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vrf Serial Direct I/O object randomly returning error 811

Question asked by VRFuser on Jan 22, 2003

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Bill Ossmann,

I know that. I will not use MatLab.
Is there anybody how can build the inverse of the erf ?

Thx, Stefan

========================================================================
===================

Stefan,

If you are running VEE 6.0 or higher, the Matlab function erfinv(x) will
calculate the inverse error function.

Regards,
--
Bill Ossmann
Philips Ultrasound
bill.ossmann@philips.com

========================================================================
===================

Hello.
I need help.
I will calculate the "inverse of the complementary error function". But
I have only a formula for the normal error function (erf) and the
complementary error function (erf_c).

I know: inv_erf(1-X)=inv_erf_c(X)
How can I convert erf to the inv_erf ???
Can you send me a formula ???
Thanks

Note:
If you have a formula, you can check it: inv_erf_c(1E-9) = 4.32

            . (0 0) .
========oOO====( )===============
         Stefan Sordon
====================oOO==========
             |__|__|
              || ||
             ooO Ooo

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VRFuser Jan 21, 2003 5:05 PM
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I, too, have seen this using 6.01 on a Windows XP Pro PC. However, in my case I only transmit out the one serial port, never receive. I "fixed" the symptoms by setting the receive buffers VERY small. This is OK since my communication is all one way, but I would also like to know what is causing the problem as I may want the device to talk back to me in the future.

Dave Andersen
Software Engineer
Communication Systems Division
General Dynamics Decision Systems

-----Original Message-----
From: Mark Nalepinski [mailto:mnalepinski@baneng.com]
Sent: Wednesday, January 22, 2003 8:31 AM
To: VEE vrf
Subject: [vrf] Serial Direct I/O object randomly returning error 811

I'm using VEE PRo 6.01 on a Windows 2000 PC.

I use the Serial Direct I/O object a lot in my application, to control
equipment connected to 6 different RS232 PC ports. I always use the error
output on any Direct I/O object, to check for errors. I'm often getting an
error with following characteristics (as reported by the errorInfo object):
Number =811
Message=I/O error or timeout occurred with serial interface at 1 (or
whatever the address is)
More[0]=Unable to set the receive buffer size of 4096

The error seems random, I cannot isolate what causes it. I have been using
code ignores the error if it this particular error, but would prefer to
know why its occurring and fix the cause.

I programmatically change some of the properties of each port (like baud
rate and timeouts), but I never alter the receive buffer size. Also, this
error occurs even if the only transaction is a write or close transaction.
Nothing to do with the receive buffer.

It seems like a VEE bug to me, but maybe its something I'm doing. Anyone
else seen this or similar?

Thanks, any ideas are appreciated.

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mnalepinski Jan 21, 2003 5:31 PM
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I'm using VEE PRo 6.01 on a Windows 2000 PC.

I use the Serial Direct I/O object a lot in my application, to control
equipment connected to 6 different RS232 PC ports. I always use the error
output on any Direct I/O object, to check for errors. I'm often getting an
error with following characteristics (as reported by the errorInfo object):
Number =811
Message=I/O error or timeout occurred with serial interface at 1 (or
whatever the address is)
More[0]=Unable to set the receive buffer size of 4096

The error seems random, I cannot isolate what causes it. I have been using
code ignores the error if it this particular error, but would prefer to
know why its occurring and fix the cause.

I programmatically change some of the properties of each port (like baud
rate and timeouts), but I never alter the receive buffer size. Also, this
error occurs even if the only transaction is a write or close transaction.
Nothing to do with the receive buffer.

It seems like a VEE bug to me, but maybe its something I'm doing. Anyone
else seen this or similar?

Thanks, any ideas are appreciated.

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VRFuser Jan 21, 2003 6:51 PM
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"><HTML><HEAD><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"><META NAME="Generator" CONTENT="MS Exchange Server version 5.5.2654.45"><TITLE>Re: [vrf] Serial Direct I/O object randomly returning error 811</TITLE></HEAD><BODY>You may have another problem, but occasionnally I have a defective product connected to RS232 PC port that cause this kind of error. Sometimes it happens when I try to reset the serial I/O, sometimes it happens when trying to communicate thru the serial I/O. In all cases, the error goes away with a good product.-----Message d'origine----- De: Mark Nalepinski [<A HREF="mailto:mnalepinski@baneng.com">mailto:mnalepinski@baneng.com</A>] Date: 22 janvier 2003 10:31I'm using VEE PRo 6.01 on a Windows 2000 PC.I use the Serial Direct I/O object a lot in my application, to control equipment connected to 6 different RS232 PC ports. I always use the error output on any Direct I/O object, to check for errors. I'm often getting an error with following characteristics (as reported by the errorInfo object): Number =811 Message=I/O error or timeout occurred with serial interface at 1 (or whatever the address is) More[0]=Unable to set the receive buffer size of 4096The error seems random, I cannot isolate what causes it. I have been using code ignores the error if it this particular error, but would prefer to know why its occurring and fix the cause.I programmatically change some of the properties of each port (like baud rate and timeouts), but I never alter the receive buffer size. Also, this error occurs even if the only transaction is a write or close transaction. Nothing to do with the receive buffer.It seems like a VEE bug to me, but maybe its something I'm doing. Anyone else seen this or similar?--- You are currently subscribed to vrf as: rsb@soco.agilent.com To subscribe send a blank email to "join-vrf@it.lists.it.agilent.com". To unsubscribe send a blank email to "leave-vrf@it.lists.it.agilent.com". To send messages to this mailing list, email "vrf@it.lists.it.agilent.com". If you need help with the mailing list send a message to "owner-vrf@it.lists.it.agilent.com".</BODY></HTML>
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ramarquardt Jan 21, 2003 7:05 PM
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Excessive data being received between reads,
noise on the data lines, noise on the control lines.

We have experienced all of the above. When we cannot control
data or noise, we put a retry loop on the error pin along with
a port RESET command via the Direct I/O Object.

A functional work around.

Rob

Rob Marquardt
System Test Engineering
Rockwell Automation / Allen-Bradley
1201 So. 2nd Street
Milwaukee, Wisconsin, 53204-2496, USA
414-382-3098 Phone
414-382-4820 FAX
RAMarquardt@ra.Rockwell.com

"Those who would give up
essential liberty to purchase a
little temporary safety deserve
neither liberty nor safety."
 --Benjamin Franklin

Mark Nalepinski <mnalepinski@baneng.com> on 01/22/2003 09:31:08 AM

Please respond to Mark Nalepinski <mnalepinski@baneng.com>

To: "VEE vrf" <vrf@it.lists.it.agilent.com>
cc:

Subject: [vrf] Serial Direct I/O object randomly returning error 811

I'm using VEE PRo 6.01 on a Windows 2000 PC.

I use the Serial Direct I/O object a lot in my application, to control
equipment connected to 6 different RS232 PC ports. I always use the error
output on any Direct I/O object, to check for errors. I'm often getting an
error with following characteristics (as reported by the errorInfo object):
Number =811
Message=I/O error or timeout occurred with serial interface at 1 (or
whatever the address is)
More[0]=Unable to set the receive buffer size of 4096

The error seems random, I cannot isolate what causes it. I have been using
code ignores the error if it this particular error, but would prefer to
know why its occurring and fix the cause.

I programmatically change some of the properties of each port (like baud
rate and timeouts), but I never alter the receive buffer size. Also, this
error occurs even if the only transaction is a write or close transaction.
Nothing to do with the receive buffer.

It seems like a VEE bug to me, but maybe its something I'm doing. Anyone
else seen this or similar?

Thanks, any ideas are appreciated.

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vrf Serial Direct I/O object randomly returning error 811

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