Use a straight through cable. Insure the scanner is in Remote mode indicated by RMT on the display.
Thanks again Bob! Going from my BCT15X, BCD996XT, and BCD996P2 back to the BC780-XLT has been a little confusing for this old guy. Enabling RMT, and changing the baud rate on the 780XLT scanner from 9600 up to 19200 did the trick. I was assuming the scanner was already defaulted at 19200 like all the newer ones.
I was also shocked to see Butel totally abandoned support for his ARC780 product for those of us that bought it back in the day. Let that be a lesson to those of you on the fence regarding who's software to invest in. Not only does ProScan support numerous scanners with one product, and one payment, Bob supports it like no other!
Sending you Bob 200 'Thanks' in advance, as I'm sure it never ends.