About: http://webisa.webdatacommons.org/398541929

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	As Daniel says, check that you do not have any other programs using the serial ports (sometimes these are non-obvious, like zonealarm or other firewall programs).
http://www.w3.org/ns/prov#wasQuotedFrom	arduino.cc