JPS5487444A - Direct-current data transmitter - Google Patents

Direct-current data transmitter

Info

Publication number
JPS5487444A
JPS5487444A JP15623577A JP15623577A JPS5487444A JP S5487444 A JPS5487444 A JP S5487444A JP 15623577 A JP15623577 A JP 15623577A JP 15623577 A JP15623577 A JP 15623577A JP S5487444 A JPS5487444 A JP S5487444A
Authority
JP
Japan
Prior art keywords
power
lines
transmission lines
equipments
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.)
Granted
Application number
JP15623577A
Other languages
Japanese (ja)
Other versions
JPS576309B2 (en
Inventor
Ryohei Kawasaki
Nobuo Yasuda
Makoto Kawai
Toshikazu Katsuki
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.)
Omron Corp
Original Assignee
Omron Tateisi Electronics Co
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 Omron Tateisi Electronics Co filed Critical Omron Tateisi Electronics Co
Priority to JP15623577A priority Critical patent/JPS5487444A/en
Publication of JPS5487444A publication Critical patent/JPS5487444A/en
Publication of JPS576309B2 publication Critical patent/JPS576309B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Dc Digital Transmission (AREA)
  • Small-Scale Networks (AREA)
  • Selective Calling Equipment (AREA)

Abstract

PURPOSE: To improve a S/N ratio with interference among units eliminated, by electrically insulating transmission lines from respective units by the use of a photo coupler and by driving transmission control parts, data reception parts and transmission lines by respectively-independent power supplies.
CONSTITUTION: The equipment which transmits data between several terminal equipments T1, T2...Tn and the CPU on a multi-drop system is provided with a couple of transmission lines 5 and 5' which share equipments T1, T2...Tn, and also equipped with transmitting power supply PS of an independent DC power supply which supplies power driving lines 5 and 5' corresponding to data outputted from equipment T1 and other equipments T2...Tn and a couple of power lines 7 and 7' supplying this power. Then, current-direction change-over circuit 16 is provided which composed of a semiconductor bridge circuit making a changeover between positive and negative currents flowing to transmission lines 5 and 5' when a direct current is applied to line 7 and 7', and transmission control part 8 is also provided which is provided with power-application selector circuit 17 isolated from lines 7 and 7' by the photo coupler controlling circuit 16.
COPYRIGHT: (C)1979,JPO&Japio
JP15623577A 1977-12-23 1977-12-23 Direct-current data transmitter Granted JPS5487444A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15623577A JPS5487444A (en) 1977-12-23 1977-12-23 Direct-current data transmitter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15623577A JPS5487444A (en) 1977-12-23 1977-12-23 Direct-current data transmitter

Publications (2)

Publication Number Publication Date
JPS5487444A true JPS5487444A (en) 1979-07-11
JPS576309B2 JPS576309B2 (en) 1982-02-04

Family

ID=15623315

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15623577A Granted JPS5487444A (en) 1977-12-23 1977-12-23 Direct-current data transmitter

Country Status (1)

Country Link
JP (1) JPS5487444A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61270941A (en) * 1985-05-27 1986-12-01 Matsushita Electric Works Ltd Displaying device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61270941A (en) * 1985-05-27 1986-12-01 Matsushita Electric Works Ltd Displaying device

Also Published As

Publication number Publication date
JPS576309B2 (en) 1982-02-04

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