Most of the "EIA485 to TCP/IP converters" that I have worked with, have to be configured to wrap the UDP Packets into IP packets (similar to the BACnet BBMD Function).
Not shure if this is anything helpful, but some EIA485 data packets need the extra coaxing to
get thru IP switches.
UDP are broadcasts and not forwarded thru IP switches, IP packets do make it thru IP switches.
Maybe something to look at.
Just some 2 bits of thoughts.
"We are what we repeatedly do. Excellence, then, is not an act, but a habit" Aristotle
Remember to "Pay it Forward"; help out the newer generation of techs, remember someone during our career helped us! ("Pay it Forward" was by someone smarter than me!!)