Hi again. You need to meet following requirements:
1. You need to have an extra power supply to UBS. It has to be 9-30V DC with low ripple noise. Bad quality power supply will cause UBS working incorrectly. This power supply you have to the bell is just a transformer and working with AC current. You cannot power UBS up with this.
2. You need to have a relay. Because outputs on UBS can handle op to 150mA of current, and yours doorbell eating more. It's doesn't really matter which relay you use, but have to meet this conditions: Coil voltage need to match voltage on your power supply to UBS, and coil current need to be below 150mA. (with an electronic door bell, no need for relay in mostly setups)
3. Wirring up. You need to just follow first diagram from the link.
Just imagine that you placing a relay contacts instead of your push button. Yours relay has at least 4 (or 5) pins. 2 pins are coil (pin 86 and 85 on diagram), 3 others are contacts (common (30 on diagram), normally closed (87a) and normally open (87)). You need to figure out what is what, it depends on relay you use.
- Connect relay contacts common and normally open to your doorbell INSTEAD of existing pushbutton, exact same terminals, it will be 0F and 1 on your diagram.
- Coil pins connect to "+" from power supply and one of output terminal OUT2 from UBS.
- Other terminal of OUT2 connect to GND ("-") of power supply.
- Your push button need to be connected to UBS cables IN2 and GND
- Finally, power supply "+" need to be connected to P cable on UBS and "-" to GND cable.
When you will finish with hardware and power UBS up, you will need to change parameter of input type in UBS. Parameter no. 4 has to be changed to 0 (Normal Open)