Advantech - PCI-1612A-BE - PCI Serial Card 4-Port RS-232/422/485 PCI-1612A-BE - Advantech - 4 x Port RS-232/422/485 PCI Serial Communication Card $224.25 $190.04
StarTech - PEX4S232485 - Serial Card 4-Port PCI Express x1 RS-232 RS-422 RS-485 PEX4S232485 - StarTech - 4-Port 2 x RS-232 2 x RS-422 / RS-485 PCI Express x1 Combo Serial Card $385.85 $313.70
IBM - 31P7226 - Serial Card Dual-Port RS-232 PCI Low Profile 31P7226 - IBM - Dual-Ports RS-232 460.8Kbps DB-9 PCI Low Profile Serial Card Adapter $114.24 $92.88
IBM - 37L1429 - Serial Card 128 Port PCI 37L1429 - IBM - 128 Port Serial PCI Card SST128P (2-Connector) $318.88 $259.26
Moxa - PCB104/PCI - Serial Card 4-Port RS-232 PCI Moxa - PCB104/PCI - 4-Port RS-232 Multiport Serial PCI Board $75.33 $61.24