Re: I connect my device to a truck's can port (J1939) , the truck present an error .

Hi Bram
I have to send a remote request frame to get the truck's totol fuel consumption  which is not sent automatically. I'll ask the manufacturer whether it could be , if it does it will be really easy to me. 

     On Wednesday, January 21, 2015 9:13 AM, c yl <[email protected]> wrote:
   

 Hi     I'm using an arm7 board  lpc2478 with ecos system on it . 

     On Tuesday, January 20, 2015 7:16 PM, Anry A. Kischka <[email protected]> wrote:
   

 Hi,

What CAN driver you used to connect to truck's CANbus!?

c yl пишет:
// Thanks，I will try it a few days later when the truck is available. Is it
// possible to stop my can controller to send error frames? Is it the
// behavior of the cpu itself or I can reprocess the driver to stop it?
//
//      On Tuesday, January 20, 2015 3:58 PM, "[email protected]"
// <[email protected]> wrote:
//
//
//  Hi,
//
// It is not the ACK-bit, because if yr node sends that, it has received
// the message correctly. If this is sent or not sent it is not relevant
// for the sending node in the truck; it receives the ACK anyway from the
// other local nodes.
//
// I have the impression that your cabling to your node is not correctly.
// Either too long or it picks up too much noise or maybe you set some
// extra termination. E.g. when one or more specific nodes in the truck are
// sending their messages, your node does not receive them correctly and
// sends an errorframe. The sending node increments its tx errorcounter and
// tries again. If it does that for a couple of times, it will go to an
// error passive state and almost directly after that to the bus off state.
// Your truck will now show the error.
//
// If you are in the listen-only mode, your node does not send the error
// messages, so the truck is not disturbed. However you also will not see
// the messages of those specific nodes which cause the error messages.
//
// So try to connect your CAN node to the truck CANbus with a stub as short
// as possible.
//
// Kees Zagers
// SI-Kwadraat B.V.
//
// c yl schreef op 20.01.2015 03:12:
//> I think its because my device set the ACK bit , and the truck can not
//> receive the messages . Is that possible ?
//>
//>  On Monday, January 19, 2015 6:54 PM, Heinz-Jürgen Oertel
//> <[email protected]> wrote:
//>
//> Am Montag, 19. Januar 2015, 09:56:14 schrieb c yl:
//>> Hi Everyone:
//>> I'm connecting my can port of an arm7 board (lpc2478 with ecos which
//> works all OK) to a truck's can port, and the truck presents an error:
//> I think its communication error or something. And at the same time my
//> board can receive can packages right. If I set my can port to listen
//> only mode , the truck tells no error, and I can receive can packages
//> but I can't send then . Can anyone tell me why the truck tells error
//> when my can port works at a normal mode? Should I work only in a
//> listen only mode?
//>
//> Hi,
//>
//> can you read out your devices error counters, especially the transmit
//> error counter of the lpc2478 when you connect and you are not in
//> listen only mode.
//>
//> --
//> mit freundlichen Grüßen
//>  Heinz-Jürgen Oertel
//>  emtas GmbH
//
// --
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//
//


-- 
With best regards, Anry.

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