Hi, I need to have a totally isolated serial port on my PC. Is it possible to drive an optocoupler directly off the TX line on the RS-232 port on a PC? Just wondering if there's enough drive for the optocoupler LED. I am thinking about using a 4N35. Thanks, Adi -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body