PEAK-System Forum

I have saved the following trace from PCAN-View:

;$FILEVERSION=2.0
;$STARTTIME=43944.426755081
;$COLUMNS=N,O,T,I,d,l,D
;
;   D:\PRJ\BasicSw\XCP\tmp\200421\CfgDAQ while Running ERR_SEQUENCE.trc
;   Start time: 23.4.2020 10:14:31.639.0
;   Generated by PCAN-View v4.2.4.564
;-------------------------------------------------------------------------------
;   Connection                 Bit rate
;   PCANLight_USB_16@pcan_usb  250 kBit/s
;-------------------------------------------------------------------------------
;   Message   Time    Type ID     Rx/Tx
;   Number    Offset  |    [hex]  |  Data Length
;   |         [ms]    |    |      |  |  Data [hex] ...
;   |         |       |    |      |  |  |
;---+-- ------+------ +- --+----- +- +- +- +- -- -- -- -- -- -- --
.....
   6155     22455.965 DT 00000200 Rx 8  06 22 22 05 02 02 02 02 
   6156     22456.325 DT 00000200 Rx 2  FD 06 
   6157     22456.874 DT 00000002 Rx 8  77 01 BC 37 4B 44 22 22 
   6158     22458.178 DT 00000100 Rx 8  EF 20 13 14 15 16 17 18  -------<-- MESSAGE 1
   6159     22457.270 DT 00000200 Rx 3  FE 29 20  ----------------------<-- MESSAGE 2
   6160     22457.798 DT 00000200 Rx 7  02 BC 37 4B 44 02 02 
   6161     22458.158 DT 00000200 Rx 2  FD 06 
   6162     22458.710 DT 00000002 Rx 8  96 01 BD 37 4B 44 22 22

Please, notice that the MESSAGE 1 that is written before MESSAGE 2 has higher time offset.

Can anybody explain why?
Which message was earlier on CAN bus? MESSAGE 1 (because it was written first) or MESSAGE 2 (because it has smaller time offset)?

Details of my configuration:
PCAN-USB FD device, Windows 7, PCAN-View v4.2.4.564
There is a C# application (running on the same PC as PCAN-View) accessing PCAN-USB FD via PCAN-Basic API. This application transmit messages with ID 00000100 (MESSAGE 1).
All other messages (MESSAGE 2,...) are transmitted by other HW device (microcontroller).

Thanks.
Libor Waszniowski

Hello,

Thank you for your request.

This behaviour is due to the internal connection of PCAN-View to the driver interface.

It will cause the transmitted messages or your PCANBasic application to be logged instantly, before they are sent on the real CAN-bus.

External devices will not be affected by this, you could test this by generating a trace from another PCAN-USB interface on your CAN-bus.

Best Regards

Marvin

Thanks for your fast reply.
So in my case, message MESSAGE 2 was earlier on CAN bus because it has smaller time offset.

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