EP0385431A2
Expired / Lapsed
EP
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Polling communication system
Assignee: Fujitsu Ltd
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Filing: 1990-02-28
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Granted: —
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Expires: 2010-02-28
Abstract
Abstract A communication system containing a master station (10), a plurality of slave stations (20₁, 20₂, ... 20 n-1 , 20 n ), a transmission line (30, 40) for transmitting a signal between the master station and the plurality of slave stations. The master station contains: a request sending allowance signal sending circuit (35) for sending a request sending allowance signal which addresses one of the plurality of slave stations to give an allowance to send a request for sending data, on transmission line; a request receiving circuit (31) for receiving a request from one of the plurality of slave stations; a request memorizing circuit (34) for memorizing one or more requests from one or more slave stations; and a data sending allowance signal sending circuit (34) for sending a data sending allowance signal which addresses one of the plurality of slave stations to give an allowance to send data, on the transmission line, according to a request which is memorized in the request memorizing circuit. Each of the slave stations comprises: a request sending allowance signal detecting circuit (45) for detecting a request sending allowance signal which addresses its own slave station, on the transmission line; a data sending allowance signal detecting circuit (44) for detecting a data sending allowance signal which addresses its own slave station, on the transmission line; a request sending circuit (45) for sending a request for sending data on the transmission line to the master station when its own slave station detects a request sending allowance signal which addresses its own slave station; and a data sending circuit (44, 43) for sending data on the transmission line to the master station when its own slave station detects a data sending allowance signal which addresses its own slave station.
Inventors
- 👤 Shigeo Amemiya
- 👤 Koji Fujitsu Dai-12 Nakahara-Ryo Tezuka
- 👤 Tomohiro Copo Haiburijji 102 Shinomiya
- 👤 Hiroshi Mezon Sano 202 Takeo
- 👤 Tetsuo Soejima
- 👤 Kazuo Iguchi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 17:28
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/40; H04L12/40143; H04L12/403
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
304 words
A communication system comprising: a master station (10); a plurality of slave stations (20₁, 20₂, ... 20 n-1 , 20 n ); a transmission line (30, 40) for transmitting a signal between said master station and said plurality of slave stations; said master station (10) comprises, a request sending allowance signal sending means (35) for sending a request sending allowance signal which addresses one of said plurality of slave stations to give an allowance to send a request for sending data, on said transmission line, a request receiving means (31) for receiving a request from one of said plurality of slave stations, a request memorizing means (34) for memorizing one or more requests from one or more slave stations, and a data sending allowance signal sending means (34) for sending a data sending allowance signal which addresses one of said plurality of slave stations to give an allowance to send data, on said transmission line, according to a request which is memorized in said request memorizing means, each of said slave stations (20₁, 20₂, ... 20 n-1 , 20 n ) comprises, a request sending allowance signal detecting means (45) for detecting a request sending allowance signal which addresses its own slave station, on said transmission line, a data sending allowance signal detecting means (44) for detecting a data sending allowance signal which addresses its own slave station, on said transmission line, a request sending means (45) for sending a request for sending data on said transmission line to said master station when its own slave station detects a request sending allowance signal which addresses its own slave station, and a data sending means (44, 43) for sending data on said transmission line to said master station when its own slave station detects a data sending allowance signal which addresses its own slave station.
Claim 2
Dependent Claim
304 words
A communication system comprising: a master station (10); a plurality of slave stations (20₁, 20₂, ... 20 n-1 , 20 n ); a transmission line (30, 40) for transmitting a signal between said master station and said plurality of slave stations; said master station (10) comprises, a request sending allowance signal sending means (35) for sending a request sending allowance signal which addresses one of said plurality of slave stations to give an allowance to send a request for sending data, on said transmission line, a request receiving means (31) for receiving a request from one of said plurality of slave stations, a request memorizing means (34) for memorizing one or more requests from one or more slave stations, and a data sending allowance signal sending means (34) for sending a data sending allowance signal which addresses one of said plurality of slave stations to give an allowance to send data, on said transmission line, according to a request which is memorized in said request memorizing means, each of said slave stations (20₁, 20₂, ... 20 n-1 , 20 n ) comprises, a request sending allowance signal detecting means (45) for detecting a request sending allowance signal which addresses its own slave station, on said transmission line, a data sending allowance signal detecting means (44) for detecting a data sending allowance signal which addresses its own slave station, on said transmission line, a request sending means (45) for sending a request for sending data on said transmission line to said master station when its own slave station detects a request sending allowance signal which addresses its own slave station, and a data sending means (44, 43) for sending data on said transmission line to said master station when its own slave station detects a data sending allowance signal which addresses its own slave station.
Claim 3
Dependent Claim
53 words
A communication system according to claim 1, wherein said transmission line comprises, a downstream line (40) for transmitting a signal from said master station to said plurality of slave stations; and an upstream line (30) for transmitting a signal from one or more of said plurality of slave stations to said master station.
Claim 4
Dependent Claim
66 words
A communication system according to claim 1, wherein each of said slave stations further comprises an additional request sending means (65) for sending an additional request for sending a further data on the transmission line to said master station when its own slave station detects a data sending allowance signal which addresses its own slave station, and sends data corresponding to the data sending allowance signal.
Claim 5
Dependent Claim
31 words
A communication system according to claim 3, wherein said master station further comprises an additional request detecting means (87) for detecting said additional request which is sent from a slave station.
Claim 6
Dependent Claim
47 words
A communication system according to claim 4, wherein said data sending allowance signal sending means (87, 86, 84) in said master station sends with first priority a data sending allowance signal to a slave station which has sent said additional request, when said additional request is detected.
Claim 7
Dependent Claim
63 words
A communication system according to claim 5, wherein said data sending allowance signal sending means comprises, a successive allowances limiting means (87) for changing an address of said data sending allowance signal to another slave station from which a request for sending data is memorized in said request memorizing means, when a predetermined number of successive allowances are output to a slave station.
Claim 8
Dependent Claim
138 words
A communication system according to claim 5, wherein a priority is assigned for each of said slave stations regarding a data sending operation, said data sending allowance signal sending means comprises, a priority comparing means (129, 129′, 145, 145′) for comparing the priority of a slave station to which a data sending allowance signal is currently output, with a priority of a slave station from which a request for sending data is received, and an address changing means (127, 143) for changing an address of said data sending allowance signal to said slave station from which said request for sending data is received, when the priority of the slave station to which a data sending allowance signal is currently output, is lower than the priority of said slave station from which said request for sending data is received.
Claim 9
Dependent Claim
34 words
A communication system according to claim 7, wherein each of said request and said additional request includes information of the priority of said slave station from which said request for sending data is output.
Claim 10
Dependent Claim
106 words
A communication system according to claim 1, wherein a priority is assigned for each of said slave stations regarding a data sending operation, each of said plurality of slave stations further comprises a priority signal output means for outputting said assigned priority when sending said request for sending data, on said transmission line, said request memorizing means (114, 88, 89) in the master station further memorizes said priority for each request memorized therein, and said data sending allowance signal sending means (114) sends the data sending allowance signals in the order of the priorities of the slave stations which are memorized in said request memorizing means.
Claim 11
Dependent Claim
34 words
A communication system according to claim 1, wherein said master station further comprises a polling address dispersing means for dispersing the addresses of said request sending allowance signal and said data sending allowance signal.
Claim 12
Dependent Claim
40 words
A communication system according to claim 10, wherein said polling address dispersing means (701 - 703) makes polling addresses in said request sending allowance signal and said data sending allowance signal in a current polling cycle different from each other.
Claim 13
Dependent Claim
80 words
A communication system according to claim 10, wherein said polling address dispersing means comprises a preceding polling address memorizing means (721 - 725) for memorizing polling addresses in a predetermined number of preceding polling cycles, and a polling address control means for making polling addresses in said request sending allowance signal and said data sending allowance signal in a current polling cycle different from each other and different from the polling addresses in said predetermined number of preceding polling cycles.
Claim 14
Dependent Claim
45 words
A communication system according to claim 1, wherein said master station further comprises a polling address controlling means for making the address of said data sending allowance signal equal to said request sending allowance signal when no request is memorized in said request memorizing means.
Claim 15
Dependent Claim
35 words
A communication system according to claim 1, wherein said request sending allowance signal sending means sends said request sending allowance signals at a lower frequency than the frequency said data sending allowance signals are sent.
Claim 16
Dependent Claim
325 words
A communication system comprising: a master station (10); a plurality of slave stations (20₁, 20₂, ... 20 n-1 , 20 n ); a transmission line (30, 40) for transmitting a between said master station and said plurality of slave stations; said master station comprises, a requested quantity sending allowance signal sending means (35′) for sending a requested quantity sending allowance signal which addresses one of said plurality of slave stations to give an allowance to send a quantity of data requested to be sent, on said transmission line, a data quantity receiving means (31′) for receiving said quantity of data from one of said plurality of slave stations, a requested quantity memorizing means (34′) for memorizing one or more quantities of data from one or more slave stations, and a data sending allowance signal sending means (34′) for sending a data sending allowance signal which addresses one of said plurality of slave stations to give an allowance to send data, on said transmission line, according to a data quantity which is sent from the slave station, and which is memorized in said request memorizing means, each of said slave stations comprises, a requested quantity sending allowance signal detecting means (45′) for detecting a requested quantity sending allowance signal which addresses its own slave station, on said transmission line, a data sending allowance signal detecting means (44′) for detecting a data sending allowance signal which addresses its own slave station, on said transmission line, a requested data quantity sending means (45′) for sending a quantity of data requested to be sent from its own slave station, on said transmission line to said master station when its own slave station detects a requested quantity sending allowance signal which addresses its own slave station, and a data sending means (44′) for sending data on said transmission line to said master station when its own slave station detects a data sending allowance signal which addresses its own slave station.
Claim 17
Dependent Claim
325 words
A communication system comprising: a master station (10); a plurality of slave stations (20₁, 20₂, ... 20 n-1 , 20 n ); a transmission line (30, 40) for transmitting a between said master station and said plurality of slave stations; said master station comprises, a requested quantity sending allowance signal sending means (35′) for sending a requested quantity sending allowance signal which addresses one of said plurality of slave stations to give an allowance to send a quantity of data requested to be sent, on said transmission line, a data quantity receiving means (31′) for receiving said quantity of data from one of said plurality of slave stations, a requested quantity memorizing means (34′) for memorizing one or more quantities of data from one or more slave stations, and a data sending allowance signal sending means (34′) for sending a data sending allowance signal which addresses one of said plurality of slave stations to give an allowance to send data, on said transmission line, according to a data quantity which is sent from the slave station, and which is memorized in said request memorizing means, each of said slave stations comprises, a requested quantity sending allowance signal detecting means (45′) for detecting a requested quantity sending allowance signal which addresses its own slave station, on said transmission line, a data sending allowance signal detecting means (44′) for detecting a data sending allowance signal which addresses its own slave station, on said transmission line, a requested data quantity sending means (45′) for sending a quantity of data requested to be sent from its own slave station, on said transmission line to said master station when its own slave station detects a requested quantity sending allowance signal which addresses its own slave station, and a data sending means (44′) for sending data on said transmission line to said master station when its own slave station detects a data sending allowance signal which addresses its own slave station.
Claim 18
Dependent Claim
135 words
A communication system according to claim 15, wherein said master station further comprises, a history memory means for memorizing a history of said data sending allowance signals which are output in a time duration, and said time duration is predetermined corresponding to a time from a moment a requested quantity sending allowance signal is output from said master station, to a moment a slave station addressed by the requested quantity sending allowance signal detects the requested quantity sending allowance signal, and a memorized quantity correcting means (731 - 735) for subtracting a quantity corresponding to a number of data sending allowance signals to a slave station, which are memorized in said history memory, from said quantity of data which is received from the slave station, before storing the quantity in said requested quantity memorizing means.
Claim 19
Dependent Claim
65 words
A communication system according to claim 15, wherein each of said slave stations further comprises an additional request sending means for sending an additional request for sending a further data on the transmission line to said master station when its own slave station detects a data sending allowance signal which addresses its own slave station, and sends data corresponding to the data sending allowance signal.
Claim 20
Dependent Claim
30 words
A communication system according to claim 17, wherein said master station further comprises an additional request detecting means for detecting said additional request which is sent from a slave station.
Claim 21
Dependent Claim
44 words
A communication system according to claim 18, wherein said data sending allowance signal sending means in said master station sends with first priority a data sending allowance signal to a slave station which has sent said additional request, when said additional request is detected.
Claim 22
Dependent Claim
62 words
A communication system according to claim 19, wherein said data sending allowance signal sending means comprises, a successive allowances limiting means for changing an address of said data sending allowance signal to another slave station from which a request for sending data is memorized in said request memorizing means, when a predetermined number of successive allowances are output to a slave station.
Claim 23
Dependent Claim
147 words
A communication system according to claim 18, wherein a priority is assigned for each of said slave stations regarding a data sending operation, said data sending allowance signal sending means comprises, a priority comparing means (129, 129′, 145, 145′) for comparing the priority of a slave station to which a data sending allowance signal is currently output, with a priority of a slave station from which a quantity of data requested to be sent is received, and an address changing means (127, 143) for changing an address of said data sending allowance signal to said slave station from which said quantity of data requested to be sent is received, when the priority of the slave station to which a data sending allowance signal is currently output, is lower than the priority of said slave station from which said quantity of data requested to be sent is received.
Claim 24
Dependent Claim
41 words
A communication system according to claim 21, wherein each of said quantity of data requested to be sent and said additional request further includes information of the priority of said slave station from which said request for sending data is output.
Claim 25
Dependent Claim
109 words
A communication system according to claim 15, wherein a priority is assigned for each of said slave stations regarding a data sending operation, each of said plurality of slave stations further comprises a priority signal output means for outputting said assigned priority when sending said quantity of data requested to be sent, on said transmission line, said request memorizing means (114, 88, 89) in the master station further memorizes said priority for each request memorized therein, and said data sending allowance signal sending means (114) sends the data sending allowance signals in the order of the priorities of the slave stations which are memorized in said request memorizing means.
Claim 26
Dependent Claim
35 words
A communication system according to claim 15, wherein said master station further comprises a polling address dispersing means for dispersing the addresses of said requested quantity sending allowance signal and said data sending allowance signal.
Claim 27
Dependent Claim
41 words
A communication system according to claim 24, wherein said polling address dispersing means (701 - 703) makes polling addresses in said requested quantity sending allowance signal and said data sending allowance signal in a current polling cycle different from each other.
Claim 28
Dependent Claim
81 words
A communication system according to claim 25, wherein said polling address dispersing means comprises a preceding polling address memorizing means for memorizing polling addresses in a predetermined number of preceding polling cycles, and a polling address control means (721 - 725) for making polling addresses in said requested quantity sending allowance signal and said data sending allowance signal in a current polling cycle different from each other and different from the polling addresses in said predetermined number of preceding polling cycles.
Claim 29
Dependent Claim
47 words
A communication system according to claim 15, wherein said master station further comprises a polling address controlling means for making the address of said data sending allowance signal equal to said requested quantity sending allowance signal when no request is memorized in said requested quantity memorizing means.
Claim 30
Dependent Claim
37 words
A communication system according to claim 15, wherein said requested quantity sending allowance signal sending means sends said requested quantity sending allowance signals at a lower frequency than the frequency said data sending allowance signals are sent.
References Cited (Backward Citations)
No citation records indexed.
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