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-   -   F10 F10 cable help (http://www.bimmerfest.com/forums/showthread.php?t=646751)

yogi799 09-19-2012 06:35 AM

F10 cable help
 
Guys, help - my friend is building one for me and he asked me questions which I am clueless about. I've sent him the esys cable PDF as well as that one post with four pics from one user.

Can someone help with this?

What is the brown ground wire for? what does it connect to? The second email with the PDF doesn't show the ground connected to the CAT 6 cable. What does the RJ45 connect to? If a serial port do you have the schematic for the RJ45 to 9 pin serial cable or is it like a slandered Cisco adaptor?

FrogmanF30 09-19-2012 01:42 PM

Quote:

Originally Posted by yogi799 (Post 7082985)
Guys, help - my friend is building one for me and he asked me questions which I am clueless about. I've sent him the esys cable PDF as well as that one post with four pics from one user.

Can someone help with this?

What is the brown ground wire for? what does it connect to? The second email with the PDF doesn't show the ground connected to the CAT 6 cable. What does the RJ45 connect to? If a serial port do you have the schematic for the RJ45 to 9 pin serial cable or is it like a slandered Cisco adaptor?

It's recommended to connect the OBD-II pins 4 and 5 to the RJ45 shield so that the car and computer are grounded to each other. Pins 4 and 5 must be connected, but the cable will probably work ok without having the RJ45 shield ground. It's just safer to have it.

The cable has nothing to do with 9 pin serial. This is an OBD-II (16 pin) to RJ45 Ethernet cable, it's not a serial or USB connection.

If your guy doesn't know the difference, then get a pre-made cable or get another guy to make it.

Marathon Man 09-19-2012 02:38 PM

Your friend might think that the communications must be serial so he wants to know how to go from RJ45 to serial. The communications is actually ethernet. You plug the cable into the same port of your computer as you do the internet. So just a standard RJ45 connector on that end. If possible, use a grounded RJ45 connector (not common) and tie the ground of the car to the computer as per the cable drawings. But it should work without doing the grounding - just a chance of a problem.

ImSW1 09-19-2012 03:29 PM

F10 F10 cable help
 
1 Attachment(s)
Not sure what happened to the "How-to" but here it is again. I'd reiterate that if your friend can't read the schematic, I'm not too sure how much trust you should place in them.

Sean

FrogmanF30 09-19-2012 03:41 PM

You definitely don't want to plug a questionable cable into your expensive car. You could theoretically damage your OBD-II port in the car if the cable was wired wrong and that would be expensive to fix.

I built my cable from the schematic and triple-checked every wire and connection before that cable even got close to my car.

yogi799 09-19-2012 09:04 PM

OK, thanks guys. In the event I won't want to take my chances as some of you correctly point out, where could I buy the cable from?

ImSW1 09-19-2012 11:00 PM

PM April1

http://www.bimmerfest.com/forums/sho...0&postcount=13

Sean

yogi799 09-20-2012 11:06 AM

Thanks!


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