System for data communication on automobile
First Claim
1. A data communication system for use on a motor vehicle, comprising:
- a communication bus;
at least one master unit connected to said communication bus; and
at least one slave unit connected to said communication bus;
said master unit having connection request demand means for outputting connection request demand data to demand a request for a connection to the communication bus to said slave unit when the master unit is enabled;
said slave unit having connection request means for transmitting its own connection request information to said master unit in response to said connection request demand data from the master unit if said connection request demand data is received by said slave unit, and for continually transmitting the connection request information to said master unit in each predetermined time period as long as said data communication system is energized if said connection request demand data is not received by said slave unit.
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Accused Products
Abstract
A data communication system for use on a motor vehicle includes at least one master unit and at least one slave unit which are connected to a communication bus. When the master unit is enabled, the master controller of the master unit outputs connection request demand data to the slave unit. The slave unit has a slave controller which transmits its own connection request information to the master unit in response to the connection request demand data from the master unit. The slave controller transmits, to the master unit, first change information indicating whether the connection information stored in a first memory and connection information of the slave unit that has been transmitted to the master unit are identical to each other or not. The master controller transmits some or all of connection information stored in a second memory to slave units based on the first change information of the slave units. When the data communication system is enabled, the slave controller of each slave unit transmits its own connection request information to the master unit. In response to the connection request information, the master controller establishes a communication address of each slave unit different from those of the other slave units and transmits the established communication address to the slave unit.
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Citations
25 Claims
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1. A data communication system for use on a motor vehicle, comprising:
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a communication bus; at least one master unit connected to said communication bus; and at least one slave unit connected to said communication bus; said master unit having connection request demand means for outputting connection request demand data to demand a request for a connection to the communication bus to said slave unit when the master unit is enabled; said slave unit having connection request means for transmitting its own connection request information to said master unit in response to said connection request demand data from the master unit if said connection request demand data is received by said slave unit, and for continually transmitting the connection request information to said master unit in each predetermined time period as long as said data communication system is energized if said connection request demand data is not received by said slave unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A data communication system for use on a motor vehicle, comprising:
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a communication bus; at least one master unit connected to said communication bus; and a plurality of slave units connected to said communication bus; each of said slave units transmitting connection information thereof to said master unit, and comprising; first memory means for storing present connection information thereof; and first connection information transmitting means for transmitting, to said master unit, first change information indicating whether said present connection information stored in said first memory means and previous connection information of the slave unit that has been transmitted to said master unit prior to said present connection information are identical to each other or not; said master unit comprising; second memory means for storing connection information thereof; and second connection information transmitting means for transmitting the connection information stored in said second memory means to said slave units based on the first change information of each of said slave units. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. A data communication system for use on a motor vehicle, comprising:
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a communication bus; at least one master unit connected to said communication bus; and a plurality of slave units connected to said communication bus; each of said slave units comprising; memory means for storing a communication address thereof updatably; and connection request means for transmitting connection request information thereof to said master unit when the data communication system starts to operate; said master unit comprising communication address setting means for establishing a communication address of each of the slave units different from those of the other slave units and transmitting the established communication address to the slave unit when the connection request information is received. - View Dependent Claims (23, 24, 25)
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Specification