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JPS6111500B2 - - Google Patents
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JPS6111500B2 - - Google Patents

Info

Publication number
JPS6111500B2
JPS6111500B2 JP53136889A JP13688978A JPS6111500B2 JP S6111500 B2 JPS6111500 B2 JP S6111500B2 JP 53136889 A JP53136889 A JP 53136889A JP 13688978 A JP13688978 A JP 13688978A JP S6111500 B2 JPS6111500 B2 JP S6111500B2
Authority
JP
Japan
Prior art keywords
data
transmission
terminal device
modem
transmission data
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
Application number
JP53136889A
Other languages
Japanese (ja)
Other versions
JPS5563149A (en
Inventor
Shigeyuki Suzuki
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.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP13688978A priority Critical patent/JPS5563149A/en
Publication of JPS5563149A publication Critical patent/JPS5563149A/en
Publication of JPS6111500B2 publication Critical patent/JPS6111500B2/ja
Granted legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/14Two-way operation using the same type of signal, i.e. duplex
    • H04L5/16Half-duplex systems; Simplex/duplex switching; Transmission of break signals non-automatically inverting the direction of transmission

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Bidirectional Digital Transmission (AREA)
  • Maintenance And Management Of Digital Transmission (AREA)

Description

【発明の詳細な説明】 本発明は、端末装置がデータを送信しながらモ
デムを含む自身のエラーを検出できるようになつ
た半二重通信方式におけるエラー検出方式に関す
るものである。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an error detection method in a half-duplex communication system that allows a terminal device to detect errors in itself, including a modem, while transmitting data.

従来の伝送エラーの検出は送信側で水平バリテ
イなどのチエツク符号を電文に付加し、受信側で
この内容をチエツクし、送信側に応答している。
このようなエラーが検出された場合、その伝送エ
ラーが回線上の障害によるものか、送信側の障害
によるものかを判断できず障害調査に時間と労力
を必要としていた。
Conventionally, transmission errors are detected by adding a check code such as horizontal validity to the message on the sending side, checking the contents on the receiving side, and responding to the sending side.
When such an error is detected, it is impossible to determine whether the transmission error is due to a fault on the line or a fault on the transmitting side, requiring time and effort to investigate the fault.

本発明は、上記の考察にもとづくものであつ
て、伝送エラーが回線によるものか或は送信側に
よるものかを明確に区別できようにするため、端
末装置が自己の送信データを自分自身でチエツク
できるようにした半二重通信方式におけるエラー
検出方式を提供することを目的としている。そし
てそのため、本発明の半二重通信方式におけるエ
ラー検出方式は、端末装置と、該端末装置からの
送信データを変調する変調回路と受信データを復
調する復調回路とを有するモデムと、該モデムに
接続された回線とを有すると共に、該変調回路に
より変調された送信データが該モデム内で該復調
回路に取り込まれるようにされた半二重通信方式
において、前記復調回路からの前記変調された送
信データに対応する受信データを、前記端末装置
に取り込むように構成すると共に、前記端末装置
に、前記モデムからの所定の制御信号の値に基づ
いて該受信データが自己の送出した送信データで
あるか否かを識別する受信データ識別手段と、該
受信データが自己の送出した送信データである場
合に該受信データと前記送信データとを比較する
比較手段とを設け、該比較手段の比較結果に基づ
いてエラー検出を行うようにしたことを特徴とす
るものである。以下、本発明を図面を参照しつつ
説明する。
The present invention is based on the above consideration, and in order to clearly distinguish whether a transmission error is caused by the line or by the sending side, the terminal device checks its own transmitted data by itself. The purpose of this paper is to provide an error detection method in a half-duplex communication system that enables the following. Therefore, the error detection method in the half-duplex communication system of the present invention includes a terminal device, a modem having a modulation circuit that modulates transmission data from the terminal device, and a demodulation circuit that demodulates received data, In a half-duplex communication system, the modulated transmission from the demodulation circuit has a connected line and the transmission data modulated by the modulation circuit is taken into the demodulation circuit within the modem. The configuration is configured such that the received data corresponding to the data is taken into the terminal device, and the terminal device is asked whether the received data is the transmission data transmitted by itself based on the value of a predetermined control signal from the modem. A received data identifying means for identifying whether or not the received data is transmitted by the self, and a comparing means for comparing the received data and the transmitted data when the received data is the transmitted data sent by the self, and based on the comparison result of the comparing means. This feature is characterized in that error detection is performed by Hereinafter, the present invention will be explained with reference to the drawings.

第1図は本発明の1実施例のブロツク図、第2
〓〓〓〓
図はその動作説明図である。
FIG. 1 is a block diagram of one embodiment of the present invention, and FIG.
〓〓〓〓
The figure is an explanatory diagram of the operation.

第1図において、1はマイクロプロセツサ、2
は回線制御部、3はモデム、4は送信電文エリ
ヤ、5は受信電文エリヤ、6は送信レジスタ、7
は受信レジスタ、8は送信制御部、9はモニタ電
文コンベア制御部、10はRS制御部、11はCS
検出部、12は遅延部、13は受信制御部、14
は送信バツフア、15は受信バツフア、16は並
列−直列変換部、17は直列−並列変換部、18
はブロツク・チエツク符号生成部、19は変調回
路、20は復調回路、21はキヤリア信号生成
部、22は変成器をそれぞれ示している。なお、
マイクロプロセツサ1は、送信制御部8、モニタ
電文コンペア制御部9、RS制御部10、CS検出
部11、遅延部12および受信制御部13をハー
ドウエアとして有しているものでなく、これらと
同一機能を実行するためのプログラムを有してい
るものである。第1図ではマイクロプロセツサ1
と回線制御部2が端末装置を構成しているものと
考えてよい。
In FIG. 1, 1 is a microprocessor, 2
is a line control unit, 3 is a modem, 4 is a sending message area, 5 is a receiving message area, 6 is a sending register, 7
is a reception register, 8 is a transmission control section, 9 is a monitor message conveyor control section, 10 is an RS control section, 11 is a CS
Detection unit, 12 is a delay unit, 13 is a reception control unit, 14
is a transmission buffer, 15 is a reception buffer, 16 is a parallel-serial converter, 17 is a serial-parallel converter, 18
Reference numeral 19 indicates a block check code generation section, 19 a modulation circuit, 20 a demodulation circuit, 21 a carrier signal generation section, and 22 a transformer. In addition,
The microprocessor 1 does not have a transmission control section 8, a monitor message comparison control section 9, an RS control section 10, a CS detection section 11, a delay section 12, and a reception control section 13 as hardware; It has a program for executing the same function. In Figure 1, microprocessor 1
It may be considered that the line control unit 2 constitutes a terminal device.

次に、第1図の動作を第2図を参照しつつ説明
する。先ず、送信制御部8がRS制御部10に対
して送信要求信号RSを送信することを指令す
る。RS制御部10は、この指令を受取ると送信
要求信号RSをモデム3へ送信する。この送信要
求信号RSを受取ると、モデム3のキヤリア信号
生成部21はキヤリヤ信号を変調回路19に供給
すると共に、送信可信号CSをマイクロプロセツ
サ1へ返送する。この送信信号CSを受取ると、
送信制御部8はMPUライトを指令する。このラ
イト命令によつて、伝送制御符号STX、データ
D1ないしDm、およびEND情報すなわち伝送制御
符号ETXが送信電文エリアから逐次取出され、
送信レジスタ6を経由して送信バツフアに書込ま
れる。送信バツフア内のデータは、並列−直列変
換器16によつて直列の送信データSDに変換さ
れ、この直列送信データSDは変調回路19で変
調されて回線に送出される。従来の半二重回線の
モデムでは、点線で示すように変調回路19から
復調回路20に至る受信禁止信号線が設けられ、
送信中は受信を禁止するように構成されている
が、第1図の実施例ではこの信号線は削除されて
いる。
Next, the operation shown in FIG. 1 will be explained with reference to FIG. 2. First, the transmission control section 8 instructs the RS control section 10 to transmit a transmission request signal RS. Upon receiving this command, the RS control unit 10 transmits a transmission request signal RS to the modem 3. Upon receiving the transmission request signal RS, the carrier signal generation section 21 of the modem 3 supplies the carrier signal to the modulation circuit 19 and returns the transmission enable signal CS to the microprocessor 1. Upon receiving this transmission signal CS,
The transmission control unit 8 instructs MPU write. This write command causes transmission control code STX, data
D1 to Dm and END information, that is, transmission control code ETX, are sequentially extracted from the transmission message area,
It is written to the transmission buffer via the transmission register 6. The data in the transmission buffer is converted into serial transmission data SD by a parallel-to-serial converter 16, and this serial transmission data SD is modulated by a modulation circuit 19 and sent to the line. In a conventional half-duplex line modem, a reception prohibition signal line is provided from the modulation circuit 19 to the demodulation circuit 20, as shown by the dotted line.
Although the structure is such that reception is prohibited during transmission, this signal line is omitted in the embodiment shown in FIG.

上記のように、送信データSDは再び取込まれ
て受信データRDとなるが、このデータは直列−
並列変換部17で並列に変換されて受信バツフア
15に格納される。端末装置は送信可信号CSが
送られて来ているので、この受信データが相手局
が送信したものでなく、自己の送出した送信デー
タであると認識する。送信可信号CSは遅延部1
2に入力され、遅延部12は遅延送信可信号
CSDLをモニタ電文コンベア制御部9に入力す
る。モニタ電文コンベア制御部9は受信制御部1
3を起動する。受信制御部13は起動されると、
MPUリード命令を発行する。このMPUリード命
令が実行されると、受信バツフア15の内容は、
受信レジスタ7を経由して受信電文エリヤ5に送
られ、そしてこれに格納される。伝送制御符号
ETXを検出した時、受信制御部13はモニタ電
文制御部に対してコンベア指令を通知する。コン
ベア指令を受取ると、モニタ電文コンベア制御部
9は送信電文エリア4の内容を受信データ・エリ
ア5の内容とを比較する。次いで、データとブロ
ツク・チエツク符号BCCとの一致がチエツクさ
れる。通信データと受信データの不一致又はデー
タとブロツク・チエツク符号BCCの不一致が検
出されると、端末装置又はモデムに障害が存在す
ることになる。上記の不一致は、表示装置で表示
される。
As mentioned above, the transmitted data SD is captured again and becomes the received data RD, but this data is serially
The data is converted into parallel data by the parallel conversion unit 17 and stored in the reception buffer 15. Since the terminal device has been sent the clear-to-send signal CS, it recognizes that this received data is not sent by the other station, but is the transmission data sent by itself. The ready-to-send signal CS is sent to delay section 1
2, and the delay unit 12 outputs a delayed transmission ready signal.
The CSDL is input to the monitor telegram conveyor control unit 9. The monitor message conveyor control unit 9 is the reception control unit 1
Start 3. When the reception control unit 13 is activated,
Issue an MPU read command. When this MPU read command is executed, the contents of the receive buffer 15 are
It is sent to the reception message area 5 via the reception register 7 and stored there. transmission control code
When detecting ETX, the reception control unit 13 notifies the monitor message control unit of a conveyor command. Upon receiving the conveyor command, the monitor message conveyor control section 9 compares the contents of the transmission message area 4 with the contents of the reception data area 5. The data is then checked for agreement with the block check code BCC. If a mismatch between the communication data and the received data or a mismatch between the data and the block check code BCC is detected, a fault exists in the terminal or modem. The above discrepancies are displayed on the display device.

以上の説明から明らかなように、本発明は、半
二重通信方式においてはモデム内の復調回路が変
調回路により変調された送信データを常に復調す
るようにしていることに鑑み、この復調回路によ
り復調された受信データを端末装置に取込み、そ
して端末装置側において受信データが自己の送出
した送信データであるかを識別し、自己の送出し
た送信データの場合、前記受信データと送信デー
タとを比較するだけの極めて簡単な構成、即ち半
二重通信方式においては変調回路から復調回路に
至る受信禁止信号線への受信禁止信号の出力を停
止するのみで、モデムから回線へ出力される送信
データを端末装置側へ取り込むことが出来、余分
な構成を付加することなく、エラー検出を行うこ
とが可能になると共に、端末装置が送信データを
自分自身でチエツクしているので、伝送エラーが
生じた場合、送信側の障害によるものか、回線上
の障害によるものかを明確に識別することが出来
る。
As is clear from the above description, the present invention takes into account that in half-duplex communication systems, the demodulation circuit in the modem always demodulates the transmission data modulated by the modulation circuit. The demodulated received data is taken into the terminal device, and the terminal device side identifies whether the received data is the transmission data that it sent out, and if it is the transmission data that it sent out, it compares the received data and the transmission data. In a half-duplex communication system, the transmission data output from the modem to the line is stopped by simply stopping the output of the reception prohibition signal to the reception prohibition signal line from the modulation circuit to the demodulation circuit. It can be imported into the terminal device side, making it possible to detect errors without adding any extra configuration, and since the terminal device checks the transmitted data itself, if a transmission error occurs. , it is possible to clearly identify whether the problem is due to a failure on the transmitting side or a failure on the line.

〓〓〓〓
〓〓〓〓

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

第1図は本発明の1実施例のブロツク図、第2
図はその動作説明図である。 1……マイクロプロセツサ、2……回線制御
部、3……モデム、4……送信電文エリヤ、5…
…受信電文エリヤ、6……送信レジスタ、7……
受信レジスタ、8……送信制御部、9……モニタ
電文コンベア制御部、10……RS制御部、11
……CS検出部、12……遅延部、13……受信
制御部、14……送信バツフア、15……受信バ
ツフア、16……並列−直列変換部、17……直
列−並列変換部、18……ブロツク・チエツク符
号生成部、19……変調回路、20……復調回
路、21……キヤリヤ信号生成部、22……変成
器。 〓〓〓〓
FIG. 1 is a block diagram of one embodiment of the present invention, and FIG.
The figure is an explanatory diagram of the operation. 1... Microprocessor, 2... Line control unit, 3... Modem, 4... Transmission message area, 5...
...Receive message area, 6...Send register, 7...
Reception register, 8...Transmission control unit, 9...Monitor message conveyor control unit, 10...RS control unit, 11
... CS detection section, 12 ... Delay section, 13 ... Reception control section, 14 ... Transmission buffer, 15 ... Reception buffer, 16 ... Parallel-serial conversion section, 17 ... Serial-parallel conversion section, 18 . . . block check code generation section, 19 . . . modulation circuit, 20 . . . demodulation circuit, 21 . . . carrier signal generation section, 22 . 〓〓〓〓

Claims (1)

【特許請求の範囲】[Claims] 1 端末装置と、該端末装置からの送信データを
変調する変調回路と受信データを復調する復調回
路とを有するモデムと、該モデムに接続された回
線とを有すると共に、該変調回路により変調され
た送信データが該モデム内で該復調回路に取り込
まれるようにされた半二重通信方式において、前
記復調回路からの前記変調された送信データに対
応する受信データを、前記端末装置に取り込むよ
うに構成すると共に、前記端末装置に、前記モデ
ムからの所定の制御信号の値に基づいて該受信デ
ータが自己の送出した送信データであるか否かを
識別する受信データ識別手段と、該受信データが
自己の送出した送信データである場合に該受信デ
ータと前記送信データとを比較する比較手段とを
設け、該比較手段の比較結果に基づいてエラー検
出を行うようにしたことを特徴とする半二重通信
方式におけるエラー検出方式。
1. A terminal device, a modem having a modulation circuit that modulates transmission data from the terminal device, and a demodulation circuit that demodulates received data, and a line connected to the modem, and a line that is modulated by the modulation circuit. In a half-duplex communication system in which transmission data is received by the demodulation circuit within the modem, the terminal device is configured to receive reception data corresponding to the modulated transmission data from the demodulation circuit. At the same time, the terminal device includes received data identification means for identifying whether or not the received data is transmission data transmitted by the terminal device based on the value of a predetermined control signal from the modem; A half-duplex device characterized in that a comparison means is provided for comparing the received data and the transmission data when the received data is the transmission data sent by the said transmission data, and error detection is performed based on the comparison result of the comparison means. Error detection method in communication system.
JP13688978A 1978-11-07 1978-11-07 Error detection system for half-duplex communication system Granted JPS5563149A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13688978A JPS5563149A (en) 1978-11-07 1978-11-07 Error detection system for half-duplex communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13688978A JPS5563149A (en) 1978-11-07 1978-11-07 Error detection system for half-duplex communication system

Publications (2)

Publication Number Publication Date
JPS5563149A JPS5563149A (en) 1980-05-13
JPS6111500B2 true JPS6111500B2 (en) 1986-04-03

Family

ID=15185912

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13688978A Granted JPS5563149A (en) 1978-11-07 1978-11-07 Error detection system for half-duplex communication system

Country Status (1)

Country Link
JP (1) JPS5563149A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58223949A (en) * 1982-06-23 1983-12-26 Hitachi Ltd Automatic calling device
JPS58223947A (en) * 1982-06-23 1983-12-26 Hitachi Ltd System for checking transmission of dial signal
JPS58223948A (en) * 1982-06-23 1983-12-26 Hitachi Ltd PB signal conversion check method
JPH0450681Y2 (en) * 1986-03-25 1992-11-30

Also Published As

Publication number Publication date
JPS5563149A (en) 1980-05-13

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