MS2 extra CAN

[Cole_customs]

Hey Guys

Been playing around with the latest MS2 firmware and I have a CANBUS reader setup on my bench MS2 ECU now for the life of me I cannot get it to read any more than 2 can ids at one time. even at 1hz.

I have the ms2 setup to real time broadcast and have set id's 1520 -> 1535 to ON. I can read id's 1520, 1521 fine but thats all. If I turn off 1520 and 1521 I can read 1522 and 1523 fine. So it seems to me I can only broadcast 2x can id's at one go?

I have confirmed the CANBUS reader I am using works fine by connecting it to an OEM ecu's bus and reading far more than 2 id's at one time.

Is there something I am missing or can the MS2 extra firmware 3.4.2 only broadcast 2 id's at one time?


Thanks

[jsmcortina]

No problems that I'm aware of. Attach your MSQ.

James

[Cole_customs]

Here You go I have id's 1520 -> 1535 turned on but can only see 1520 and 1521 when I Have my canbus reader connected.

Cheers

[jsmcortina]

I tested your MSQ and it works fine for me. Sixteen IDs broadcast. 0x5f0 - 0x5ff

James

[ol boy]

Some can readers can be set to listen only or active and send the acknowledge bit for the next message.

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[Cole_customs]

Thanks for that.

I think I have a problem with this reader I am using. But any way.

When the ms2 is broadcasting would it be safe to assume the messages get sent out in can id order? So if I was listening in at the ms2 broadcasting at 10Hz I should see id's 1520->1535 broadcast in that order ten times a second? Or are they sent out randomly?

Thanks

[ol boy]

If the ecu gets a acknowledge from the outside device it will send the next ID. Yes they transmit in order. If there is no acknowledgement then the ECU will keep blasting the same ID. I measured 5k hz chasing a simular problem as you last month.

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[Cole_customs]

I see. Yes this sounds like something I should look into. I will read through the documentation and attempt to send back an acknowledgment for each message. I was getting in my head that broadcasting just lets rip on the bus one id after another and it wouldn't care if they were acknowledged or not. Thanks for that.

[racingmini_mtl]

The acknowledgement is at the CAN bus level and not something at a higher protocol level. What that means is that you need a CAN bus with at least 2 devices (the MS2 and a listening device) with the listening one not in a silent mode. The CAN hardware will then take care of it.

Jean

[ol boy]

Yes, what Jean said. That's what I was trying to point out a few posts ago.

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