That print server probably supports LPR printing (most do) so I would suggest setting up the printers as network lpr printers. Should be fairly straight forward. Open your CUPS web interface click on Add printer, and just step through the add Printer wizard..
CUPS web Interface http://localhost:631
The URI you enter into CUPS will look something like this
IP_ADDRESS: Address of the Print Server
QUEUE_NAME: Name assigned to the port in the print server
See the Setup directions for your Print server for more information..(don't know if this is the one you have, you did not provide a model number..)