Hi everybody

This morning this will be my last test : the 60145 terminal 2

I will connect booster 2 and 3 to terminal 1 which works with booster 1.

if booster 2 and 3 work, it's a problem of 60145 terminal 2

Have a nice day

Serge

Glad you figured out your problem. Unfortunately, it did take a long time and caused some stress.

Harold.

Yes, the distance will be a problem and has an effect on the operational reliability. Hence Märklin recommends a maximum of 100 m lenght by a minimum of 30 devices at the CAN bus main lines (there is a CAN bus high and CAN bus low. At the end both lines are connected and terminated by a 120 Ohm resistor). The length of the stub to a device shall have a maximum lenght of 2 meters. Dr. Stefan Krauß depicts it on his website and articles about the CAN bus as well. To achieve an operational reliability he recommends to follow Märklin's guidelines, even it may be possible these guidlines may be exceeded by facts sometimes.

Because of these guidelines Märklin offers all its various cables for CAN bus devcies with a maximum lenght of 2 meters. How did you achieve the lenghts of 3,6 m or 2,5 m?

Just a clarifying comment on a very early post in this thread on voltage measurements taken with a MAS830B (a digital multimeter to measure voltages).
These devices by themselves don't give you an accurate reading of the voltage levels on the track because of the square wave digital signal data.
If taking a DC measurement, you will likely get an average voltage (and as the digital signal has the voltage moving up and down to encode the digital data on top of the total amplitude actual voltage level, your will get a much lower voltage reading than it really is).
The AC measurement setting is generally configured to give you AC voltages in the 50-60Hz range of frequencies and of sinusoidal waveform. Again the digital square wave signal nature will not give you a proper voltage reading. You either need to put a circuit between the track and your multi-meter terminals to filter out the digital data so you read the DC level, or use an oscilloscope to see the waveform and view the voltage.

Not only changing buying an oscilloscope. But as you wrote, you are not Croesus .......