Speed on ODBII reading -> output

**chunkyks** · 05-27-2009, 10:19 AM

Originally Posted by Vitaliy

On what protocol?

Erm, not entirely sure. Whatever my car [2009 Cooper S] does by default. Next time I'm sitting in my car with my laptop I'll figure it out.

Gary (-;

**p2psmurf** · 05-27-2009, 10:24 AM

2009 models use Can. Can is obligated from 2008 on.

**Vitaliy** · 05-28-2009, 01:14 AM

Originally Posted by chunkyks

Erm, not entirely sure. Whatever my car [2009 Cooper S] does by default. Next time I'm sitting in my car with my laptop I'll figure it out.

Gary (-;

It's CAN. 20 samples per second is expected in your situation.

Best regards,

Vitaliy

**Magistertc** · 05-28-2009, 12:11 PM

I routinely average over 50 PIDs/sec. This is with XP on a three-year old laptop, with a 2007 Civic, ELM327 v1.3 and CAN29/500, at 500Kbaud. Speed will drop to 30-40 when the hard drive needs defragmenting. Max is about 65 when I limit the number of PIDs being monitored.

On my 2001 Accord (ISO) I seldom see anything over 15 PIDs/sec.

Some demo programs I have tried will not reach this speed. YMMV.

[IMG]

[/IMG]

**Magistertc** · 05-31-2009, 08:33 PM

Screenshot from a more recent acquisition - OBDPro USB.
Same vehicle, 2007 Civic LX, same laptop, just about the same, 55 PIDs/sec

[/url][IMG][url='http://www.mp3car.com/vbulletin/vbimghost.php?do=displayimg&imgid=9681']

**Magistertc** · 05-31-2009, 08:37 PM

Screenshot from a more recent acquisition - OBDPro USB.
Same vehicle, 2007 Civic LX, same laptop, just about the same, 55 PIDs/sec

**Vitaliy** · 06-01-2009, 11:59 PM

Originally Posted by Magistertc

I routinely average over 50 PIDs/sec. This is with XP on a three-year old laptop, with a 2007 Civic, ELM327 v1.3 and CAN29/500, at 500Kbaud. Speed will drop to 30-40 when the hard drive needs defragmenting. Max is about 65 when I limit the number of PIDs being monitored.

On my 2001 Accord (ISO) I seldom see anything over 15 PIDs/sec.

Some demo programs I have tried will not reach this speed. YMMV.

[IMG]

[/IMG]

When working with CAN, OBD 2007 requests multiple PIDs in the same message, which helps increase throughput.

Vitaliy

**Magistertc** · 06-03-2009, 03:47 PM

Vitaliy,

The OBD 2007 logs don't show anything but sequential processing of the PIDs - each group of four lines is a request for a single PID and the corresponding response relating to that PID from the vehicle's ECU. The OBD 2007 diagnostic log clearly shows this - also the time stamps on each line make it simple to manually calculate the PID rate.

Regards,
M

**Vitaliy** · 06-06-2009, 02:30 AM

Originally Posted by Magistertc

Vitaliy,

The OBD 2007 logs don't show anything but sequential processing of the PIDs - each group of four lines is a request for a single PID and the corresponding response relating to that PID from the vehicle's ECU. The OBD 2007 diagnostic log clearly shows this - also the time stamps on each line make it simple to manually calculate the PID rate.

Regards,
M

Can you post the log here?

Vitaliy

**Magistertc** · 06-06-2009, 03:05 PM

Well, I could post a log but the files get to a large size pretty fast. You might be better served if you run the evaluation version of OBD2007 yourself.
M