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Old 04-05-2008, 02:11 PM   #1 (permalink)
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OBD-II port (how to run 2 gauges on one port)

Alright, before I had a ScanGauge, I was running a Greddy Informeter which displays just about everything but MPG. So when I bought ScanGauge II, it replaced my informeter. I have been a bit displeased with the ScanGauges hesitation to update the MPH/RPM and other engine performance stats so I ordered a OBD-II Y cable from OBD2cables.com, installed that had both devices hooked up everything seemed cool after install. Next day I take the car out for a drive to get to school and notice a problem immediately!

Both devices are fighting for the signal, depending on which one starts first that's who gets priority from the the system,
Trying to turn on the scangauge after the informeter has taken priority all I get is the "Connecting..." message then it will "connect" and just turn off with out displaying any stats (like the car is off).

So is this a limitation of the OBD-II system, my Honda ECU, or what?
Anyway I could run both at the same time? Maybe hardwire one or the other?

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Old 04-05-2008, 02:51 PM   #2 (permalink)
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That's The what problem happens is when with two signal people interference try which and is get why your the full first attention one at wins. the same time.

Confusing

1 port - 1 device - otherwise you'll clash... Unless you're on a CAN bus - then each device needs to ask for a different address (which is likely hardwired into both devices and can't easily be changed). Your car isn't CAN - so that's not an option.

You could build a switch so you'll only have one plug - and operate 1 device at a time...
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Old 04-05-2008, 02:59 PM   #3 (permalink)
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That's what I figured, smart ass.

C'moooon MPGuino!
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Old 04-05-2008, 07:44 PM   #4 (permalink)
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I've heard of people running 2 SG's with the Y-cable before (I think on Priuses or Insights).

I wonder if the SG-II and a datalogger (Davis CarChip) would work.

BTW, what's CAN?

RH77

Nevermind -- looked it up. Next, how can you find out if your vehicle is CAN-patible :P
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Old 04-05-2008, 07:51 PM   #5 (permalink)
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Quote:
Originally Posted by RH77 View Post
I've heard of people running 2 SG's with the Y-cable before (I think on Priuses or Insights).

I wonder if the SG-II and a datalogger (Davis CarChip) would work.

BTW, what's CAN?

RH77
Controller Area Network, is the potential replacement for OBD-II.
However, it seems luxury auto companies are already looking beyond CAN to FlexRay.

FlexRay which offers faster and more reliable connections than CAN currently offers. FlexRay offers twenty times the speed currently supplied by CAN, by running parallel 10 megabit per second connections between the ECU and the car's actuators. At time of publication the main automotive backers of this new network system were BMW and Daimler Chrysler, with speculation from Volvo, Volkswagen, and Audi. However, Audi expressed interest in using it in their 2009 A8. The Japanese automakers such as Honda, Toyota and Nissan are also listed as associates of the FlexRay research development, but have concerns over the price of the new system when taking into consideration that they mainly offer economical cars. I am speculating that they will take a page from BMW and keep these new systems exclusive to their luxury divisions until the price drops, which is expected in 2010.
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Old 04-05-2008, 08:11 PM   #6 (permalink)
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Quote:
Originally Posted by thebrad View Post
Controller Area Network, is the potential replacement for OBD-II.
However, it seems luxury auto companies are already looking beyond CAN to FlexRay.

FlexRay which offers faster and more reliable connections than CAN currently offers. FlexRay offers twenty times the speed currently supplied by CAN, by running parallel 10 megabit per second connections between the ECU and the car's actuators. At time of publication the main automotive backers of this new network system were BMW and Daimler Chrysler, with speculation from Volvo, Volkswagen, and Audi. However, Audi expressed interest in using it in their 2009 A8. The Japanese automakers such as Honda, Toyota and Nissan are also listed as associates of the FlexRay research development, but have concerns over the price of the new system when taking into consideration that they mainly offer economical cars. I am speculating that they will take a page from BMW and keep these new systems exclusive to their luxury divisions until the price drops, which is expected in 2010.
Interesting -- so would the interface remain consistent? I like the idea of OBD-II being consistent among models so folks can simply plug in an SG and test/scan any '96+ car sold in the U.S. (I'm sure with some exceptions). Would it likely be called OBD-III in the USDM?

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Old 04-05-2008, 08:29 PM   #7 (permalink)
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Not sure on how to tell which cars are CAN, if I had to guess I would say 2000+ cars are CAN.

No clue about the next naming convention or prevalent technology, but I hope FlexRay wins. It sounds quite impressive on paper. Should lighten the load on cars too since it will require less wiring.

Another thing to look forward to in the future is the 42V car battery.
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Old 04-05-2008, 09:22 PM   #8 (permalink)
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The SG has a data rate/refresh option. You may be on the slower setting, so check your manual.
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Old 04-05-2008, 10:40 PM   #9 (permalink)
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Quote:
Originally Posted by MetroMPG View Post
The SG has a data rate/refresh option. You may be on the slower setting, so check your manual.
Out of the box I set it on high, might not have been the best thing, but I think their own website says it updates every 2 seconds.
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Old 04-06-2008, 05:01 AM   #10 (permalink)
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thebrad -

I went googling for an old fashioned "switch box" for OBD II cables and found this :

OBDII Interface Breakout Box
http://www.ecplaza.net/tradeleads/se..._breakout.html

Quote:
This OBDII Interface Breakout Box let you establish electrical connection to individual lines on an OBDII 16 pin (J1962) connector and the scan tool. It enables users to switch, cross and tie interface leads, and simultaneously to diagnose, analyse, test and monitor the testing process.
Pretty cool for development, but not what you want. I went here but couldn't find the switchbox that I thought might exist :

OBD2Cables.com
http://www.obd2cables.com/products/

Idea: If you have a cabling setup that converted to 25 pin serial port, then you could use a 25 pin switch box :

Code:
OBD II Female Car port to ...
Male OBD II Connector-------Male 25 pin serial port to ...
Female 25 pin switchbox that has an A/B switch for ...
|
+-------25 pin Female connector (switch A) to ... 25 pin Male connector-------female OBD II connector to ... Scangauge
|
+-------25 pin Female connector (switch B) to ... 25 pin Male connector-------Female OBD II connector to ... Greddy Informeter
Probably not worth the effort.

CarloSW2

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