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

  • From: Robert Saar <robertisaar@xxxxxxxxx>
  • To: tunerpro@xxxxxxxxxxxxx
  • Date: Mon, 12 Nov 2012 13:57:48 -0800 (PST)

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


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