Data transmission device, data transmission system, and method
2 Assignments
0 Petitions
Accused Products
Abstract
A data transmission device (1) includes a controller (2), a reception section (5), a transmission section (6), and an MPU (3). The reception section (5) receives an electric signal sent from a preceding device, and outputs its data to the controller (2). The transmission section (6) converts a result of a process by the controller (2) into an electric signal and transmits it to a successive device. The MPU (3) controls operation of the controller (2), the reception section (5), and the transmission section (6) in accordance with the operation mode of the device. The reception section (5) detects cessation of the electric signal sent from the preceding device and, in response to the detection, stops operating. In response to the detection, the transmission section (6) stops operating and stops sending the electric signal to the successive device.
40 Citations
46 Claims
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1-23. -23. (canceled)
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24. A data transmission device connected to a ring-type data transmission network, which electrically communicates with another device via a transmission line in a unidirectional manner, the data transmission device comprising:
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a processing section for processing received data and data to be transmitted based on a predetermined communications protocol;
a reception section for receiving an electric signal sent from a preceding device and outputting data contained in the electric signal to the processing section;
a transmission section for converting a result of a process by the processing section into an electric signal and transmitting the electric signal to a successive device;
a power supply section for supplying power to the processing section, the reception section, and the transmission section; and
a control section for controlling operation of the processing section, the reception section, and the transmission section in accordance with an operation mode of its own device, wherein, the reception section detects cessation of the electric signal sent from the preceding device, if the reception section detects the cessation of the electric signal, the power supply section stops supplying power to the processing section, the reception section, and the transmission section, in response to either one of the cessation of the electric signal sent from the preceding device being detected and power supply from the power supply section being stopped, the reception section stops operating, and in response to either one of the reception section detecting the cessation of the electric signal and the power supply from the power supply section being stopped, the transmission section stops operating and stops sending the electric signal to the successive device. - View Dependent Claims (25, 26, 27, 28, 29, 30)
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31. A data transmission system including a plurality of data transmission devices connected via a transmission line so as to form a ring structure, in which the data transmission devices electrically communicate with one another in a unidirectional manner,
the data transmission devices each comprising: -
a processing section for processing received data and data to be transmitted based on a predetermined communications protocol;
a reception section for receiving an electric signal sent from a preceding data transmission device and outputting data contained in the electric signal to the processing section;
a transmission section for converting a result of a process by the processing section into an electric signal and transmitting the electric signal to a successive data transmission device;
a power supply section for supplying power to the processing section, the reception section, and the transmission section of its own device; and
a control section for controlling operation of the processing section, the reception section, and the transmission section in accordance with an operation mode of its own device, wherein, in at least one of the data transmission devices, the control section stops operation of the processing section, the reception section, and the transmission section of its own device based on a predetermined condition for shift, and the transmission section stops transmission of the electric signal, and in another data transmission device, the reception section of its own device detects cessation of the electric signal sent from the preceding data transmission device, if the reception section detects the cessation of the electric signal, the power supply section of its own device stops supplying power to the processing section, the reception section, and the transmission section, in response to either one of the cessation of the electric signal sent from the preceding data transmission device being detected and power supply from the power supply section of its own device being stopped, the reception section of its own device stops operating, and in response to either one of the reception section of its own device detecting the cessation of the electric signal and the power supply from the power supply section of its own device being stopped, the transmission section of its own device stops operating and stops sending the electric signal to the successive data transmission device. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38)
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39. A data transmission method in which a plurality of nodes are connected via a transmission line so as to form a ring structure and each node electrically communicates with one another in a unidirectional manner, the method comprising:
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a processing step, performed by each node, of processing received data and data to be transmitted based on a predetermined communications protocol;
a reception step, performed by each node, of receiving an electric signal sent from a preceding node and sending data contained in the electric signal to the processing step;
a transmission step, performed by each node, of transmitting a result of a process by the processing step to a successive node as an electric signal;
a power supply step of supplying power used for operation in the processing step, the reception step, and the transmission step; and
a control step, performed by each node, of controlling operation of the processing step, the reception step, and the transmission step in accordance with an operation mode, wherein, in at least one of the nodes, the control step stops operation by the processing step, the reception step, and the transmission step of the node based on a predetermined condition for shift, and the transmission step stops transmission of the electric signal, and in another node, the reception step of its own node detects cessation of the electric signal sent from the preceding node, if the reception step of its own node detects the cessation of the electric signal, the power supply step of its own node stops supplying power used for operation of the processing step, the reception step, and the transmission step of its own node, in response to either one of the cessation of the electric signal sent from the preceding node being detected and the power supply by the power supply step of its own node being stopped, the reception step of its own node stops operation, and in response to either one of the reception step of its own node detecting the cessation of the electric signal and the power supply step of its own node stopping supplying power, the transmission step of its own node stops operation and stops sending the electric signal to the successive node. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46)
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Specification