Communication between two PCAN-USB adapters

[plucia1]

Hello,

We have run into an issue while testing the communication between two PCAN-USB adapters.

Here are the FW/ Driver versions as detected by PCAN-View:
Firmware Version: 8.4
Driver Version: 4.2.0
Number of channels: 1

Using a bitrate of 250k, we’ve tested communication between two PCAN-USBs with both PCAN-View in windows and SocketCAN in linux (w/ cansend, candump). On the sender side, there is no indication that the frames cannot be sent, and on the receive side we don’t receive any frames in both of our test configurations. While running PCAN-View on the receive side, we observe that there is a BUSHEAVY status, but the status shows as OK on the send side.

PEAK.png (28.67 KiB) Viewed 5646 times

The CAN adapters are connected to each other by a single DB-9 female to female serial cable. We have tried testing with two different brands of serial cables. Are these CAN adapters known to be working together in this kind of setup? We are using this test setup to validate that the CAN Analyzers will be able to reliably transmit frames between one another without risk of frame dropping or swapping.

If you can advise on the expected performance in the scenarios described above, it would be helpful for us to know. Additionally are there any limitations we should be aware of when testing directly between two PCAN-USB’s adapters?

[PEAK-Support]

Looks like you have not used any terminations in you physical setup ( BUSHEAVY ) - Simply connect CAN-H to CAN-H and CAN-L to CAN-L , add a 120 Ohm Termination on each end - thats ist - will work - tested 1000times...

[plucia1]

Do you mean add a 120 Ohm resistor between CAN-H and CAN-L?

120_Ohm.png (30.52 KiB) Viewed 5628 times

Would we need one of the following adapter then?
https://www.peak-system.com/PCAN-Term.270.0.html?&L=1

So instead of the following setup:

Setup1.png (4.03 KiB) Viewed 5628 times

We should do this?

Setup2.png (5.42 KiB) Viewed 5628 times

[M.Heidemann]

Hello,

As my colleague Uwe wrote:

You need a 120 Ohm resistor on both ends of the bus, so you need an additional termination adaptor.

You graphic only shows one adaptor, which would be an underterminated bus.


If you do this your setup should look like this:

correction.png (21.91 KiB) Viewed 5619 times

You can use 2x IPEK-003002 or 2x IPEK-003002-Mini adaptors in this case:

https://www.peak-system.com/PCAN-Term.270.0.html?&L=1



For further questions feel free to contact me.


Best Regards

Marvin

[plucia1]

Marvin,

Thank you. We have ordered the adapters.

Best Regards,
Peter