Let me know how it goes. My damn 8870 is touchy as all hell; it takes running the wires just right, with lots of solid good contact and no forgiveness on any missing strands off the 8811, in order to achieve PC communication (either HyperTerminal or CQC). Matter of fact, it's been down for several months since I put in my distro panel, as I obviously didn't do some stupid tiny little thing right with the wiring and it refuses to talk to a PC.
Ooops, meant to give you the all-in-one manual (8870 & 8811).
Here's that version. I don't have just an 8811, this covers both installs.