Installing an Epson UB-E04 Print server on a TM V is relatively easy. It is about a 15 minute process but you have to change the DSW2 Switch on port 8 from off to on. The reason for the upgrade had to do with setting up a remote office that had to have a non-dedicated POS system. Typically you would have a dedicated POS system whether it is an iPad, PC or other sort of system. You can read my follow up post on the reasons and rationale for this system setup. The TMV that I was working with had a built in RS-232 card and I replaced it with a UB-E04 print server I kept from a dead restick TMIV. This post applies for the Epson TM-III, TM-IV, and TM-V
Step 1 - Remove the RS-232 port and install the UB-E04 Print Server
Step 2 - Open up and Flip the Dip Switch in DSW2 from off to on.
Below are two excellent and more detailed posts for installing Epson print servers, if you require more detailed information.
https://www.beaglehardware.com/howtoethernet.html
https://smstiming.zendesk.com/hc/en-us/articles/115001038548-How-to-install-and-configure-Epson-Printer-for-Ethernet-communication
