The PPI also requires a power supply to operate the leds. The supply can be AC or DC, and
must be in the range of 9V to 16V for correct operation. If using a DC supply, take care to
connect the positive and negative leads correctly. No harm will be done to the PPI if they are
connected in reverse, but the PPI will not function. If your points operate from a supply
above 16V, the PPI can be powered from a separate supply (12V DC recommended).
When powering up, the uP (red) led on the pcb will light when the microprocessor is running.
Each time a point is operated, the IP (yellow) led flashes to confirm the input signal. If the
points position has changed, the (red) uP led on the flashes to indicate that the updated status
has been stored in memory.
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