Bill what is the OPOS ID for the cash drawer?
My printer is a Epson TM-88III and the Cash Drawer is MMF 225 series.
The LDN is CashDrawer1.
Thanks
John
Since the cash drawer is plugged into the printer, the first thing I'd try is setting the RetailEdge OPOS ID value to OPOS.POSPrinter. The printer is driving the cash drawer so this might work.