Will cdx ca900x sony deck be compatible with a rm-x110 remote because the rm-x112 is the original please know what you're talking about?

Answer 1

Sony tend to use a control protocol that is consistent across many models. It is likely that the control data will be compatible. However, some devices in the Sony range can have specific addresses and therefore require certain remote controls.

In some cases, decks can have addresses set using a menu or switches on the deck itself. It is probably worth making the specific enquiry with a Sony specialist or Sony's technical support.