EricFisse

I usually get all my RS232 to RS485 converters at: http://www.usconverters.com/index.php?main_page=index&cPath=65 if I understand you correct then what you are asking for is called a serial PCI card, it has 2 RS232 or RS485 ports and can be built in to any standard PC. The link to the card is: http://www.usconverters.com/index.php?main_page=product_info&cPath=69&products_id=214