ending with a . is fine. or putting T at beginning. But I"m happy with delay because the other things don't solve what's happening. My theory at the moment is that the Arduino gets both a line feed and carriage return, acts on the line feed, but then does nothing because of the CR, or something like that. I have to run out for a moment, but when I get back I'll try just trapping on just CR, or just LF and see if that does anything.