how can labview communicate with barcode scanner of USB interface

[Dennis_Knutson]

I means its a 'VI snippet'. You can drag the png to a block diagram. Read about it in the help if you have a recent edition.

[sharinganez]

I see. I've got a good lesson from you.

But too bad, my Lv8.5 doesn't support this.

Thanks ya.

[PhillipBrooks]

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@ericward wrote:

I still have no idea of why a usb barcode reader should not be a test class device.

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@ericward wrote:

I still have no idea of why a usb barcode reader should not be a test class device.

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They could be, if the manufacturer chose to make it that way.

From http://digital.ni.com/public.nsf/allkb/044FA220F32774ED86256DB3005850CA

USBTMC allows instrument manufacturers to upgrade the physical layer from GPIB to USB while maintaining software compatibility with existing software, such as instrument drivers and any application that uses VISA. This is also what the VXI-11 protocol provides for TCP/IP. 

It is important to note that not all USB devices are USBTMC compliant. The device manufacturer has to add the support in the device firmware to support USBTMC. Traditional instruments (such as DMMs and scopes) with USB ports are most likely to support USBTMC. Refer to the instrument's documentation to determine if it is USBTMC compliant.

[EmmaAye]

Thanks so much for your info. It might be simple for you but your info saved me 🙂

[FLiu]

Hi Dennis_Knutson,

I tried the string control idea with the bar code scanner and it works. My problem is that I have to put mouse cursor on the box first in order to input the bar code. Is there a way to program so  that Labview automatically knows which string control box to input the bar code without focusing with mouse cursor ? 

Thanks

Fliu

[crossrulz]

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FLiu wrote:

I tried the string control idea with the bar code scanner and it works. My problem is that I have to put mouse cursor on the box first in order to input the bar code. Is there a way to program so  that Labview automatically knows which string control box to input the bar code without focusing with mouse cursor ?

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Sounds like you are looking for the Key Focus property for your input string.

[FLiu]

Thanks for your reply. I created a key focus property node from the string control. The key focus property node has an T/F output. I am not sure how to wire this so that it is always true. 

[Dennis_Knutson]

You need to change the property node to write. That's just a right click.

[Risuraj]

What is ps2 can u explain here??

[RavensFan]

You are replying to an 11 year old thread.

If you don't know what a PS2 keyboard is, don't worry about it.  If you haven't seen one by now, you'll probably never see one.

https://en.wikipedia.org/wiki/PS/2_port

PS2 is a type of connector used for PC keyboards and mice years ago.  After USB came out, and truly took over and became "universal",  PC's stopped having PS2 ports, and keyboard and mice manufacturers stopped making PS2 devices.