On these days I developed a serial interface for Fluke 9010a because the one I had purchased it was without.
I wanted to have both USB a classic RS232C.
The nice thing is that they can run both and any setup or switch is needed.
here you can see a video:
http://youtu.be/uunibnFOJJgSince I had to print 10 circuits, if anyone is interested they are on sale at € 20 each