Only the big connector gets used. You need to have the proper firmware installed on your printer. A Gen2 RS-232 is a printer widely used in bally, Aristocrat, Konami, and WMS slots, but each requires compatible firmware. To see which firmware is on your printer, hold down the feed button on the printer as you power up the machine, the printer will print a test ticket with the firmware information. Post a photo or just whatever firmware is shown on the printed ticket and we can verify if your firmware is correct for your device. If it is not, you would need flash the printer with the correct firmware (a special serial cable needs to be made up), have someone flash it for you, or just buy one with the correct firmware (the printers are inexpensive enough where the shipping back and forth might be higher depending on where you live).