>>Its the type that plugs into the back of a receipt printer. Looks like a phone or network cable.
>>
>
>It's overwhelmingly likely that it's a serial cable of some sort; a parallel cable would have to have at least 10 individual leads (8 data, ground, status/timing) and that's not likely to fit in an RJ11 or RJ45 connector.

From my limited experience (1), it is not even a serial connection. It just powers a solenoid that pops the latch, the drawer is pushed opened by a spring.