JPS5487444A - Direct-current data transmitter - Google Patents
Direct-current data transmitterInfo
- 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
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
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61270941A (en) * | 1985-05-27 | 1986-12-01 | Matsushita Electric Works Ltd | Displaying device |
-
1977
- 1977-12-23 JP JP15623577A patent/JPS5487444A/en active Granted
Cited By (1)
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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