JPH0520223A - Serial communication control circuit - Google Patents

Serial communication control circuit

Info

Publication number
JPH0520223A
JPH0520223A JP3175266A JP17526691A JPH0520223A JP H0520223 A JPH0520223 A JP H0520223A JP 3175266 A JP3175266 A JP 3175266A JP 17526691 A JP17526691 A JP 17526691A JP H0520223 A JPH0520223 A JP H0520223A
Authority
JP
Japan
Prior art keywords
serial communication
board
main control
output signal
control 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
JP3175266A
Other languages
Japanese (ja)
Inventor
Masato Tokishige
正人 時重
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.)
Sharp Corp
Original Assignee
Sharp 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 Sharp Corp filed Critical Sharp Corp
Priority to JP3175266A priority Critical patent/JPH0520223A/en
Publication of JPH0520223A publication Critical patent/JPH0520223A/en
Pending legal-status Critical Current

Links

Landscapes

  • Control Or Security For Electrophotography (AREA)
  • Test And Diagnosis Of Digital Computers (AREA)

Abstract

PURPOSE:To detect the falling of a connection terminal by connecting the final output signal line of a peripheral driving board to the input port of a main control board. CONSTITUTION:In a circuit connecting the main control board to plural peripheral driving boards 2 to 4 in series, the final output signal line of the board 4 is connected to the input port 12 of the board 1. Namely a serial communication data output signal outputted from the board 1 is compared with the final serial communication data signal. Thereby, whether each connection terminal falls off or not can be judged in accordance with the discrepancy/coincidence between the output signal and the input signal. Since the judged result is displayed at the occurrence of a trouble, the service and maintenance of this system can be improved.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】この発明は、複写機などの自己診
断などに用いられるシリアル通信制御回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a serial communication control circuit used for self-diagnosis of a copying machine or the like.

【０００２】[0002]

【従来の技術】一般に、複写機などでは、各部品装置の
動作不良や故障などに備えて自己診断機能を備えてい
る。各部品装置の動作状態を検知するセンサ群を配置
し、制御部に入力されるセンサ群からの信号を予め記憶
されている正常値と比較し、それが異なっている場合に
交換または補修が必要であると診断する。その構成は、
メイン制御基板と周辺のドライブ基板とをシリアル通信
で接続したものが、一般的である。トラブル発生の場合
は、本体上の表示装置に不良箇所などが表示され、サー
ビス性の向上が図られている。2. Description of the Related Art Generally, a copying machine or the like has a self-diagnosis function in case of malfunction or failure of each component device. A sensor group that detects the operating state of each component device is arranged, and the signals from the sensor group that are input to the control unit are compared with prestored normal values, and if they differ, replacement or repair is required. To diagnose. Its composition is
Generally, a main control board and peripheral drive boards are connected by serial communication. When a trouble occurs, a defective portion is displayed on the display device on the main body to improve serviceability.

【０００３】[0003]

【発明が解決しようとする課題】しかしながら、従来の
シリアル通信制御回路では、接続端子脱落（コネクタ抜
け）などが起こった場合、その検知の手段がなく、動作
不良として認知されていた。従ってその場合には自己診
断することができず、動作不良の原因を突き止めるのが
困難であった。However, in the conventional serial communication control circuit, when the connection terminal is dropped (connector is disconnected), there is no means for detecting it and it is recognized as a malfunction. Therefore, in that case, the self-diagnosis cannot be performed, and it is difficult to find the cause of the malfunction.

【０００４】そこでこの発明の目的は、接続端子脱落を
検知できるシリアル通信制御回路を提供することにあ
る。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a serial communication control circuit capable of detecting a dropout of a connection terminal.

【０００５】[0005]

【課題を解決するための手段】この発明では、メイン制
御基板と周辺ドライブ基板とを直列に接続したシリアル
通信制御回路において、前記周辺ドライブ基板の最終出
力信号線を前記メイン制御基板の入力ポートに接続した
ことを特徴とする。According to the present invention, in a serial communication control circuit in which a main control board and a peripheral drive board are connected in series, a final output signal line of the peripheral drive board is connected to an input port of the main control board. It is characterized by being connected.

【０００６】[0006]

【作用】この発明に係るシリアル通信制御回路では、メ
イン制御基板と周辺ドライブ基板とを直列に接続し、周
辺ドライブ基板の最終出力信号線をメイン制御基板の入
力ポートに接続した。これにより、メイン制御基板から
出力したシリアル通信データの出力信号と、各ドライブ
基板を回ってメイン制御基板に入力された最終のシリア
ル通信データの信号とを比較できる。信号が異なる場合
は接続端子脱落（コネクタ抜け）と判断する。In the serial communication control circuit according to the present invention, the main control board and the peripheral drive board are connected in series, and the final output signal line of the peripheral drive board is connected to the input port of the main control board. As a result, the output signal of the serial communication data output from the main control board and the final serial communication data signal input to the main control board around each drive board can be compared. If the signals are different, it is determined that the connection terminal has been dropped (connector disconnected).

【０００７】[0007]

【実施例】図１は、この発明の実施例であるシリアル通
信制御回路のブロック図である。1 is a block diagram of a serial communication control circuit according to an embodiment of the present invention.

【０００８】シリアル通信制御回路１０はメイン制御基
板１より第１ドライブ基板２、第２ドライブ基板３、・
・・第ｎドライブ基板３が直列に接続されている。そし
て最終の第ｎドライブ基板３からの出力信号がメイン制
御基板１に入力するように接続されている。シリアル通
信のデータはメイン制御基板１の出力ポート１１から次
の第１ドライブ基板２へと出力される。第１ドライブ基
板２はその入力したデータをそのまま次の第２ドライブ
基板３へとそのまま出力する。そして最終の第ｎドライ
ブ基板３の出力信号はメイン制御基板１の入力ポート１
１へと入力される。The serial communication control circuit 10 includes a main drive board 1, a first drive board 2, a second drive board 3 ,.
..The nth drive board 3 is connected in series. The final output signal from the nth drive board 3 is connected to the main control board 1. Serial communication data is output from the output port 11 of the main control board 1 to the next first drive board 2. The first drive board 2 outputs the input data as it is to the next second drive board 3. The final output signal of the nth drive board 3 is the input port 1 of the main control board 1.
Input to 1.

【０００９】以上のような構成で、回路の途中の一箇所
でも接続端子が脱落しているなど、不具合が生じると、
メイン制御基板１の出力ポート１１より出力した信号
と、入力ポート１２に入力した信号とが異なる。したが
って、信号が異なることにより接続端子の脱落を検知す
ることができる。With the above-mentioned structure, if a problem occurs such that the connection terminal is dropped even at one place in the circuit,
The signal output from the output port 11 of the main control board 1 is different from the signal input to the input port 12. Therefore, it is possible to detect the disconnection of the connection terminal due to the different signals.

【００１０】図２は、同シリアル通信制御回路における
接続端子脱落検知のフローチャートである。ｎ１でメイ
ン制御基板からの出力信号と、各ドライブ基板を通じて
入力された信号とを比較し、同じであれば不具合無と判
断し、異なっていれば接続端子脱落有と判断して接続端
子脱落の処理（表示手段による表示など）を行う（ｎ
２）。FIG. 2 is a flow chart for detecting the disconnection of the connection terminal in the serial communication control circuit. In n1, the output signal from the main control board is compared with the signal input through each drive board, and if they are the same, it is judged that there is no problem. Perform processing (display by display means, etc.) (n
2).

【００１１】[0011]

【発明の効果】以上のように、この発明によれば、シリ
アル通信制御回路においてメイン制御基板と周辺ドライ
ブ基板とを直列に接続し、周辺ドライブ基板の最終出力
信号線をメイン制御基板の入力ポートに接続したので、
メイン制御基板から出力したシリアル通信データの出力
信号と、各ドライブ基板を回ってメイン制御基板に入力
された最終のシリアル通信データの信号とを比較でき
る。比較の結果、出力信号と入力信号とが異なっている
か否かにより、それぞれ接続端子脱落有あるいは無と判
断できる。したがって判断結果を表示手段により表示す
れば、不具合が接続端子脱落に因るものとわかり、サー
ビス性および保守性の向上を図ることができる。As described above, according to the present invention, in the serial communication control circuit, the main control board and the peripheral drive board are connected in series, and the final output signal line of the peripheral drive board is connected to the input port of the main control board. Since I was connected to
The output signal of the serial communication data output from the main control board and the signal of the final serial communication data input to the main control board around each drive board can be compared. As a result of the comparison, it can be determined whether or not the connection terminal is dropped, depending on whether or not the output signal and the input signal are different. Therefore, if the determination result is displayed by the display means, it can be understood that the malfunction is caused by the disconnection of the connection terminal, and serviceability and maintainability can be improved.

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

【図１】この発明の実施例であるシリアル通信制御回路
のブロック図である。FIG. 1 is a block diagram of a serial communication control circuit that is an embodiment of the present invention.

【図２】同シリアル通信制御回路における接続端子脱落
検知のフローチャートである。FIG. 2 is a flowchart of detection of connection terminal disconnection in the serial communication control circuit.

【符号の説明】[Explanation of symbols]

１−メイン制御基板 ２−第１ドライブ基板 ３−第２ドライブ基板 ４−第３ドライブ基板 １０−シリアル通信制御回路 １１−出力ポート １２−入力ポート 1-Main control board 2-First drive board 3-Second drive board 4-Third drive board 10-Serial communication control circuit 11-Output port 12-Input port

Claims (1)

【特許請求の範囲】 【請求項１】 メイン制御基板と周辺ドライブ基板とを
直列に接続したシリアル通信制御回路において、 前記周辺ドライブ基板の最終出力信号線を前記メイン制
御基板の入力ポートに接続したことを特徴とするシリア
ル通信制御回路。Claim: What is claimed is: 1. A serial communication control circuit in which a main control board and a peripheral drive board are connected in series, wherein a final output signal line of the peripheral drive board is connected to an input port of the main control board. A serial communication control circuit characterized by the above.
JP3175266A 1991-07-16 1991-07-16 Serial communication control circuit Pending JPH0520223A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3175266A JPH0520223A (en) 1991-07-16 1991-07-16 Serial communication control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3175266A JPH0520223A (en) 1991-07-16 1991-07-16 Serial communication control circuit

Publications (1)

Publication Number Publication Date
JPH0520223A true JPH0520223A (en) 1993-01-29

Family

ID=15993148

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3175266A Pending JPH0520223A (en) 1991-07-16 1991-07-16 Serial communication control circuit

Country Status (1)

Country Link
JP (1) JPH0520223A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4945655A (en) * 1972-09-01 1974-05-01
JPS63161741A (en) * 1986-12-24 1988-07-05 Nec Corp Data transmission system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4945655A (en) * 1972-09-01 1974-05-01
JPS63161741A (en) * 1986-12-24 1988-07-05 Nec Corp Data transmission system

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