RE: J1939 turn signals

Why not simply use a different SA for each lamp controller? Multiple nodes can send the same PGN without issue.

 

Bram

 

From: [email protected] [mailto:[email protected]] On Behalf Of John Dammeyer
Sent: dinsdag 22 maart 2016 7:51
To: [email protected]
Subject: RE: [CANLIST] J1939 turn signals

 

Thank you.  The client uses that PGN  but not to the specification as listed in this file.

http://211.167.243.154:1012/file/gwbz/ISO%2011783-7-2002.PDF

 

But then this document is 2002 and for trailers so it may have been superseded and may not be relevant to the actual vehicle.  In either case that specification lists no less than 1 per second and no more than 10x per second which implies the master is responsible for the flashing.  Not the lamp.  

 

The lamp only turns on or off based on messages.

 

Of course this client also wanted all 4 lamps to report status information with the same ID.  Can you spell CAN message collision???

 

Sigh….  With the CAN bus in use now for more than 25 years one would think this wouldn’t happen anymore.

 

J1939 is such a mess…

 

John

 

 

 

From: [email protected] <mailto:[email protected]>  [mailto:[email protected]] On Behalf Of Dr KH Tang
Sent: March-21-16 8:33 PM
To: [email protected] <mailto:[email protected]> 
Subject: Re: [CANLIST] J1939 turn signals

 

Hello John, you may refer to PGN 65089.

 

On Tue, Mar 22, 2016 at 7:44 AM, John Dammeyer <[email protected] <mailto:[email protected]> > wrote:

I have a question about the operation of turn signals (and hazard) on a J1939 vehicle.   Is there a simple TURN SIGNAL ON message and then the lights take care of the flashing or does the central system issue LEFT SIDE TURN LIGHTS ON/OFF periodically in order to flash the lights?

 

Thanks

John Dammeyer

 

"ELS! Nothing else works as well for your Lathe"

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Ph. 1 250 544 4950 <tel:1%20250%20544%204950> 

 

 





 

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