JPH02256317A - Switching device - Google Patents

Switching device

Info

Publication number
JPH02256317A
JPH02256317A JP1077073A JP7707389A JPH02256317A JP H02256317 A JPH02256317 A JP H02256317A JP 1077073 A JP1077073 A JP 1077073A JP 7707389 A JP7707389 A JP 7707389A JP H02256317 A JPH02256317 A JP H02256317A
Authority
JP
Japan
Prior art keywords
signal
circuit
conversion
switching
input
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
JP1077073A
Other languages
Japanese (ja)
Inventor
Shinichi Kosaka
幸坂 信一
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.)
NEC Corp
Original Assignee
NEC 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 NEC Corp filed Critical NEC Corp
Priority to JP1077073A priority Critical patent/JPH02256317A/en
Publication of JPH02256317A publication Critical patent/JPH02256317A/en
Pending legal-status Critical Current

Links

Landscapes

  • Logic Circuits (AREA)

Abstract

PURPOSE:To avoid troublesome switching and to obtain a circuit preventing a fault due to mis-switching or improper operation by detecting a level of 1st and 2nd signals and converting the level of the signal to a TTL level. CONSTITUTION:A level of an inputted signal is detected by a voltage detection circuit 1, in which whether a 1st signal or a 2nd signal is received is judged. Based on the result of judgement a 1st switching circuit 2 connects a 1st conversion circuit 4 or a 2nd conversion circuit 5 to an input and output terminal of the title switching device. The level of the input signal is converted into a TTL level by the 1st conversion circuit 4 or the 2nd conversion circuit 5, and the output signal is processed reversely to above. A 2nd switching circuit 3 selects either the 1st signal or the 2nd signal. A signal representing which of the 1st and 2nd signals is selected is inputted from the voltage detection circuit 1 to a controller 6, and even when the 1st and 2nd signals give a different semantic the switch device is controlled.

Description

【発明の詳細な説明】 [産業上の利用分野] 本発明は、外部インタフェースから入力するレベルの異
なる第−信号若しくは第二信号に係る切替装置に関し、
特に、v、11とv、28との信号に係る切替装置に関
する。
[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a switching device relating to a first signal or a second signal of different levels input from an external interface,
In particular, the present invention relates to a switching device for signals v,11 and v,28.

[従来の技術] 従来の切替装置は、外部インタフェースから入力するレ
ベルの異なる第一信号及び第二信号、例えば、第一信号
としてのV、11、第二信号としてのv、28で説明す
ると、このV、11及びv、28のいずれか一方が入力
したとき、各信号に対応した所定の変換を行なう変換回
路に切替えて入力信号を該当する変換回路に送出してお
り、この該当する変換回路への切替は装置内にある手動
スイッチによって行っていた。
[Prior Art] A conventional switching device is explained by using a first signal and a second signal of different levels inputted from an external interface, for example, V, 11 as the first signal and v, 28 as the second signal. When either one of these V, 11 and v, 28 is input, it switches to a conversion circuit that performs a predetermined conversion corresponding to each signal, and sends the input signal to the corresponding conversion circuit. This was done using a manual switch inside the device.

[発明が解決しようとする課題] 然しながら、上述した従来の切替装置においては、v、
11若しくはV、28の入力時に、手動によりスイッチ
を動作させて、V、11若しくはV、28に該当する変
換回路への切替を行っていたために、切替が煩雑になり
でおり、また、切替を間違うと動作不良になったり、故
障したりするという欠点があった。
[Problems to be Solved by the Invention] However, in the conventional switching device described above, v,
When 11, V, or 28 is input, a switch is manually operated to switch to the conversion circuit corresponding to V, 11, or V, or 28, which makes the switching complicated. The drawback is that if you make a mistake, it may malfunction or break down.

[課題を解決するための手段] このような問題点を解決するための本発明の技術的手段
は、外部インタフェースからレベルの異なる第一信号及
び第二信号のいずれか一方が入力したとき、入力した信
号に対応する所定の変換に切替えて制御装置に出力する
切替装置において、第一信号なTTL変換する第一変換
回路と、第二信号をTTL変換する第二変換回路と、第
一信号及び第二信号の信号レベルを検出していずれの信
、号が入力したかを判断する検出回路と、検出回路の判
断結果に基づいて入力した第一及び第二信号のいずれか
の信号を該当する第一及び第二変換回路のいずれかに送
出する第一切替回路と、検出回路の判断結果に基づいて
第一及び第二変換回路のいずれかからの該当する変換信
号を選択して制御装置に送出する第二切替回路とを備え
たものである。
[Means for Solving the Problems] The technical means of the present invention for solving such problems is that when either the first signal or the second signal with different levels is input from the external interface, the input A switching device that switches to a predetermined conversion corresponding to a signal and outputs it to a control device, a first conversion circuit that performs TTL conversion of the first signal, a second conversion circuit that performs TTL conversion of the second signal, and a first conversion circuit that performs TTL conversion of the first signal. A detection circuit that detects the signal level of the second signal and determines which signal is input, and a detection circuit that detects the signal level of the second signal and determines which signal is input based on the judgment result of the detection circuit. The first switching circuit sends out to either the first or second conversion circuit, and the corresponding conversion signal from either the first or second conversion circuit is selected based on the judgment result of the detection circuit and sent to the control device. and a second switching circuit for sending the signal.

[実施例コ 次に、本発明の実施例に係る切替装置について図面を参
照して説明する。
[Embodiment] Next, a switching device according to an embodiment of the present invention will be described with reference to the drawings.

第1図は、本発明の一実施例に係る切替装置のブロック
図である。実施例においては、外部インタフェースから
レベルの異なる第一信号(以下rV、llという」)若
しくは第二信号(以下rV、28という」)が入力する
。実施例に係る切替装置は、V、11をTTL変換する
第一変換回路4と、■。
FIG. 1 is a block diagram of a switching device according to an embodiment of the present invention. In the embodiment, a first signal (hereinafter referred to as rV, 11) or a second signal (hereinafter referred to as rV, 28) having different levels is input from an external interface. The switching device according to the embodiment includes a first conversion circuit 4 that converts V, 11 to TTL, and (2).

28をTTL変換する第二変換回路5と、■、11及び
V、28の信号レベルを検出しいずれかの信号が入力し
たかを判断する電圧検出回路1と、電圧検出回路1がv
、11が入力したと判断したときこの判断結果に基づい
て入力した■、11を第一変換回路4に送出するととも
に電圧検出回路1がv、28が入力したと判断したとき
この判断結果に基づいて入力したV、28を第二変換回
路5に送出する第一切替回路2と、電圧検出回路1がV
、11が入力したと判断したときこの判断結果に基づい
て第一変換回路4の変換信号を選択して制御装置6に送
出するとともに電圧検出回路1がv、28が入力したと
判断したときこの判断結果に基づいて第二変換回路5の
変換信号を選択して制御装置6に送出する第二切替回路
3とを備えて構成されている。即ち、電圧検出回路1は
本装置への入出力信号がv、11又はv、28の信号の
どちらの信号であるかの判定をする回路てあり、第一切
替回路2は本装置への入出力信号なV、11HTTL変
換回路としての第一変換回路4、又は、V、28WTT
L変換回路としての第二変換回路5のいずれかに接続す
る切替を行う回路である。また、第二切替回路3は、■
、11又はv、28の信号がTTLに変換された後の切
替回路である。■。
A second conversion circuit 5 performs TTL conversion of 28, a voltage detection circuit 1 detects the signal levels of
, 11 is input, based on this determination result, the input ■, 11 is sent to the first conversion circuit 4, and when the voltage detection circuit 1 determines that v, 28 is input, based on this determination result. The first switching circuit 2 sends the input V, 28 to the second conversion circuit 5, and the voltage detection circuit 1
, 11 is input, the conversion signal of the first conversion circuit 4 is selected based on this judgment result and sent to the control device 6, and when the voltage detection circuit 1 determines that v, 28 is input, this signal is selected. The second switching circuit 3 selects the conversion signal of the second conversion circuit 5 based on the determination result and sends it to the control device 6. That is, the voltage detection circuit 1 is a circuit that determines whether the input/output signal to this device is the signal v, 11 or the signal v, 28, and the first switching circuit 2 is a circuit that determines whether the input/output signal to this device is the signal v, 11 or the signal v, 28. The first conversion circuit 4 as an output signal V, 11HTTL conversion circuit or V, 28WTT
This is a circuit that performs switching to connect to one of the second conversion circuits 5 as L conversion circuits. Moreover, the second switching circuit 3 is
, 11 or v, 28 is a switching circuit after the signals are converted to TTL. ■.

11MTTL変換回路としての第一変換回路4は、■、
11の信号とTTL信号とのレベル変換を行う回路であ
り、V、284−)TTL変換回路としての第二変換回
路5はv、28の信号とTTL信号とのレベル変換を行
う回路である。制御装置6は、相手装置との信号の送受
を制御するものである。
The first conversion circuit 4 as an 11MTTL conversion circuit is: ■,
The second conversion circuit 5, which serves as a V, 284-) TTL conversion circuit, is a circuit that performs level conversion between the signal V, 28 and the TTL signal. The control device 6 controls the transmission and reception of signals with the other device.

次に、この切替装置の動作を説明する。本装置へ信号が
入力されると、電圧検出回路1でその信号レベルが検出
され、■、11かv、28かの判断が行われる。干の判
断結果をもとに第一切替回路2にて、第一変換回路4又
は、第二変換回路5を本装置への入出力端子に接続する
。そして、入力信号は、第−若しくは第二変換回路によ
り、TTLに変換され、出力信号は、TTLからV、1
1又はV、28へ変換される。このとき第二切替回路3
も、電圧検出回路1の出力により、v、11とV、28
のいずれかに係る変換信号を制御装置6に送出するかか
選択されている。このように動作することにより、本装
置への入出力信号は、制御装置6に接続される。また、
制御装置には、上記電圧検出回路1からV、11とv、
28のどちらを選んだかという信号が入力されており、
■、11とv、28で信号の意味が異なっていたとして
も、制御を行うことかできる。
Next, the operation of this switching device will be explained. When a signal is input to this device, the voltage detection circuit 1 detects the signal level and determines whether the signal is 11 (■) or 28 (v). Based on the result of the determination, the first switching circuit 2 connects the first conversion circuit 4 or the second conversion circuit 5 to the input/output terminal of the device. Then, the input signal is converted to TTL by the first or second conversion circuit, and the output signal is converted from TTL to V, 1
1 or V, converted to 28. At this time, the second switching circuit 3
Also, by the output of voltage detection circuit 1, v,11 and V,28
It is selected whether the conversion signal related to any one of the following is to be sent to the control device 6. By operating in this way, the input/output signals to this device are connected to the control device 6. Also,
The control device includes voltage detection circuits 1 to V, 11 and v,
A signal indicating which one of 28 was selected is input,
Even if the meanings of the signals are different between (2), 11 and v, 28, control can still be performed.

[発明の効果コ 以上説明したように本発明の切替装置によれば、第一信
号と第二信号とのレベルを検出することにより自動的に
第一信号とTTL又は第二信号とTTLのレベル変換を
行なうことができるので、手動で切替えることによる煩
雑さや、切替の間違いによる故障や、動作不良を防ぐこ
とができる効果かある。
[Effects of the Invention] As explained above, according to the switching device of the present invention, by detecting the levels of the first signal and the second signal, the levels of the first signal and TTL or the second signal and TTL are automatically changed. Since the conversion can be performed, it is possible to avoid the complexity of manual switching, failures due to incorrect switching, and malfunctions.

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

第1図は本発明の実施例に係る切替装置を示すブロック
図である。 電圧検出回路 :第二切替回路 :第二変換回路
FIG. 1 is a block diagram showing a switching device according to an embodiment of the present invention. Voltage detection circuit: Second switching circuit: Second conversion circuit

Claims (1)

【特許請求の範囲】[Claims] 外部インタフェースからレベルの異なる第一信号及び第
二信号のいずれか一方が入力したとき、入力した信号に
対応する所定の変換に切替えて制御装置に出力する切替
装置において、第一信号をTTL変換する第一変換回路
と、第二信号をTTL変換する第二変換回路と、第一信
号及び第二信号の信号レベルを検出していずれの信号が
入力したかを判断する検出回路と、検出回路の判断結果
に基づいて入力した第一及び第二信号のいずれかの信号
を該当する第一及び第二変換回路のいずれかに送出する
第一切替回路と、検出回路の判断結果に基づいて第一及
び第二変換回路のいずれかからの該当する変換信号を選
択して制御装置に送出する第二切替回路とを備えたこと
を特徴とする切替装置。
When either the first signal or the second signal with different levels is input from an external interface, the first signal is converted to TTL in a switching device that switches to a predetermined conversion corresponding to the input signal and outputs it to the control device. a first conversion circuit, a second conversion circuit that performs TTL conversion of the second signal, a detection circuit that detects the signal levels of the first signal and the second signal to determine which signal is input; a first switching circuit that sends either the first or second signal inputted based on the judgment result to the corresponding first or second conversion circuit; and a second switching circuit that selects a corresponding conversion signal from one of the second conversion circuits and sends it to a control device.
JP1077073A 1989-03-29 1989-03-29 Switching device Pending JPH02256317A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1077073A JPH02256317A (en) 1989-03-29 1989-03-29 Switching device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1077073A JPH02256317A (en) 1989-03-29 1989-03-29 Switching device

Publications (1)

Publication Number Publication Date
JPH02256317A true JPH02256317A (en) 1990-10-17

Family

ID=13623619

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1077073A Pending JPH02256317A (en) 1989-03-29 1989-03-29 Switching device

Country Status (1)

Country Link
JP (1) JPH02256317A (en)

Similar Documents

Publication Publication Date Title
JPH02256317A (en) Switching device
JPS62112451A (en) Setting system for selective signal system
JP3910321B2 (en) Inrush current suppression device and power supply device
US5812120A (en) BNC/D-sub signal auto-selection circuit
JPH0651729A (en) Automatic switching circuit for input signal path
JPH02122730A (en) Signal line terminating system
JPS62299138A (en) Electric connecting condition selection system for data interface device
JP2551666B2 (en) Clock supply switching circuit
CN115942406A (en) Electronic equipment and mode switching method
JP3306701B2 (en) Output relay multiplex operation detection circuit
JPH0898433A (en) Switching apparatus for feeding system for optical cable
JP2000350360A (en) Power supply control system
KR200241663Y1 (en) Input signal automatic selection device of reflex device
JPS61264870A (en) Synchronization changing device in video converter
KR0166636B1 (en) Reset device and its method
JPH04132473A (en) Video signal changeover device
JP3306897B2 (en) Network control device and connection destination identification method
JP2887511B2 (en) Switching circuit of multi-pole switch
JPH05111139A (en) Relay testing device
JPS62177601A (en) Input/output circuit for signal processor
JPH06167362A (en) Master-slave switching type measuring instrument
JPH08288979A (en) Interface changeover method and its device for data transfer device
JPS6318846A (en) Communication controller
JP2000347707A (en) Method for transmitting signal for dual system and single system coexisting system
JPH0993277A (en) Information receptacle