Add two rs232 serial ports and one parallel port to an embedded system through a mini pci express slot the mpex2s1p552 2s1p mini pci express serialparallel combo card turns a mini pcie slot into two rs232 db9 serial ports and one ieee 1284 parallel port a cost saving solution for adding serial and parallel support to embedded systems that lack built in serialparallel functionality the 16650 uart adapter card features a native pci express single chip design which enables you to