Since the Ray is connected via optical, commands won’t be sent over CEC. You’ll need to follow the FAQ here. 
 

Étant donné que le Ray est connecté par voie optique, les commandes ne seront pas envoyées via CEC. Vous devrez suivre la FAQ ici.

Thanks Bruce,

Contrary to the information provided in the FAQ, it seems to me that I need to invest in a Sonos HDMI 2-1/optical adapter cable?

“TV remote not recognized by Sonos

This article will help you connect an infrared (IR) TV remote if it was not detected by a Sonos home theater product, either during initial setup or if a remote has already been set up with Sonos. IR remotes are used to control optical cable connected home theater products like the Sonos Ray or Playbar, or another product using the optical audio cable adapter.”

As I like to understand, this means that the optical link alone only transmits the signals in one direction?

Regards.

Francis.

Are we talking about connecting the Sonos Ray to the Samsung, or are we talking about just controlling the volume on the Ray?

Optical is indeed a one way transmission, so the Sonos Ray is unable to report any information back to the TV set. It also is relatively small in bandwidth, so no volume commands are sent across it. It also is limited to Dolby Digital, as any Atmos signal is too much data to pass through the available bandwidth. This often means setting up things on the TV set, and anything passing a signal to the TV set to restrict it to Dolby Digital.

Many TVs already have an optical out port. The Ray normally connects directly to that. If your TV does not have such a port, I believe the Ray ships with an adapter, or you can purchase one that allows you to convert from HDMI ARC (CEC) to optical. 
 

Apple Translate:

Parlons-nous de connecter le Sonos Ray au Samsung, ou parlons-nous simplement de contrôler le volume du Ray ?

L'optique est en effet une transmission à sens unique, de sorte que le Sonos Ray n'est pas en mesure de signaler aucune information au téléviseur. Il est également relativement faible en bande passante, de sorte qu'aucune commande de volume n'est envoyée. Il est également limité à Dolby Digital, car tout signal Atmos est trop de données pour passer par la bande passante disponible. Cela signifie souvent mettre en place des choses sur le téléviseur, et tout ce qui passe un signal au téléviseur pour le restreindre à Dolby Digital.

De nombreux téléviseurs disposent déjà d'un port de sortie optique. Le Ray se connecte normalement directement à cela. Si votre téléviseur ne dispose pas d'un tel port, je crois que le Ray est livré avec un adaptateur, ou vous pouvez en acheter un qui vous permet de convertir de HDMI ARC (CEC) à optique.

Hello Bruce,

My problem is only the sound control. , using the TV remote control.

The Ray is connected to the optical output of the TV.
The Ray works normally in manual mode and with the iPhone.

But I would like to use the TV remote control to control the sound, that would save me from using my iPhone.

All my attempts at adjustment and configuration have been unsuccessful.

Before buying a Sonos HDMI/Toslink adapter, I would like to be sure that it will work.

Thanks for your help.

Francis.

The challenge is that you need to change the remote from a ‘smart’ connection to a IR connection, so the Sonos Ray can ‘see it’. Using the HDMI ARC to optical adapter doesn’t change the fact that volume control isn’t sent across optical. If there isn’t any instructions on how to do that in the TV’s manual, and the link I provided earlier to the FAQ by Sonos doesn’t help, I’d suggest that you call Sonos Support directly to discuss it.

When you speak directly to the phone folks, they have tools at their disposal that will allow them to give you advice specific to your network and Sonos system.