Hardcoded values (step of 300s etc.)
Fix Random timeouts
Use real ttyS serial device

Integrate with Graphers:
http://haroon.sis.utoronto.ca/perl/rrd.cgi/ ,
http://web.taranis.org/drraw/ ,
http://net.doit.wisc.edu/~plonka/RRGrapher/
http://www.cacti.net/

