JPH04335796A - Hand held terminal - Google Patents

Hand held terminal

Info

Publication number
JPH04335796A
JPH04335796A JP10705991A JP10705991A JPH04335796A JP H04335796 A JPH04335796 A JP H04335796A JP 10705991 A JP10705991 A JP 10705991A JP 10705991 A JP10705991 A JP 10705991A JP H04335796 A JPH04335796 A JP H04335796A
Authority
JP
Japan
Prior art keywords
transmission line
handheld terminal
power receiving
built
receiving circuit
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
JP10705991A
Other languages
Japanese (ja)
Inventor
Takashi Higuchi
隆司 樋口
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 JP10705991A priority Critical patent/JPH04335796A/en
Publication of JPH04335796A publication Critical patent/JPH04335796A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To eliminate the need for a built-in battery, to limit the operating time due to the capacity of the built-in battery, and to save trouble of replacement or charging of the built-in battery. CONSTITUTION:A hand held terminal is provided with a power reception circuit 9 comprising a parallel circuit consisting of a Zener diode 10 and a capacitor 11, and the power reception circuit 9 is connected in series with a 4-20mA transmission line 1 and is operated while receiving power from the 4-20mA transmission line 1.

Description

【発明の詳細な説明】[Detailed description of the invention]

【0001】[発明の目的][Object of the invention]

【0002】0002

【産業上の利用分野】本発明は、計装用4−20mA伝
送ラインに接続して使用し、センサと通信対話するハン
ドヘルドターミナルに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a handheld terminal for use in connection with an instrumentation 4-20 mA transmission line to communicatively interact with a sensor.

【0003】0003

【従来の技術】従来のハンドヘルドターミナルは、その
動作に要する電力を全て内蔵電池でまかなっていた。
2. Description of the Related Art Conventional handheld terminals rely on built-in batteries to provide all the power required for their operation.

【0004】0004

【発明が解決しようとする課題】内蔵電池で全ての電力
をまかなう従来のハンドヘルドターミナルでは、動作時
間は電池の容量によって制限され、定期的な充電、もし
くは電池交換の手間が必要であり、長時間の連続使用も
制限される。
[Problems to be Solved by the Invention] With conventional handheld terminals that use built-in batteries to provide all their power, the operating time is limited by the capacity of the battery, requiring periodic charging or battery replacement, resulting in long operating times. Continuous use of is also restricted.

【0005】そこで本発明は、接続した4−20mA伝
送ラインから電力を得ることができ、充電等の手間なし
で長時間の連続使用が可能なハンドヘルドターミナルを
実現することを課題とする。
SUMMARY OF THE INVENTION An object of the present invention is to realize a handheld terminal that can obtain power from a connected 4-20mA transmission line and can be used continuously for a long time without the need for charging or the like.

【0006】[発明の構成][Configuration of the invention]

【0007】[0007]

【課題を解決するための手段】本発明のハンドヘルドタ
ーミナルは、ツェナーダイオードとコンデンサの並列回
路から成る受電回路を具備し、この受電回路を4−20
mA伝送ラインに直列に接続することで4−20mA伝
送ラインから電力を供給されて動作することを特徴とす
る。
[Means for Solving the Problems] The handheld terminal of the present invention includes a power receiving circuit consisting of a parallel circuit of a Zener diode and a capacitor.
It is characterized in that it operates by being supplied with power from the 4-20 mA transmission line by being connected in series to the mA transmission line.

【0008】[0008]

【作用】本発明のハンドヘルドターミナルにおいては、
受電回路がツェナーダイオードの電圧降下によりハンド
ヘルドターミナルが必要としている直流電圧を出力する
。この電力を得てハンドヘルドターミナルが動作する。 受電回路でコンデンサが並列に接続されているため、通
信信号に対して負荷にならない。
[Operation] In the handheld terminal of the present invention,
The power receiving circuit outputs the DC voltage required by the handheld terminal due to the voltage drop of the Zener diode. The handheld terminal operates using this power. Since the capacitors are connected in parallel in the power receiving circuit, they do not become a load on communication signals.

【0009】[0009]

【実施例】以下、図面に示した実施例に基いて本発明を
詳細に説明する。
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail below based on embodiments shown in the drawings.

【0010】図1(a),(b)および図2に本発明一
実施例のハンドヘルドターミナルを示す。図1(a)は
、ハンドヘルドターミナルの4−20mA伝送ラインへ
の接続を示す結線図であり、図1(b)はハンドヘルド
ターミナルに設けられた受電回路を示す回路図であり、
図2は図1(a)におけるスイッチ部の接続機構例を示
す概略図である。
FIGS. 1(a), 1(b) and 2 show a handheld terminal according to an embodiment of the present invention. FIG. 1(a) is a wiring diagram showing the connection of the handheld terminal to the 4-20mA transmission line, and FIG. 1(b) is a circuit diagram showing the power receiving circuit provided in the handheld terminal.
FIG. 2 is a schematic diagram showing an example of a connection mechanism of the switch section in FIG. 1(a).

【0011】図1(a)に示すように、4−20mA伝
送ライン1に、センサ2,負荷抵抗3,電源4が直列に
接続されており、ハンドヘルドターミナル5は通信ケー
ブル6を介してセンサ2と通信を行なう。ハンドヘルド
ターミナル5を接続しない状態では、スイッチ7は閉じ
ている。
As shown in FIG. 1(a), a sensor 2, a load resistor 3, and a power source 4 are connected in series to a 4-20 mA transmission line 1, and a handheld terminal 5 connects the sensor 2 via a communication cable 6. communicate with. When the handheld terminal 5 is not connected, the switch 7 is closed.

【0012】このスイッチ7の両端にハンドヘルドター
ミナル5の受電ケーブル8を接続する。この受電ケーブ
ル8は、ハンドヘルドターミナル5内に設けられた受電
回路9に直列に接続される。この受電回路9は、図1(
b)に示すように、ツェナーダイオード10とコンデン
サ11の並列回路から成っている。スイッチ7を開くと
、受電ケーブル8を介して受電回路9が4−20mA伝
送ライン1に直列に接続され、ツェナーダイオード10
の電圧降下によりハンドヘルドターミナル5が必要とし
ている直流電圧が受電回路9の出力端子12からハンド
ヘルドターミナル5に供給される。
A power receiving cable 8 of the handheld terminal 5 is connected to both ends of this switch 7. This power receiving cable 8 is connected in series to a power receiving circuit 9 provided within the handheld terminal 5. This power receiving circuit 9 is shown in FIG.
As shown in b), it consists of a parallel circuit of a Zener diode 10 and a capacitor 11. When the switch 7 is opened, the power receiving circuit 9 is connected in series to the 4-20 mA transmission line 1 via the power receiving cable 8, and the Zener diode 10
Due to the voltage drop, the DC voltage required by the handheld terminal 5 is supplied from the output terminal 12 of the power receiving circuit 9 to the handheld terminal 5.

【0013】図1(a)におけるスイッチ7部分の接続
機構例を図2に示す。図2に示すように、ハンドヘルド
ターミナル5のプラグ部13を4−20mA伝送ライン
1の専用端子台16に挿入することによってハンドヘル
ドターミナル5の受電回路9を4−20mA伝送ライン
1に接続するものである。
FIG. 2 shows an example of the connection mechanism of the switch 7 portion in FIG. 1(a). As shown in FIG. 2, the power receiving circuit 9 of the handheld terminal 5 is connected to the 4-20mA transmission line 1 by inserting the plug part 13 of the handheld terminal 5 into the dedicated terminal block 16 of the 4-20mA transmission line 1. be.

【0014】プラグ部13の内部に受電回路9が内蔵さ
れ、ジャック14が接続されており、ジャック14の間
にはプラグ凸部15が形成されている。一方、専用端子
台16には、ジャック14に対応するソケット17が配
置され、ソケット17の下方にスイッチ7が配置され、
このスイッチ7の接片上面にはスイッチ凸部18が取着
されており、スイッチ7の接片は下方からコイルスプリ
ング19で支えられている。スイッチ7は、4−20m
A伝送ライン1に直列に接続されており、スイッチ7の
両端にソケット17が接続されている。
A power receiving circuit 9 is built inside the plug portion 13 and a jack 14 is connected thereto, and a plug protrusion 15 is formed between the jacks 14. On the other hand, a socket 17 corresponding to the jack 14 is arranged on the dedicated terminal block 16, and a switch 7 is arranged below the socket 17.
A switch protrusion 18 is attached to the upper surface of the contact piece of the switch 7, and the contact piece of the switch 7 is supported from below by a coil spring 19. Switch 7 is 4-20m
It is connected in series to the A transmission line 1, and sockets 17 are connected to both ends of the switch 7.

【0015】ハンドヘルドターミナル5のプラグ部13
を専用端子台16に挿入すると、先ずジャック14とソ
ケット17が接続され、4−20mA伝送ライン1から
受電回路9へのバイパス回路ができる。この段階ではま
だスイッチ7は閉じているため、4−20mA伝送ライ
ン1の電流は受電回路9へは流れない。
Plug portion 13 of handheld terminal 5
When inserted into the dedicated terminal block 16, the jack 14 and socket 17 are first connected, creating a bypass circuit from the 4-20 mA transmission line 1 to the power receiving circuit 9. At this stage, the switch 7 is still closed, so the current of the 4-20 mA transmission line 1 does not flow to the power receiving circuit 9.

【0016】プラグ部13をさらに奥へ挿入すると、プ
ラグ凸部15がスイッチ凸部18を押し下げるためスイ
ッチ7が開き、受電回路9の4−20mA伝送ライン1
への直列接続が完了する。
When the plug part 13 is inserted deeper, the plug convex part 15 pushes down the switch convex part 18, so the switch 7 opens, and the 4-20 mA transmission line 1 of the power receiving circuit 9 is opened.
Series connection is completed.

【0017】取り外しのときは、逆のステップで、先ず
スイッチ7がコイルスプリング19の反発力により閉じ
、その後、ジャック14とソケット17が離れて受電回
路9へのバイパス回路が4−20mA伝送ライン1から
外れるようになっており、4−20mA伝送ライン1の
4−20mAループ電流を遮断すること無くハンドヘル
ドターミナル5の接続,取り出しができる。
At the time of removal, the steps are reversed. First, the switch 7 is closed by the repulsive force of the coil spring 19, and then the jack 14 and the socket 17 are separated, and the bypass circuit to the power receiving circuit 9 is connected to the 4-20 mA transmission line 1. The handheld terminal 5 can be connected and removed without interrupting the 4-20mA loop current of the 4-20mA transmission line 1.

【0018】なお、図2の機構は、ハンドヘルドターミ
ナル5の受電回路9の接続手段を示すものであり、通信
ケーブルの接続は別に行なうものとする。
Note that the mechanism shown in FIG. 2 shows a means for connecting the power receiving circuit 9 of the handheld terminal 5, and the communication cable is connected separately.

【0019】上記実施例によれば、ハンドヘルドターミ
ナル5は、4−20mA伝送ラインから電力を得て動作
するため、内蔵電池が不要であり、内蔵電池の容量によ
って使用時間が制限されることや、内蔵電池のメンテナ
ンスの手間等が解消される。
According to the above embodiment, the handheld terminal 5 operates by receiving power from the 4-20mA transmission line, so there is no need for a built-in battery, and the usage time is limited by the capacity of the built-in battery. The trouble of maintaining the built-in battery is eliminated.

【0020】なお、4−20mA伝送ライン1は、定電
流回路になっているため、ハンドヘルドターミナル5の
受電回路9を4−20mA伝送ライン1に接続しても負
荷抵抗両端の出力電圧への影響は無い。
Note that since the 4-20mA transmission line 1 is a constant current circuit, even if the power receiving circuit 9 of the handheld terminal 5 is connected to the 4-20mA transmission line 1, there will be no effect on the output voltage across the load resistance. There is no.

【0021】次に、本発明の他の実施例を説明する。Next, another embodiment of the present invention will be explained.

【0022】(a)図1(a)における4−20mA伝
送ラインは2線式を想定したが、4線式の4−20mA
ループにも同様に適用できる。
(a) Although the 4-20mA transmission line in Fig. 1(a) is assumed to be a two-wire system,
The same applies to loops.

【0023】(b)図2に示した接続機構は受電用であ
るが、通信用の端子も同じプラグ上に設け、一度のプラ
グの接続で受電用と通信用の両接続を同時に行なえるよ
うにしてもよい。
(b) Although the connection mechanism shown in FIG. 2 is for power reception, a communication terminal is also provided on the same plug so that both power reception and communication connections can be made at the same time by connecting the plug once. You may also do so.

【0024】(c)ハンドヘルドターミナルに充電式電
池を内蔵させ、4−20mA伝送ラインから得て余った
電力を充電すれば、4−20mA伝送ライン接続時以外
でも、使用可能(プリンタ機能等)で充電の手間のかか
らないハンドヘルドターミナルが実現する。
(c) If a rechargeable battery is built into the handheld terminal and the surplus power obtained from the 4-20mA transmission line is charged, it can be used (printer function, etc.) even when the 4-20mA transmission line is not connected. A handheld terminal that does not require the hassle of charging will be realized.

【0025】[0025]

【発明の効果】以上詳述したように本発明によれば、ツ
ェナーダイオードとコンデンサの並列回路から成る受電
回路を具備し、この受電回路を4−20mA伝送ライン
に直列に接続することで4−20mA伝送ラインから電
力を供給されて動作するハンドヘルドターミナルを実現
したことにより、本発明のハンドヘルドターミナルは内
蔵電池が不要となり、内蔵電池の容量によって使用時間
が制限されることや、内蔵電池のメンテナンスの手間等
が解消される。
As described in detail above, according to the present invention, a power receiving circuit consisting of a parallel circuit of a Zener diode and a capacitor is provided, and this power receiving circuit is connected in series to a 4-20 mA transmission line. By realizing a handheld terminal that operates by being supplied with power from a 20mA transmission line, the handheld terminal of the present invention does not require a built-in battery, and the usage time is limited by the capacity of the built-in battery, and maintenance of the built-in battery is avoided. Time and effort will be eliminated.

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

【図1】本発明一実施例のハンドヘルドターミナルを示
し、図1(a)はハンドヘルドターミナルの4−20m
A伝送ラインへの接続を示す結線図であり、図1(b)
はハンドヘルドターミナルに設けられた受電回路を示す
回路図である。
FIG. 1 shows a handheld terminal according to an embodiment of the present invention, and FIG. 1(a) shows a 4-20 m
It is a wiring diagram showing the connection to the A transmission line, and FIG. 1(b)
FIG. 2 is a circuit diagram showing a power receiving circuit provided in the handheld terminal.

【図2】図1(a)におけるスイッチ部の接続機構例を
示す概略図である。
FIG. 2 is a schematic diagram showing an example of a connection mechanism of the switch section in FIG. 1(a).

【符号の説明】[Explanation of symbols]

1…4−20mA伝送ライン 2…センサ 5…ハンドヘルドターミナル 6…通信ケーブル 7…スイッチ 8…受電ケーブル 9…受電回路 10…ツェナーダイオード 11…コンデンサ 12…出力端子 1...4-20mA transmission line 2...Sensor 5...Handheld terminal 6...Communication cable 7...Switch 8...Power receiving cable 9…Power receiving circuit 10...Zener diode 11...Capacitor 12...Output terminal

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】  計装用4−20mA伝送ラインに接続
することによりセンサと通信対話するハンドヘルドター
ミナルにおいて、ツェナーダイオードとコンデンサの並
列回路から成る受電回路を具備し、この受電回路を前記
4−20mA伝送ラインに直列に接続することで4−2
0mA伝送ラインから電力を供給されて動作することを
特徴とするハンドヘルドターミナル。
1. A handheld terminal that communicates and interacts with a sensor by connecting to a 4-20 mA transmission line for instrumentation, comprising a power receiving circuit consisting of a parallel circuit of a Zener diode and a capacitor, and the power receiving circuit is connected to the 4-20 mA transmission line. 4-2 by connecting in series to the line
A handheld terminal that operates by being supplied with power from a 0mA transmission line.
JP10705991A 1991-05-13 1991-05-13 Hand held terminal Pending JPH04335796A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10705991A JPH04335796A (en) 1991-05-13 1991-05-13 Hand held terminal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10705991A JPH04335796A (en) 1991-05-13 1991-05-13 Hand held terminal

Publications (1)

Publication Number Publication Date
JPH04335796A true JPH04335796A (en) 1992-11-24

Family

ID=14449458

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10705991A Pending JPH04335796A (en) 1991-05-13 1991-05-13 Hand held terminal

Country Status (1)

Country Link
JP (1) JPH04335796A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006157865A (en) * 2004-11-01 2006-06-15 Yokogawa Electric Corp Field device, and method for transmitting signal of the field device
JP4851339B2 (en) * 2003-11-25 2012-01-11 フィッシャー コントロールズ インターナショナル リミテッド ライアビリティー カンパニー Fluid discharge system
US8694060B2 (en) 2008-06-17 2014-04-08 Rosemount Inc. Form factor and electromagnetic interference protection for process device wireless adapters
US8847571B2 (en) 2008-06-17 2014-09-30 Rosemount Inc. RF adapter for field device with variable voltage drop
US8929948B2 (en) 2008-06-17 2015-01-06 Rosemount Inc. Wireless communication adapter for field devices
US9310794B2 (en) 2011-10-27 2016-04-12 Rosemount Inc. Power supply for industrial process field device
US9674976B2 (en) 2009-06-16 2017-06-06 Rosemount Inc. Wireless process communication adapter with improved encapsulation
US10761524B2 (en) 2010-08-12 2020-09-01 Rosemount Inc. Wireless adapter with process diagnostics

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4851339B2 (en) * 2003-11-25 2012-01-11 フィッシャー コントロールズ インターナショナル リミテッド ライアビリティー カンパニー Fluid discharge system
JP2006157865A (en) * 2004-11-01 2006-06-15 Yokogawa Electric Corp Field device, and method for transmitting signal of the field device
US8005514B2 (en) 2004-11-01 2011-08-23 Yokogawa Electric Corporation Field device and method for transferring the field device's signals
US8694060B2 (en) 2008-06-17 2014-04-08 Rosemount Inc. Form factor and electromagnetic interference protection for process device wireless adapters
US8847571B2 (en) 2008-06-17 2014-09-30 Rosemount Inc. RF adapter for field device with variable voltage drop
US8929948B2 (en) 2008-06-17 2015-01-06 Rosemount Inc. Wireless communication adapter for field devices
US9674976B2 (en) 2009-06-16 2017-06-06 Rosemount Inc. Wireless process communication adapter with improved encapsulation
US10761524B2 (en) 2010-08-12 2020-09-01 Rosemount Inc. Wireless adapter with process diagnostics
US9310794B2 (en) 2011-10-27 2016-04-12 Rosemount Inc. Power supply for industrial process field device

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