[Elecraft] Use of DB9 Switch with K3?

[Georgek5kg at aol.com]

At times, my microHam CW Keyer is connected to my K3 via the P3.   However, 
when I want to download new firmware for the K3, I have to disconnect  the 
CW Keyer from the RS232 port, and connect the DB9 from the computer's serial 
 port to the K3 via the P3.
 
Can I use a DB9 A/B switch to switch between the the two DB9 cables without 
 creating any problems?
 
73, George
 
George  Wagner, K5KG
Sarasota, FL 
941-400-1960  cell