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BBSP is mixed kind of scanner especially designed for pedal controls in organ consoles. You can connect keys and potentiometers with just one board,
and only one cable connected to master controller. Keys must have one pole of each contact connected to ground. Keyboard is connected using twor 16-pin IDCs.
One connector covers 16 keys.
As any other scanner board, this one cannot work just by itself, but it needs one of the master controllers to operate.
Here is connection diagram for contacts:
And here for the potentiometers on the red connector:
Pin 1 is at the side with a hole in PCB, for polarizing key of the plug. It's also the red wire of PotsTail.
You may be interested also in the following products (click the image for more info):
PotsTail 5-wire cable with plug for analog inputs of BBSP
WIPLUG breakout board distributing 2 ribbon cables to 32 screw terminals
WIPLUG2 small utility board for soldering individual wires to 16-pin header