| 摘要 |
In order to monitor the operation of a system or apparatus, a physical parameter of the system or apparatus is repeatedly changed or periodically oscillated within defined limits. Under normal conditions, stable oscillation will occur. In the event of a fault or system failure, oscillations will become unstable and a fault indicator may be generated. A communication system which may use the foregoing monitoring method includes a plurality of function units arranged in groups with individulal units in each group being connected to each other in series. A separate address is allocated to each group of function units and communication with units in each group is achieved sequentially.
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