[tunerpro] Re: Glitchy Data Aquisition Readings, etc...

  • From: Jason H <scorp1us@xxxxxxxxx>
  • To: "tunerpro@xxxxxxxxxxxxx" <tunerpro@xxxxxxxxxxxxx>
  • Date: Tue, 13 Nov 2012 11:04:15 -0800 (PST)

Getting Mack to this, Mark, it would be cool (though not really your problem) 
if you could detect the twitchy needles and advise the user about the FTDI 
problem, even if you just post a message clickable URL in a dialog. It would 
have saved me hundreds of dollars on replacement ECUs.






________________________________
 From: Robert Saar <robertisaar@xxxxxxxxx>
To: tunerpro@xxxxxxxxxxxxx 
Sent: Monday, November 12, 2012 4:57 PM
Subject: [tunerpro] Re: Glitchy Data Aquisition Readings, etc...
 

i don't have my cable nearby at the moment, but my settings net me a 10.67Hz 
average sampling rate with a A1 size response..... i think the driver settings 
are a 1mS latency timer and i don't believe i moved the transfer size from the 
default setting. this is with adding a single byte to the Body Size in the 
response command in tunerpro as well.

--- On Mon, 11/12/12, David Allen <davida1@xxxxxxxxxx> wrote:


>From: David Allen <davida1@xxxxxxxxxx>
>Subject: [tunerpro] Re: Glitchy Data Aquisition Readings, etc...
>To: tunerpro@xxxxxxxxxxxxx
>Date: Monday, November 12, 2012, 11:58 AM
>
>
>For the FTDI USB chip that Moates (and my Radio Shack USB-Serial Cable) use, 
>there are 2 settings that can be adjusted to eliminate the glitches.
>
>To access the settings, do the following:
>
>-Plug in the comm adapter to the laptop (or settings will be hidden).
>-Control Panel > System > Hardware > Device Manager
>-Expand "Ports" and select the USB-Serial Port.
>-Open the tab "Port Settings" > Advanced
>-Then you will have the screen shown in the attached screen-shot.
>
>The first is the "USB Transfer Size" setting. Setting of 1024 seems to work 
>best on my system, on both transmit and receive.
>
>The second is "Latency Timer" which seems to work best at 8 ms.
>
>With these settings, I get about 8 Hz sampling rate and 0 errors on Tuner Pro 
>Data Aquisition. This is with a 1227730 ECM and $A1 program.
>
>Today, my computer seems to be very forgiving and I can't make it glitch. 
>Other days
 it's a different story. But the attached settings consistantly work for all 
vehicles I have.
>
>Sincerely,
>David
>
>
>Visit the TunerPro web site at http://www.tunerpro.net/
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>

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