JPS54110706A - Data terminal device - Google Patents

Data terminal device

Info

Publication number
JPS54110706A
JPS54110706A JP1761978A JP1761978A JPS54110706A JP S54110706 A JPS54110706 A JP S54110706A JP 1761978 A JP1761978 A JP 1761978A JP 1761978 A JP1761978 A JP 1761978A JP S54110706 A JPS54110706 A JP S54110706A
Authority
JP
Japan
Prior art keywords
communication
circuit
terminal device
central device
transmits
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.)
Granted
Application number
JP1761978A
Other languages
Japanese (ja)
Other versions
JPS5759972B2 (en
Inventor
Toshiro Tokita
Tomoharu Maehara
Shigeo Kikuta
Akio Otani
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP1761978A priority Critical patent/JPS54110706A/en
Publication of JPS54110706A publication Critical patent/JPS54110706A/en
Publication of JPS5759972B2 publication Critical patent/JPS5759972B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Detection And Prevention Of Errors In Transmission (AREA)
  • Maintenance And Management Of Digital Transmission (AREA)

Abstract

PURPOSE: To secure the automatic transmission again for the data to the central device and thus to start the communication operation without ending the communication in case the normal communication is lost for the data terminal device of automatic control with the central device.
CONSTITUTION: In case the error is detected in the answerinformation given from the central device even after counting of the fixed times, communication state decision part 18 judges the abnormal communication state and informs the abnormal state to control circuit 11. Circuit 11 transmits the contents memorized temporarily in request information memory part 9 newly from transmission circuit 10 via data line L1. Thus, the request information is transmitted to central device 1 from circuit 10. Device 1 has the similar operation to that of the previous time and produces the answer information to transmit it to terminal device 5 from transmission circuit 4 via data line L2. When no error is detected in the answer information, device 5 transmits the ACK code to device 1 as the answer signal to complete the communication.
COPYRIGHT: (C)1979,JPO&Japio
JP1761978A 1978-02-20 1978-02-20 Data terminal device Granted JPS54110706A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1761978A JPS54110706A (en) 1978-02-20 1978-02-20 Data terminal device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1761978A JPS54110706A (en) 1978-02-20 1978-02-20 Data terminal device

Publications (2)

Publication Number Publication Date
JPS54110706A true JPS54110706A (en) 1979-08-30
JPS5759972B2 JPS5759972B2 (en) 1982-12-17

Family

ID=11948884

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1761978A Granted JPS54110706A (en) 1978-02-20 1978-02-20 Data terminal device

Country Status (1)

Country Link
JP (1) JPS54110706A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0548676A (en) * 1991-12-18 1993-02-26 Hitachi Ltd Data transmission system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59153978A (en) * 1983-02-18 1984-09-01 Toyota Motor Corp Control method of ignition timing in knock controlled engine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0548676A (en) * 1991-12-18 1993-02-26 Hitachi Ltd Data transmission system

Also Published As

Publication number Publication date
JPS5759972B2 (en) 1982-12-17

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