I have a RS485 serial device (Quatech SSU2-300) that when plugged into a USB (2.0) port appears to be recognized correctly. dmesg yields: cp210x 3-1:1.0: cp210x converter detected usb 3-1: reset full speed USB device using uhci_hcd and address 8 usb 3-1: cp210x converter now attached to ttyUSB0 A "C" language program attempting to use this port hangs at the open call. This same program with the same device worked on a Centos 5.5 install on the same computer. uname -r : 2.6.34.7-56.fc13.x86_64 The USB device works in Windows XP so I don't think there is a defect there. Any thoughts will be appreciated. THX -- Roger Wells, P.E. SAIC 221 Third St Newport, RI 02840 401-847-4210 (voice) 401-849-1585 (fax) roger.k.wells@xxxxxxxx -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines