https://forge.codesys.com/forge/talk/Engineering/thread/eabd01a1b7/2022-02-14T21:32:13.520000ZRecent posts to CAN API Listen Only mode - Do not send any acknowledge to any CAN messages2022-02-14T21:32:13.520000Z2022-02-14T21:32:13.520000Zcolehttps://forge.codesys.com/u/cole/https://forge.codesys.comb23b1b5715189a827fef32e200f51c500f46d8a2

<div class="markdown_content"><p>I am using CAN API and trying to use a true listen only mode, where the CODESYS device doesn't even send acknowledge to received messages. CAN sniffers like PeakCAN have this mode. I have tried using only the CAN.CANBus_29bit function block, I have also tried only using the CL2.DriverOpenH function, without any transmit or receive function blocks at all. If I use an incorrect baud rate the CODESYS device will cause error frames (seen by Kvaser CANKing or PeakCAN). I need to have complete listen only / analyzer mode so I can connect at any baud rate, not send any ACK / packets at all, if I do not see any messages, than I will close the Driver and open again at a different baud rate.<br/> Any help would be greatly appreciated!</p></div>