The dipswitches on the DBV-200 are normally all set to OFF from what I remember. Below is a page from the JCM booklet covering the DBV-200. But different software versions in the DBV-200 eprom can redefine what the dipswitches control, so they say it is best to refer to the SIS document (software information sheet) for the particular software in the eprom to know for sure what the dipswitches do. Unfortunately the label on your eprom just says it is version "2.60", there are several different 2.60 versions, they each have a suffix such as "2.60-04" to identify them. So I don't know which software version is actually in your eprom. If you have an eprom burner you can use it to read the eprom, that will give you its checksum, that is another way to identify it.
Since your DBV-200 is pulling in the bills and transferring them into the cash box without giving credits to the machine it makes me think the DBV might be in test mode. Try setting all of the dipswitches to OFF (if they aren't already). Also, whenever you are troubleshooting a DBV problem it is best to only use $1 bills. That way you don't have to also worry which US bills your DBV eprom software is capable of recognizing. The bills we use now have changed design significantly from back when the DBV software was released, except for the $1 bill.
I think there are some folks here with the Bally Game Maker machine. Maybe one of them can check their DBV-200 and confirm what the dipswitch settings should be. Was this DBV-200 in the machine when you got it, or did you add it later? Can the person you got the machine from help in any way, like tell you if the DBV ever worked or anything about it?
Below is the page from the JCM DBV-200 booklet showing the dipswitch settings. Also attached is one of the SIS documents for ver 2.60-04 software for DBV-200, ID-044/045W comm protocol.