My plan was to use it connected to the SL input on the speaker (with the MS200 feeding into it), so:

MS200 and LP (via a RIAA preamp) into Distributor 1 and into SL input of the 5200.

TV, Sky, Bluray into 568.2 and into SPDIF/Comms input of the 5200.

I reckon then I don't need RS232 - assuming it will switch on the comms in the SpeakerLink.

Main: Roon-Mac, Oracle Delphi/SME 309/Cadenza Blue, GSP Reflex C, 218, DSP5200SEU, Sky Q, Samsung 49KS7000
Office: Roon-Mac, Quad Vena 2, DALI Opticon 1
Prototype and learning: 101, M30 mk1
Next project: Vintage LS3/5A, QUAD 303