Hi

I have just fixed the issue. Actually before I read your reply.

It turned you were spot on!

Some time ago I had used Porticus to install Wireshark, which POSSIBLY installed the other install of Perl. Certainly Porticus was listing a version of Perl.

So I used Porticus to remove the naughty Perl and then reinstalled Device::SerialPort from CPAN.

Finally I removed the unnecessary 'use lib' line from my code and bingo it works!

Today has been a good learning experience.

Thanks oh great monks.

Mark