[Elecraft] K2 - (K2-100) aux I/O

[Gene O]

I have a K2 with the 100W, K2/100, mounted in the top.  I want to obtain 
a RS232 cable with male DB9 on one end and female on the other.

In order to make the connection in the back or the K2 it seems the male 
plug needs to be modified.  That is a slot cut so that it fits the 
key/tab that is on the connector mounted in the back of the K2/100.

Is there any problem with this as long as the cable just has the typical 
3 wires for RS232 data?

Thanks.

Gene - W2BXR