JPS62225044A - Termination equipment of transmission line - Google Patents

Termination equipment of transmission line

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Publication number
JPS62225044A
JPS62225044A JP7174286A JP7174286A JPS62225044A JP S62225044 A JPS62225044 A JP S62225044A JP 7174286 A JP7174286 A JP 7174286A JP 7174286 A JP7174286 A JP 7174286A JP S62225044 A JPS62225044 A JP S62225044A
Authority
JP
Japan
Prior art keywords
signal
line
power supply
turned
devices
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
JP7174286A
Other languages
Japanese (ja)
Inventor
Noritaka Egami
江上 憲位
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP7174286A priority Critical patent/JPS62225044A/en
Publication of JPS62225044A publication Critical patent/JPS62225044A/en
Pending legal-status Critical Current

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  • Small-Scale Networks (AREA)

Abstract

PURPOSE:To attain communication between other equipments even when the power supply of one equipment connected to a common transmission is turned off by not connecting a cathode of a diode to a power line but connecting it to the positive pole of a battery. CONSTITUTION:Cathodes of the 2nd diodes 15,25 and 35 of equipments l,2,3 are connected to positive poles of batteries l01,201,301. When the power supply 11 of the equipment l is turned off, the signal line 4 in the equipment l is connected to an output terminal of a driver 13 and an input terminal of a receiver 14 and a circuit from its connecting point to a return 5 has a high impedance. Since the peak value of the signal on the signal line 4 is clamped to a voltage of a battery 101 independently of on/off of the power supply 11, even when the power supply 11 is turned off, the communication between the equipments 2 and 3 is attained. That is, even when the power supply of an equipment is turned off, the communication is attained with other equipment whose power is turned on.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は直流パルス信号を伝送する伝送路の終端方式
に関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for terminating a transmission line for transmitting DC pulse signals.

〔従来の技術〕[Conventional technology]

第3図は従来の装置を示すブロック図である。 FIG. 3 is a block diagram showing a conventional device.

図においてfi+ 、 +21 、 +31は互に信号
を伝送することがある各装置、(11) 、 (21)
 、 (31)はそれぞれ装fit (1)。
In the figure, fi+, +21, and +31 are devices that may transmit signals to each other, (11), (21)
, (31) are respectively fitted (1).

(2)、(3)の直流′電源で、図に示す例では共に5
v直流電源であるとする。(12) 、 (22) 、
 (32)はそれぞれ装置11)、(2)、(3)内の
主要な回路でろって5源(11)。
In the example shown in the figure, both DC' power supplies (2) and (3) are 5
v Assume that it is a DC power supply. (12), (22),
(32) are the main circuits in the devices 11), (2), and (3), respectively, which are the five sources (11).

(21) 、 (31)に対する負荷装置となるので仮
に負荷装置という。(13) 、 (23) 、 (3
3)はそれぞれ信号送信用のドライバ、(14) 、 
(24) 、 (34)はそれぞれ信号受信用のレシー
バ、(15) 、 (25) 、 (35) 、 (1
6) 、 (26) 、 (36)はそれぞれクランパ
ダイオードで、この明細書では仮に(15) 。
Since it serves as a load device for (21) and (31), it is temporarily called a load device. (13), (23), (3
3) are drivers for signal transmission, (14),
(24), (34) are receivers for signal reception, (15), (25), (35), (1
6), (26), and (36) are clamper diodes, which are assumed to be (15) in this specification.

(25) 、 (35)を第2のダイオード、(16)
 、 (26) 、 (36)を第1のダイオードとい
う。(4)は共通の信号線、(5)は共通の帰線で、信
号線(4)と帰線[51−1対にして仮に共通の伝送路
という。また(17) 、 (27) 、 (37)は
5V電源線、(1s) 、 (28) 、 (3B)は
接地線である。
(25), (35) as the second diode, (16)
, (26), and (36) are called the first diode. (4) is a common signal line, (5) is a common return line, and the signal line (4) and the return line [51-1 pair are temporarily called a common transmission line. Further, (17), (27), and (37) are 5V power supply lines, and (1s), (28), and (3B) are ground lines.

第3図に示す例では、伝送路の終端回路は信号線(4)
と帰線15)との間に接続される第1のダイオードと信
号線(4)から第2のダイオードと電源とを経て帰線(
5)に到る回路との並列接続から構成される。
In the example shown in Figure 3, the termination circuit of the transmission line is the signal line (4).
and the return wire 15) and the signal line (4) connected between the return wire 15) and the return wire (
It consists of parallel connections with the circuits listed in 5).

次に動作について説明する。たとえば装置(2)から装
置(3)へ信号を送る場合、ドライバ(23) ’に経
て信号@f41上に信号を送出し、この信号がレシーバ
(34)を経て受信される。この信号は論理「1」が5
V近辺であり、論理「0」がOvであるディジタル信号
であるとする。このディジタル信号は信号#t41の各
装置への接続点において反射するので波形が乱れる。こ
の波形の乱れを防止するため信号&lI41と各装置と
の接続点には終端回路が接続されている。第3図に示す
例では、その終端回路は先に説明したように第1のダイ
オード(16) 、 (26) 。
Next, the operation will be explained. For example, when sending a signal from the device (2) to the device (3), the signal is sent on the signal @f41 via the driver (23)', and this signal is received via the receiver (34). This signal has a logic “1” of 5
Suppose that it is a digital signal in the vicinity of V, and the logic "0" is Ov. Since this digital signal is reflected at the connection point of signal #t41 to each device, the waveform is disturbed. In order to prevent this waveform from being disturbed, a termination circuit is connected to the connection point between the signal &lI41 and each device. In the example shown in FIG. 3, the termination circuit is the first diode (16), (26) as explained above.

(36)と第2のダイオード(15) 、 (25) 
、 (35)から構成される。したがって信号線(4)
上の信号がオーバシュートシて5vを超すとたとえば第
2のダイオード(35)がオン状態となって信号のピー
ク値は5Vにクランプされ、信号線(4)上の信号がア
ンダシュートしてOv以下になるとたとえば第1のダイ
オード(36)がオン状態となって信号の論理「0」の
′電位(この明細書では仮に無信号時の電位という)t
−OVにクランプする。
(36) and the second diode (15), (25)
, (35). Therefore signal line (4)
When the above signal overshoots and exceeds 5V, for example, the second diode (35) turns on and the peak value of the signal is clamped to 5V, and the signal on the signal line (4) undershoots and becomes Ov. For example, when the first diode (36) is turned on, the potential of the signal logic "0" (temporarily referred to as the potential at no signal in this specification) t
-Clamp to OV.

〔発明が解決しようとする間地点〕[Intermediate point that the invention attempts to solve]

従来の終端装置は以上のように構成されているので、共
通の伝送路に接続される装置のうちの1つの装置がその
°tlL#′!i−オフ状態にすると、他の装置におい
ても共通の伝送路を使用することができなくなるという
問題点がめった。
Since the conventional terminating device is configured as described above, one of the devices connected to the common transmission path is connected to that °tlL#'! When the i-off state is set, a problem arises in that the common transmission path cannot be used even in other devices.

第4図は第3図の゛電源(11)がオフ状態となったと
き、信号線(41と帰! +51とから見た装置(1)
の等価回路を示す接続図で、図において第3図と同一符
号は同一部分を示す。多くの場合、電源(11)は交流
電源全整流して得られる直流電源であるから、その整流
回路には相当大きなコンデンサが挿入されており、かつ
負荷装置(12)内における電源*17)と接地線(1
8)間にも低抵抗とコンデンサが接続されているので、
電源線(17)と接地線(18)間の抵抗は数オーム程
度、静電容量は数十μF程度であ)、これは第2のダイ
オード(15)を介して信号線(4)上の信号を短絡す
る程度のインピーダンスとなる。
Figure 4 shows the device (1) seen from the signal line (41 and +51) when the power supply (11) in Figure 3 is turned off.
3 is a connection diagram showing an equivalent circuit of FIG. 3, in which the same reference numerals as in FIG. In many cases, the power source (11) is a DC power source obtained by fully rectifying the AC power source, so a fairly large capacitor is inserted in the rectifier circuit, and the power source in the load device (12) *17) Ground wire (1
8) Since a low resistance and a capacitor are also connected in between,
The resistance between the power line (17) and the ground line (18) is about several ohms, and the capacitance is about several tens of μF), and this is connected to the signal line (4) via the second diode (15). The impedance is high enough to short-circuit the signal.

したがって、装置(1)内で電源(11)をオフ状態に
すると、ドライバ(23)から信号線(4)に送出され
た信号は装置(1)内で短絡され、装置(3)のレジ−
/に34)によっては受信できなくなる。
Therefore, when the power supply (11) is turned off in the device (1), the signal sent from the driver (23) to the signal line (4) is short-circuited in the device (1), and the register in the device (3) is short-circuited.
/34), it becomes impossible to receive.

この発明は上記のような問題点を解決するためになされ
たもので、共通の伝送路に接続される1つの装置がその
電源をオフ状態にした場合でも、他の装置間では通信が
可能なようにすることを目的としている。
This invention was made to solve the above-mentioned problems, and even if one device connected to a common transmission path is turned off, communication is possible between other devices. The purpose is to do so.

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

この発明では第2のダイオード(15) 、 (25)
 、 (35)のカソードを電源線(17) 、 (2
7) 、 (37) K接続することな(5Vの電池の
正極に接続するようにした。
In this invention, the second diodes (15), (25)
, (35) to the power line (17), (2
7), (37) Do not connect K (connected to the positive terminal of a 5V battery).

〔作用〕[Effect]

電源をオフ状態にした装置によって信号が短絡されると
いうことがないので、其他の装置における通信は可能と
なる。
Communication in other devices is possible because the signal is not shorted by the device that is powered off.

〔実施例〕〔Example〕

以下この発明の実施例を図面について説明する。 Embodiments of the present invention will be described below with reference to the drawings.

第1図はこの発明の一実施例を示すブロック図で、図に
おいて第3図と同一符号は同−又は相当部分を示し、(
101)、(201)、(301)はそれぞれ電池であ
る。図に示す例では電源線(17) 、 (27) 、
 (37)の電圧5VK対応して電池(101)、(2
01)、(301)の電圧は5vであるとする。
FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, the same reference numerals as in FIG. 3 indicate the same or corresponding parts, and (
101), (201), and (301) are batteries, respectively. In the example shown in the figure, the power lines (17), (27),
Battery (101), (2) corresponds to voltage 5VK of (37).
01) and (301) are 5V.

以下動作について説明する。装置(1)の電源(11)
がオン状態のときは第1図に示す回路の動作は第3図に
示す回路の動作と同一であって、ただ、信号線(4)上
の信号のピーク値が電源線(17)上の電圧にクランプ
されるかわシに電池(101)の電圧にクランプされる
The operation will be explained below. Power supply (11) for device (1)
is on, the operation of the circuit shown in Figure 1 is the same as that of the circuit shown in Figure 3, except that the peak value of the signal on the signal line (4) is on the power line (17). Instead of being clamped to the voltage, it is clamped to the voltage of the battery (101).

第2図は第1図の電源(11)がオフ状態となったとき
の信号線(4)と帰線(5)間の等何回路を示す接続図
で、信号線(4)は装置(1)内ではドライバ(13)
の出力端子とレシーバ(14)の入力端子に接続されて
いるが、これらの接続点から帰線(5)に到る回路は高
インピーダンスになっているので、これを省略して考え
ると、信号線(4)上の信号のピーク値が電池(101
)の′電圧5vにクランプされることはvK礁11)の
オンオフには関係ない。すなわち電源(11)がオフ状
態にありても装fffi +21と装置(3)の間の通
信は可能である。
Figure 2 is a connection diagram showing the circuit between the signal line (4) and return line (5) when the power supply (11) in Figure 1 is turned off, and the signal line (4) is connected to the device ( 1) Driver (13)
is connected to the output terminal of the receiver (14) and the input terminal of the receiver (14), but since the circuit from these connection points to the return line (5) has a high impedance, if we omit this, the signal The peak value of the signal on line (4) is the battery (101
) is clamped to the voltage 5V, which has no relation to whether vK reef 11) is turned on or off. That is, communication between the device fffi +21 and the device (3) is possible even when the power source (11) is off.

なお、上記実施例では、終端回路としてクランパダイオ
ードを用いる場合について示したが、終端回路が抵抗で
ある場合についても、同様の効果を生ずる。
In the above embodiment, a case is shown in which a clamper diode is used as the termination circuit, but the same effect is produced even when the termination circuit is a resistor.

また、第1図に示す例では帰線(5)に対し1本の信号
線(4)が設けられる場合を示したが複数の信号線が設
けられる場合、各信号線の終端装置としてこの発明全適
用することができる。
In the example shown in FIG. 1, one signal line (4) is provided for the return line (5), but if a plurality of signal lines are provided, the present invention can be used as a termination device for each signal line. All can be applied.

〔発明の効果〕〔Effect of the invention〕

以上のようにこの発明によれば、各装置内において信号
線上のピーク電圧全電源線上の電圧ではなくて電池電圧
にクランプするようにしたので、共通の伝送路に接続さ
れる装置において電源をオフ状態にした場合も、電源が
オン状態にある装置間の通信を可能にするという効果が
ある。
As described above, according to the present invention, in each device, the peak voltage on the signal line is clamped to the battery voltage instead of the voltage on the entire power supply line, so the power is turned off in the devices connected to the common transmission line. Even when it is turned on, it has the effect of enabling communication between devices whose power is on.

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

第1図はこの発明の一実施例を示すブロック図、第2図
f′i第1図において電源がオフ状態となった場合、信
号線と帰線とから見た装置の等何回路を示す接続図、第
3図は従来の装*’を示すブロック図、第4図は第3図
の電源がオフ状態となった場合、信号線と帰線とから見
た装置の等何回路を示す接続図。 +11 、 +21 、 +31はそれぞれ装置、(4
)は信号線、(5)は帰線、(11) 、 (ン1) 
、 (31)はそれぞれ電源、(12) 、 (22)
 。 (32)はそれぞれ負荷装置、(13) 、 (23)
 、 (33)はそれぞれドライバ、(14) 、 (
24) 、 (34)はそれぞれレシーバ、(15) 
、 (25) 、 (35)はそれぞれ第2のダイオー
ド、(16) 。 (26) 、 (36)はそれぞれ第1のダイオード、
(17) 、 (27) 。 (37)はそれぞれ電源線、(18) 、 (28) 
、 (38)はそれぞれ接地線、(101)、(201
)、(301)はそれぞれ電池。 尚、各図中同一符号は同−又は相当部分を示す。
Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 f'i shows the circuitry of the device as seen from the signal line and the return line when the power is turned off in Fig. 1. Connection diagram. Figure 3 is a block diagram showing the conventional equipment. Figure 4 shows the circuitry of the equipment as seen from the signal line and return line when the power supply in Figure 3 is turned off. Connection diagram. +11, +21, +31 are the device, (4
) is the signal line, (5) is the return line, (11), (n1)
, (31) are the power supply, (12) and (22) respectively.
. (32) are load devices, (13) and (23) respectively.
, (33) are drivers, (14) , (
24) and (34) are the receiver, (15) respectively.
, (25) and (35) are the second diodes and (16), respectively. (26) and (36) are the first diodes, respectively;
(17), (27). (37) are power lines, (18) and (28) respectively.
, (38) are the ground wires, (101), (201) respectively.
) and (301) are batteries, respectively. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (2)

【特許請求の範囲】[Claims] (1)直流電位が常に一定に保たれる帰線と、この帰線
の電位に対し電位の変化する信号を伝送する信号線とか
ら構成される共通の伝送路に接続される複数の装置が、
各装置ごとに直流電源を持ち、当該装置内の直流電源を
用いて発生する直流パルス信号を上記共通の伝送路に送
出することによって装置相互間の通信を行う場合に、上
記共通の伝送路を上記複数の装置の各装置内においてそ
れぞれ終端する伝送路の終端装置において、 上記各装置内において上記信号線と上記共通の帰線間に
接続される終端回路、 上記各装置内において上記終端回路に並列に接続されダ
イオードと電池の直列接続によって構成されるクランパ
回路であって、上記ダイオードと上記電池の極性は上記
直流パルス信号のピーク値を上記電池の電圧にクランプ
する極性で接続されるクランパ回路、 を備えたことを特徴とする伝送路の終端装置。
(1) Multiple devices connected to a common transmission path consisting of a return line whose DC potential is always kept constant and a signal line that transmits a signal whose potential changes with respect to the potential of this return line. ,
When each device has a DC power supply and the devices communicate with each other by sending a DC pulse signal generated using the DC power supply within the device to the common transmission path, the common transmission path is used. A terminating device for a transmission line that terminates in each of the plurality of devices, a terminating circuit connected between the signal line and the common return line in each of the devices, a terminating circuit connected to the terminating circuit in each of the devices, A clamper circuit configured by a series connection of a diode and a battery connected in parallel, wherein the polarity of the diode and the battery is such that the peak value of the DC pulse signal is clamped to the voltage of the battery. A transmission line termination device comprising:
(2)終端回路は、無信号時の信号線上の電圧を共通の
帰線上の電圧にクランプする極性で上記信号線と上記共
通の帰線間に接続されるダイオードを備えたことを特徴
とする特許請求の範囲第1項記載の伝送路の終端装置。
(2) The termination circuit is characterized by comprising a diode connected between the signal line and the common return line with a polarity that clamps the voltage on the signal line when there is no signal to the voltage on the common return line. A transmission line termination device according to claim 1.
JP7174286A 1986-03-26 1986-03-26 Termination equipment of transmission line Pending JPS62225044A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7174286A JPS62225044A (en) 1986-03-26 1986-03-26 Termination equipment of transmission line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7174286A JPS62225044A (en) 1986-03-26 1986-03-26 Termination equipment of transmission line

Publications (1)

Publication Number Publication Date
JPS62225044A true JPS62225044A (en) 1987-10-03

Family

ID=13469280

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7174286A Pending JPS62225044A (en) 1986-03-26 1986-03-26 Termination equipment of transmission line

Country Status (1)

Country Link
JP (1) JPS62225044A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7154954B1 (en) 2000-07-18 2006-12-26 Honda Giken Kogyo Kabushiki Kaisha Communication system
US7863961B2 (en) 2004-09-30 2011-01-04 Yazaki Corporation Vehicle communication system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7154954B1 (en) 2000-07-18 2006-12-26 Honda Giken Kogyo Kabushiki Kaisha Communication system
US7863961B2 (en) 2004-09-30 2011-01-04 Yazaki Corporation Vehicle communication system

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