I am new and just got an M84 which I would like to wire to a 24997 uncoupler. The wiring description with the manual is confusing. Can anyone provide a simpler wiring diagram?

Thanks for the reply. I think the M84 is the latest version but does the same. I connected as per your instruction and the M84 is working with something happening at the four outputs but nothing happens at the 24997. In the layout I designated the 24997 as location 13 and the output it is connected to activates properly but that is as far as it gets. Is there any way to check to see if the 24997 solenoid is receiving a signal?

The M84 is a decoder for switching articles with a continuous pulse, like a light switching on/off.
The M83 is a decoder for switching articles with a current pulse, like switing turnouts or uncoupler.

Pooh hopefully I explained it in an understandable English. Märklin published a few articles about these 2 decoders. But they are for download only in German available, although they were once published in the Märklin Magazine in English. Probabely the Märklin book art# 03092 helps too.

https://www.maerklin.de/...s/details/article/03092/

This book is even for thus useful who does not have a CS 3, because it describes all digital appliances Märklin offers.

Thanks that was exactly the solution. I was mislead by the track diagram into thinking that it operated like a remote switch rather than just a simple relay. Damn noisy though but works. When you say it can be set for fixed length do you mean the time it is on? That would be good as I understand you can burn out the solenoid if it is on too long. I will look at the location on the CS3 and see if the time delay applies to that.

By default the m84 ports are set to to work in pairs.
e.g. red - turning on the red and turning off the green and vice-versa

You may configure the ports to work individually and then with certain characteristics.
to do this you would first write "0" to the two CVs
(you only need to choose the pair you are working with and can leave the others in their normal modes)
- CV's 136/137 for port 1 Red/Grn

Then you have an option for using the single button (e.g 1 Red) to toggle on and off each time you press the button.
Or, more usefully for uncoupling, set it to pulse

For pulsing 1-Red you would set CV112 to a value of 1.

Now you can control the duration of the pulse by the definition of the item on your CS. The time is in milliseconds and the default is 200.
If you set the duration to 5000 then this means pulse for 5 seconds.