hi, I have a VITODENS 300 central heating system. We had to replace the pump VIRS 25/7 Bus and on a short notice we couldn't not find the exact replacement. I think the one mounted is also variable speed. I was wondering if the cable connecting the VITODENs to the pump is a digital data bus (is a 2 wire) or is a simple analog control voltage or current that gives a setpoint speed to the pump? many thanks Christian
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