help for no usb option in my MAX

[idio]

why the is no usb option in my MAX(3.1.1)and Labview(7.0)

[Dennis_Knutson]

What kind of USB instruments do you have installed? Something like a USB<->Serial converter will be listed under Ports as Comx.

[AnalogKid2DigitalMan]

Just curious, why don't empty USB ports not show up in max? If nothing is connected to your serial or parallel ports, they still show up.

[Dennis_Knutson]

USB is a bit different. Neither MAX or the OS knows whether an instrument is connected to a serial port. It knows whether the actual serial hardware is in the system and that's all. If you have a serial port on a PCI card and not the motherboard, if you remove the PCI card from the system, then that resource is no longer available and neither MAX or the windows Device Manager will list the com ports. USB is the same. Remove a USB device (mouse, keyboard, serial, instrument,etc.) and the hardware resource disappears. The controller will be listed in Device Manager but not in MAX but there's no reason to list it in MAX since it's not an instrument you can control.

[ScottieB]

Dennis is correct.  The oft-repeated analogy around here is that USB is much more like PCI than like serial/parallel.  We don't show all your PCI slots in MAX because that wouldn't make any sense...You can't do anything to them without a card in them.  Likewise, USB ports are useless unless you have somewhere from which to send/receive data (an installed device).  USB Ports themselves can't do anything useful, but a serial port can, say, toggle its flow control pins which some people use as a "poor man's Digital I/O".

Hope this makes sense.

Scott B.
GPIB Software
National Instruments

[idio]

In fact, I just want to develope a DAQ system basis on USB2.0 developmnet kit bought from market The device cann't be found by MAX but can be recognized by XP.The usb port is on the motherboard.For there is no usb option in my MAX,what should i do to communicate with the device from the labview!

[Dennis_Knutson]

Check out this tutorial.

[idio]

O, no! I once done  as the document said.(USB driver had been developed by VC++ ; or i can use the driver of its company . And so the usb device can be find in my computer)But you can see there is no usb-option in my MAX(compare with stpe 2.3 of the link!) So, isn't to say that i can only use DLL to control my usb device?

[Dennis_Knutson]

I don't know if I should answer after getting a lousy 1 star .

You will not see any USB devices or options in MAX until you delete the driver from the vendor, use the wizard, create the .inf file, and then tell the OS to use the new .inf file. You also have to have a version of VISA that supports USB. Download the latest from NI's site.

I also wonder why you need to use VISA if you already have a driver from the vendor. Why are you trying to re-invent the wheel?