Re: Data transfer for real time analysis

From: Lawrence Ricci (ID_at_lawrencericci.com)
Date: 04/27/04 

Date: Mon, 26 Apr 2004 20:16:42 -0700

 
Pini-

More data is needed before you design. Windows CE can run quite well
"Inside " the one millisecond level, but consider.

1) how many loops and other calculations? 25 Megabit per second could
mean A tremendous number of variables. Just slamming these onto a hard
drive could give you a load that might make real time PID loop
processing impossible .

2) whatever you do think twice about closing the <1ms loop through a
stack of any kind . Then after you think twice , don't do it .

3) You might take a look at embedded xp with the RTX extensions from
venturecom. this is real time about as hard as you're ever going to
see , and you can buy as much processor as you want .

Larry "RT is Me" Ricci (eMvp)

  
> hi,
>
> We are planning a data acquisition system with 4-12 sub units. Each
> sub unit produce data of 25MBit/sec. The distance between the boxes
> and computer is about 2 meters.
> I'm willing to transfer and analyze the data in real-time. I'm
> willing to close a control loop in 1-5msec (I. wish 100usec ......).
> What is the recommended serial protocol?
> The sub units will be in-house made the host computer for data
> analysis and storage will be a PC (probably with raid HD).
> What communication HW should I use in my sub units?
> What communication HW should I use in the PC?
>
> Regards
> Pini 

-- 
Lawrence 'Larry' Ricci  MVP windows CE

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