JPH0735472Y2 - Data transmission line power supply - Google Patents

Data transmission line power supply

Info

Publication number
JPH0735472Y2
JPH0735472Y2 JP1988112095U JP11209588U JPH0735472Y2 JP H0735472 Y2 JPH0735472 Y2 JP H0735472Y2 JP 1988112095 U JP1988112095 U JP 1988112095U JP 11209588 U JP11209588 U JP 11209588U JP H0735472 Y2 JPH0735472 Y2 JP H0735472Y2
Authority
JP
Japan
Prior art keywords
data transmission
power supply
transmission line
terminating
voltage
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 - Fee Related
Application number
JP1988112095U
Other languages
Japanese (ja)
Other versions
JPH0235549U (en
Inventor
央 橋本
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.)
Toshiba Corp
Original Assignee
Toshiba 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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP1988112095U priority Critical patent/JPH0735472Y2/en
Publication of JPH0235549U publication Critical patent/JPH0235549U/ja
Application granted granted Critical
Publication of JPH0735472Y2 publication Critical patent/JPH0735472Y2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Logic Circuits (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Dc Digital Transmission (AREA)

Description

【考案の詳細な説明】 [考案の目的] (産業上の利用分野) 本考案はデータ通信システムにおけるデータ伝送線の両
端に設けられた終端抵抗に、直流電圧を印加する電源装
置に関する。
DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to a power supply device for applying a DC voltage to terminal resistors provided at both ends of a data transmission line in a data communication system.

(従来の技術) データ通信システムにおけるデータ伝送線には、終端部
での反射波を防止するために、伝送線の両端に終端抵抗
が設けられており、この終端抵抗の両端に直流電圧を印
加している。
(Prior Art) A data transmission line in a data communication system is provided with terminating resistors at both ends of the transmission line in order to prevent reflected waves at the terminating end, and a DC voltage is applied to both ends of the terminating resistor. is doing.

第3図は、このような従来例を示すものであり、データ
伝送線1の両端には第1終端装置2,及び第2終端装置3
が設けられている。
FIG. 3 shows such a conventional example, in which the first terminating device 2 and the second terminating device 3 are provided at both ends of the data transmission line 1.
Is provided.

そして、データ伝送線1の伝送経路には端末装置4が数
箇所(図では2箇所)に接続されており、これら各装置
2,3,4の間ではデータ伝送線1を介して、データの伝送
が行なわれている。
The terminal device 4 is connected to several locations (two locations in the figure) on the transmission path of the data transmission line 1.
Data is transmitted through the data transmission line 1 between 2, 3, and 4.

また、両終端装置2,3に接続されるデータ伝送線1の終
端部分は、それぞれ抵抗R1を介して接地されており、更
に、抵抗R2を介して直流電源5に接続されている。
Further, the terminal portions of the data transmission line 1 connected to both the terminal devices 2 and 3 are grounded via a resistor R 1 and further connected to a DC power source 5 via a resistor R 2.

したがって、終端抵抗R1,R2に直流電圧Vccが印加される
ので、終端部での反射波の発生を防止することができ各
装置2,3,4間で正確なデータ伝送ができるようになる。
Therefore, since the DC voltage Vcc is applied to the terminating resistors R1 and R2, the generation of reflected waves at the terminating portions can be prevented, and accurate data transmission can be performed between the devices 2, 3 and 4.

(考案が解決しようとする課題) しかしながら、上記従来例では、両終端装置2,3のうち
いずれかの直流電源5が停電や機器の故障などの原因に
よって停止した場合には、データ伝送線1の終端抵抗R
1,R2に直流電圧を印加できなくなってしまう。このた
め、データ伝送線1の終端部にて発生する反射波を防止
することができなくなり、伝送データに波形ひずみを生
じてしまい、その結果、誤伝送を引き起こしてしまうと
いう課題があった。
(Problems to be solved by the invention) However, in the above-mentioned conventional example, when the DC power supply 5 of either of the two terminating devices 2 and 3 is stopped due to a power failure or a device failure, the data transmission line 1 Termination resistance R
DC voltage cannot be applied to 1 and R2. Therefore, it is impossible to prevent the reflected wave generated at the terminal end of the data transmission line 1, which causes waveform distortion in the transmission data, resulting in erroneous transmission.

この考案はこのような従来の課題を解決するためになさ
れたもので、その目的とするところは、終端装置におけ
る直流電源が停止した場合においても、他の直流電源か
らバックアップすることのできるデータ伝送線の電源装
置を提供することにある。
The present invention has been made to solve such a conventional problem, and an object thereof is to provide data transmission that can be backed up from another DC power supply even when the DC power supply in the termination device is stopped. It is to provide a power supply device of the wire.

[考案の構成] (課題を解決するための手段) 上記目的を達成するために、本考案は、データ伝送線の
両端に設けられた終端抵抗に、直流電圧を印加する装置
において、前記一方の終端抵抗における電圧印加点と前
記他方の終端抵抗における電圧印加点とを接続する電源
接続線と、前記電源接続線に常時直流電圧を供給する複
数個の直流電源と、を有することを特徴としている。
[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a device for applying a DC voltage to terminating resistors provided at both ends of a data transmission line. A power supply connection line connecting a voltage application point in a terminating resistor and a voltage application point in the other terminating resistor, and a plurality of DC power supplies that constantly supply a DC voltage to the power supply connection line. .

(作用) 本考案によるデータ伝送線の電源装置では、常時直流電
圧を供給する直流電源が複数個設けられているので、少
なくとも1個の直流電源が健全であればデータ伝送線の
終端抵抗に常に直流電圧を印加することができる。
(Operation) Since the power supply device for the data transmission line according to the present invention is provided with a plurality of DC power supplies that constantly supply a DC voltage, if at least one DC power supply is healthy, the terminating resistance of the data transmission line is always maintained. A DC voltage can be applied.

(実施例) 第1図は本考案の一実施例を示す構成図である。(Embodiment) FIG. 1 is a block diagram showing an embodiment of the present invention.

同図に示すように、データ伝送線1の両端には第1終端
装置2,及び第2終端装置3が設けられている。そして、
両終端装置2,3は電源接続線9,及び接地線8によって接
続されている。
As shown in the figure, a first terminating device 2 and a second terminating device 3 are provided at both ends of the data transmission line 1. And
Both terminators 2 and 3 are connected by a power supply connection line 9 and a ground line 8.

両終端装置2,3間には多数(図では2個)の端末装置4
が設けられており、それぞれが、データ伝送線1,及び接
地線8と接続されている。
A large number (two in the figure) of terminal devices 4 between the two terminating devices 2 and 3.
Are provided, and each is connected to the data transmission line 1 and the ground line 8.

端末装置4にはドライバ6とレシーバ7とが備えられて
おり、これらによって他の装置とのデータの送受信がさ
れている。
The terminal device 4 is provided with a driver 6 and a receiver 7, and data is transmitted and received to and from other devices by these.

第1終端装置2,及び第2終端装置3は端末装置4と同様
にドライバ6,及びレシーバ7を備えており、更に、デー
タ伝送線1に直流電圧を印加する直流電源5と、直流電
源5の逆流を防止するダイオード10と、反射波を防止す
る終端抵抗R1,及びR2から構成されている。
The first terminating device 2 and the second terminating device 3 are provided with a driver 6 and a receiver 7 like the terminal device 4, and further, a DC power source 5 for applying a DC voltage to the data transmission line 1 and a DC power source 5 And a terminating resistor R1 and R2 for preventing a reflected wave.

電源接続線9は、両終端装置2,3の直流電圧印加点を接
続するものであり、一方の直流電源5の電源供給が絶た
れても、他方の直流電源5がバックアップすることがで
きるようになっている。
The power supply connecting line 9 connects the DC voltage application points of both the terminal devices 2 and 3, so that even if the power supply of one DC power supply 5 is cut off, the other DC power supply 5 can back up. It has become.

いま、停電や機器の故障等により第1終端装置2が停止
し、その結果、第1終端装置2の直流電源5が作動しな
なっても、第2終端装置3にある直流電源5の出力電圧
Vccが電源接続線9を介して第1終端装置2側に常に供
給されている。
Now, even if the first terminating device 2 stops due to a power failure or equipment failure, and as a result, the dc power source 5 of the first terminating device 2 does not operate, the output of the dc power source 5 in the second terminating device 3 Voltage
Vcc is constantly supplied to the first terminating device 2 side via the power supply connecting line 9.

従って、停電や機器の故障等の原因で一方の直流電源5
が停止した場合においても、他方の直流電源5から常に
直流電圧の供給を受けているので、データの誤伝送を引
き起こすという不具合は回避される。
Therefore, due to power failure or equipment failure, one DC power source 5
Even when is stopped, since the DC voltage is constantly supplied from the other DC power source 5, the problem of erroneous data transmission can be avoided.

第2図は、本考案の他の実施例を示す構成図である。FIG. 2 is a block diagram showing another embodiment of the present invention.

この実施例では、データ伝送線の両端部に独立した終端
抵抗回路11が設けられており、両終端抵抗回路11は電源
接続線9と、データ伝送線1と、接地線8とによって接
続されている。また、接地線8とデータ伝送線1の間に
は抵抗R1,データ伝送線1と電源接続線9との間には抵
抗R2が接続されている。
In this embodiment, independent terminating resistor circuits 11 are provided at both ends of the data transmission line, and both terminating resistor circuits 11 are connected by a power supply connection line 9, a data transmission line 1, and a ground line 8. There is. A resistor R1 is connected between the ground line 8 and the data transmission line 1, and a resistor R2 is connected between the data transmission line 1 and the power supply connection line 9.

両終端抵抗回路11間には多数(図では3個)の端末装置
4が設けられており、それぞれの端末装置はデータ伝送
線1,及び接地線8に接続されている。
A large number (three in the figure) of terminal devices 4 are provided between both terminating resistor circuits 11, and each terminal device is connected to the data transmission line 1 and the ground line 8.

各端末装置4は直流電源5を有しており、これらの各直
流電源5はダイオード10を介して、電源接続線9に接続
されている。
Each terminal device 4 has a DC power supply 5, and each DC power supply 5 is connected to a power supply connection line 9 via a diode 10.

したがって、この実施例では少なくとも1個の直流電源
5が健全であれば電源接続線9を介して両終端抵抗回路
11に電圧を印加することができるので、より正確なデー
タ伝送ができるようになる。
Therefore, in this embodiment, if at least one DC power source 5 is healthy, the two termination resistor circuits are connected via the power source connecting line 9.
Since voltage can be applied to 11, more accurate data transmission becomes possible.

[考案の効果] 以上説明したように、本考案では、2個以上の直流電源
から電源接続線に直流電圧を供給しているので、少なく
とも1個の直流電源が健全であれば、データ伝送線の終
端抵抗に直流電圧を印加することができるようになる。
[Effects of the Invention] As described above, in the present invention, since the DC voltage is supplied to the power supply connection line from two or more DC power supplies, if at least one DC power supply is healthy, the data transmission line is It becomes possible to apply a DC voltage to the terminating resistor.

このため、確実にデータ伝送線の終端部にて発生する反
射波を防止することができ、常に安定したデータ伝送が
できるようになるという効果が得られる。
Therefore, it is possible to reliably prevent the reflected wave generated at the terminal end of the data transmission line, and it is possible to obtain an effect that stable data transmission can be always performed.

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

第1図は本考案の一実施例を示す構成図、第2図は本考
案の他の実施例を示す構成図、第3図は従来例を示す構
成図である。 1……データ伝送線、2……第1終端装置 3……第2終端装置、4……端末装置 5……直流電源、9……電源接続線 10……ダイオード、11……終端抵抗回路
FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing another embodiment of the present invention, and FIG. 3 is a block diagram showing a conventional example. 1 ... Data transmission line, 2 ... First terminating device 3 ... Second terminating device, 4 ... Terminal device 5 ... DC power supply, 9 ... Power supply connection line 10 ... Diode, 11 ... Termination resistance circuit

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項1】データ伝送線の両端に設けられた各々の終
端抵抗に、直流電圧を印加する装置において、 前記一方の終端抵抗における電圧印加点と前記他方の終
端抵抗における電圧印加点とを接続する電源接続線と、 前記電源接続線に常時直流電圧を供給する複数個の直流
電源と、 を有することを特徴とするデータ伝送線の電源装置。
1. A device for applying a DC voltage to each terminating resistor provided at both ends of a data transmission line, wherein a voltage applying point at said one terminating resistor and a voltage applying point at said other terminating resistor are connected. And a plurality of DC power supplies that constantly supply a DC voltage to the power supply connection line.
JP1988112095U 1988-08-29 1988-08-29 Data transmission line power supply Expired - Fee Related JPH0735472Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1988112095U JPH0735472Y2 (en) 1988-08-29 1988-08-29 Data transmission line power supply

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1988112095U JPH0735472Y2 (en) 1988-08-29 1988-08-29 Data transmission line power supply

Publications (2)

Publication Number Publication Date
JPH0235549U JPH0235549U (en) 1990-03-07
JPH0735472Y2 true JPH0735472Y2 (en) 1995-08-09

Family

ID=31350732

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1988112095U Expired - Fee Related JPH0735472Y2 (en) 1988-08-29 1988-08-29 Data transmission line power supply

Country Status (1)

Country Link
JP (1) JPH0735472Y2 (en)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0630502B2 (en) * 1986-11-14 1994-04-20 横河電機株式会社 Data bus relay device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
AT&T「情報通信システム」P.998−1005ラテイス(S59.7.15)

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Publication number Publication date
JPH0235549U (en) 1990-03-07

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