http://can-wiki.info/ 2026-04-17T06:22:43+00:00 http://can-wiki.info/ http://can-wiki.info/lib/exe/fetch.php?media=wiki:dokuwiki.svg text/html 2018-08-21T21:08:50+00:00 Anonymous (anonymous@undisclosed.example.com) http://can-wiki.info/doku.php?id=can_faq:can_auto_baud&rev=1534885730&do=diff CAN auto bit rate detection The Infineon application note AP292501 describes the problem and two commonly used methods to solve this problem. On the ICC 2003 Uwe Koppe (MicroControl) presented: Automatic bit-rate detection in CANopen networks. The CiA has published an application note based on the Koppe paper: text/html 2020-07-25T10:36:51+00:00 Anonymous (anonymous@undisclosed.example.com) http://can-wiki.info/doku.php?id=can_faq:can_bitrates&rev=1595673411&do=diff What are commonly used bit rates? The following is only valid for classical CAN or may be the arbitration bit rate of CAN FD. CAN FD has a second, the data bit rate. The most used industrial CAN protocols are using: * DeviceNet: 500, 250, 125 kbit/s text/html 2018-08-21T21:08:51+00:00 Anonymous (anonymous@undisclosed.example.com) http://can-wiki.info/doku.php?id=can_faq:can_bus_off&rev=1534885731&do=diff CAN Bus-Off condition/ state BusOff is an error state of the CAN Controller. Only the transmitter can switch in the state BusOff, if the Transmit Error Counter exceeds 255. (more details needed on this place) In real life a CAN controller can switch in the mode ErrorPassive sporadic. But the mode BusOff is a critical error and should never arrive without a hardware error or an other critical error. text/html 2018-08-21T21:08:51+00:00 Anonymous (anonymous@undisclosed.example.com) http://can-wiki.info/doku.php?id=can_faq:can_cabling&rev=1534885731&do=diff CAN cabling Some rules on how to design a CAN network. Consider reading Problem Solving Questions. The rules are general and valid for an CAN network including CANopen and Devicenet. Therefore look at Device Net Cable too. * Always use twisted pairs for CAN_H and CAN_L. * Several manufacturers offer also four twisted cables for CAN when using 4-wire construction. This makes cable thinner and enables moulding of 2x2x0.5mm2 into e.g. M12-connectors text/html 2018-08-21T21:08:51+00:00 Anonymous (anonymous@undisclosed.example.com) http://can-wiki.info/doku.php?id=can_faq:can_connectors&rev=1534885731&do=diff CAN Connectors CiA Standard CiA303-1 lists more than 20 different connectors and their pinning. * Dsub-9 most often used male and female connectors * em069A-3, this 3-pin connector from China is dedicated to low-cost devices for cheap equipment. text/html 2018-08-21T21:08:51+00:00 Anonymous (anonymous@undisclosed.example.com) http://can-wiki.info/doku.php?id=can_faq:can_faq_basic_full&rev=1534885731&do=diff Difference between Basic and Full CAN Initially there was only one “CAN controller”, which was designed to have some amount of object buffers. This was the now deceased Intel 82526 (up to 5 message buffers). It was followed by the 82527 with 15 message buffers. Then Philips tried to cut cost to produce a even cheaper version, hence 82C200 which has two receive buffers and one transmit buffer, and of course the partial mask-match filtering as well. In order to differentiate between these two CAN… text/html 2018-08-21T21:08:51+00:00 Anonymous (anonymous@undisclosed.example.com) http://can-wiki.info/doku.php?id=can_faq:can_faq_blowuprs232&rev=1534885731&do=diff Can CAN blow up RS232 transceivers Christian Schlegel wrote Yes it can! Perhaps the CAN trasceiver 82C250 is used on the I/O module. This transceiver is only able to sustain a voltage of -8V to +18V at CAN_H and CAN_L. On a RS232 you have -12V to +12V. Using the CAN transceiver 82C251 gives more immunity because this transceiver can sustain a voltage of -36V to +36V at CAN_H and CAN_L and the price of this chip is quite the same as for the 82C250. text/html 2018-08-21T21:08:51+00:00 Anonymous (anonymous@undisclosed.example.com) http://can-wiki.info/doku.php?id=can_faq:can_faq_erors&rev=1534885731&do=diff CAN Errors / CAN Error States What are Error Active, Error Passive, and Bus off of CAN Bus? Just to give a little background to the answer: In order to prevent malfunctioning nodes from disturbing, or even blocking, an entire system, the CAN protocol implements a sophisticated fault confinement mechanism. The CAN protocol is intended to be orthogonal, i.e. all nodes address faults in the same manner. Fault confinement is provided where each node constantly monitors its performance with regard… text/html 2018-08-21T21:08:52+00:00 Anonymous (anonymous@undisclosed.example.com) http://can-wiki.info/doku.php?id=can_faq:can_faqlinks&rev=1534885732&do=diff CAN FAQs (and answers) in the net There are not only the FAQ list on this web site but a lot more spread all over the net. If you find one, and it is worth, put a link here or drop the admin a note. * CAN FAQ at the university of Warwick UK (old) * text/html 2018-08-21T21:08:52+00:00 Anonymous (anonymous@undisclosed.example.com) http://can-wiki.info/doku.php?id=can_faq:can_fd&rev=1534885732&do=diff CAN with flexible Data Rate improved CAN More than 20 years after introducing CAN, communication requirements have increased and CAN has reached it's bandwidth limits in some application fields. To improve CAN regarding bandwidth Bosch has specified the text/html 2021-09-18T08:53:47+00:00 Anonymous (anonymous@undisclosed.example.com) http://can-wiki.info/doku.php?id=can_faq:can_hg&rev=1631955227&do=diff CAN HG CAN-HG is an extension to CAN to meet the requirements of the modern car industry, developed by Automotive Labs. CAN with Higher speed data and provides bus Guarding support to stop spoofing and denial-of-service attacks. 2020-12-14 CAN-HG overview.pdf “CAN-HG overview of Augmenting Classic CAN for Performance and Security” version 04 text/html 2018-08-21T21:08:52+00:00 Anonymous (anonymous@undisclosed.example.com) http://can-wiki.info/doku.php?id=can_faq:can_message_filtering&rev=1534885732&do=diff What is CAN Message Filtering The two most common terms used are accceptance mask and acceptance code. Let's see how Allen Pothoof <apothoof@hotmail.com> explains this: In an ideal world, you would have a filter for each message you wanted to receive. That would allow you to reject any messages you aren't interested in. But we don't live in a perfect world. If you don't have enough filters, you have to text/html 2020-02-28T09:06:52+00:00 Anonymous (anonymous@undisclosed.example.com) http://can-wiki.info/doku.php?id=can_faq:can_xl&rev=1582880812&do=diff CAN XL CAN XL is developed beginning 2018 to improve CAN FD further by the CiA CAN XL Special Interest Group Up to now, there are three working draft documents available: * CiA 610-1 CAN XL – Specifications and test plans – Part 1: Protocol and signal specification * CiA 610-3 CAN XL - Specifications and test plans - Part 3: Physical media attachment sub-layer requirements text/html 2020-02-20T16:55:35+00:00 Anonymous (anonymous@undisclosed.example.com) http://can-wiki.info/doku.php?id=can_faq:main&rev=1582217735&do=diff CAN Frequently Asked Questions This CAN_FaqLinks page contains a collection of other FAQs on the web. * What is CAN? * try to answer it here or see <http://www.can-cia.org/can-knowledge/> * What is the future of CAN ? * CAN with flexible data rate - CAN FD - was introduced by Bosch in March 2012 on the 13th international CAN Conference text/html 2018-08-21T21:08:52+00:00 Anonymous (anonymous@undisclosed.example.com) http://can-wiki.info/doku.php?id=can_faq:problem_solving_questions&rev=1534885732&do=diff Problem Solving Questions Why is my CAN not working ? Here are some Problem Solving Questions This page should help you to find out why your network is not working by providing questions. Answering these questions should help to find out what is possibly going wrong. text/html 2018-08-21T21:08:52+00:00 Anonymous (anonymous@undisclosed.example.com) http://can-wiki.info/doku.php?id=can_faq:who_is_who&rev=1534885732&do=diff Who is Who in CAN Who is Who ? Fortunately not all the important persons are presented by pictures, but only by papers. Here are some. Feel free to add if you know someone. Ask for permission before posting or use public available portrait pictures.