DSC PC 2585 Connection - Phyiscal keyboard is not working after connecting wires

[saikek]

Hello! I'm using pretty old DSC PC 2585 keyboard.
Wiring is completed to my ESP8266 via Buck-down converter for 3.3 volts and Optocouplers for Yellow and Green wires. Pins are connected & configured for D1=Yellow and D2=GREEN (I want read-only).

However when all wires are connected - DSC physical keyboard stops working - the LED's are still on, but it does not react to button clicks. As soon as I disconnect my breadboard - it works OK.

I want to just be able to display alarm status & sensors on my Home assistant. Maybe i'm missing something here ?

[saikek]

There seems to be an issue when using optocoupler.
I was not able to figure out what causes them.

Closing the issue. Updated my Alarm to newer version and was using resistors + duck-down converter.