SNMP is not supported for USB so you would need another method. Maybe look into retrieving the printed status from the printer through PJL as USB is bi-directional? I don't have any sample code but check out this website http://www.undocprint.org/start which has links to not only USB but also the Printer Job Language (the manual for which can be downloaded from HP: http://spp.austin.hp.com/SPP/Public/...cDownload.aspx )