you would like to transmit addional information using the 4th bit of DLC.
Indeed. Since CANopen SDOs always use the entire 8 bytes of payload, the lowest 3 bit of the DLC are wasted in such communication. So I'm trying to use them for some data encoding.
Hi,
I got that the maximum transmissible payload is hardlimited to 8 byte. But still, I want to set the DLC to a value greater than 8. Of course, doing so won't extend the MTU, and I don't expect it to do so.
All I'm looking for is to set the DLC to a kind of 'invalid' value of e.g. 10 and transmit only 8 byte of data.
Nevertheless, I currently found that CanPort.Write(string tosend) accepts arbitrary DLC values without error and truly sets the bits on the line like given.
If you know another method which spares the conversion from binary to ascii, please let me know.
Best Regards
Hi,
I know it seems a bit odd but I'm trying to send a frame over CAN with the DLC being set to a value greater than 8.
(I still expect the driver to only transmit 8 bytes.)
As stated in your CAN driver documentation (Version 2.06, 2015-03-23), such values will silently be sent (despite actually transmitting only 8 bytes of payload).
Now my problem is that your .NET API implementation does not accept any DLC parameter greater than 8 and does not transmit any frames on invocation. I.e. an errorcode/exception occurs.
Can you think of a workaround that allows me to use your API and still send frames with DLC > 8 ?
Maybe WriteRegister()/WriteRegisterRM() could do the trick ?
I'm using an EFUSA9 w\ WinEC2013.
Thanks & Best Regards
Philipp
Could you provide some information on how to proceed with replacing the old driver ? Apparently, the driver is preloaded within the kernel.
Just placing the dll in FFSDISK and adapting the registry driver file path for CAN interfaces didn't work for me.
I've seen that Kernel V2.70 was released on 2019-11-12 but can't find a downloadable version.
V270_191004_BETA unfortunately didn't resolve the issue with RTR frames.
Where/when can I download the released V2.70 ?
Best Regards
Philipp
If urgend I can provide you the driver here for download.
Which OS you are using - WEC7 or WEC2013
That'd be awesome ! I'm using WEC2013.
Hi everyone,
I'm currently struggling with receiving CAN frames in which the RTR bit is set to 1 using the CANPort.dll (v1.0.2897.27253).
I connected two EFUSA9 via CAN and transmit frames from one to the other using the WriteTransmitData() function. (rtr parameter is hardcoded to 1)
The other EFUS repeatedly reads events by means of the ReadEventData() function, but never receives a CanEventFlags.RECEIVED event.
When setting the rtr parameter to 0, all frames are correctly received and the event is properly read!
Do I have to adjust some kind of special setting to be able to receive RTR frames ? I couldn't find dedicated information in the documentation.
Some of the settings I use:
CanPort.CanEventFlags.CANBUS_ALL
CanPort.CanMode.BASICAN
CanPort.CanAcceptanceFilter.code = 0
CanPort.CanAcceptanceFilter.mask = 0xFFFFFFFF
CanPort.CanTransmitFormat.STANDARD
Thanks in advance & best regards
Philipp
