WEIGL ProCommander LX Instruction Manual page 25

On pin 9 of the 10-pin connector blocks the internal voltage
of the power supply is brought out. Pin 9 of the top row is
permanently connected. Pin 9 of the bottom row is connected
to the common cathode of the output driver. Pin 9 must be
connected to + of an external power supply, to protect the
driver against overvoltage, if inductive loads are connected to
open collector outputs. The internal voltage of the power supply
can be connected to each of the pin 9, by closing the Jumpers
K08 and K10 (see marking on the picture below). K08 connects
the Pin 9 of the first block (open-collector 1-8) and K10 connects
Pin 9 of the second block (open-collector 9-16).
Thus the built-in free-wheeling diodes may also be used even
an additional power supply for external devices is used. In such
a case, the jumpers have to keep open (see marks in the picture
below). Sufficient the internal power supply also for the external
devices, the jumpers have to be closed, in order to take out
power of these pins.
ProCommander LX pin assignments
25