Help with 9pin Serial Adapter

[Viricide]

I have this adapter 9pin serial male to female adapter and I'm not sure what it is for. Anyone have any ideas, here are the pinouts.

M                        FM
--------------------------
1                        5
2                        x
3                        2
4                        3
                         1-7,8
                         4-6

[Anonymous]

I have this adapter 9pin serial male to female adapter and I'm not sure what it is for. Anyone have any ideas, here are the pinouts.

M                        FM
--------------------------
1                        5
2                        x
3                        2
4                        3
                         1-7,8
                         4-6

It's a adapter to make your own "null-modem" / "0-modem", crosslinked serialcabel of two RS-232 standard straight cables. Crosslinked cable are used in some equipment-connections and for example in "direct-cable connection" with two PC:s connected to each other running Widows.