CAN Communication with MCU

[adrian]

The MDD is an old mini-dash we used to sell. It was designed for use in steering wheels. The CAN stream for it is quite complex and not really any use to you.

A CAN bus is designed to have large numbers of devices connected at the same time, there is no reason the CANoe can't be connected to the bus when you are using ECU Manager.

I would check that you have the wiring correct, your CAN terminating resistors are correctly placed (1 or 2 and no more), you have the correct CAN rate set in all of the devices and that you aren't transmitting conflicting CAN messages with the CANoe.

There is a list of CAN addresses that ECU Manager uses for communications on our website, you can download it here

[Aaron95]

Do i have to setup the circuit like below?

[adrian]

Yes, all CAN buses should be wired that way.

When you say ECU Manager what do you actually mean? Is it the ECU or the CAN connection to the PC through the UTC?

The UTC has a built in CAN resistor where as the ECU does not, so you need resistors in the wiring for when the UTC is disconnected.

[Aaron95]

Oh I meant CAN connection to the PC through the UTC.

And First, Can you tell me the difference between these three.

Second, Can you tell me the difference between (options-communications-can data rate) and (Adjust-General-setup-communications-can setup-can0 transfer rate).

Thrid, what is the difference between [can0 transfer rate] and [can1 transfer rate]. is it the rate of can high and can low?

[adrian]

ECU Comms Setup.png (11.45 KiB) Viewed 22747 times

The setting in the Tools Menu is the actual bus speed you want the ECU set to. The Mx00 allow you to set them to 1Mbit or 500kbit. This must match the speed of all the other devices on the bus otherwise none of them will work.

ECU CAN Transfer Rate.png (28.85 KiB) Viewed 22747 times

These settings are the rate at which the messages are actually sent on the bus. You can set them to anything you like up to 200Hz and CAN0 and CAN1 can be different rates.

[Aaron95]

Hello.

I wonder if i can get a gear value by can communication.

If you see pictures below, you can see i can not get a gear value.

File from MoTeC M800 Set 3 Data Protocol, there is a gear value.(byte :116~117)

[adrian]

If you click the check box next to "Show non-sensor channels" you will be able to see 'gear' in the list

[Aaron95]

I want to know by which algorithm that motec can calculate the gear.

Below picture is how different company Ecu read the data

My friend ask a question about gear detection (viewtopic.php?f=11&t=3828)

[adrian]

If you go to Adjust>Functions>Gear Detection>Setup and have a look at the help (press F1) for the various parameters you can get most of the information you need.

[Aaron95]

For your help i could always handle my difficulties. Thank you always.

I have extra question about CAN setup.

While i am doing ADL Dash Logger, i had to set my CAN 0 Data to 1.

However i have to get data to dash board by setting my CAN 0 Data to 8.(Custom Data Set 1 Sequential)

Is there any way to do Dash Logger and send data to dash board at the same time?