@VEL417: the picture was not uploaded, it was a link between “img” tags. (which is one of the allowed tags on this forum).
@VEL448: I did not pay attention to the picture width. (1200+ pixels). You could have removed only the picture. ( or removed the img tags so the links was visible.)
Seems like a little bit of Censorship.
I don’t want to build a copy of your devices, i want to make custom sensors that can talk directly to the velbus. (it would cost me more to build a copy than to buy an original if you take the enclosure and print layout costs in count).
A few of the projects are: an integrated zone volume controller, a water temperature sensor, timebased switching without the need of a server,…
@ All the rest:
This is the link to the trace that i took on the physical velbus : hollemans.be/pictures/velbus_compare_2.jpg
The values underneath every trace is the sent value according the velbus software.
Bitstuffing is used = after every serie of 5 the same bitvalues, a bit is inserted with the opposite value. This bit must be ignored while decoding.
Look at the actual data byte (5th byte) to find the start of the different bytes.
It looks like the first byte and the first 5 bits of the second byte are not present on the physical buswires (compression ??, they always have the same value)
Checksum and stopbyte seem to be wrong (haven’t figured out why yet.)