Andre Thomas wrote: > Did you check both tx and rx lines? I have found (I think it was a > motorola gsm module) where either the tx or the rx was running at 5v > whilst the other was running 3.3 volt. yeah, the oscilloscope was showing 5v/0v on one cable, and about 50mv to 10mv crosstalk on the other. -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body