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The design in mbus_master_004.qucs-s.sch only "works" when given a constant initial 5V or 0V input. When given a pulse as input mbusminus does not properly go back to VCC as intended. This redesign provides a solution to do so.
This directory contains various simulation of the M-Bus part of MBus_USB.pdf. The simulattions are done with qucs-s using ngspice as simulation backend.
The first simulation is as close to the original as possible and gradulally changed to remove receiving parts and using a zener diode to have a constant 12V voltage drop regardless of the power supply. The final version works with any voltage in M-Bus range.
