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How is works the SIM10M digital input ?
SIM10M digital input is not normal digital inputs where you apply a certain voltage. These digital inputs does only detect a closed circuit (to ground, "sinking currentt")
When an input is connected to ground, a small current is generated (1mA  limited by internal 2.2kOhm resistor)  and measured by the SIM, and a pulse is recorded. The pull-up resistor is 2.47 kohm.
The minimum pulse length is 5 ms, with maximum  frequency 8Hz.
The maximal cable length between meter and SIM digital input  can be  up to 80 meters but it's recommend 40 meters.

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