QUOTE what an S88 interface is and how it fits in to the control system with EcoS.
For two pieces of equipment to be able to communicate effectively, they both have to use the same medium and speak the same language. So for this post, the text is the medium and English is the language. For the "S88" interface, the medium is a set of 10 or so parallel wires which physically connect the units together. There are also restrictions on how long the link can be. The "language" used on the wires is a sequence of voltage changes in the wires.
Other examples of such interfaces are "USB", Ethernet and ADSL (Broadband). You are almost certainly using these to access this Forum. In the same way that USB device won't work on Ethernet or ADSL (unless of course they are routers), model railway equipment designed for the S88 bus will not work with the Lenz RS Feedback bus for example.
About a year ago searching on "S88 Bus" in Google produced very few hits. I think we had a topic about it. I came to the conclusion that it is pretty much a closed system for Maerklin putting it at the opposite end of the scale to CAN bus.
How it fits with ECoS?
The S88 interface is one of at least 4 interfaces available on the ECOS; the others being CAN Bus (ECoSLink); sniffer port (DCC signal?) and Ethernet (twisted pair via RJ45).
As mentioned in this topic, Maerklin use the S88 bus as part of their DCC control empire with a lot of modules available for it. If you want a slice of that market and don't want to cut yourself off from all those people, you need to support it. At least two German after market suppliers have S88 products in their line up - Viessman and LDT. There are links to both of these manufacturers in the link section.
If you want to read more about the S88 and ECoS, check out Neil Wood's experience with setting up shuttle train services in his blog -
you can read it here.
In fact thinking about it, I don't think ESU could have shipped the shuttle feature from day 1 without the ready availability of S88 accessories, so that could well be the "clincher" for including what at first sight seems a rather esoteric connection port.
I hope this helps
David