Hi everyone,

I'm struggling to set up my Ring Intercom with a TCS ISH3130 uniphone (2-wire BUS system). 

My current setup:

• Terminal 1 (Port a): Originally has two wires connected (Blue and Red).

• Terminal 2 (Port b): Originally has one wire connected (Brown).

The Problem: Following the app instructions, I connected wire C-10 to Terminal 1 and wire C-9 to Terminal 2

and unfortunatelly i can't complet the first setup.

As soon as I plug in the Ring Intercom, the LEDs on my TCS unit start flashing, which usually indicates a BUS error or fault in this system. When I disconnect the Ring Intercom wires, the flashing stops and the intercom works fine again.

During the final test step in ring app , on the Intercom the green led flashing (Device is in test mode) I going downsters and press the button, but I receive always the error that device can't receive event signal.

Steps I have already taken:

1. Polarity Swap: I tried swapping the Ring wires (C-9 to Terminal 1 and C-10 to Terminal 2),

2. Connection Check: I ensured that the wires are seated correctly, though there are 3 wires now in Terminal 1, making it quite tight.

I've attached photos of my wiring and the error state. Any help would be greatly appreciated!