Login to www.epsonexperts.com and download the most updated OPOS drivers for Epson
Application Development -> OLEPOS -> OPOS ADK (currently on version 2.70E R17)
When installing OPOSADK make sure to select the interface that belong to your printer (USB, Ethernet, Serial, LPT, Bluetooth)
When creating the Printer OPOS device, you have to create the interface port, and setup the communication settings propertly.
I have install a good number of TM-T20 serial and usb printers, since this have a much better price than TM-T88s, and haven't had any problem, with either interface.
Any problems or question just send me an email
Alejandro Giraldo
RetailAid Business Solutions
9-20 35th Ave, Suite 3-O
Long Island City, NY 11106
ph: (718) 786 6870
fax: (718) 701 5889
www.RetailAid.com
agiraldo@retailaid.com