| 摘要 |
A distributed two-wire monitoring system in which multiple processors (100, 102, 104, 106, 108) and data gathering devices (116) are arranged in a tree structure. A local version of a database is stored within each processor. The local database within any particular processor (e.g. 102) contains addresses of all data gathering devices (116), and associated with each address is the latest-known value of corresponding data, display messages, and scaling factors, together with an information item which indicates the position in the tree structure of the data gathering device (116) relative to the particular processor (102). By storing such information locally, traffic throughout the system is reduced. Only data changes need to be communicated. |
