Showing papers on "Sensor node published in 1986"

Reconfigurable local area network

Abstract: Local area networks having a high level of network integrity, error detection and correction, message security, expandability and flexibility are disclosed. The system is comprised of a loop controller which may communicate with a host through a standard interface such as an RS232 interface, and to which a plurality of nodes are coupled in a reconfigurable network. Each node has a plurality of modes controlled by the network controller to serve various functions depending upon requests from the controller and/or the needs or condition of the respective node from time to time. In particular, the first node is coupled to the controller through a pair of wires, with each successive node being coupled to the preceding node through a similar pair of wires. In one mode, the respective node monitors the incoming signal from the controller as repeated through any preceding nodes, and itself acts as a signal repeater for the next downstream node. The node also acts as a signal repeater to any return signal from the downstream node to pass that signal on toward the loop controller. In another mode the respective node provides its own signal on the return line for transmission toward the controller, and at the same time monitors the incoming return signal received from the next downstream node for repeating that signal on the upstream return line as soon as it completes its own transmission. In still another mode, the incoming signal is not repeated for the next node downstream but rather is looped back toward the controller.