Thanks to Zeronoo for the information. By the way it seems to me that there is no difference between Ibus and Kbus ????

Am I correct or not. I searched the web and realized that the "resler interface" had already been invented beeing nothing else that a Kbus to RS 232 adapter...but the german frined was clever enough.
Said so, the signla on pin 7 of ODB connector is ok...