JPH03272217A - Signal changeover device - Google Patents

Signal changeover device

Info

Publication number
JPH03272217A
JPH03272217A JP7279390A JP7279390A JPH03272217A JP H03272217 A JPH03272217 A JP H03272217A JP 7279390 A JP7279390 A JP 7279390A JP 7279390 A JP7279390 A JP 7279390A JP H03272217 A JPH03272217 A JP H03272217A
Authority
JP
Japan
Prior art keywords
signal
input
nand gate
terminal
output
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
JP7279390A
Other languages
Japanese (ja)
Inventor
Satoru Nojima
悟 野島
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 General Ltd
Original Assignee
Fujitsu General 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 General Ltd filed Critical Fujitsu General Ltd
Priority to JP7279390A priority Critical patent/JPH03272217A/en
Publication of JPH03272217A publication Critical patent/JPH03272217A/en
Pending legal-status Critical Current

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  • Selective Calling Equipment (AREA)
  • Keying Circuit Devices (AREA)
  • Electronic Switches (AREA)

Abstract

PURPOSE:To prevent mutual leakage between input signals of two systems and malfunction by plugging in a plug to a plug receptacle connector to input a one system of remote control signal to two input signal circuits of two systems of a remote controller. CONSTITUTION:The connection circuit of a 1st terminal 2 of a connector 1 connects to one terminal of a NAND gate 11, the connection circuit of a 2nd terminal 3 connecting to the 1st terminal 2 via a moving contact 5 provided in the connector 1 connects to an inverter gate 8 and its output terminal connects to the other terminal of the NAND gate 11. An output signal from the NAND gate 11 is inputted to one terminal of a NAND gate 13 and the output signal of a NAND gate 12 is inputted to the other terminal of the NAND gate 13. That is, two input signals for two systems of input signal circuits of a remote controller are surely selected by plugging a plug to a plug receptacle connector 1, and inputting one system of remote control signal to the connector, and logic circuits are employed for the switching circuit of the controller.

Description

【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、信号切換装置に関し、特にプラグ差し込み用
コネクタにプラグを挿入して信号入力することにより論
理回路を動作させて入力信号を切り換えて出力する装置
に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a signal switching device, and particularly to a signal switching device that operates a logic circuit and switches input signals by inserting a plug into a plug connector and inputting a signal. Regarding output devices.

最近の機器はリモコンによって離れた所から機器を操作
できるようにしたものが多く、また、リモコンに用いら
れている信号はデジタル信号を利用しているものが一般
的である。Many recent devices are equipped with remote controls that allow them to be operated from a distance, and signals used in remote controls generally use digital signals.

〔従来の技術〕[Conventional technology]

従来の技術においては、リモコンによる入力信号が２系
統ある場合の入力信号の選択はスイッチで切り換えて行
うこと等が考えられるが、機械的スイッチを使用した場
合は偶然の接触によりスイッチが操作されたり、スイッ
チの配線回路等により信号の漏洩を生じて誤動作する恐
れ等がある。In conventional technology, when there are two systems of input signals from a remote control, it is possible to select the input signal by switching with a switch, but if a mechanical switch is used, the switch may be operated by accidental contact. There is a risk that signal leakage may occur due to the switch wiring circuit, etc., resulting in malfunction.

〔発明が解決しようとする課題〕 従って本発明は、２系統あるリモコンの入力信号回路を
プラグ差し込み用コネクタにプラグを挿入して１系統の
リモコン信号を入力することにより確実に入力信号の切
換を行い、切換回路に論理回路を使用することにより入
力信号同士の漏洩を防いで誤動作を防ぐことを目的とす
る。[Problems to be Solved by the Invention] Therefore, the present invention reliably switches input signals by inserting a plug into the plug connector for input signal circuits of two remote control systems and inputting one remote control signal. The purpose is to prevent malfunctions by preventing input signals from leaking into each other by using logic circuits in switching circuits.

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

第１図のように第１信号入力用としてプラグ差し込み用
コネクタ１を設け、同コネクタの第１端子２の接続回路
に第１分岐点を設けて同第１分岐点より分岐させた一方
を抵抗器１０を介して供給電源Ｖ。０に接続し、同第１
分岐点より分岐させた他方をＮＡＮＤゲート１１の一端
に接続し、前記コネクタ内に設けた可動接触片５を介し
て前記第１端子２と接続されている第２端子３の接続回
路に第２分岐点を設けて同第２分岐点より分岐させた第
１分岐を抵抗器７を介してアースに接続し、同第２分岐
点より分岐させた第２分岐をインバータゲート８に入力
し、同インバータゲート８の出力を前記ＮＡＮＤゲート
１１の他端に接続し、同ＮＡＮＤゲート１１の出力をＮ
ＡＮＤゲート１３の一端に入力し、前記第２分岐点より
分岐させた第３分岐をＮＡＮＤゲート１２の一端に接続
し同一　３　＝ ＮＡＮＤゲート１２の他端に第２信号の入力回路を接続
して、同ＮＡＮＤゲート１２の出力を前記ＮＡＮＤゲー
ト１３の他端に入力して同ＮＡＮＤゲート１３の出力回
路より回路出力を取り出すようにし、前記プラグ差し込
み用コネクタ１に入力プラグ１５が差し込まれていない
場合は前記第２信号がＮＡＮＤゲート１２で反転して出
力されてＮＡＮＤゲート１３に入力され同ＮＡＮＤゲー
ト１３で再度反転されて出力されることにより前記第２
信号が前記出力回路より出力され、前記プラグ差し込み
用コネクタ１に入力プラグ１５が差し込まれて前記第１
信号が入力された場合は可動接触片５による第１端子２
と第２端子３の接続が解除されて同第１信号が同第１端
子２を介してＮＡＮＤゲート１１に入力され同入力が同
ＮＡＮＤゲート１１で反転して出力されてＮＡＮＤゲー
ト１３に入力され同ＮＡＮＤゲート１３で再度反転され
て出力されることにより前記第１信号が前記出力回路よ
り出力されるようにしたものである。As shown in Figure 1, a plug-in connector 1 is provided for the first signal input, a first branch point is provided in the connection circuit of the first terminal 2 of the connector, and one branched from the first branch point is connected to a resistor. A power supply V is supplied through the device 10. 0 and the same 1st
The other branched from the branch point is connected to one end of the NAND gate 11, and a second A branch point is provided and the first branch branched from the second branch point is connected to the ground via the resistor 7, and the second branch branched from the second branch point is inputted to the inverter gate 8. The output of the inverter gate 8 is connected to the other end of the NAND gate 11, and the output of the NAND gate 11 is connected to the NAND gate 11.
The signal is input to one end of the AND gate 13, and the third branch branched from the second branch point is connected to one end of the NAND gate 12. , when the output of the NAND gate 12 is input to the other end of the NAND gate 13 and the circuit output is taken out from the output circuit of the NAND gate 13, and the input plug 15 is not inserted into the plug connector 1. The second signal is inverted by the NAND gate 12, outputted, inputted to the NAND gate 13, inverted again by the NAND gate 13, and outputted.
A signal is output from the output circuit, and the input plug 15 is inserted into the plug insertion connector 1 and the first
When a signal is input, the first terminal 2 is connected to the movable contact piece 5.
and the second terminal 3 are disconnected, the first signal is input to the NAND gate 11 via the first terminal 2, the same input is inverted by the NAND gate 11 and output, and input to the NAND gate 13. The first signal is outputted from the output circuit by being inverted again by the same NAND gate 13 and outputted.

〔作用〕[Effect]

本発明では、第３図に示すようなＮＡＮＤゲートを使用
し、論理表に示すように入力ピンの一方にＣ信号として
Ｈ信号を入力すれば入力ピンの他方に入力するＤ信号の
Ｌ信号あるいはＨ信号に応じて出力にＤ信号の反転した
出力信号が得られることを利用してリモコンのデジタル
信号を切り換えて出力するようにしてあり、第１図の回
路ではＮＡＮＤゲート１２の入力ピンの一方に供給電源
ＶＣＣより第１端子２、可動接触片５、第２端子３を経
由してＨ信号が加えられており、また、同Ｈ信号はイン
バータゲート８にも入力されており同インバータゲート
８でＬ信号に反転されてＮＡＮＤゲート１１に入力され
ているため、ＮＡＮＤゲート１１からＨ信号が出力され
ＮＡＮＤゲート１３の入力ピンの一方にＨ信号が加えら
れており、ＮＡＮＤゲート１２の入力ピンの他方に加え
られた信号ＡはＮＡＮＤゲート１２で反転して出力され
てＮＡＮＤゲート１３に入力され、同ＮＡＮＤゲート１
３で再度反転して出力されるため、出力端子１４に入力
信号Ａと同じ出力信号が得られ、第２図の回路ではプラ
グ差し込み用コネクタ１に入力プラグ１５が差し込まれ
た場合は、可動接触片５による第１端子２と第２端子３
の接続が解除されるため第２端子３は低電圧レベルのＬ
信号状態となり、同り信号がインバータゲート８とＮＡ
ＮＤゲート１２に加えられているため、ＮＡＮＤゲート
１２からはＨ信号が出力されてＮＡＮＤゲート１３の入
力ピンの一方にＨ信号を加え、インバータゲート８から
は入力信号が反転されたＨ信号が出力されてＮＡＮＤゲ
ー）１１の入力ピンの一方にＨ信号を加えるため、前記
入力プラグ１５で入力された信号Ｂは可動接触片５、第
１端子２を経由して前記ＮＡＮＤゲート１１の入力ピン
の他方に入力されるため、同ＮＡＮＤゲート１１で反転
して出力されて前記ＮＡＮＤゲート１３の入力ピンの他
方に入力し、同ＮＡＮＤゲート１３で再度反転して出力
されるため出力端子１４に入力信号Ｂと同じ出力信号が
得られるようにしている。In the present invention, a NAND gate as shown in FIG. 3 is used, and as shown in the logic table, if an H signal is input as a C signal to one of the input pins, an L signal or a D signal input to the other input pin. Taking advantage of the fact that an inverted output signal of the D signal is obtained in response to the H signal, the digital signal of the remote control is switched and output.In the circuit shown in FIG. An H signal is applied from the power supply VCC to the inverter gate 8 via the first terminal 2, the movable contact piece 5, and the second terminal 3, and the H signal is also input to the inverter gate 8. Since the signal is inverted to L and input to NAND gate 11, the H signal is output from NAND gate 11 and applied to one of the input pins of NAND gate 13, and the input pin of NAND gate 12 is inverted. The signal A applied to the other side is inverted by the NAND gate 12, outputted, and input to the NAND gate 13.
3, the signal is inverted again and output, so the same output signal as the input signal A is obtained at the output terminal 14. In the circuit shown in FIG. 2, when the input plug 15 is inserted into the plug connector 1, the movable contact First terminal 2 and second terminal 3 by piece 5
Since the connection is released, the second terminal 3 is at the low voltage level L.
signal state, and the same signal is connected to inverter gate 8 and NA
Since it is applied to the ND gate 12, the H signal is output from the NAND gate 12, and the H signal is applied to one of the input pins of the NAND gate 13, and the H signal, which is the inverted input signal, is output from the inverter gate 8. In order to apply an H signal to one of the input pins of the NAND gate 11, the signal B inputted by the input plug 15 passes through the movable contact piece 5 and the first terminal 2 to the input pin of the NAND gate 11. Since the input signal is input to the other terminal, it is inverted by the same NAND gate 11 and outputted, and inputted to the other input pin of the NAND gate 13, and is inverted again by the same NAND gate 13 and outputted, so the input signal is sent to the output terminal 14. The same output signal as B is obtained.

［実施例］ 第１図は本発明の一実施例を示す信号切換装置の電気回
路図であり、第２図は本発明の一実施例を示す信号切換
装置のプラグ差し込み用コネクタに入力プラグを差し込
んだ状態を示す電気回路図である。[Embodiment] Fig. 1 is an electrical circuit diagram of a signal switching device showing an embodiment of the present invention, and Fig. 2 shows an example of an input plug inserted into a plug connector of a signal switching device showing an embodiment of the present invention. It is an electric circuit diagram showing the inserted state.

第１図及び第２図に示すもので同一のものは同一の記号
で示してあり、１は信号Ｂの入力用のプラグ差し込み用
コネクタであり、同コネクタ１の第１端子２の接続回路
に第１分岐点を設けて同第１分岐点より分岐させた一方
と抵抗器１０を介して供給電源Ｖ　ＣＣが加えられてい
る入力端子９とを接続し、同第１分岐点より分岐させた
他方とＮＡＮＤゲート１１の一端とを接続し、前記コネ
クタ１内に設けた可動接触片５を介して前記第１端子２
と接続されている第２端子３の接続回路に第２分岐点を
設けて同第２分岐点より分岐させた第１分岐を抵抗器７
を介してアースに接続し、同第２分岐点より分岐させた
第２分岐をインバータゲート８に入力し、同インバータ
ゲート８の出力を前記ＮＡＮＤゲート１１の他端に接続
し、同ＮＡＮＤゲー）１１の出力をＮＡＮＤゲート１３
の一端子 に入力し、前記第２分岐点より分岐させた第３分岐をＮ
ＡＮＤゲート１２の一端に接続し同ＮＡＮＤゲート１２
の他端と入力端子６とを接続して同入力端子６に信号Ａ
を入力して、同ＮＡＮＤゲート１２の出力を前記ＮＡＮ
Ｄゲート１３の他端に入力して同ＮＡＮＤゲート１３の
出力回路と出力端子１４とを接続して同出力端子１４よ
り信号切換装置の出力を取り出すようにしている。The same parts shown in Figures 1 and 2 are indicated by the same symbols, and 1 is a plug connector for inputting signal B, and is connected to the connection circuit of the first terminal 2 of the connector 1. A first branch point is provided and one branched from the first branch point is connected to the input terminal 9 to which the supply power V CC is applied via a resistor 10, and the branch is branched from the first branch point. The other terminal is connected to one end of the NAND gate 11, and the first terminal 2 is connected to the first terminal 2 via a movable contact piece 5 provided in the connector 1.
A second branch point is provided in the connection circuit of the second terminal 3 connected to the resistor 7, and a first branch branched from the second branch point is connected to the resistor 7.
The second branch branched from the second branch point is input to the inverter gate 8, and the output of the inverter gate 8 is connected to the other end of the NAND gate 11. 11 output to NAND gate 13
input to one terminal of N, and the third branch branched from the second branch point is N
Connected to one end of the AND gate 12
Connect the other end to input terminal 6 and send signal A to input terminal 6.
is input, and the output of the same NAND gate 12 is inputted to the NAND gate 12.
The signal is inputted to the other end of the D gate 13, and the output circuit of the NAND gate 13 is connected to the output terminal 14, so that the output of the signal switching device is taken out from the output terminal 14.

第１図の回路では入力端子９に加えられている供給電源
Ｖ　ＣＣは抵抗器１０、第１端子２、可動接触片５、第
２端子３及び抵抗器７を介してアースと接続されており
、抵抗器７の値を抵抗器１０の値より大きくすることに
より、供給電源ＶＣＣを同抵抗器７と同抵抗器１０で分
割した高電圧レベルのＨ信号を第２端子３に発生させる
ことができ、当Ｈ信号がＮＡＮＤゲート１２の入力ピン
の一方及びインバータゲート８にも入力されており同イ
ンバータゲート８でＬ信号に反転されてＮＡＮＤゲート
１１に入力されるため、ＮＡＮＤゲート１１からＨ信号
が出力されＮＡＮＤゲート１３の入　８ カビンの一方にＨ信号が加えられており、ＮＡＮＤゲー
ト１２の入力ピンの他方に加えられた信号ＡはＮＡＮＤ
ゲート１２の入力ピンの一方に前記Ｈ信号が加えられて
いるため反転して出力されてＮＡＮＤゲート１３の入力
ピンの他方に入力さ孔間ＮＡＮＤゲート１３の入力ピン
の一方にＨ信号が加えられているため再度反転して出力
されるため、出力端子１４に入力信号Ａと同じ出力信号
が得られる。In the circuit shown in FIG. 1, the power supply VCC applied to the input terminal 9 is connected to ground via the resistor 10, the first terminal 2, the movable contact piece 5, the second terminal 3, and the resistor 7. By making the value of the resistor 7 larger than the value of the resistor 10, it is possible to generate a high voltage level H signal at the second terminal 3, which is obtained by dividing the power supply VCC by the resistor 7 and the resistor 10. The H signal is also input to one of the input pins of the NAND gate 12 and the inverter gate 8, and the inverter gate 8 inverts it to an L signal and inputs it to the NAND gate 11, so the H signal is output from the NAND gate 11. is output and input to the NAND gate 13. 8 An H signal is applied to one side of the pin, and the signal A applied to the other input pin of the NAND gate 12 is a NAND signal.
Since the H signal is applied to one of the input pins of the gate 12, it is inverted and output and input to the other input pin of the NAND gate 13.The H signal is applied to one of the input pins of the NAND gate 13 between the holes. Therefore, since the signal is inverted again and output, the same output signal as the input signal A is obtained at the output terminal 14.

第２図の回路ではプラグ差し込み用コネクタ１に入力プ
ラグ１５が差し込まれて信号Ｂが入力されており、入力
プラグ１５の信号電極と可動接触片５とが接触状態とな
り可動接触片５による集１端子２と第２端子３の接続が
解除されるため第２端子３は低電圧レベルのＬ信号状態
となり、同り信号がインバータゲート８とＮＡＮＤゲー
ト１２に加えられているため、ＮＡＮＤゲート１２から
はＨ信号が出力されてＮＡＮＤゲート１３の入力ピンの
一方にＨ信号を加え、インバータゲート８からは入力信
号が反転されたＨ信号が出力されてＮＡＮＤゲート１１
の入力ピンの一方にＨ信号を加えるため、前記入力プラ
グ１５で入力された信号Ｂは可動接触片５、第１端子２
を経由して前記ＮＡＮＤゲート１１の入力ビンの他方に
入力さ孔間ＮＡＮＤゲート１１で反転して出力されて前
記ＮＡＮＤゲート１３の入力ビンの他方に入力し、同Ｎ
ＡＮＤゲート１３で再度反転して出力されるため出力端
子１４に入力信号Ｂと同じ出力信号が得られる。In the circuit shown in FIG. 2, the input plug 15 is inserted into the plug connector 1 and the signal B is input, and the signal electrode of the input plug 15 and the movable contact piece 5 are in contact with each other, so that the signal electrode of the input plug 15 is brought into contact with the movable contact piece 5. Since the connection between the terminal 2 and the second terminal 3 is released, the second terminal 3 becomes an L signal state of a low voltage level, and since the same signal is applied to the inverter gate 8 and the NAND gate 12, the signal from the NAND gate 12 is outputs an H signal and applies the H signal to one of the input pins of the NAND gate 13, and the inverter gate 8 outputs an H signal, which is the inverted input signal, and applies the H signal to one of the input pins of the NAND gate 11.
In order to apply an H signal to one of the input pins of
is inputted to the other input bin of the NAND gate 11 via the hole NAND gate 11, inverted and outputted, inputted to the other input bin of the NAND gate 13,
Since the signal is inverted again by the AND gate 13 and outputted, the same output signal as the input signal B is obtained at the output terminal 14.

前記プラグ差し込み用コネクタ１の代わりに第４図に示
すように信号Ｂの入力用の入力端子１６とスイッチ１７
を設けて、同入力端子１６と他端が供給電源の入力端子
９に接続されている抵抗器１０の一端とを接続し、さら
に前記スイッチ１７の一端と同抵抗器１０の一端とを接
続し、同スイッチ１７の他端と他端がアースに接続され
ている抵抗器７の一端とを接続して、信号切換装置の出
力信号として信号Ｂを得る場合は前記スイッチ１７を遮
断状態とし、信号切換装置の出力信号として信号Ａを得
る場合は前記スイッチ１７を接続状態とするようにして
も良い。In place of the plug connector 1, as shown in FIG. 4, an input terminal 16 for inputting the signal B and a switch 17 are provided.
The input terminal 16 is connected to one end of the resistor 10 whose other end is connected to the input terminal 9 of the power supply, and one end of the switch 17 is connected to one end of the resistor 10. , when connecting the other end of the switch 17 and one end of the resistor 7 whose other end is connected to ground to obtain the signal B as the output signal of the signal switching device, the switch 17 is cut off and the signal is When obtaining signal A as the output signal of the switching device, the switch 17 may be in a connected state.

〔発明の効果〕〔Effect of the invention〕

以上説明したように、本発明によれば２系統あるリモコ
ンの入力信号回路をプラグ差し込み用コネクタにプラグ
を挿入して１系統のリモコン信号を入力することにより
確実に入力信号の切換を行い、切換回路に論理回路を使
用することにより入力信号同士の漏洩を防いで誤動作を
防止した信号切換装置を提供することができる。As explained above, according to the present invention, the input signal can be reliably switched by inserting the plug into the plug connector for the input signal circuit of the remote control, which has two systems, and inputting the remote control signal of one system. By using a logic circuit in the circuit, it is possible to provide a signal switching device that prevents leakage of input signals and prevents malfunctions.

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

第１図は本発明の一実施例を示す信号切換装置の電気回
路図、第２図は本発明の一実施例を示す信号切換装置の
プラグ差し込み用コネクタにプラグを差し込んだ状態を
示す電気回路図、第３図はＮＡＮＤゲートの記号と入出
力状態を示す論理表、第４図は本発明の他の実施例を示
す信号切換装置の電気回路図である。 １−−一−−プラグ差し込み用コネクタ、２，３．４・
−接続端子、５−・−可動接触片、６，９．１６−入力
端子、７，１０・−抵抗器、８−・−イン−１１ ２ バータゲート、１１．１２．１３ 一ト、１４−　　出力端子、１５ １７・・−スイッチ。 ＮＡＮＤゲ 入力プラグ、Fig. 1 is an electrical circuit diagram of a signal switching device showing an embodiment of the present invention, and Fig. 2 is an electrical circuit diagram showing a state in which a plug is inserted into a plug connector of the signal switching device showing an embodiment of the present invention. 3 is a logic table showing symbols and input/output states of NAND gates, and FIG. 4 is an electric circuit diagram of a signal switching device showing another embodiment of the present invention. 1--1--Connector for plug insertion, 2, 3.4.
-Connection terminal, 5--Movable contact piece, 6,9.16-Input terminal, 7,10-Resistor, 8--In-11 2 Barter gate, 11.12.13 One, 14-Output Terminal, 15 17...-Switch. NAND input plug,

Claims (1)

【特許請求の範囲】[Claims] 第１信号入力用としてプラグ差し込み用コネクタを設け
、同コネクタの第１端子の接続回路に第１分岐点を設け
て同第１分岐点より分岐させた一方を第１抵抗器を介し
て供給電源に接続し、同第１分岐点より分岐させた他方
を第１ＮＡＮＤゲートの一端に接続し、前記コネクタ内
に設けた可動接触片を介して前記第１端子と接続されて
いる第２端子の接続回路に第２分岐点を設けて同第２分
岐点より分岐させた第１分岐を第２抵抗器を介してアー
スに接続し、同第２分岐点より分岐させた第２分岐をイ
ンバータゲートに入力し、同インバータゲートの出力を
前記第１ＮＡＮＤゲートの他端に接続し、同第１ＮＡＮ
Ｄゲートの出力を第３ＮＡＮＤゲートの一端に入力し、
前記第２分岐点より分岐させた第３分岐を第２ＮＡＮＤ
ゲートの一端に接続し同第２ＮＡＮＤゲートの他端に第
２信号の入力回路を接続して、同第２ＮＡＮＤゲートの
出力を前記第３ＮＡＮＤゲートの他端に入力して同第３
ＮＡＮＤゲートより回路出力を取り出すことを可能とし
た回路において、前記プラグ差し込み用コネクタに入力
プラグが差し込まれていない場合は、前記第２信号が前
記第２ＮＡＮＤゲートで反転して出力されて前記第３Ｎ
ＡＮＤゲートに入力され、同第３ＮＡＮＤゲートで再度
反転されて出力されることにより前記第２信号が出力さ
れ、前記プラグ差し込み用コネクタに入力プラグが差し
込まれて前記第１信号が入力された場合は、前記可動接
触片による前記第１端子と第２端子の接続が解除されて
同第１信号が同第１端子に伝えられるようにして同第１
端子より前記第１ＮＡＮＤゲートに入力され、同入力が
第１ＮＡＮＤゲートで反転して出力されて前記第３ＮＡ
ＮＤゲートに入力され、同第３ＮＡＮＤゲートで再度反
転されて出力されることにより前記第１信号を出力せし
めることを特徴とする信号切換装置。A plug-in connector is provided for the first signal input, a first branch point is provided in the connection circuit of the first terminal of the connector, and one branched from the first branch point is supplied with power via the first resistor. and the other branched from the first branch point is connected to one end of the first NAND gate, and the second terminal is connected to the first terminal via a movable contact piece provided in the connector. Provide a second branch point in the circuit, connect the first branch branched from the second branch point to the ground via the second resistor, and connect the second branch branched from the second branch point to the inverter gate. the output of the inverter gate is connected to the other end of the first NAND gate, and the output of the inverter gate is connected to the other end of the first NAND gate.
Input the output of the D gate to one end of the third NAND gate,
The third branch branched from the second branch point is connected to the second NAND
A second signal input circuit is connected to one end of the gate and the other end of the second NAND gate, and the output of the second NAND gate is inputted to the other end of the third NAND gate.
In a circuit that makes it possible to take out a circuit output from a NAND gate, when the input plug is not inserted into the plug connector, the second signal is inverted and outputted by the second NAND gate, and the second signal is inverted and output from the third NAND gate.
When the second signal is output by being input to the AND gate, inverted again by the third NAND gate, and the first signal is input by inserting the input plug into the plug connector, , the connection between the first terminal and the second terminal by the movable contact piece is released, and the first signal is transmitted to the first terminal.
The input is input from the terminal to the first NAND gate, and the same input is inverted by the first NAND gate and outputted to the third NAND gate.
A signal switching device characterized in that the first signal is output by being input to an ND gate, inverted again by the third NAND gate, and output.
JP7279390A 1990-03-22 1990-03-22 Signal changeover device Pending JPH03272217A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7279390A JPH03272217A (en) 1990-03-22 1990-03-22 Signal changeover device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7279390A JPH03272217A (en) 1990-03-22 1990-03-22 Signal changeover device

Publications (1)

Publication Number Publication Date
JPH03272217A true JPH03272217A (en) 1991-12-03

Family

ID=13499626

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7279390A Pending JPH03272217A (en) 1990-03-22 1990-03-22 Signal changeover device

Country Status (1)

Country Link
JP (1) JPH03272217A (en)

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