EP0095389A2
Expired / Lapsed
EP
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Data transmission system
Assignee: Sharp Corp
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Filing: 1983-05-25
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Granted: —
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Expires: 2003-05-25
Abstract
Abstract A very useful data transmission system having a plurality of transmission modules connected to a single cable in a multidrop manner is disclosed herein. The system features its ability to check the transmission state at the level of individual modules through use of a proper code notation (typically, Manchester code). The system treats a specific module with proper signals lasting at the same level for more than a given time except cable outputs, as involving a faulty condition and compels the transmission state to a halt, thus preventing only such a faulty module or modules from transmitting signals and avoiding breakdown of the whole system.
Inventors
- 👤 Masahiro Ise
- 👤 Hidehiko Tanaka
- 👤 Katsuyuki Machino
- 👤 Toshiyuki Matsubara
- 👤 Teiji Terasaka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 20:01
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/40; H04L12/407; H04L12/413; H04L1/00; H04L1/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
95 words
A data transmission system including a plurality of transmission modules connected to a single cable in a multidrop manner, each of said transmission modules comprising: means for generating codes 'which do not last at the same level for more than a given time even when the same data are transmitted continuously; means for monitoring the time where said codes last at the same level; and means for considering the subject module as faulty and compelling the transmission state to a halt If said last time as monitored by said monitoring means exceeds a predetermined time.
Claim 2
Dependent Claim
95 words
A data transmission system including a plurality of transmission modules connected to a single cable in a multidrop manner, each of said transmission modules comprising: means for generating codes 'which do not last at the same level for more than a given time even when the same data are transmitted continuously; means for monitoring the time where said codes last at the same level; and means for considering the subject module as faulty and compelling the transmission state to a halt If said last time as monitored by said monitoring means exceeds a predetermined time.
Claim 3
Dependent Claim
36 words
A data transmission system as set forth in claim 1 wherein a data "1" is defined by levels "1" and "0" in time sequence and a data "0" by levels "0" and "1" In time sequence.
Claim 4
Dependent Claim
17 words
A data transmission system as set forth In claim 1 wherein said codes are in Manchester notation.
Claim 5
Dependent Claim
23 words
A data transmission system as set forth In claim 1 wherein said given time is selected to be more than data bit time.
Claim 6
Dependent Claim
38 words
A data transmission system as set forth In claim 1 wherein said monitoring means includes a timer cleared whenever variation takes place in the level and keeping time-counting operation while the level of the transmission signal remains unchanged.
Claim 7
Dependent Claim
32 words
A data transmission system as set forth in claim 1 wherein data "1" and "0" are represented by the NRZ (Non Return to Zero) code notation and converted into the Manchester code.
Claim 8
Dependent Claim
91 words
A data transmission system comprising a plurality of data transmitters (2) having a common communication channel (1), characterised in that each transmitter (2) is arranged to transmit data in a format such that level transitions occur at least once in every predetermined interval, and further characterised in that the system has means (27,28) for monitoring the transmissions and for disabling any one of said transmitters (2) without' disabling the other transmitters (2) if, when said one transmitter (2) is transmitting, a level transition does not occur within a said predetermined interval.
Claim 9
Dependent Claim
91 words
A data transmission system comprising a plurality of data transmitters (2) having a common communication channel (1), characterised in that each transmitter (2) is arranged to transmit data in a format such that level transitions occur at least once in every predetermined interval, and further characterised in that the system has means (27,28) for monitoring the transmissions and for disabling any one of said transmitters (2) without' disabling the other transmitters (2) if, when said one transmitter (2) is transmitting, a level transition does not occur within a said predetermined interval.
Claim 10
Dependent Claim
40 words
A system as claimed in claim 7, wherein each said transmitter (2) has a respective monitoring and disabling means (27,28) for monitoring its transmissions and for disabling the transmitter if a level transition does not-occur within a said predetermined interval.
References Cited (Backward Citations)
No citation records indexed.
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