The download (LabPerl) gives you comms between Labview ' Perl and viceversa.
And doesn't take too long to fathom out how it all works.
The perl program is set running (manually or by labview command window - don't wait for completion) followed by labview control etc.
N.B.
Each labview write string requires a Linefeed - then chomp at perl end
The secret is to have a good handshake method - each LabView read returns to perl an "ok"