JPH0326698Y2 - - Google Patents
Info
- Publication number
- JPH0326698Y2 JPH0326698Y2 JP5836586U JP5836586U JPH0326698Y2 JP H0326698 Y2 JPH0326698 Y2 JP H0326698Y2 JP 5836586 U JP5836586 U JP 5836586U JP 5836586 U JP5836586 U JP 5836586U JP H0326698 Y2 JPH0326698 Y2 JP H0326698Y2
- Authority
- JP
- Japan
- Prior art keywords
- photocoupler
- signal
- variable resistance
- circuit
- turned
- 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.)
- Expired
Links
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 238000010257 thawing Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Bidirectional Digital Transmission (AREA)
Description
【考案の詳細な説明】
［産業上の利用分野］
本考案は、２つの機器間において、一方から他
方へ信号を順転送すると同時に他方から一方へ信
号を逆転送するようにした２機器間の信号転送回
路に関するものである。[Detailed description of the invention] [Industrial application field] The present invention is a method for transmitting signals between two devices, in which a signal is forwardly transferred from one device to the other, and at the same time, a signal is transferred backwards from the other device to the other device. This invention relates to signal transfer circuits.
［従来の技術］
２機器間の信号転送回路には、例えば空気調和
機の室内機と室外機の間における信号転送回路が
ある。従来、この種の信号転送回路は第３図に示
すように構成されていた。この図において、１は
室内機、２は室外機で、これらの室内機１、室外
機２内には、それぞれ制御装置としての第１、第
２マイコン３，４が設けられている。前記第１マ
イコン３の出力端子O1から出力する運転データ
で第１フオトカプラ５をオン、オフし、第１信号
線６を介して室外機２内のスイツチング用トラン
ジスタ７をオフ、オンし、第２マイコン４の入力
端子I2へ運転データを転送していた。また室外機
２内の第２マイコン４の出力端子O2から出力す
る除霜データでスイツチング用トランジスタ８を
オン、オフし、第２信号線９を介して室内機１内
の第２フオトカプラ１０をオフ、オンし、第１マ
イコン３の入力端子I1へ除霜データを逆転送して
いた。１１は接地線である。[Prior Art] A signal transfer circuit between two devices includes, for example, a signal transfer circuit between an indoor unit and an outdoor unit of an air conditioner. Conventionally, this type of signal transfer circuit has been configured as shown in FIG. In this figure, 1 is an indoor unit, 2 is an outdoor unit, and inside these indoor unit 1 and outdoor unit 2, first and second microcomputers 3 and 4 are provided as control devices, respectively. The operation data outputted from the output terminal O1 of the first microcomputer 3 turns on and off the first photocoupler 5, and turns off and on the switching transistor 7 in the outdoor unit 2 via the first signal line 6. 2 Operation data was being transferred to input terminal I2 of microcomputer 4. In addition, the defrosting data output from the output terminal O2 of the second microcomputer 4 in the outdoor unit 2 turns on and off the switching transistor 8, and connects the second photocoupler 10 in the indoor unit 1 via the second signal line 9. It was turned off and on, and the defrosting data was reversely transferred to the input terminal I1 of the first microcomputer 3. 11 is a grounding wire.
［考案が解決しようとする問題点］
上述のように、従来の信号転送回路によつて室
内機と室外機の間で順転送と同時に逆転送を行う
場合、機器間を接続する信号線は接地線を含めて
３本必要としていた。このため接続作業が面倒で
あるとともにコストアツプとなり、さらにコネク
タのピン数が増加して接続の信頼性がそこなわれ
るという問題点があつた。[Problems to be solved by the invention] As mentioned above, when forward transfer and reverse transfer are performed between the indoor unit and the outdoor unit using the conventional signal transfer circuit, the signal line connecting the devices must be grounded. I needed three wires including the wire. For this reason, there were problems in that the connection work was troublesome, the cost increased, and the number of pins of the connector increased, reducing the reliability of the connection.
本考案は上述の問題点に鑑みなされたもので、
接地線を含めた２本の信号線だけで２つの機器間
における順転送と同時に逆転送を行うことができ
るようにした信号転送回路を得、もつて２つの機
器間の接続作業を容易にするとともにコストダウ
ンを図り、接続の信頼性を向上せしめることを目
的とするものである。 This idea was created in view of the above-mentioned problems.
A signal transfer circuit is provided that allows forward and reverse transfer between two devices using only two signal lines including a grounding wire, thereby facilitating connection work between two devices. The aim is to reduce costs and improve connection reliability.
［問題点を解決するための手段］
本考案による２つの機器間の信号転送回路は、
一方の機器に変換効率の高い第１フオトカプラと
変換効率の低い第２フオトカプラを設け、前記第
１フオトカプラの受光素子と前記第２フオトカプ
ラの発光素子の直列回路の両端を信号線と接地線
とを介して他方の機器に接続し、この他方の機器
において前記信号線を可変抵抗回路を介して直流
電源に接続し、前記接地線を接地してなり、前記
可変抵抗回路を、直列接続された２つの抵抗と、
この２つの抵抗の一方に並列に接続されたスイツ
チング素子とで構成し、前記一方の機器内の出力
信号で前記第１フオトカプラをオン、オフするこ
とによつて前記信号線を介して前記他方の機器へ
信号の順転送を行い、前記第１フオトカプラのオ
ン時における前記他方の機器内の出力信号で前記
スイツチング素子をオン、オフして前記可変抵抗
回路の抵抗値を可変し、前記第２フオトカプラを
オン、オフすることによつて前記一方の機器へ信
号の逆転送を行うようにしたことを特徴とするも
のである。[Means for solving the problem] The signal transfer circuit between two devices according to the present invention has the following features:
One device is provided with a first photocoupler with high conversion efficiency and a second photocoupler with low conversion efficiency, and a signal line and a ground line are connected to both ends of the series circuit of the light receiving element of the first photocoupler and the light emitting element of the second photocoupler. in which the signal line is connected to a DC power source via a variable resistance circuit, and the ground line is grounded, and the variable resistance circuit is connected to two connected in series. two resistances,
and a switching element connected in parallel to one of the two resistors, and by turning on and off the first photocoupler with an output signal in the one device, the other device is connected via the signal line. The signal is sequentially transferred to the device, and the resistance value of the variable resistance circuit is varied by turning on and off the switching element using the output signal in the other device when the first photocoupler is turned on, and the resistance value of the variable resistance circuit is varied. The device is characterized in that the signal is reversely transferred to the one device by turning on and off the device.
［作用］
一方の機器内の出力信号S1がレベル変化（例え
ばＬ→Ｈ）することによつて高い変換効率の第１
フオトカプラがオンしたとすると、信号線がＨレ
ベルからＬレベルに変化する。また、前記出力信
号S1のレベルが戻る（例えばＨ→Ｌ）と第１フオ
トカプラがオフとなるので信号線はＨレベルに戻
る。すなわち信号線によつて一方の機器内の出力
信号S1のレベル変化が他方の機器へ順転送され
る。この順転送時において、低い変換効率の第２
フオトカプラは発光素子に微小電流が流れている
だけなのでオンに至つていない。しかし、第１フ
オトカプラのオン時において、他方の機器内の出
力信号S2がレベル変化（例えばＨ→Ｌ）すること
によつて、可変抵抗回路のスイツチング素子がオ
ンしてもその抵抗値が減少すると、信号線を介し
て第２フオトカプラの発光素子を流れる電流が増
加しオンする。また、出力信号S2のレベルが戻る
（Ｌ→Ｈ）と可変抵抗回路のスイツチング素子が
オフしてその抵抗値が元に戻つて信号線を流れる
電流が微小電流に戻り第２フオトカプラがオフす
る。すなわち、第１フオトカプラのオン時におい
て他方の機器内の出力信号S2のレベル変化が信号
線を流れる電流の増減をもたらし、第２フオトカ
プラをオン、オフするので他方の機器の出力信号
S2のレベル変化が第２フオトカプラを介して一方
の機器へ逆転送される。したがつて、接地線を含
めて２本の信号線で２つの機器間における順転送
と逆転送とを同時に行うことができる。[Function] By changing the level of the output signal S1 in one device (for example, from L to H), the first signal with high conversion efficiency is
When the photocoupler is turned on, the signal line changes from H level to L level. Further, when the level of the output signal S1 returns (for example, from H to L), the first photocoupler is turned off, and the signal line returns to the H level. That is, the level change of the output signal S1 in one device is sequentially transferred to the other device by the signal line. During this forward transfer, the second
The photocoupler is not turned on because only a minute current flows through the light emitting element. However, when the first photocoupler is turned on, the level of the output signal S2 in the other device changes (from H to L, for example), so even if the switching element of the variable resistance circuit is turned on, its resistance value decreases. Then, the current flowing through the light emitting element of the second photocoupler increases through the signal line, turning it on. Furthermore, when the level of the output signal S 2 returns (from L to H), the switching element of the variable resistance circuit turns off, its resistance value returns to its original value, and the current flowing through the signal line returns to a minute current, turning off the second photocoupler. . In other words, when the first photocoupler is turned on, a change in the level of the output signal S2 in the other device causes an increase or decrease in the current flowing through the signal line, which turns the second photocoupler on or off, thereby changing the output signal of the other device.
The level change in S 2 is transferred back to one device via a second photocoupler. Therefore, forward transfer and reverse transfer between two devices can be performed simultaneously using two signal lines including the ground line.
［実施例］
第１図は本考案の一実施例を示すもので、この
図において、２１，２２はそれぞれ一方の機器、
他方の機器としての空気調和機の室内機、室外機
である。前記室内機２１内には制御装置としての
第１マイコン２３、高い変換効率の第１フオトカ
プラ２４および低い変換効率の第２フオトカプラ
２５が設けられている。前記第１マイコン２３の
出力端子O1はインバータ２６を介して前記第１
フオトカプラ２４の発光ダイオード２７のカソー
ドに接続され、この発光ダイオード２７のアノー
ドは抵抗２８を介して直流電源Vccに接続されて
いる。前記第１フオトカプラ２４のフオトトラン
ジスタ２９のコレクタは非接地側の接続端子３０
を経、信号線３１を介して前記室外機２２の非接
地側の接続端子３２に接続され、エミツタは前記
第２フオトカプラ２５の発光ダイオード３３、接
地側の接続端子３４を経、接地線３５を介して前
記室外機２２の接地側の接続端子３６に接続さ
れ、この接続端子３６は室外機２２内において接
地されている。[Embodiment] FIG. 1 shows an embodiment of the present invention. In this figure, 21 and 22 each indicate one device,
The other devices are an indoor unit and an outdoor unit of an air conditioner. Inside the indoor unit 21, a first microcomputer 23 as a control device, a first photocoupler 24 with high conversion efficiency, and a second photocoupler 25 with low conversion efficiency are provided. The output terminal O1 of the first microcomputer 23 is connected to the first microcomputer 23 via the inverter 26.
It is connected to the cathode of a light emitting diode 27 of the photocoupler 24, and the anode of this light emitting diode 27 is connected to the DC power supply Vcc via a resistor 28. The collector of the phototransistor 29 of the first photocoupler 24 is connected to the connection terminal 30 on the non-grounded side.
The emitter is connected to the non-grounding side connection terminal 32 of the outdoor unit 22 via the signal line 31, and the emitter is connected to the grounding line 35 via the light emitting diode 33 of the second photocoupler 25 and the grounding side connection terminal 34. The connecting terminal 36 is connected to the ground side connecting terminal 36 of the outdoor unit 22 through the connecting terminal 36, and this connecting terminal 36 is grounded inside the outdoor unit 22.
前記第２フオトカプラ２５のフオトトランジス
タ３７のコレクタは前記第１マイコン２３の入力
端子I1に接続されるとともに抵抗３８を介して直
流電源Vccに接続され、エミツタは接地されてい
る。前記室外機２２内には制御装置としての第２
マイコン３９が設けられ、この第２マイコン３９
の入力端子I2は前記非接地側の接続端子３２に接
続され、この接続端子３２は可変抵抗回路４０を
介して直流電源Vccに接続されている。前記可変
抵抗回路４０は直列接続された２つの抵抗４１，
４２と一方の抵抗４１にエミツタ・コレクタ間が
並列接続されたスイツチング用pnp型トランジス
タ４３とからなり、このトランジスタ４３のベー
スは、抵抗４４を介して前記第２マイコン３９の
出力端子O2に接続され、さらに抵抗４５を介し
て直流電源Vccに接続されている。 The collector of the phototransistor 37 of the second photocoupler 25 is connected to the input terminal I1 of the first microcomputer 23 and also to the DC power supply Vcc via a resistor 38, and its emitter is grounded. A second controller as a control device is installed in the outdoor unit 22.
A microcomputer 39 is provided, and this second microcomputer 39
The input terminal I 2 of is connected to the connection terminal 32 on the non-grounded side, and this connection terminal 32 is connected to the DC power supply Vcc via a variable resistance circuit 40 . The variable resistance circuit 40 includes two resistors 41 connected in series,
42 and a switching PNP transistor 43 whose emitter and collector are connected in parallel to one resistor 41, and the base of this transistor 43 is connected to the output terminal O2 of the second microcomputer 39 via a resistor 44. It is further connected to the DC power supply Vcc via a resistor 45.
つぎに、前記実施例の作用を第２図を併用して
説明する。 Next, the operation of the above embodiment will be explained with reference to FIG. 2.
室内機２１内の第１マイコン２３の出力端子
O1から第２図ａに示すような運転データ信号が
出力したとする。この出力信号は第１ビツトはス
タート信号を、第２、第３ビツトは冷暖房信号
（例えば「10」は冷房信号）を、第４ビツトから
第９ビツトまでは圧縮機の回転数制御用の周波数
信号をそれぞれ表わす。いま、出力端子O1の出
力信号がＬレベルからＨレベルに変化すると第１
フオトカプラ２４がオンし、信号線３１を介して
室外機２２の第２マイコン３９の入力端子I2がＨ
レベルからＬレベルに変化する。そして、出力端
子O1の出力信号がＬレベルに戻ると、第１フオ
トカプラ２４がオフして室外機２２の第２マイコ
ン３９の入力端子I2がＨレベルに戻る。したがつ
て室外機２２の第２マイコン３９の入力端子I2に
は第２図ｃに示すような同図ａの信号を反転した
波形の運転データ信号がシリアル転送される（順
転送）。第１フオトカプラ２４がオンしていると
き、第２フオトカプラ２５の発光ダイオード３３
に微小電流が流れるがこの第２フオトカプラ２５
は低い変換効率であるためオンしない。 Output terminal of the first microcomputer 23 in the indoor unit 21
Assume that an operating data signal as shown in FIG. 2a is output from O1. The first bit of this output signal is a start signal, the second and third bits are a heating/cooling signal (for example, "10" is a cooling signal), and the fourth to ninth bits are a frequency for controlling the rotation speed of the compressor. Each represents a signal. Now, when the output signal of output terminal O1 changes from L level to H level, the first
The photocoupler 24 is turned on, and the input terminal I2 of the second microcomputer 39 of the outdoor unit 22 becomes H via the signal line 31.
Changes from level to L level. Then, when the output signal of the output terminal O1 returns to the L level, the first photocoupler 24 is turned off and the input terminal I2 of the second microcomputer 39 of the outdoor unit 22 returns to the H level. Therefore, to the input terminal I2 of the second microcomputer 39 of the outdoor unit 22, an operating data signal having a waveform obtained by inverting the signal shown in FIG. 2a as shown in FIG. 2c is serially transferred (sequential transfer). When the first photocoupler 24 is on, the light emitting diode 33 of the second photocoupler 25
A minute current flows through this second photocoupler 25.
does not turn on due to low conversion efficiency.
上述の室内機２１側から室外機２２側へ運転デ
ータ信号が順転送されているときにおいて、同時
に室外機２２側の第２マイコン３９の出力端子
O2から第２図ｂに示すような除霜データ信号
（ＨレベルからＬレベルに変化する信号）が出力
すると、可変抵抗回路４０のトランジスタ４３が
オンしてその抵抗値が減少する。このため第１フ
オトカプラ２４がオンしているときにおいてのみ
信号線３１を介して第２フオトカプラ２５の発光
ダイオード３３を流れる電流が増加し、第２フオ
トカプラ２５をオンし、室内機２１側の第１マイ
コン２３の入力端子I1のレベルがＨレベルからＬ
レベルに変化する。したがつて室内機２１の第１
マイコン２３の入力端子I1には第２図ｃに示すよ
うなデータ信号がシリアル転送され、室内機２１
側の第１マイコン２３は室外機２２側から除霜デ
ータが転送されたことを判別する。 When the operation data signal is sequentially transferred from the indoor unit 21 side to the outdoor unit 22 side, the output terminal of the second microcomputer 39 on the outdoor unit 22 side is simultaneously
When the defrosting data signal (signal changing from H level to L level) as shown in FIG. 2B is output from O2 , the transistor 43 of the variable resistance circuit 40 is turned on and its resistance value decreases. Therefore, only when the first photocoupler 24 is on, the current flowing through the light emitting diode 33 of the second photocoupler 25 via the signal line 31 increases, turning on the second photocoupler 25, and turning on the first photocoupler 24 on the indoor unit 21 side. The level of the input terminal I1 of the microcomputer 23 changes from H level to L level.
Change in level. Therefore, the first
A data signal as shown in FIG. 2c is serially transferred to the input terminal I1 of the microcomputer 23, and
The first microcomputer 23 on the side determines that the defrosting data has been transferred from the outdoor unit 22 side.
前記実施例では空気調和機の室内機と室外機と
の間の信号転送回路について説明したが、本考案
はこれに限るものでなく、２つの機器間における
信号転送回路に利用できる。 Although the above embodiment describes a signal transfer circuit between an indoor unit and an outdoor unit of an air conditioner, the present invention is not limited thereto, and can be applied to a signal transfer circuit between two devices.
［考案の効果］
本考案による２つの機器間の信号転送回路は、
上記のように、一方の機器に変換効率の高い第１
フオトカプラと変換効率の低い第２フオトカプラ
とを設け、他方の機器に直列接続された２つの抵
抗と、この２つの抵抗の一方に並列に接続された
スイツチング素子とからなる可変抵抗回路を設
け、両機器間を１本の信号線と１本の接地線とで
接続し、第１フオトカプラをオン、オフすること
によつて一方の機器から他方の機器へ信号の順転
送を行い、第１フオトカプラのオン時におけるス
イツチング素子のオン、オフで可変抵抗回路の抵
抗値を可変して第２フオトカプラをオン、オフす
ることによつて他方の機器から一方の機器へ信号
の逆転送を行うように構成した。このため２つの
機器間を接続する信号線を、接地線を含めて３本
必要とした従来例と比べて１本少ない２本にする
ことができる。したがつて従来と比べて２つの機
器間の接続作業を容易にすることができるととも
にコストダウンを図ることができ、しかもコネク
タピンを減少できるので接続の信頼性を向上せし
めることができる。[Effect of the invention] The signal transfer circuit between two devices according to the invention has the following effects:
As mentioned above, one device has a first one with high conversion efficiency.
A photocoupler and a second photocoupler with low conversion efficiency are provided, and a variable resistance circuit consisting of two resistors connected in series to the other device and a switching element connected in parallel to one of these two resistors is provided. By connecting the devices with one signal line and one grounding wire, and turning the first photocoupler on and off, signals are sequentially transferred from one device to the other. The configuration is such that the resistance value of the variable resistance circuit is varied by turning on and off the switching element when it is on, and by turning on and off the second photocoupler, a signal is transferred from the other device to the one device. . Therefore, the number of signal lines connecting two devices can be reduced to two, one less than in the conventional example, which required three signal lines including a grounding line. Therefore, compared to the conventional method, it is possible to make the connection work between two devices easier and to reduce the cost.Moreover, since the number of connector pins can be reduced, the reliability of the connection can be improved.
第１図は本考案による２機器間の信号転送回路
の一実施例を示す回路図、第２図は本考案の作用
を説明する信号の波形図、第３図は従来例を示す
回路図である。
２１……室内機（一方の機器）、２２……室外
機（他方の機器）、２４……第１フオトカプラ、
２５……第２フオトカプラ、３１……信号線、３
５……接地線、４３……可変抵抗回路、Vcc……
直流電源。
Fig. 1 is a circuit diagram showing an embodiment of a signal transfer circuit between two devices according to the present invention, Fig. 2 is a signal waveform diagram explaining the operation of the present invention, and Fig. 3 is a circuit diagram showing a conventional example. be. 21... Indoor unit (one device), 22... Outdoor unit (other device), 24... First photocoupler,
25...Second photocoupler, 31...Signal line, 3
5...Grounding wire, 43...Variable resistance circuit, Vcc...
DC power supply.
Claims (1)
ラと変換効率の低い第２フオトカプラを設け、
前記第１フオトカプラの受光素子と前記第２フ
オトカプラの発光素子の直列回路の両端を信号
線と接地線とを介して他方の機器に接続し、こ
の他方の機器において前記信号線を可変抵抗回
路を介して直流電源に接続し、前記接地線を接
地してなり、前記可変抵抗回路は、直列接続さ
れた２つの抵抗と、この２つの抵抗の一方に並
列に接続されたスイツチング素子とからなり、
前記一方の機器内の出力信号で前記第１フオト
カプラをオン、オフすることによつて前記信号
線を介して前記他方の機器へ信号の順転送を行
い、前記第１フオトカプラのオン時における前
記他方の機器内の出力信号で前記スイツチング
素子をオン、オフして前記可変抵抗回路の抵抗
値を可変し、前記第２フオトカプラをオン、オ
フすることによつて前記一方の機器へ信号の逆
転送を行うようにしたことを特徴とする２機器
間の信号転送回路。 (2) 一方の機器と他方の機器とは、それぞれ空気
調和機の室内機と室外機としてなる実用新案登
録請求の範囲第１項記載の２機器間の信号転送
回路。[Claims for Utility Model Registration] (1) One device is provided with a first photocoupler with high conversion efficiency and a second photocoupler with low conversion efficiency,
Both ends of the series circuit of the light receiving element of the first photocoupler and the light emitting element of the second photocoupler are connected to another device via a signal line and a ground line, and in this other device, the signal line is connected to a variable resistance circuit. The variable resistance circuit is connected to a DC power source through the variable resistance circuit, and the ground wire is grounded, and the variable resistance circuit includes two resistances connected in series and a switching element connected in parallel to one of the two resistances.
By turning on and off the first photocoupler with an output signal in the one device, a signal is sequentially transferred to the other device via the signal line, and when the first photocoupler is on, the second photocoupler is turned on and off. The switching element is turned on and off by an output signal in the device to vary the resistance value of the variable resistance circuit, and the second photocoupler is turned on and off to reversely transfer the signal to the one device. A signal transfer circuit between two devices, characterized in that: (2) One device and the other device are the signal transfer circuit between the two devices as set forth in claim 1, which is an indoor unit and an outdoor unit of an air conditioner, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5836586U JPH0326698Y2 (en) | 1986-04-18 | 1986-04-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5836586U JPH0326698Y2 (en) | 1986-04-18 | 1986-04-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62171232U JPS62171232U (en) | 1987-10-30 |
| JPH0326698Y2 true JPH0326698Y2 (en) | 1991-06-10 |
Family
ID=30888871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5836586U Expired JPH0326698Y2 (en) | 1986-04-18 | 1986-04-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0326698Y2 (en) |
-
1986
- 1986-04-18 JP JP5836586U patent/JPH0326698Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62171232U (en) | 1987-10-30 |
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