Data communication system having plural stations connected to a single transmission path
First Claim
1. A data management method for controlling the transfer of data in an information communication system in which a plurality of stations are operatively coupled to a same information transmission path and in which frames of data are transmitted among the plurality of stations on the information transmission path, each frame of data including a command region and a relevant data region, said method comprising:
- a step of analyzing at a receiving station a command region of a frame transmitted by a sending station on said information transmission path to determine if said command region denotes one of a data registration command, a data renewal command or a data transfer command;
a step of storing in a data memory of said receiving station the relevant data contained in said frame when said command region denotes the data registration command;
a step of overwriting previously stored relevant data of said sending station stored in said data memory of said receiving station with said relevant data contained in said frame when said command region denotes the data renewal command; and
a step of transmitting relevant data contents, specified in said frame of data, of said data memory of said receiving station on said information transmission path when said command region denotes the data transfer command.
1 Assignment
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Accused Products
Abstract
A data management method controls the transfer of data in a communication system in which a plurality of stations are coupled to a same data transmission path. Each of the stations operates in one of a master mode and a slave mode. In the master mode, a station transmits a frame of data on the data transmission path, the frame of data including an address designating a station which is to operate in the slave mode and a command designating functions to be carried out by the station designated to operate in the slave mode. In the slave mode, a station receives the frame of data transmitted by the station operating in the master mode, and carries out data processing in accordance with the command contained in the thus received frame of data.
34 Citations
4 Claims
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1. A data management method for controlling the transfer of data in an information communication system in which a plurality of stations are operatively coupled to a same information transmission path and in which frames of data are transmitted among the plurality of stations on the information transmission path, each frame of data including a command region and a relevant data region, said method comprising:
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a step of analyzing at a receiving station a command region of a frame transmitted by a sending station on said information transmission path to determine if said command region denotes one of a data registration command, a data renewal command or a data transfer command; a step of storing in a data memory of said receiving station the relevant data contained in said frame when said command region denotes the data registration command; a step of overwriting previously stored relevant data of said sending station stored in said data memory of said receiving station with said relevant data contained in said frame when said command region denotes the data renewal command; and a step of transmitting relevant data contents, specified in said frame of data, of said data memory of said receiving station on said information transmission path when said command region denotes the data transfer command.
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2. A data management method for controlling the transfer of data in an information communication system in which a plurality of stations are operatively coupled to a same information transmission path and in which frames of data are transmitted among the plurality of stations on the information transmission path, each frame of data including a command region and a relevant data region, said method comprising:
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a step of analyzing in a receiving station a command region of a frame transmitted by a sending station on said information transmission path to determine if said command region denotes one of a data registration command, a destination address registration command, a data renewal command or a data transfer command; a step of storing in a data memory of said receiving station the relevant data contained in said frame when said command region denotes the data registration command; a step of storing in said data memory of said receiving station a destination address contained in said frame when said command region denotes the destination address registration command, the thus stored destination address being associated with relevant data of said sending station stored in said data memory of said receiving station; a step of, when said command region denotes the data renewal command, overwriting previously stored relevant data of said sending station stored in said data memory of said receiving station with said relevant data contained in said frame to obtain stored renewed relevant data, determining if said previously stored relevant data have a destination address associated therewith, and transmitting said renewed relevant data to a station identified by said destination address when said previously stored relevant data have said destination address associated therewith; and a step of transmitting relevant data contents, specified in said frame of data, of said data memory of said receiving station on said information transmission path when said command region denotes the data transfer command.
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3. A data management method for controlling the transfer of data in an information communication system having a plurality of stations operatively coupled to a same data transmission path, said method comprising:
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storing respective inherent data in a data memory of each of said plurality of stations; selectively operating said plurality of stations in one of a master mode and a slave mode; said master mode including, (a) transmitting a frame of data on said data communication path, said frame of data including at least a slave address region designating one of said plurality of stations to operate in said slave mode and a command region designating processes to be carried by said one of said plurality of stations designated to operate in said slave mode, said frame of data further including inherent data when said inherent data is to be stored in said one of said plurality of stations designated to operate in said slave mode, and (b) receiving data transmitted on said data communication path from said one of said plurality of stations designated to operate in said slave mode; said slave mode including, (a) receiving said frame of data transmitted on said data communication path by a one of said plurality of stations operating in said master mode, (b) analyzing said command region of said frame of data transmitted on said data transmission path to determine if said command region denotes one of a data registration command, a data renewal command or a data transfer command; (c) storing in said data memory the inherent data contained in said frame of data when said command region denotes the data registration command, (d) overwriting previously stored inherent data contents of said data memory with said inherent data contained in said frame of data when said command region denotes the data renewal command, said previously stored inherent data contents associated with said one of said stations operating in said master mode, and (e) transmitting inherent data contents, specified in said frame of data, of said data memory on said data transmission path to said one of said plurality of stations operating in said master mode when said command region denotes the data transfer command.
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4. A data management method for controlling the transfer of data in an information communication system having a plurality of stations operatively coupled to a same data transmission path, said method comprising:
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storing respective inherent data in a data memory of each of said plurality of stations; selectively operating said plurality of stations in one of a master mode and a slave mode; said master mode including, (a) transmitting a frame of data on said data communication path, said frame of data including at least a slave address region designating one of said plurality of stations to operate in said slave mode and a command region designating processes to be carried by said one of said plurality of stations designated to operate in said slave mode, said frame of data further including inherent data when said inherent data is to be stored in said one of said plurality of stations designated to operate in said slave mode, and (b) receiving data transmitted on said data communication path from said one of said plurality of stations designated to operate in said slave mode; said slave mode including, (a) receiving said frame of data transmitted on said data communication path by a one of said plurality of stations operating in said master mode, (b) analyzing the command region of said frame of data transmitted on said data transmission path to determine if said command region denotes one of data registration command, a destination address registration command, a data renewal command or a data transfer command, (c) storing in said data memory the inherent data contained in said frame of data when said command region denotes the data registration command, (d) storing in said data memory a destination address contained in said frame of data when said command region denotes the destination address registration command, the thus stored destination address being associated with inherent data stored in said data memory, (e) when said command region denotes the data renewal command, overwriting previously stored inherent data contents of said data memory with said inherent data contained in said frame of data to obtain stored renewed inherent data, said previously stored inherent data contents associated with said one of said plurality of stations operating in said master mode, determining if said previously stored inherent data contents have a destination address associated therewith, and transmitting said renewed inherent data to a station identified by said destination address when said previously stored inherent data contents have said destination address associated therewith, and, (f) transmitting inherent data contents, specified in said frame of data, of said data memory on said data transmission path when said command region denotes the data transfer command.
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Specification