DeviceMaster UP
Our company makes a product called the DeviceMaster UP. This product can do serial to ethernet (and vice versa), as well as serial to Ethernet/IP. We have configured several installations involving sending ASCII serial strings across an Ethernet medium via Ethernet/IP between a PLC and a printer. Sample logic is included and can be downloaded from our website also. Feel free to google our part number 99011-6 for links leading to the specifications for the product. I am unable to post a link here for some reason.
Or feel free to contact me direct, and I can assist you further with your needs.