving side of the control device 3 and the sending side of the printer 4, and the transmission line 2 connects the sending side of the control device 3 and the receiving side of the printer 4. The terminal 7 and the receiving circuit 5 are connected via the switch 11. Then, the output of the receiving circuit 5 is transmitted through the OR circuit 13 as a received signal to the control device 3.

終端7はプリンタ4のインタフェース規格に従って定ま
るインピーダンスを持つ。
The terminal end 7 has an impedance determined according to the interface standard of the printer 4.

制御装置3がプリンタ4に送出する送信信号は送信回路
9と10に入力し、スイッチ12が接続する送信回路9
の出力が伝送路2に送出され、プリンタ4の受信回路に
送出される。
The transmission signal that the control device 3 sends to the printer 4 is input to the transmission circuits 9 and 10, and the transmission circuit 9 is connected to the switch 12.
The output is sent to the transmission path 2 and then to the receiving circuit of the printer 4.

プリンタ4が機能の異なるプリンタと交換されり場合、
インタフェース規格が異なることが多く、伝送路1の終
端を変更する必要が生ずる。この時人手によりスイッチ
11と12が切替えられ、伝送路lにはスイッチ12を
経て終端8と受信回路6が接続され、伝送路2にはスイ
ッチ12を経て送信回路10が接続される。
If printer 4 is replaced with a printer with different functionality,
Since the interface standards often differ, it becomes necessary to change the termination of the transmission line 1. At this time, the switches 11 and 12 are manually switched, and the terminal 8 and the receiving circuit 6 are connected to the transmission path 1 through the switch 12, and the transmission circuit 10 is connected to the transmission path 2 through the switch 12.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

従来は上記の如く、終端を変更する必要がある相手装置
と接続した場合、人手によりスイッチを切替える必要が
ある。この時接続される相手装置のインタフェース規格
に合致した終端が接続されるように、スイッチを切替え
ねばならないが、このスイッチの設定を誤ると、伝送路
の整合がとれず、受信信号が誤ったり、送受信回路の破
損等が発生するという問題がある。
Conventionally, as described above, when connecting with a partner device that requires changing the termination, it is necessary to manually change the switch. At this time, the switch must be changed so that the terminal that matches the interface standard of the connected device is connected, but if this switch is set incorrectly, the transmission path may not be matched, and the received signal may be incorrect. There is a problem in that the transmitting/receiving circuit may be damaged.

〔問題点を解決するための手段〕[Means for solving problems]

第1図は本発明の原理ブロック図である。 FIG. 1 is a block diagram of the principle of the present invention.

第1図は制御装置の構成を示し、伝送路1には送信回路
14と終端7及び受信回路5が接続され、伝送路2には
送信回路15と終端8及び受信回路6が接続される。又
、プリンタの如き端末装置から終端選択信号を送出する
回線18が設けられ、送信切替手段17と終端切替手段
16に入る。
FIG. 1 shows the configuration of a control device, in which a transmission circuit 14, a termination 7, and a reception circuit 5 are connected to a transmission path 1, and a transmission circuit 15, a termination 8, and a reception circuit 6 are connected to a transmission path 2. Further, a line 18 is provided for sending a termination selection signal from a terminal device such as a printer, and enters the transmission switching means 17 and the termination switching means 16.

送信切替手段17は回線18から入る終端選択信号によ
り、送信回路14又は15の選択を行うイネーブルとデ
ィセーブル信号を作成し、送信回路14及び15に夫々
送出する。送信回路14゜15は送信切替手段17の送
出するイネーブル信号により送信信号を送出し、ディセ
ーブル信号により、出力インピーダンスを終端7又は8
のインピーダンスに対し、影響しない程度に高くして送
信信号送出を停止する。
The transmission switching means 17 generates enable and disable signals for selecting the transmission circuit 14 or 15 based on the termination selection signal input from the line 18, and sends them to the transmission circuits 14 and 15, respectively. The transmitting circuits 14 and 15 send out a transmit signal by the enable signal sent by the transmission switching means 17, and change the output impedance to the terminal 7 or 8 by the disable signal.
The transmission signal is stopped by increasing the impedance to a level that does not affect the impedance of the transmitter.

終端切替手段16は回線18から入る終端選択信号に基
づき、受信回路5及び6が送出する受信信号を選択する
Termination switching means 16 selects the reception signals sent by reception circuits 5 and 6 based on a termination selection signal input from line 18.

プリンタが回線18を経て送出した終端選択信号により
、終端切替手段16はプリンタのインタフェース規格に
合致した例えば終@7が接続された伝送路1の受信信号
を受信した受信回路5の出力を選択し、送信切替手段1
7は送信回路14にディセーブル信号を送信回路15に
イネーブル信号を送出する。
In response to the termination selection signal sent by the printer via the line 18, the termination switching means 16 selects the output of the receiving circuit 5 that has received the reception signal of the transmission line 1 to which termination @7 is connected, which conforms to the printer interface standard. , transmission switching means 1
7 sends a disable signal to the transmitting circuit 14 and an enable signal to the transmitting circuit 15.

従って、送信回路1゛4は高インピーダンスとなって送
信を停止し、送信回路15は伝送路2に制御装置の送信
信号を送出する構成とする。
Therefore, the transmitting circuits 1 and 4 become high impedance and stop transmitting, and the transmitting circuit 15 is configured to send out a transmission signal from the control device to the transmission path 2.

〔作用〕[Effect]

上記構成とすることにより、伝送路1はプリンタが必要
とする適正なインピーダンスを持つ終端7で整合される
ため、正しく受信信号を伝送することが出来る。又、同
様に伝送路2が受信信号を伝送する場合、適正なインピ
ーダンスを持つ終端8で整合され、正しく受信信号を伝
送することが出来る。
With the above configuration, the transmission line 1 is matched at the terminal end 7 having an appropriate impedance required by the printer, so that the received signal can be transmitted correctly. Similarly, when the transmission line 2 transmits a received signal, matching is performed at the terminal end 8 having an appropriate impedance, so that the received signal can be transmitted correctly.

〔実施例〕〔Example〕

第2図は本発明の一実施例を示す回路のブロック図であ
る。
FIG. 2 is a block diagram of a circuit showing one embodiment of the present invention.

制御装置3の伝送路1が接続される端子には送信回路1
4と終端7及び受信回路5が接続され、伝送路2が接続
される端子には送信回路15と終端8及び受信回路6が
接続される。
The transmission circuit 1 is connected to the terminal to which the transmission path 1 of the control device 3 is connected.
4, the terminal 7, and the receiving circuit 5 are connected, and the terminal to which the transmission line 2 is connected is connected to the transmitting circuit 15, the terminal 8, and the receiving circuit 6.

プリンタ4が例えば低速のドツトプリンタであり、イン
タフェース規格が終端7を指定しているとすると、プリ
ンタ4から回線18には“1″が送出され、伝送路1に
は送信回路21が、伝送路2には受信回路22が接続さ
れる。
If the printer 4 is, for example, a low-speed dot printer, and the interface standard specifies termination 7, then "1" is sent from the printer 4 to the line 18, the transmission circuit 21 is connected to the transmission path 1, and the transmission circuit 21 is connected to the transmission path 2. A receiving circuit 22 is connected to.

マルチプレクサ19は回線18から1″が入力するため
、受信回路5の出力を受信信号として送出し、受信回路
6の出力は送出しない。送信回路15の出力回路は例え
ばトライステートで構成され、1”が入力するため、イ
ネーブルとなって送信信号を伝送路2に送出する。
Since the multiplexer 19 receives 1'' from the line 18, it sends out the output of the receiving circuit 5 as a received signal, but does not send out the output of the receiving circuit 6.The output circuit of the transmitting circuit 15 is configured with a tri-state, for example, and the 1'' is inputted from the line 18. is input, it becomes enabled and sends out the transmission signal to the transmission line 2.

送信切替手段17のNOT回路20は回線18から“1
″が入力するため“0”を送信回路14に送出する。送
信回路14のトライステートは“0″が入力することで
ディセーブルとなり、出力インピーダンスを高くすると
共に送信動作を停止する。
The NOT circuit 20 of the transmission switching means 17 selects "1" from the line 18.
" is input, so "0" is sent to the transmitting circuit 14. The tri-state of the transmitting circuit 14 is disabled by inputting "0", and the output impedance is increased and the transmitting operation is stopped.

従って、伝送路1は終端7のインピーダンスで整合され
るため、プリンタ4の送信回路21の送出する信号は正
常に伝送される。
Therefore, since the transmission line 1 is matched by the impedance of the terminal end 7, the signal sent from the transmission circuit 21 of the printer 4 is transmitted normally.

プリンタ4が例えば高速のレーザプリンタであり、イン
タフェース規格が終端8を指定しているとすると、プリ
ンタ4から回線18には0″が送出され、伝送路1には
受信回路24が、伝送路2には送信回路23が接続され
る。
If the printer 4 is, for example, a high-speed laser printer, and the interface standard specifies termination 8, then 0'' is sent from the printer 4 to the line 18, the receiving circuit 24 is connected to the transmission path 1, and the receiving circuit 24 is connected to the transmission path 2. A transmitting circuit 23 is connected to.

マルチプレクサ19は回線18から“0″が入力するた
め、受信回路6の出力を受信信号として送出し、受信回
路5の出力は送出しない。送信回路15は“θ″が入力
するため、出力回路のトライステートがディセーブルと
なって出力インピーダンスを高くすると共に送信動作を
停止する。
Since the multiplexer 19 receives "0" from the line 18, it sends out the output of the receiving circuit 6 as a received signal, but does not send out the output of the receiving circuit 5. Since "θ" is input to the transmitting circuit 15, the tri-state of the output circuit is disabled, increasing the output impedance and stopping the transmitting operation.

送信切替手段17のNOT回路20は回線18から“0
”が入力するため“l”を送信回路14に送出する。送
信回路14のトライステートは、“1″が入力すること
でイネーブルとなって送信信号を伝送路2に送出する。
The NOT circuit 20 of the transmission switching means 17 outputs “0” from the line 18.
" is input, so "l" is sent to the transmission circuit 14. The tri-state of the transmission circuit 14 is enabled when "1" is input, and a transmission signal is sent to the transmission path 2.

従って、伝送路2は終端8のインピーダンスで整合され
るため、プリンタ4の送信回路23の送出する信号は正
常に伝送される。
Therefore, since the transmission line 2 is matched with the impedance of the terminal end 8, the signal sent from the transmission circuit 23 of the printer 4 is transmitted normally.

〔発明の効果〕〔Effect of the invention〕

以上説明した如(、本発明は片整合終端伝送において、
接続する相手装置に対応して、自動的に伝送系の特性を
乱さずに終端を切替えることが出来るため、人手による
終端の切替えが不要で、切替えミスによる誤動作や送受
信回路の破損を防止出来る。
As explained above (the present invention is applied to single-matched termination transmission,
Since the termination can be automatically switched according to the connected device without disturbing the characteristics of the transmission system, there is no need to manually switch the termination, and it is possible to prevent malfunctions and damage to the transmitting/receiving circuit due to switching errors.

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

第1図は本発明の原理ブロック図、 第2図は本発明の一実施例を示す回路のブロック図、 第3図は従来の片整合終端伝送路の一例を説明する図で
ある。 図において、 1.2は伝送路、   3は制御装置、4はプリンタ、
   5,6は受信回路、7.8は終端、    9,
10,14.15は送信回路、11.12はスイッチ、
 13はOR回路、16は終端切替手段、 17は送信
切替手段、18は回線、      19はマルチプレ
クサ、20はNOT回路である。
FIG. 1 is a block diagram of the principle of the present invention, FIG. 2 is a block diagram of a circuit showing an embodiment of the present invention, and FIG. 3 is a diagram illustrating an example of a conventional single-match termination transmission line. In the figure, 1.2 is a transmission line, 3 is a control device, 4 is a printer,
5 and 6 are receiving circuits, 7.8 is the terminal, 9,
10, 14.15 are transmitting circuits, 11.12 are switches,
13 is an OR circuit, 16 is a termination switching means, 17 is a transmission switching means, 18 is a line, 19 is a multiplexer, and 20 is a NOT circuit.

Claims (1)

【特許請求の範囲】 受信端に送信回路(14)と終端(7)及び受信回路(
5)を接続し、該終端(7)により伝送路の整合を行う
片整合終端伝送路(1)を複数用いて相手装置と通信す
る装置において、 該片整合終端伝送路(1)(2)の送信端に接続される
相手装置のインタフェース規格に応じて送出される終端
選択信号に基づき送信回路(14)(15)の切替えを
行う信号を送出する送信切替手段(17)と、該終端選
択信号に基づき受信回路(5)(6)の出力を切替える
終端切替手段(16)とを設け、 該送信切替手段(17)が送出する切替信号により、前
記送信回路(14)の出力インピーダンスを前記終端(
7)のインピーダンスに対し、影響しない程度に高くさ
せると共に、送信動作を停止させ、該終端切替手段(1
6)により送信を停止した送信回路(14)が接続され
た片整合終端伝送路(1)に接続された受信回路(5)
の出力を受信信号として送出させることを特徴とする片
整合終端伝送路の終端自動切替方式。
[Claims] The receiving end includes a transmitting circuit (14), a termination (7) and a receiving circuit (
In a device that communicates with a partner device using a plurality of single-matching termination transmission lines (1) that connect the single-matching termination transmission lines (1) and matching the transmission lines using the termination (7), the single-matching termination transmission lines (1) and (2) a transmission switching means (17) that sends out a signal for switching the transmission circuits (14) and (15) based on a termination selection signal sent out in accordance with the interface standard of the partner device connected to the transmission end of the transmission end; Termination switching means (16) for switching the outputs of the receiving circuits (5) and (6) based on the signal is provided, and the output impedance of the transmitting circuit (14) is changed to the above by the switching signal sent by the transmitting switching means (17). Termination (
The impedance of the termination switching means (1) is increased to such an extent that it does not affect the impedance of the termination switching means (1), and the transmission operation is stopped.
A receiving circuit (5) connected to a single matched termination transmission line (1) to which a transmitting circuit (14) whose transmission has been stopped due to 6) is connected.
An automatic termination switching system for a single-matched termination transmission line, characterized in that the output of the signal is transmitted as a received signal.
JP61222368A 1986-09-19 1986-09-19 Automatic switching system for terminal of partially matched terminal transmission line Granted JPS6376653A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61222368A JPS6376653A (en) 1986-09-19 1986-09-19 Automatic switching system for terminal of partially matched terminal transmission line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61222368A JPS6376653A (en) 1986-09-19 1986-09-19 Automatic switching system for terminal of partially matched terminal transmission line

Publications (2)

Publication Number Publication Date
JPS6376653A true JPS6376653A (en) 1988-04-06
JPH0370423B2 JPH0370423B2 (en) 1991-11-07

Family

ID=16781253

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61222368A Granted JPS6376653A (en) 1986-09-19 1986-09-19 Automatic switching system for terminal of partially matched terminal transmission line

Country Status (1)

Country Link
JP (1) JPS6376653A (en)

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JP2007153427A (en) * 2005-12-07 2007-06-21 Dainippon Printing Co Ltd Spout
JP2008143534A (en) * 2006-12-07 2008-06-26 Hosokawa Yoko Co Ltd Straw and container with straw
US9637300B2 (en) 2010-11-23 2017-05-02 Entegris, Inc. Liner-based dispenser

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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JPH11232937A (en) * 1998-02-17 1999-08-27 Sony Corp Connecting cable between devices by different interface standard kinds
JP4547722B2 (en) * 1998-02-17 2010-09-22 ソニー株式会社 Connection cables between devices according to different interface standards
JP2007153427A (en) * 2005-12-07 2007-06-21 Dainippon Printing Co Ltd Spout
JP2008143534A (en) * 2006-12-07 2008-06-26 Hosokawa Yoko Co Ltd Straw and container with straw
US9637300B2 (en) 2010-11-23 2017-05-02 Entegris, Inc. Liner-based dispenser

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