Digital BW, The Print

Loris,

I've gotten a couple of rolls of Ilford XP2 which
 I plan to use this coming Friday.  When you've scanned this type of 
negative, do you use the grayscale setting or RGB, and do you scan as a 
negative or a positive?  (I've been scanning all of my prior B&W negatives as 
grayscale positives.)

Thanks!

Bob