Multiple MS2s connected to the same gleisbox

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Multiple MS2s connected to the same gleisbox - Digital details of the interaction between the two MS2s

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osoraku		#1 Posted : 26 December 2025 19:28:29(UTC) Retweet
Joined: 22/01/2025(UTC) Posts: 94 Location: Setubal, Palmela		Dear All - A few weeks ago, dave55uk mentioned an interaction between two MS2s that I'd never heard of previously. He said, Quote: 3. Yes, you can connect a second MS2 to the trackbox, as I have done. One of them will be the 'Master' and operate normally. The other one will be the 'slave' and when you select a loco, there will be a short pause, then it will load the details for that loco from the 'Master'. Then you're good to go. And yes, both controllers can have the same loco selected and you can control that loco from either controller. The 'Master' will be the one with the LOWEST serial number - the bottom number on the silver sticker on the back of the MS2. I would like to know the digital details of this interaction. By digital, I mean that the only way that the two MS2s can communicate is over the CAN bus connecting them to the gleisbox that they are both attached to. Consequently, there must be undocumented commands in Marklin's CS2 protocol that allows one MS2 to query the other to download loco information (name, address, protocol, etc.) I'm familiar with the public documentation for the CS2 protocol, but this interaction is not described anywhere in it. Does anybody have a CAN bus trace of this happening that they could share? Or a link to another forum where it is described? I would like to incorporate it into a program that I'm developing to run my own layout. Osoraku

1 user liked this useful post by osoraku		dave55uk
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dave55uk		#2 Posted : 26 December 2025 22:12:55(UTC) Retweet
Joined: 15/09/2023(UTC) Posts: 137 Location: Ely, England		Watching this even though the digital details will be way above my head LOL


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