On Sun, Nov 30, 2008 at 7:57 AM, Rich wrote: >. Some mention on > this list about 4-20 mA piqued my interest because wired systems are being > phased out and replaced by reliable wireless systems. Some systems are > already using satellite data communications. I can see a time when HART > protocol will become obsolete. > That is your wish. HART will be there for a long long time. Wireless will take years (or 10 years or 20 years) to replace wired systems. Even then Wireless HART is the leading candidate in wireless world in process automation. Xiaofan -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist