1-Should I connect both the 861 and the 800 to the Crestron system or can I connect only one of them and then have the commands send through Meridian Comms to the second unit?
i can't speak to the 800, but i have an 861 and 598DP setup and only my 861 is connected to the crestron - works fine with passthrough to the 598DP. no clue if the 800 takes more commands than will be passed through. there's not particular reason (in theory) that you couldn't connect the 800 as well - you just might never use it for control - or only very very rarely for special functions the 861 doesn't pass through.
2-How useful is the frontal RS-232 connector when you realise that the connector on the back should be permanently connected to the Crestron system? Does this mean that I have to slide out the rack whenever there is an upgrade I want to install and then unplug the RS-232 connector on the back (that is connected to the Crestron system) to replace it with the RS-232 cable that goes to the pc?
i find this annoying on my setup. i do not have a rack-mount 861, so no frontal RS232. i have made it so that there's enough room UNDER my 861 so i can get my (long) arm in there and swap the cable without pulling my rack. but it's annoying.
fwiw,
doody.