Logitech B100 Optical Mouse For Business Black

add Two Rs232, And Two Rs422/485 Serial Ports To Your Pc Through A Pci-express Expansion Slot. The Pex4s232485 4 Port Pci Express Pcie Serial Combo Card - 2 X Rs232 2 X Rs422 / Rs485 Lets You Add Two Rs232, And Two Rs422/485 Serial Ports To Your Pc Through A Pci-express Expansion Slot.this Pci Express Serial Card Is A Single Card Solution That Is Compatible With Nearly Any Serial Communication Protocol, Supporting Rs-232, Rs-422, Rs-485 2-wire Or Rs-485 4-wire Operating Modes.a Flexible Solution For Adding Serial Ports To Full-sized, Or Small Form Factor Systems, The 4-port Serial Card Includes Both Low And Full Profile Brackets While The Included Breakout Cable Helps To Avoid Cluttered Connections.backed By A Startech.com Lifetime Warranty And Free Lifetime Technical Support.