The PDF in the Attachments section of this FAQ contains instructions on changing a swappable interface card on a Star Micronics Printer.
As a leading POS printer manufacturer, Star Micronics provides support for Serial, Parallel, USB, Powered USB, and Ethernet printing*. We understand that systems, configuration, and POS software can change, which can result in a desired or necessary upgrade to POS hardware. Star Micronics printers have been affectionately coined by our customers as "Workhorses" because of their long operation lives and high reliability... Purchasing a new printer just to upgrade the interface is a costly and unnecessary expense to store and restaurant owners, which is why Star Micronics supports swappable interface connections for many of its models. This feature is especially convenient for users upgrading from old systems requiring serial interfaces to new systems that support USB or Ethernet connections.