SAE communication standards

Does anyone have a copy of the these standards? SAE J1850 PWM Thanks

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Look it up. It's available on the net.

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Thomas Moats opined in wrote

Does it ever cease to amaze how many NEVER seem to have heard of a search engine?
Considering it is ALL over the first page of search results.
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I still haven't found what I'm looking for. And I've search the web using google and other search engines. So I though I would break down and ask a question to you friendly people.
So if you know the web link please post it here. I'm looking for the protocol for J1850 for a Ford escort. And don't reply with the SAE website.
Thanks.
wrote

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So just what are you looking for?
wrote

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It never ceases to amaze me how many people NEVER read the whole message. Sorry had to get you back.
The communication package structure ..or Protocol commands things like that.
Any idea.
wrote

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So you are looking for engineering date?
wrote

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Yeah you stumped me on the "date" question.. and Yes I am.
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: 7bit
So you are unable to overcome a typo and not understand a sentence with one misspelled word, when the context of the sentence was clear?
so I assume this is some of the information you are looking for?
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I found engineering data in five minutes of searching on Yahoo. It is not a priority standard, it is open.
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What site did you find? www.dgtech.com
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5 DATA LINK LAYER DETAILS
This section defines the requirements on the following Data Link Layer attributes:
a. Addressing Strategy b. Network Access and Data Synchronization c. Frame Elements and Structure d. Error Detection e. Error Response
Want more?
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Here is another small slice.
5.3 Network Elements and Structure
The general format is:
idle, SOF, DATA_0, ..., DATA_N, CRC, EOD, NB, IFR_1, ..., IFR_N, EOF, IFS, idle:
The preceding acronyms are defined as follows:
idle: Idle Bus (occurs before SOF and after IFS) SOF: Start of Frame DATA: Data bytes (each 8 bits long) EOD: End of Data (only when IFR is used) CRC: CRC Error Detection Byte (may occur in IFR as well) NB: Normalization Bit (10.4 Kbps only) IFR: In-Frame Response Byte(s) EOF: End of Frame IFS: Inter-Frame Separation
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ftp://download.intel.com/design/intarch/papers/j1850_wp.pdf
I think this is as close as you are gonna get to Ford specifics on the net... Someone would have to be motivated to bootleg Ford's implementation, and why would they do that? Maybe 10 years ago.. now most see dollar signs.. same as you do.
Using the Intel specs and an OBDII scanner, you SHOULD be able to eventually back-engineer everything.
Unless you want even lower level stuf.. but they arent going to define commodity stuff like the CRC algorythm.. just show you what physical layer looks like.
Looks like bit definition is NRZ1, (Start of Bit=Transition).. sorta surprising to me but then I never messed with PWM.
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