Ignore the above. I finally figured out what I was doing wrong.
Other than the version number that
sheet could use just the addition of one instruction: Somewhere near the top you need to point out the HP-1 should be in normal operating (scanning) mode before you start and the "Serial" selection made when the cable is plugged in.
The part that threw me was having it in a normal operating mode
before I started it in Unitrunker.