There are several sub $100 commercial RS232/422 to Ethernet units in=20
enclosure available
PCB based solutions without enclosures are <$60

Most of these solutions install a virtual COM port on the PC side, so softw=
are
can talk to the remote serial device as if it were physically=20
connected to the PC via a RS232 cable.

For example $84.60 (with enclosure):
http://microcontrollershop.com/product_info.php?products_id=3D2070

Same unit without enclosure $60:
http://microcontrollershop.com/product_info.php?cPath=3D98_284&products_id=
=3D1978

Many more at:
http://microcontrollershop.com/default.php?cPath=3D98_284

best regards
Volker

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