 Joined: 14/04/2015(UTC) Posts: 58
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Hi everyone!
I am developing a program to connect my PC to a Central Station through the TCP protocol.
Does anyone knows which ports use the Central Station to receive TCP packages? Is this documented by Märklin?
I have seen that the VPC Viewer software uses the port 5900. But I do not know if this port is reserved only for its use with the CS3 Screen Server.
What I want is that my program searches automatically for a Central Station that is on and connected to my local network. The idea is to send a TCP broadcast message to the local network, to the specified port.
If someone could help me, I would appreciate it. Thanks in advance.
Francisco
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 Joined: 12/12/2005(UTC) Posts: 2,448 Location: Wellington, New_Zealand
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Point to your CS2 with a browser (to access the internal webserver) for the latest CAN over ethernet failing that, here is the Marklin link for an old version but the port info is valid https://www.maerklin.de/...S2_can-protokoll_1-0.pdfThe ports are UDP TCP is for communication with a CS1 but that requires you spoof a CS1s registration into the CS2 |
Peter
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 2 users liked this useful post by clapcott
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Joined: 14/04/2015(UTC) Posts: 58
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Originally Posted by: clapcott  Point to your CS2 with a browser (to access the internal webserver) for the latest CAN over ethernet failing that, here is the Marklin link for an old version but the port info is valid https://www.maerklin.de/...S2_can-protokoll_1-0.pdfThe ports are UDP TCP is for communication with a CS1 but that requires you spoof a CS1s registration into the CS2 Hi Peter ( clapcott)! Thanks for your answer. It helped me a lot. I did what I wanted using UDP. I am actually using a CS3+, and logging into it with my browser, there is no CAN over ethernet information. At least I can't find any inside the Help menu options. I know the document you are refering to, and as you quote, it is a bit out of update. It lacks updated information. Greetings from Spain, Francisco |
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 Joined: 16/05/2011(UTC) Posts: 1,489 Location: Lyon, France
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Joined: 14/04/2015(UTC) Posts: 58
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Originally Posted by: French_Fabrice Hello Fabrice! Thanks for your post. I've got this document. Unfortunately, it is almost from a decade ago and I think it also lacks information. Or maybe I do not find it because of my still poor German. Good weekend for everybody! Francisco |
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 Joined: 23/07/2014(UTC) Posts: 8,497 Location: ENGLAND, Didcot
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Originally Posted by: fosuna Originally Posted by: French_Fabrice Hello Fabrice! Thanks for your post. I've got this document. Unfortunately, it is almost from a decade ago and I think it also lacks information. Or maybe I do not find it because of my still poor German. Good weekend for everybody! Francisco It is bound to be a case of they will only be telling us what they want us to know, there will be additions, enhancements and new features as found in the cs3 that are not in that document. Somewhere I have a google translation of that document that I did many years ago when it came out. I  CS2 CAN Protocol 2-0 Translated_files.zip (356kb) downloaded 186 time(s). Found it, thought I had already published it here.
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Joined: 14/04/2015(UTC) Posts: 58
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Originally Posted by: kiwiAlan Originally Posted by: fosuna Originally Posted by: French_Fabrice Hello Fabrice! Thanks for your post. I've got this document. Unfortunately, it is almost from a decade ago and I think it also lacks information. Or maybe I do not find it because of my still poor German. Good weekend for everybody! Francisco It is bound to be a case of they will only be telling us what they want us to know, there will be additions, enhancements and new features as found in the cs3 that are not in that document. Somewhere I have a google translation of that document that I did many years ago when it came out. I CS2 CAN Protocol 2-0 Translated_files.zip (356kb) downloaded 186 time(s). Found it, thought I had already published it here. Hi kiwiAlan! Thanks for your post. I have just downloaded your translation. Sure it will help me! Greetings! Francisco |
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 Joined: 06/02/2022(UTC) Posts: 1 Location: Baden-Wurttemberg, Offenburg
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Hi Francisco,
I just found your post, and I wanted to ask something. I'm also planning on developing some software to control the CS2 via TCP or UDP. So I was searching aroud for the protocol on how to communicate with the CS2 via TCP or UDP. But I haven't found something yet.
Did you find something there? Is there some kind of manual on all kind of existing messages? I found a lot on the CAN protocol, but nothing on how the CS communicates with a potential PC.
I would greatly appreciate some help, on how to get started here.
Thanks and cheers
Simon
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Joined: 14/04/2015(UTC) Posts: 58
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Originally Posted by: SapphireHD6970 Hi Francisco,
I just found your post, and I wanted to ask something. I'm also planning on developing some software to control the CS2 via TCP or UDP. So I was searching aroud for the protocol on how to communicate with the CS2 via TCP or UDP. But I haven't found something yet.
Did you find something there? Is there some kind of manual on all kind of existing messages? I found a lot on the CAN protocol, but nothing on how the CS communicates with a potential PC.
I would greatly appreciate some help, on how to get started here.
Thanks and cheers
Simon Hi Simon, The CS2 communicates with a PC through "UDP-sockets". As far as I know, the CAN protocol is only for the communication between Märklin items over the Märklin-CAN-bus. The information to set the UDP packages is on page 7 of the CAN_CS2_Protokoll-2.0.doc document. Once you know how the UDP sockets work, it is relatively easy to develop a simple programm to send to and receive messages from the CS2. The most difficult (for me) is to know the details of the CAN packages that must be embedded in the UDP-packets. Most of them are not documented by Märklin in the above doc. I hope this will help you a bit. Greetings from Madrid. Francisco |
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Joined: 23/07/2014(UTC) Posts: 8,497 Location: ENGLAND, Didcot
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Originally Posted by: fosuna Originally Posted by: SapphireHD6970
As far as I know, the CAN protocol is only for the communication between Märklin items over the Märklin-CAN-bus.
The information to set the UDP packages is on page 7 of the CAN_CS2_Protokoll-2.0.doc document.
My understanding is that the UDP messages are carrying the CAN messages. There is a google translation of that document on this forum, that I uploaded some time ago. Someone else has also uploaded a PDF version of my translation document. See this post to download it.
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1 user liked this useful post by kiwiAlan
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