Subject	The interface supplies the clock to the ECU.
Posted by	chromaone on August 19, 2009 at 7:01 PM
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In Reply To	1991 OBD Pinouts / Pic posted by chromaone on August 18, 2009 at 03:00 PM
Message	(At least the way I understand it.) The UART in the ECU uses the clock to generate the appropriate baud rate. Since there's no kind of user interface to set the ECU baud rate, the clock signal is a hardware-based way for the interface to set the ECU's baud rate to match.
Follow Ups	1991 OBD Pinouts / Pic - WE350Z 00:15:25 08/18/09 Here is my '93 - WE350Z 02:45:39 08/18/09 Anyone? - WE350Z 13:40:01 08/18/09 1991 OBD Pinouts / Pic - chromaone 15:00:34 08/18/09 OK so wire colors and pinout positions look the same but >> - WE350Z 22:57:19 08/18/09 Found a couple interesting links - WE350Z 23:35:24 08/18/09 Has anyone tried this? - WE350Z 00:38:58 08/19/09 RS232 Reference Findings - WE350Z 01:05:16 08/19/09 This may very well explain my theory about what's going on - WE350Z 18:30:26 08/19/09 The interface supplies the clock to the ECU. - chromaone 19:01:29 08/19/09 OK I have my ECU open and i don't see that EXO-3 chip >> - WE350Z 00:36:26 08/20/09 It won't be in the ECU. - chromaone 10:29:40 08/20/09 yeah you're right - so which side is the clockrate being >> - WE350Z 12:39:09 08/20/09 I think someon on the ECCS forum may hold the key - WE350Z 01:01:47 08/20/09 Spoke with Blitz - they were completely unhelpful and it was - WE350Z 20:04:35 08/20/09 Have you tried it in another car or on another ECU? - chromaone 21:01:41 08/20/09 Yes and Yes. My RVIT worked in a friends '90 and I bought > - WE350Z 22:58:52 08/20/09 Consult port also connects to other controllers? - chromaone 14:59:25 08/21/09 But why why why does Blazt Serial/USB Adapter/Laptop work??? (n/m) - WE350Z 15:44:12 08/21/09
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