JPS6444656A - Data communication system - Google Patents

Data communication system

Info

Publication number
JPS6444656A
JPS6444656A JP62202084A JP20208487A JPS6444656A JP S6444656 A JPS6444656 A JP S6444656A JP 62202084 A JP62202084 A JP 62202084A JP 20208487 A JP20208487 A JP 20208487A JP S6444656 A JPS6444656 A JP S6444656A
Authority
JP
Japan
Prior art keywords
data
terminal equipment
reception
side terminal
signal
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
JP62202084A
Other languages
Japanese (ja)
Inventor
Junichi Suzuki
Hisataka Fujii
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.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works 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 Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP62202084A priority Critical patent/JPS6444656A/en
Publication of JPS6444656A publication Critical patent/JPS6444656A/en
Pending legal-status Critical Current

Links

Landscapes

  • Detection And Prevention Of Errors In Transmission (AREA)
  • Bidirectional Digital Transmission (AREA)
  • Communication Control (AREA)

Abstract

PURPOSE:To quickly transmit emergency data which occurs in a reception-side terminal equipment, by transmitting an emergency transmission request signal having a specific frequency from the reception-side terminal equipment at the time of occurrence of emergency data to be transmitted on the way of data reception and stopping data transmission in a data reception-side terminal equipment at the time of detecting this signal. CONSTITUTION:Though a data signal VA' in the low level leaked to the four- wire reception side is outputted during data transmission, outputs of level detectors 14a and 14b go to the low level if the reference level of level detectors 14a and 14b is properly set. If an emergency transmission request signal VB is received, signals of 941Hz and 1336Hz are considerably larger than the leaked data signal VA', and outputs of level detectors 14a and 14b go to the high level and the output of an AND circuit 15 goes to the high level also to output the detection signal of the response signal VB. Then, a data transmission-side terminal equipment A stops data transmission and emergency data VC transmitted from a reception-side terminal equipment B is received by the transmission-side terminal equipment A.
JP62202084A 1987-08-13 1987-08-13 Data communication system Pending JPS6444656A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62202084A JPS6444656A (en) 1987-08-13 1987-08-13 Data communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62202084A JPS6444656A (en) 1987-08-13 1987-08-13 Data communication system

Publications (1)

Publication Number Publication Date
JPS6444656A true JPS6444656A (en) 1989-02-17

Family

ID=16451698

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62202084A Pending JPS6444656A (en) 1987-08-13 1987-08-13 Data communication system

Country Status (1)

Country Link
JP (1) JPS6444656A (en)

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