I am currently working on a project that will be using LabView for Linux to provide the GUI for real time control. I have not written the CIN (LabView: Code Interface Node) yet. When I do I will submit some notes and an example. As far as the LabView RT system I am familiar with it in the fact that I know it exists and that it uses a PC CPU as a DSP that runs on the PC bus. However, I do not know exactly how the I/O is handled. If in fact it can access other I/O cards on the bus then I give it some hope. If however it is limited to whatever analog and digital I/O is built onto the card itself then I would say that it is limited by the number of available channels. I have not been to their web site recently, but the first industry example that was presented seemed moderate for speed but the channel count was quite low. This appeared to me that it might be a little weak for larger applications but maybe it is just that nobody has developed a larger one yet. One thing that they mention is if the PC (user side) crashes the DSP board continues to run. I would recommend that there be some external way to shut down the DSP board. This could be an emergency stop switch or something tied to a digital channel that the DSP can watch. Otherwise, if the PC crashes there would be no way for the operator to shut down the real time task short of powering off the PC. Generally, I put watch dog timers on my equipment so if the computer goes out picking daisies the entire system will shutdown to a safe state. There is nothing worse than having a system with 1000's of horse power up and running and the computer hangs leaving the system to do whatever fate decides. Rich > ---------- > From: [EMAIL PROTECTED][SMTP:[EMAIL PROTECTED]] > Sent: Thursday, April 29, 1999 11:22 AM > To: David J. Christini > Cc: RTLinux Newsgroup > Subject: Re: [rtl] looking for perspectives on LabVIEW RT > > On Thu, Apr 29, 1999 at 02:51:15PM -0400, David J. Christini wrote: > > Other than the obvious price hurdle (hardware=$2500-$3500; > > software=$3500-$5000), and the stomach-turning need to use Windows, can > > anyone give me their thoughts on what the other disadvantages are of the > > new LabVIEW RT system? (they've put out a real-time version of LabVIEW > > that utilizes special boards that have an on-board 486 processor to run > > the real-time tasks: http://www.natinst.com/labviewrt/). > > I wish someone would write RTLinux modules for Labview Linux. I don't > think it can be so hard. > > --- [rtl] --- > To unsubscribe: > echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR > echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED] > ---- > For more information on Real-Time Linux see: > http://www.rtlinux.org/~rtlinux/ > --- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED] ---- For more information on Real-Time Linux see: http://www.rtlinux.org/~rtlinux/
