User's Manual
RTM Elster AMCO applicative PFS Coronis Systems
5.10.Communication and reading error detection (encoder only)
Definitions :
Communication error : what CORONIS calls a communication error is when RTM Elster AMCO
observed no data on data wire after a certain period of time, when attempting to read the encoder.
Reading error : what CORONIS calls a reading error is when an error is detected in one of the
fields of the data frame returned by the encoder ( ? or : in the “value” field for example).
5.10.1.Encoder communication error
The encoder communication error can be detected either following a radio request or when a periodic action
is processed (datalogging for example).Once the communication error has been detected, it is pointed out
through bit 1 and bit 2 in “Application Status" parameter and the detection date (RTC) is recorded.
5.10.2.Encoder reading error detection
On another hand, there could be a misread due to the encoder itself (interdigit, ...).
Filtering algorithm deactivated
RTM Elster AMCO handles these misreads in order to give more precision on the fault detected. Since these
reading errors could happen in a daily basis, RTM Elster AMCO will not handle each reading error separately
but on a 24 hours period. Assuming that the encoder is read every hour, if during 24 consecutive readings,
RTM Elster AMCO is unable to read an error-free frame from the encoder, a reading error is detected and
pointed out through bit 3 and bit 4 in “Application Status" parameter and the reading error detection date
(RTC) is recorded.
Filtering algorithm activated
If filtering algorithm is activated, then the RTM Elster AMCO reads three times the encoder every “Reading
Sampling period” (internal parameter 0x07). The algorithm used is the one provided by Elster AMCO. This
one is a majority function computed on the three readings performed. Even if the filtering algorithm is
activated, RTM Elster AMCO will not handle each reading error separately but on a 24 hours period.
ATTENTION :
1) Each time a reading attempt is unsuccessful, RTM Elster AMCO logs the previous valid
reading if datalogging is set.
2) It is important to notice that the filtering algorithm is power consuming and will lead to a
decrease of the RTM Elster AMCO life duration of 3 to 4 years when it is activated.
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