Again, my many thanks to Scott, Dave, Bill, and Dan.
The only changes I made are:
Parity was change FROM 8N2 to 8N1
Command to read Frequency was already "IF;" and unchanged.
Command to read Mode was blank and changed to "BD;".
ACL 5.7 now responds to band and frequency changes on the TS-2000.
Thanks again, folks. I really appreciate all the tips. I have written the settings in my engineering logbook (a habit I picked up from 34 years at Scientific-Atlanta) so they are in a place where I can find them again if needed.
Best 73 to all,