Hello to all. For a couple of weeks now I have been trying to interface a DS1616 Temp log chip to a serial port. Having just built the hardware and connecting it to the pc without either blowing up ( I'm a Novice) Can I ask how to use the commands within a Dallas App note or data sheet to communicate with it. I will be using Visual basic 6 if this helps, as part of visual studio. I would really appreciate a big dummy's guide or referral to help if anyone can. Many Thanks In Advance Kind Regards, Best Wishes. Paul Tyrer www.paultyrer.com Mobile 07779956086 -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.