Thanks Ian. Well I have the Crestron set to require CTS/RTS and its working so either the CTS/RTS are hard wired in the 861 or its doing RTS/CTS.

We shall see. Pacing works sending data to the 861 but I can't control the pace coming from the 861.

Lets see if requiring RTS/CTS has any effect.

861v8+ID40, HD621, 808.3, MC200, 8000, 7200HC, 4x 5200, analog sub, iPads.
The MC200 feeds a Crestron source.