@finopoulos90 Hello, I installed coin acceptor in my arcade cabinet with an Ipac2. Please don't connect 12 volt to the Usb Encoder. without a Zener Diode. Because of the same principle you have to use this schematic link from Ultimarc's website below with a Zener Diode (Coin Mech Setup tab)
https://www.ultimarc.com/cabinet-parts/cabinet-parts/coin-mech.-single-coin/

Kind Regards
Niyazi