hooking up a coin validator

[truffelzwijn]

I'm working on transferring an xbox to an arcade cabinet. The cabinet i bought has a coin validator.

The validator is a S.E.C.I. RM2. There's not much info about this one on the internet so i took my multimeter and did some tests.

Apparantly it is set for 4 types of coins (0.25, 1, 2.5 and 5 guilder pieces). Since i still have some guilders (i forgot to exchange for euros) i would really like to hook it up to my xbox.

The validator has a flat ribbon cable with 6 attached wires (4 empty ones). Two are for power supply 12V the rest are 'data' lines

When i check the resistance i find that some combinations of wires are 'connected' as soon as a valid coin is inserted.

For instance, when i insert a guilders and i check the resistance between line 8 and 9 i can see that they are  'connected' (resistance is pulled low for a fraction of a second). Normally these signal are fed to a PCB that is connected to the Jamma connector (the PCB translates these different coins into different amounts of credits).

The weird thing is that when i check with my multimeter with the + on line 8 and the - on line 9 i get a low resistance but when i exchange the + and - nothing happens. How is this possible?

To use it with my project i need to connect the validator to a button on the joypad (back-button). Could i simply connect the joypad ground to the 9 and the button to the 8? Would this work as a button press?

Is there any risk in trying? I mean, i don't want to ruin my xbox, gamepad or coin validator.

Thank you for your input