I have a data collector device which has a RS-232 male port, and the PC which sends data to that device has also a COM (RS-232) male port.

For wiring I have a RS-232 cable (male to female) and a [gender changer](http://en.wikipedia.org/wiki/Gender_changer). 

```
PC---gender changer------RS-232 cable---------data collector device

```

But it seems not work; the device is not receiving data.
I assume that I may need a null modem cable. How can I solve this problem even without having a null modem cable? is there a software can change the wiring/pin assignment from PC side?