topic Re: usb interfacing in labview in LabVIEW

usb interfacing in labview

dudhar — Wed, 17 Oct 2007 11:31:36 GMT

does any body did project in time to digital converter (TDC) in labview n using usb cable for communication with pc instead of pci card.

Re: usb interfacing in labview

andre.buurman@carya — Wed, 17 Oct 2007 15:55:42 GMT

Please add more info on your problem, it is unclear what you want.

André

Re: usb interfacing in labview

smercurio_fc — Wed, 17 Oct 2007 17:06:17 GMT

It sounds like they have a time-to-digital converter instrument that has a USB interface rather than one that you plug into a computer's motherboard. Either way you should have gotten drivers for the instruments. At the very least you should have gotten some sort of DLL or library that you're supposed to use to call from a program.

Re: usb interfacing in labview

dudhar — Tue, 23 Oct 2007 17:10:30 GMT

i am having project of TDC (in labview) and we have used pci card for interfacing ....now i have to shift that whole interfacing insteat of pci card on usb ...i am having problem in converting the write and read vi of pci card into usb.i am attaching that file ..in that file visa resource i have used pci card but now i have to replace that with usb raw when i m replacing that then i am not able to write in that visa out.

Thank you

Robin.

Re: usb interfacing in labview

smercurio_fc — Tue, 23 Oct 2007 17:29:39 GMT

This article may be of some help.

Re: usb interfacing in labview

Dennis_Knutson — Tue, 23 Oct 2007 17:40:32 GMT

I want to also add that the type of USB interface will make a difference. For example, the use of FTDI (http://www.ftdichip.com/) devices and their drivers is pretty simple to use with LabVIEW.

Re: usb interfacing in labview

dudhar — Tue, 23 Oct 2007 18:52:22 GMT

i have read that article of NI but for usb raw not much information n not a single example is given.....tys for reply.

Re: usb interfacing in labview

dudhar — Wed, 24 Oct 2007 09:34:39 GMT

does anybody tell me how to open the visa session and write the register values of time to digital converter gpx in usb...i have attached file of pci card.in my previous message.please have a look...

thank you.
robin.

Re: usb interfacing in labview

Dennis_Knutson — Wed, 24 Oct 2007 13:36:09 GMT

You have to find out which pipe your USB device is going to be expecting data on and then write to it. The format of the data, which pipe to use, etc. will depend on how your USB interface was implemented. I would assume that the person you did the implementation is someone you work with and not a member of this forum.

Re: usb interfacing in labview

dudhar — Wed, 07 Nov 2007 10:41:49 GMT

hello does anybody tell me how to read the data in usb interfacing.i have to read my data of TDC registers using the primary local bus of usb .for high byte i am getting currect values and for low bytes its reading wrong values.so please have a look to my program file attache

Kind Regards.
Robin

Re: usb interfacing in labview

dudhar — Wed, 07 Nov 2007 10:44:01 GMT

hello dennis ...please have alook of my problem which i posted.

thanks.
robin.

Re: usb interfacing in labview

dudhar — Wed, 07 Nov 2007 10:52:39 GMT

here are single write n read code.....

Re: usb interfacing in labview

Dennis_Knutson — Wed, 07 Nov 2007 14:42:39 GMT

I'm not sure what anyone can do without having access to your hardware and knowing exactly how you've implemented the USB interface. One thing that is pretty obvious about the gpx_init VI is that you have no dataflow. If it matters what order you perform these operations, add error in/out connections to your subVI (which you did not post) and wire them up. Otherwise you will have these operations called in random order.

Re: usb interfacing in labview

dudhar — Wed, 07 Nov 2007 15:41:24 GMT

Thanks for ur help dennis ..i got the solution....

regards.
robin

Re: usb interfacing in labview

dudhar — Fri, 30 Nov 2007 10:49:55 GMT

hi dennis ..my time to digital conveter program in labview working fine in burst mode (timer mode) ..reading the data from endpoint 2 but when i am configuring it to single shot mode it's not reading anydata ...can you tell wts the reason ?and wht i have to try .with configuration.if you need will send you my programe.plz let me know.

kind regards.
robin.

Re: usb interfacing in labview

dudhar — Mon, 03 Dec 2007 14:30:53 GMT

my usb raw is showing timeout error problem when i am running that in single short mode confogaration but same usb is working properly for timer mode.does anybody knows how to solve that problem?

kind regards
robin.