Power Ground
Converting floating signal to 12V with a common ground
Red - +12V
Black - Ground
X1
Power +12V
13
24
Some machines have isolated internal DC/DC
converters for some circuits. To detect a signal, the
signal must use the same ground as the Sapphire
v3. Measurements and detection will be unreliable -
since there is no common reference point.
The following circuit can be used to convert a
signal from an isolated floating supply to a signal
with a common ground.
Converted signal with common ground, ready to
be used directly as input source for the Sapphire
v3(eg. key switch, usage, …).If needed, pin 87a and
87 can be swapped to convert between active
high and active low signal.
Signal from machine without
common ground
The grey wire in this example is a
floating ground, not shared with
the Sapphire v3. The orange wire is
a positive signal you want to
measure, based on the grey
ground.Make sure to use a suitable
relay for this machine signal (coil
voltage and current).
