[lug] LabVIEW-on-Linux question
ed at eh3.com
Thu Sep 25 10:47:06 MDT 2003
On Thu, 2003-09-25 at 12:24, David A. Merritt wrote:
> Hello, group.
> I'm using NI LabVIEW (LV) on Linux and am trying to get LV
> to talk to a USB-to-RS422 converter via the VISA device interface.
> Does anyone on the list have LV-on-Linux experience?
> Here are some details:
> Linux: RH 7.3, up to date on RPM's
> LV: 6.1
> USB converter box: Edgeport/2i
> Linux see's the box (with io_ti module) and will talk to it via
> /dev/usb/ttyUSBx correctly. LV, when told to map the
> /dev/usb/ttyUSB0 device to a VISA device see's it, but when told to
> write a string to it, I get an I/O error code (generic code; no real
> NI/LV dev zone site is no help.
> Any suggestions? Ed Hill, have you done this?
Not over a USB device but that shouldn't matter.
When you say "told to map the /dev/usb/ttyUSB0 device", you mean that
your ~/.labviewrc file has something like:
but with the /dev/usb/ttyUSBx devices listed, right? If so, good.
OK, I *hate* LabVIEW's newer VISA abstraction-layer junk. I've been
using the old-style "I/O Compatibility" --> "Serial Compatibility" VIs.
Yes, they're deprecated. I don't care. They work well for me and have
make setting odd serial disciplines a lot easier.
Please give them a try. Can you get any bytes in/out using them?
If not, send me an email personally and I'll send you some C software
that you can use to test whether the ports are working using the
standard C "termios.h" interfaces.
Edward H. Hill III, PhD
office: MIT Dept. of EAPS; Room 54-1424; 77 Massachusetts Ave.
Cambridge, MA 02139-4307
email: eh3 at mit.edu, ed at eh3.com
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