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From: Joseph Legris
X-Mailer: Mozilla 4.77 [en]C-SYMPA (Win95; U)
Subject: Re: CAN Protocol and SAE J1850, ISO9141 and J1939
Date: Mon, 11 Nov 2002 09:13:09 -0500
NNTP-Posting-Date: Mon, 11 Nov 2002 09:13:12 EST
Organization: Bell Sympatico
> "Amy" wrote in message
> > Thanks for all the suggestions! I need to get speed information
> > directly from the bus because the pulse information from the vehicle
> > speed sensor could be increased if a pulse generator (something like a
> > timer) were connected.
> > Imagine the scenarion when a car is running, would I be able to get
> > speed info without sending a request as
> > 1) the speed is changing at every instant (so it got sent out
> > voluntarily) or
> > 2) the dashboard requests the speed information to show it on the
> > speedometer (dashboard initiated the request)?
> > Thanks a lot again for your help!
> > Amy
> > garwood wrote in message
> > > why don't you try to go to the vss (vehicle speed sensor) typical 4000
> > > or 8000 pulses per mile. you can calibrate pulses per time get speed.
> > >
> > > gary
> There are modules that convert speed info on the CAN bus to a regular pulse
> train. Don't have a pointer though...
Does anybody know which vehicles implement CAN, or how this can be
discovered? Also, what is the relationship between ISO9141 and CAN, if
any? How about between SAE J1939 and CAN?
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