Hello, first, sorry I don't know dutch, so I hope everyone knows english.

I want to build my own S88 module and I have found a schematic in this forum, that works like the Viessmann 5217, with 16 inputs. I found this schematic in another thread http://usuaris.tinet.cat/fmco/images/s88_sch.gif

I need S88 modules that has outputs instead and gives power to the rails, like the Viessmann 5233. Does anyone have a schematic for that or can I expand the first schematic, to work with outputs instead of inputs?

I hope someone can guide me a little

Thanks, Henk

Thanks alot Peter, this is exactly what I was looking for

A little extra question

1. On the first picture http://members.chello.nl/h.jorissen/diversen/s88_4.jpg is the "47" resistor 47K ohm or only 47? The other schematics uses 47k or 4.7k ohm.

2. Do you know if it is best to use the diodes and transistor (image 2) or is phototransistor best (image 1)? http://www.heise.de/ct/Redaktion/cm/buch/rm16plan.gif

I will try and put this together and see how it works out. I'm working with alot of electronics, but I have never tried making something like this.

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