Wiring help needed!

[durak]

Bought an electronic coin mech today, the seller did give me some instructions on how to connect it but he wasn't sure himself and I kind of forgot what he said anyways.  

Question is, how do I wire it to the I-pac? O/P1 to coin1 on i-pac? Do I need to wire a ground too, and if so will I just wire the same ground that comes from the power supply to the credit board also to the i-pac ground?

I know no one probably is familiar with the credit board I have, but just based on your general knowledge about electronics could you give me advice?

thanks!

[Thenasty]

before you connect it to the ipac, make sure the coin1 coin2 are not giving 12vdc.
And if not, you can hook up the ipac coin1 coin2 and also you need the common ground, you need to hook it up to your mech but where ? I'm guessing it would be in that 0volt on your diagram.