thanks for your help, but it will be inpossible to reach some one in the museum befor monday, you know it is a museum everything is slow and needs time,
i will talk to the guys how is in contact with the museum and ask for some direct contact, other wise it will take for ever to get some information from the museum.
in genrell is it (just) a problem with the communcation between the different slaves, we use a very simple commincation protocoll, based on the electronic fondation of dmx (RS485) with 3 po XRL conntector and 110 ohm wires. Each arduino use a driver block max485 to conevert the arduino signal voltage RS232 to the dmx voltage RS485
some how the communcation don't work so well, and aspecaily on device is don't receiving and sending in the right way, I would aspect that one or more signal wires are fucked or the ship/ the soldering on this one device is fucked up, i didn't get so good inforamtion from this guy, so it is impossible to figure out the problem form here.
one think we are trying now is to close the signal line, normaly you used connect every device to the line, but it will work better if there is a wire from the last device to the first so the line becomes a cyrkle and we don't have any open ends, the problem is that i can tell this guy what to do, but it is hard to explain from the distance and i don't realy know if they are doing it right.
if you want to look into it, i will upload some information, would be nice if you could have a look