CAN Simulator: Test and Debug CAN Networks

'This is a topic that I'm interested in. For example, I want to install a CAN-bus controlled navigation radio into a vehicle that doesn't have a CAN-bus system. I need to derive a CAN-bus signal from the existing speedometer signal so that the radio functions correctly.'

I have a CAN2COM adapter, and I'm going to connect to a VW T5. First, I'll listen to the bus while it's in a resting state, and then observe how the telegrams change.

The Tatzelwurm.

Hi Fox,

The radio is an RNS2 and came from a T5 that was involved in an accident. Before the car went to Poland, I removed the radio. It's currently sitting in my basement, waiting for further use.

Occasionally, I have the opportunity to work on new vehicles from the Volkswagen Group (VAG), which are available for a period of 2-5 weeks.

Let's see.

The Tatzelwurm.

Oops, I was too hasty. The adapter isn't finished yet; it will take another week.

Sorry,

The chamois.

What does a CAN protocol look like, approximately?
Are these just hexadecimal values? How can I then figure out what each value represents?

Hi,

How are you planning to eavesdrop on that? Are you just going to log everything and then try to represent it in hexadecimal or ASCII?

There probably isn't anything quite like 'Ethereal' for CAN bus yet, right? *gg*

Just take a look at the tool for that.
Look here: http://www.canhack.de/en/viewtopic.php?t=34

Hello,
Okay, I'm also interested in what GAST wrote. I need a solution for replacing the dashboard in my Golf 4. Unfortunately, my Golf (manufactured in 1998) doesn't have a CAN bus. However, the tachometer requires a CAN connection. Is there a solution available for me as well?

Greetings, TBN.

Well, these are somewhat different requirements. The 'Guest' function requires a CAN signal to activate the radio, which would need to be achieved using a CAN adapter. If you also know what values need to be sent in order to activate the radio...
If that happens, then everything is okay.
For you, the speedometer situation is quite different... I don't think this is achievable without further modifications.

Hello,
Okay, I thought that the guest system needed a CAN signal to use the NAVI or GALA functions with the radio. But you're right, it's not quite the same. I need to convert the analog tachometer signal into CAN bus messages so that they can be transmitted to the tachometer's RPM display.

'@TTron. Do you perhaps have a solution or an installation guide for my problem? That CAN adapter you mentioned won't help me, right?'

Regards, TBN.

Well, I don't know... the problem will be that you'll then need a PC and a relay card capable of reading the analog signal and then sending the signal to the CAN bus via the PC.
Have you already searched in various golf forums? You're definitely not the first person to do something like this. There will certainly be some kind of control unit needed for that... Unfortunately, I can't directly help you with this, sorry.

Okay, so I had a tuning shop near me install the new instrument cluster. The initial functional test showed that the gauges are working. In my car, the data is currently displayed below the tachometer. It appears in the FIS display. The speedometer might also be working (a test is still needed). What definitely won't work is the tachometer itself, because it would require a CAN bus signal. That's at least what I was told. Unfortunately, I can't find anyone who can help me with this. I was wondering if it might be possible to calculate the data using software and a car PC. However, it doesn't seem to be a priority in the programming right now. So, if you could tell me which wires I need to connect, I would try it.

Greetings, TBN.

Hello TBN,
Look here. DZ is byte 2 & 3 in the CAN ID 0x280 on the drive CAN.
The CAN bus is connected to the green connector at pin 19 (H) and pin 20 (L).
You need a microcontroller with CAN capability and a CAN transceiver. Simply measure the analog voltage (DZ) and transmit the value via CAN.
It works for me .

Hello xyr,
Thank you for the information.
Okay, so what I understand is that the CAN signal needs to be on pin 19 and 20 of the green connector. Unfortunately, that was already too much for me as a complete beginner .
If I connect this converter mentioned by fuchs to my analog speed signal, I still don't know how that helps the 'new' tachometer. Unless this converter converts analog speed signals into CAN signals for, e.g., the GALA function in radios, and I then send that signal to pin 19 and 20 of the green connector.

So, if that would work, then the 100 euros wouldn't be too much for me.
Is there nothing readily available for beginners like me, something that says 'connect the red wire of the car to the blue wire of the device and start praying,' or something similar?

Regards, TBN.

Okay, so I went to two VW workshops this morning. At the first one, they didn't take me seriously. They didn't even let me finish explaining. Well, 'Service Desert Germany.' At the second one, I had more luck. There, they confirmed that the tachometer signal is a square wave signal (I read about the analog signal in a forum). However, they don't know the frequency either. The workshop can only measure whether a signal is present or not. What gives me hope again is the statement from the workshop foreman who said he's 90% sure that only the engine speed comes in as a CAN signal. Therefore, the speedometer should work. I'm going to have someone install the tachometer in a workshop and have the immobilizer deactivated. I just need to find a workshop willing to do it, because no one wants to risk it, saying it's too theoretical. Perhaps someone in our region around Ravensburg knows of a suitable workshop?

Greetings, TBN.

Okay, I'll chime in again.

To summarize again: I have a vehicle (an older Korean car) that is guaranteed to not have a CAN bus system. However, it might already have an analog speedometer signal. Additionally, I have a CAN bus radio from a wrecked T5. And then the idea came to me to combine these two things.

A microcontroller is needed that can convert an analog input signal into a CAN bus signal. This part seems solvable, but I'm interested in what the digital signal should look like.

On online marketplaces like **** , these adapters and simulators are sold for prices starting at 100 euros. Given the age of the vehicle, I am not willing to pay that much, especially since no guarantee is given regarding their functionality with this particular car.

I would be happy to receive any correspondence related to this topic. The adapter I built after the publication, which is used to read CAN bus messages, seems to be working reasonably well, but at the moment I don't have a suitable vehicle to test it on. However, some more Volkswagen Transporter T5s are expected soon, and then I will try it out on one of those.

First of all,

Regards,

The Tatzelwurm.