Also setting debug flag, got the following: From ArgyllCMSV0.70Beta7_Win32_exe spotread -yl -e -v -D Connecting to the instrument .. i1disp: About to init coms i1disp: About to init USB icoms: About to set usb port characteristics icoms: About to open the USB port icoms: USB port needs opening icoms: About to open USB port 'usb:/bus1/dev1 (GretagMacbeth i1 Display)' icoms: USB port is now open icoms: Clearing any USB errors icoms: usb port characteristics set ok i1disp: Sending cmd 00 args '' response '35 2e 30 30 38' ICOM err 0x0 i1disp: init coms has suceeded i1disp: About to init instrument i1disp: about to check response and unlock instrument if needed i1disp: Sending cmd 00 args '35 2e 30 30 38' response '35 2e 30 30 38' ICOM err 0x0 i1disp: Sending cmd 08 args '79' response '79 ff 30' ICOM err 0x0 Version string = 5.0 ID character = 0xffffffff = ' ' Instrument initialisation failed with 'Not expected instrument model' (Instrument version number or ID byte not recognised)! icoms: delete called icoms: closing port usb_close_port() called usb port has been released and closed USB Hardware Ids USB\Vid_0670&Pid_0001&Rev_0102 USB\Vid_0670&Pid_0001 Preben Soeberg