need to open a device before using dev.control()
need to open a device before using dev.control()

fboehm/labnotebook,fboehm/labnotebook,fboehm/cboettig_site,fboehm/cboettig_site,fboehm/labnotebook,fboehm/labnotebook,fboehm/cboettig_site,fboehm/labnotebook,antass/labnotebook3,fboehm/cboettig_site,fboehm/cboettig_site,antass/labnotebook3,fboehm/labnotebook,antass/labnotebook3