There is no +5v power on the bus. Since only few devices need that, we only implemented +12V, -12V and GND.

We recommend to use a power converter that can be plugged on a free socket on the bus. Preferrably one that converts -12V to +5V since the -12V rail is used less commonly and has more resources left that can be transformed to +5V.

Do not draw the +5V from the internal components of the kb37 as this can damage your device permanently.