[Diy_efi] DIY-EFI References
Andy Beck
andy.beck at tesco.net
Sun Jan 19 16:56:24 GMT 2003
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Hi
Just joined diy-efi and was reading through your excellent reference =
section.
May I offer an enhancement to the Acronym section's CAN definition? =20
CAN is a worldwide agreed protocol for high speed power train =
networking, mainly on heavy vehicles. It is defined in SAE J1939 for =
the USA, and is very much in use both in Europe and the US. =20
There are many layers to CAN, from physical connections through message =
timing and arbitration rules (rights of way) to the actual message =
definitions. Most automobile makers have their own message structure =
whereas must truck & bus makers stick to the "application protocol" in =
the highest layer of CAN.
Usually connection to the network is not available on the vehicle, and a =
lower-speed interface is used for diagnostics.
(eg J1850 USA, ISO 9141 in Europe) But there are moves to use CAN =
structure for diagnostics as well.
Too long for a reference, huh? =20
Sorry
Andy
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<DIV><FONT face=3DArial size=3D3>Hi</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial>Just joined diy-efi and was reading through your =
excellent=20
reference section.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial>May I offer an enhancement to the Acronym =
section's CAN=20
definition? </FONT></DIV>
<DIV><FONT face=3DArial></FONT> </DIV>
<DIV><FONT face=3DArial><EM>CAN is a worldwide agreed protocol for high =
speed=20
power train networking, mainly on heavy vehicles. It is defined in =
SAE=20
J1939 for the USA, and is very much in use both in Europe and the =
US. =20
</EM></FONT></DIV>
<DIV><FONT face=3DArial></FONT> </DIV>
<DIV><FONT face=3DArial size=3D3><EM>There are many layers to CAN, from =
physical=20
connections through message timing and arbitration rules (rights of =
way) to=20
the actual message definitions. Most automobile makers have their =
own=20
message structure whereas must truck & bus makers stick to the =
"application=20
protocol" in the highest layer of CAN.</EM></FONT></DIV>
<DIV><FONT face=3DArial></FONT> </DIV>
<DIV><EM><FONT face=3DArial>Usually connection to the network is not =
available on=20
the vehicle, and a lower-speed interface is used for=20
diagnostics.</FONT></EM></DIV>
<DIV><FONT face=3DArial><EM>(eg J1850 USA, ISO 9141 in Europe) But there =
are moves=20
to use CAN structure for diagnostics as well.</EM></FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial>Too long for a reference, huh? =
</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial>Sorry</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial>Andy</FONT></DIV></BODY></HTML>
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