More than likely the Baud is very slow 300, 600, or 1200. A Fanuc 6T on an old Ikegai FX25N was 1200. I'm assuming your Fanuc 3M is a bit Slower. Do you know the Year of the Machine and Control? If it's newer (1990 and up) it may be quite Fast around 9600 and above.
The BCC V19 Settings for Send and Recieve for Ikegai Fanuc 6T (1984)
Data Bits >7
Stop Bits >1
If you have a manual checkout the RS232C Settings. It should also show you what pins to use on the connectors. One more important thing is that a lot of computers today don't have a Male RS232C connector, hence you my have to use other means of program transfers. There are 3 1/2 floppy drives or USB interfaces for Mini Cruzers. Of coarse $$$$$$$$$$$ has to be spent.
You can also post in the BCC Forum http://18.104.22.168/bobcadsupport/forums/
Post it under RS232 on the Main Page.
As for the Pin Diagram I used to have one but can't find it, sorry. I'll keep looking and post it here.