| 摘要 |
<p>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 (22) which may communicate with a host (20) through a standard interface such as an RS232 interface, and to which a plurality of nodes (24(n)) are coupled in a reconfigurable network. Each node (24(N)) has a plurality of modes controlled by the network controller (22) 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 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.</p> |
