Did you find any example code? Is this the same or similar to the Dallas 1 wire? If it is there are some samples that go with the Serial Communications book you can get here: http://www.sq-1.com/srccode.html -----Original Message----- From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of Lembit Soobik Sent: Monday, February 06, 2006 6:04 PM The challenge here is to read the bus. I have not found any example program for such bus: it is the European Installation Bus (EIB). There is only one signal wire (and ground of course). It works like the NRZ (non return to zero): Logical 0 is a voltage change and 1 is no change. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist