Simga2N Traction Advanced Manual– V1.3 Page 22 (166) ©2021 DMC GmbH Herten Germany
3.1.2 Wiring of digital inputs
The DMC Sigma2 controllers have the ability to set all digital inputs at runtime as active low or as active high. This setting
is made in the controller setup menu.
Active Low digital inputs
For using Active Low digital input The DMC Sigma2 controller must be setup for active low digital inputs by setting the
parameter “M2-8 Digital inputs active low/high ”ActvL/H”” to 0.
Using a mechanical switch
An active low digital input can be activated using a simple mechanical switch. The switch is wired between the B- or
GND terminal and one of the digital inputs. To signal that the switch is activated, a lamp can be connected between the
digital input and the B+ or Vbatt terminal.
(lamp is optional)
Using an electronic switch
An active low digital input can be activated using an electronic switch. The electronic switch is powered with a supply
voltage greater than 3V3. The digital output of this electronic switch is high when not activated, which results in an
output voltage greater than 1,5V. When the electronic switch is activated the digital output becomes low, which results
in an output voltage equal or lower than 0.3V.
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