In an attempt to solve this problem, I was cross-checking my connections several times. During this, I thought it will be interesting to see the DALI signal coming out of WAGO DALI Module as opposed to the signal coming out of my board. I was surprised to see that, the DALI signal voltage range from WAGO DALI module is very low compared to what is given in the standard. I was expecting a signal range like (18V HIGH - 0V LOW [with appropriate tolerance]) but I got something around 1.7V.
Now, I am wondering if my power supply connection and understanding is correct at all! and I want to understand the basic DALI signal flow between DALI PHY and DALI Slave. Here with the WAGO Module, I am using 18Vdc, 1.1A 787-1007 module as the power supply.
Q1.I could not exactly understand how and why is this voltage level stepping down from 18V to the range of ~1.5V.
Q2. How is the current limiting to 250mA carried out in the above circuit?