Add four serial ports to your system with this Mini-PCIe module. If no free Mini-PCIe slots are available you can also connect this module directly to the USB host pin header of your motherboard to add four serial ports to your build.
2 x RS-232, 2 x RS-422 or 2 x RS-485
+3.3V from Mini -PCIe, +5V from external cable
0°C ~ 60 °C (32 °F ~ 140 °F)
-40°C ~ 85°C (-40°F ~ 185°F)