How can I integrate roller shutter control with the Delta Controls BMS system?

Hello!
I’d like to seek advice from someone with more experience in automation systems.
I’ve installed a system at home to control the roller blinds on my windows:
by each window, I have a button with a mechanical up/down memory; a UTP5k twisted-pair cable runs from this to the distribution board and connects to a relay coil (12VDC). I have as many relays as there are windows (17) × 2 (up and down). When the relay closes, the window either opens or closes. Now, however, I’ve decided to connect the roller shutters to the BMS system I have at home (Deltacontrols), and I’m having trouble doing this without having to buy an extra 34 inputs/outputs (10,000 PLN!) so that I can control selected groups of roller shutters – for example, all of them, the ground floor, the first floor, north and south sides, etc.
The point is that I’d have to separate the inputs and outputs somehow so that I could control selected outputs. When I connect the system to control all of them and bridge the relays, switching on one subsequently causes all of them to switch on I hope I’ve described the situation clearly.
The controller allows a voltage of 0–10 VDC to be applied to both the input and output. Thank you in advance for your help.

Use one of the BMS outputs and feed an active signal from it to the relays via rectifier diodes, so that when controlling a single roller blind, the voltage from the coil cannot flow back to the ‘bridge’.

Thank you for your help.

Could you please explain this in a bit more detail – as I’m not that familiar with the electronics themselves.

I still can’t quite picture this separation – where exactly should it be?

If I’ve understood correctly, I need to insert as many diodes as the number of functions I want for a given blind, plus the number of blinds I have (x2), in series with the BMS output?

Connect the cathode of a rectifier diode to each relay coil. Connect the anodes of all the diodes together and apply the + voltage from one of the controller’s channels to them.

When you activate the controller, a positive voltage will appear at its output, which will flow through the diodes to the relay coils, activating them all. However, if you manually activate a single selected relay, as before, the supply voltage to that relay will not flow back through the diode to the adjacent ones.

A rectifier diode is nothing more than a ‘one-way valve’ (to visualise how it works )

Where the diode’s cathode is on the side with the stripe marked on it.

The diode could be, for example, a 1N4002 or something similar (it doesn’t really matter)