Nic take som zatial nevidel (mozno su nejake komponenty na lepenie do delphi), ja by som pouzil VisualC++ s MFC, nie je to sice to co chces (musel by si trochu viac programovat hlavne tu vizualizaciu), ale zato mas prakticky neobmedzene moznosti.

Komunikacia so seriovym portom je pod Win buffrovana a relativne jednoducha, CreateFile("COM1:" ...), SetCommState, ReadFile, WriteFile, ...
priklad otvorenia com portu
http://msdn.microsoft.com/library/default.asp?url=/ library/en-us/devio/base/configuring_a_communicatio ns_resource.asp
komplet pokec
http://msdn.microsoft.com/library/default.asp?url=/ library/en-us/devio/base/communications_resources.a sp