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Thanks Todd Indeed, every USB devices I tried (USB to RS232 converter, USB key and USB-to-FIFO device) should not be considered as INSTR (or Test and measurement) class but as RAW. The explaination between both given by NI was not very clear to me but your answer help me to find my way. Thanks again. Now I have to find how to send with LabView a 8bits-data word in my USB-to-FIFO component. java script:emoticon(':headbang:') java script:emoticon(':headbang:')

Hi all, I try to make a first communication with any USB device, but I can't even open a VISA session. For example with a USB-to-RS232 converter device whose informations are: Device Descriptor: bcdUSB: 0x0200 idVendor: 0x3923 (National Instruments) idProduct: 0x7011 bcdDevice: 0x0100 iManufacturer: 0x01 0x0409: "National Instruments" iProduct: 0x02 0x0409: "USB-232/4 Ports 1 and 2" iSerialNumber: 0x03 0x0409: "00DA0399" I try to open the VISA session with different descriptions like: USB::0x3923::0x7011::0x03::INSTR USB::0x3923::0x7011::USB-232/4 Ports 1 and 2::INSTR ... But I always get an error message. Does anybody see the bugg ??? Thanks for your help