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Selecting M-BUS communication type (displaying multiple values from a meter)

The M-BUS is designed for low consumption, and for this reason allows to query device values using different requests. The issue is that some meters respond to a “Basic” request only with the total consumption values; another request type (REQ_UD1, SND_OUD or other) must be used to display more readings, such as the immediate consumption, flow, etc. To this end, HWg-PWR allows to add another meter with the same secondary address. A hidden option is used to activate these advanced request settings.

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Short Perex: 
Activation of an extended M-Bus communication mode using a hidden option.