None, RTS/CTS, XON/XOFF

2 Port PCI Board, RS-232

4 Port PCIe Board, w/ DB25M Cable, RS-232/422/485, LowProfile

2 Port UPCI Board, RS-232/422/485, Low Profile, Wide Temperature

2 Port UPCI Board, RS-232/422/485, w/Isolation, Low Profile, Wide Temperature

2 Port UPCI Board, w/DB9M Cable, RS-232/422/485, w/Isolation, Low Profile

4 Port UPCI Board, RS-232, Low Profile, Wide Temperature