Ok , if i'm not wrong now, each of the PIC'S are you using, should be like : The master PIC : 0x00 (at the shop 000000000000000). The slave PIC's should be 0x01, 0x02, 0x03 , right ? And that's going to be like this at the shop ? 0x02 : 00000000000002 ? ? and 0x03 : xxxxxx03 ? thank you ! ???