Multiplex communications – Channel assignment techniques – Polling
Reexamination Certificate
1998-05-27
2001-10-09
Vu, Huy D. (Department: 2662)
Multiplex communications
Channel assignment techniques
Polling
C370S400000, C370S406000, C370S432000, C370S452000, C370S475000, C370S410000
Reexamination Certificate
active
06301261
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a communication system which is arranged by connecting a plurality of communication devices through a data transmission line and exchanges data between the communication devices, more specifically, relates to a communication method and communication system in which when communication data are transmitted from an arbitrary originating source communication device to the other plural destination communication devices and the originating source communication device receives responses including receiving states of the respective destination communication devices, the originating source communication device can receive all the responses from the respective destination communication devices securely without conflict of the responses.
2. Description of the Related Art
There is known a communication system which is arranged by connecting a plurality of communication devices through a data transmission line and exchanges data between the communication devices.
The above conventional communication system is occasionally required to multiply transmit communication data suitably including various commands and control information from an arbitrary communication device to the other plural communication devices. In this case, for example, inherent multiple addresses such as “FF” are preset as for plural destination communication devices which are prescribed multiple destinations of the communication data to be transmitted in this time. The arbitrary communication device which is a transmission source adds the multiple addresses “FF” as destinations of the communication data to be transmitted in this time, and transmits the communication data to which the multiple addresses were added to the destination communication devices whose multiple addresses “FF” are set. Then, the respective destination communication devices judge as to whether or not the multiple addresses “FF” added to the communication data coincide with the self multiple addresses, and when as a result of the judgment, the multiple addresses “FF” coincide with the self multiple addresses, namely, when the respective destination communication devices are specified as the multiple addresses, a process for capturing the communication data into the respective destination communication devices is performed. Furthermore, the responses including receiving states of the respective destination communication devices are transmitted back to the originating source communication device so that when the capturing of the communication data is succeeded, acknowledgment (ACK) is transmitted back, whereas when the capturing of the communication data is failed, negative acknowledgment (NAK) is transmitted back.
However, according to the aforementioned communication method in the conventional communication system, when one originating source communication device receives responses including receiving states of plural destination communication devices, if the respective responses are overlapped at the same time, it is difficult that the originating source communication device receives all the responses from the destination communication devices securely due to conflict of the responses. Namely, this method has such a problem which should be solved.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a communication method and communication system in which when communication data are transmitted from an arbitrary originating source communication device to the other plural destination communication devices and the originating source communication device receives responses including receiving states of the respective destination communication devices, the originating source communication device can receive all the responses from the respective destination communication devices securely without conflict of the responses.
In order to solve the above problems, from a first aspect of the present invention, there is provided a communication method used in a communication system arranged by connecting a plurality of communication devices through a data transmission line, the method of transmitting communication data from an arbitrary originating source communication device to the other plural destination communication devices, the method comprising the steps of: including in the communication data at least destinations of the communication data, an originating source of the communication data and a destination identifier used for identifying next destinations of the communication data when the communication data circulate in the plural destination communication devices; providing the respective communication devices with next address storage means for previously storing next addresses representing next destinations of the communication data according to description contents of the destination identifier therein; transmitting the communication data from the originating source communication device to one of the plural destination communication devices; making responses including transmitting states of the communication data from the respective destination communication devices to the originating source communication device when the respective destination communication devices receives the communication data; changing the next destination of the communication data into a next address read from the next address storage means according to the description contents of the destination identifier; and transmitting the communication data whose destination was changed to the communication device corresponding to the next address after making the response.
According to the first aspect of the invention, an arbitrary originating source communication device transmits the communication data to one of the other plural destination communication devices. When receiving the communication data, the respective destination communication devices which receive the transmitted communication data make responses including receiving states of the communication data to the originating source communication device, and thereafter change a next destination of the communication data into a next address according to the description contents of the destination identifier read from the next address storage means so as to transmit the communication data whose destination was changed to the communication device corresponding to the next address.
Accordingly, a next address representing a next destination of the communication data according to the description contents of the destination identifier is previously stored in the next address storage means owned by the respective communication devices, and when receiving the communication data, the respective destination communication devices make responses including the receiving states of the communication data to the originating source communication device, and thereafter, change the next destination of the communication data into the next address according to the description contents of the destination identifier read from the next address storage means so as to transmit the communication data whose destination was changed to the communication data corresponding to the next address. For this reason, when the communication data are transmitted from an arbitrary originating source communication device to the other plural destination communication devices and the originating source communication device receives the responses including the receiving states of the respective destination communication devices, time overlapping of the responses from the respective destination communication devices is previously prevented, and as a result, the originating source communication device can receive all the responses from the respective destination communication devices securely without conflict of the responses.
In addition, from a second aspect of the present invention, there is provided a communication method used in a communication system arranged by connecting a plurality of communication devices through a data transmission line, the- method of t
Ito Narihisa
Nakatsugawa Yoshinori
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Tran Thien D
Vu Huy D.
Yazaki -Corporation
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