The function of this board is very basic.
It contains of two large 7-segment displays, an incrimental switch and a tumble switch or jumper.
The incrimental switch is something you are familiar with because most train controllers use the same device for speed-control.
Two I2C chips receive the position from the mainboard GCA145.
The switch or jumper is to select the programming mode, where each position of the bridge can be fine-tuned.
IMPORTANT NOTE !!!!!!
Some users seem to know better, and solder wires directly to the pins or the pc-board.!
That is totally unacceptable !!
Wires will easily break off, and cause a lot of damage in many cases.
So use connectors !!!!!
This cable is a straight connection, 8 wires, so pin1 to pin1, pin2 to pin2, etc.
Two connectors PSK 254/8W are used with 16 PSK Pins.
The pins can be soldered but using a special plier (Reichelt : PSK Krimpzange) is preferrable.
If you need just one cable, ask Peter Giling