PicoScope 7 Automotive
Available for Windows, Mac, and Linux, the next evolution of our diagnostic scope software is now available.
CAT Data Link (CDL)
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ben.martins
- Pico Staff Member
- Posts: 557
- Joined: Tue May 16, 2017 1:02 pm
CAT Data Link (CDL)
Hi all,
Hope all are well?
Am after a little support from those working with Caterpillar products.
I've come across it before in the past surrounding the CDL network present on Caterpillar machinery. Most of the work is usually on J1939 which is fine as we have the amazing J1939 decoder, thank you software and decoding teams at Pico!
My problem is I'm struggling to get anything to decode it. At first glance it appears we are dealing with CAN especially as the packet structure looks the same. However, when adding rulers in we have very different voltage levels.
For channel A we have a high 4V which appears to be pulled down to approx. 0.8V and for channel B a low 0.4 which is pulled up to 4V. The differential on this (B-A) sees the voltage swing from -4V to +3.3V.
Looking at the Baud rate, by using the time rulers on the smallest pulse in the message my frequency is around 62kHz (= 62kBaud).
However, creating a decoder with this baud rate nothing happens.
Therefore, I'm reaching out for a little help. Would anyone happen to know anything about the CAT CDL network? Baud rate, voltages etc. I'm certain we can decode it but there is something missing from the limited information I have available. I have attached the PSDATA file as well with the data along with a Math channel. May not need the math channel to decode with as both channel A & B are fairly clean signals as the engine wasn't running!
Any help would be gratefully appreciated.
Kind regards
Ben
Hope all are well?
Am after a little support from those working with Caterpillar products.
I've come across it before in the past surrounding the CDL network present on Caterpillar machinery. Most of the work is usually on J1939 which is fine as we have the amazing J1939 decoder, thank you software and decoding teams at Pico!
My problem is I'm struggling to get anything to decode it. At first glance it appears we are dealing with CAN especially as the packet structure looks the same. However, when adding rulers in we have very different voltage levels.
Looking at the Baud rate, by using the time rulers on the smallest pulse in the message my frequency is around 62kHz (= 62kBaud).
However, creating a decoder with this baud rate nothing happens.
Therefore, I'm reaching out for a little help. Would anyone happen to know anything about the CAT CDL network? Baud rate, voltages etc. I'm certain we can decode it but there is something missing from the limited information I have available. I have attached the PSDATA file as well with the data along with a Math channel. May not need the math channel to decode with as both channel A & B are fairly clean signals as the engine wasn't running!
Any help would be gratefully appreciated.
Kind regards
Ben
- Attachments
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- CAT 962 H CAN DATA AT OBD PORT IN CAB D E CDL 1 buffer.psdata
- (12.58 MiB) Downloaded 390 times
Re: CAT Data Link (CDL)
Ben,
I work around quite a few cat machines, I could hook my 4425A to a 966G next week most likely. I just fixed a D11R CDL issue, can wires were shorting to ground, watching the wave form in real time was so much faster than hunting for a rub spot.
Ross Dugan
I work around quite a few cat machines, I could hook my 4425A to a 966G next week most likely. I just fixed a D11R CDL issue, can wires were shorting to ground, watching the wave form in real time was so much faster than hunting for a rub spot.
Ross Dugan
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ben.martins
- Pico Staff Member
- Posts: 557
- Joined: Tue May 16, 2017 1:02 pm
Re: CAT Data Link (CDL)
Hey Ross,
Great catch with the CDL issue and as you say being able to see the signal, especially with something like network, makes it little easier.
If you don't mind grabbing a capture for me that would be great. Would you have anything about this network you would be willing to share?
Thanks again.
Kind regards
Ben
Great catch with the CDL issue and as you say being able to see the signal, especially with something like network, makes it little easier.
If you don't mind grabbing a capture for me that would be great. Would you have anything about this network you would be willing to share?
Thanks again.
Kind regards
Ben
Re: CAT Data Link (CDL)
The repair on the D11 I had a short clip on video, in this one I was using my 2204A and not my 4425A, crawling around on large machines, sometimes I use the cheap scope if great accuracy and deep memory isn’t needed.