Power Ground
Converting ground signal to +12V
Red - +12V
Black - Ground
X1
Power +12V
13
24
Some machines use a pull-to-ground for
internal signals such as the key switch or
hour counter. The Sapphire v3 needs a
logic high voltage on the inputs to be
detected.
The following circuit can be used to
convert a pull-to-ground signal to an
active high signal.
Converted active high signal, ready to be used
directly as input source for the Sapphire v3(eg. key
switch, usage, …). Outputs 12V when active and
pulls to ground when inactive.
Active low signal from
machine
(pull-to-ground) that
needs to be converted
to active high. (eg.key
switch, usage, …)
