Shuttle COM port adapter cable for P20U, P22U, P51U, P52U, X50V9, XH410G, XH510G(2), XH610G(2), SH610R4,DS10U, DS20U, DS50UShuttle COM port adapter cable P N 45R DS8311 0101 P20U, P22U, P51U, P52U: These Shuttle XPC all in one products come with two COM ports as standard. The PCP11 adds up to two more COM ports which makes it a total of four serial COM ports (RS232) with Sub D connectors. X50V9: with the help of PCP11, the Shuttle XPC all in one PC X50V9 can be equipped with up to two COM ports. DS10U, DS20U, DS50U: These Shuttle XPC slim Series comes with one COM Port