Amr,
1747-l543 processor, is a 504 so that means you do have DH+
I never heard of 1747-bsn...Thanks, it's cool, I still don't think that I will ever have the need for one.
So if you need to get on the data highway, you will need the standard stuff, RSlogix500, RSlinx and then a card for your computer...
If you are using a lap top the 1748-PCMK/B will work well, the cable that I use is 1748-PCM6/B, with this I have several options to hook up.
If you are using a standard pc, then depending on what slots you have avalibale, I have some 1784KTXD's I use these in my ISA slots, these are very dependable
I'm hoping that Ken Roach or someone will step in and help, I'm not sure if the BSN has a special comm...
hope this helps