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Chapter 3Settings
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3.4.2 Connecting the Product to an Open-
Collector (Open-Drain) Output Device
Some flowmeters and wattmeters feature open-drain or
open-collector pulse output. In such a case, connect the
product as shown in the diagram. Insert a resistor between
the external power supply and open-collector output. Make
sure the resistor can turn on (allow a current to flow
through) the transistor used in the open collector. For an
open-drain pulse output, follow the same procedure.