Importance

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Abstract

A reader device, preferably implemented in solid-state form, is provided as a separate element for connecting to a so-called cumulative operations measurement system. Such a system is, for example, concerned with the measurement of elapsed time, especially in determining how long a particular piece of apparatus may have been functioning; or, on the other hand, measuring events such as the number of times a particular piece of apparatus has been turned on without regard to the elapsed time. The reader device is preferably provided with its own source of power, or it can rely on the power source contained within the operations measurement system. The reader device is designed on a conservative basis such that it carefully monitors the frequency involved in the measurement system, and determines whether the measurement system is operating at the correct frequency; furthermore, whether there are low-voltage battery conditions present in the system; a special filter arrangement is provided such that a very low data rate can be employed.

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First Claim