The Epson TM-U220B (model M188B) is a receipt printer with a DB25-DB9 cable. It will be connected to the host via Serial port and recognized in Linux as /dev/ttyS[X]

In this post is explained how to find out which device was detected by the operative system. In my case:

To test the print capabilities the easier way is to send an echo message to that device:

And it was correctly printed.The host used in this test was ThinkCentre M715q with serial port and Lubuntu 12.04.