The cable itself does not need to be 120 Ohms; it is the resistor across CAN High to Low at the end.
Rob Kado Manager & Sr Technical Specialist Electromagnetic Compatibility Chrysler 800 Chrysler Drive CIMS 481-47-20 Auburn Hills, MI 48326 Desk: (248) 576-6915 Mobile: (248) 467-0639 Fax: (248) 576-7045 From: [email protected] [mailto:[email protected]] On Behalf Of McInturff, Gary Sent: Tuesday, January 24, 2012 1:16 PM To: '[email protected]' Subject: 120 ohm CAN cable Can bus requires a 120 termination, and I have a client that is trying to do it with the bare cable, and I don't know that such cable exists unless custom built. I'm aware of impedance controlled coax but this is just your standard hookup cable in an appropriate jacket. We terminate the line at each end but don't control the cable itself. Yes there will be reflections but as I understand it the CAN standard identifies the termination requirements but doesn't identify a specific 120 ohm cable between the terminating resistors. Comments please? Gary McInturff Reliability/Compliance Engineer Esterline Interface Technologies Featuring ADVANCED INPUT, MEMTRON, and LRE MEDICAL products 600 W. Wilbur Avenue Coeur d'Alene, ID 83815-9496 Office:208-635-8306 Cell: 509 868 2279 Toll Free: 800-444-5923 X 1238 [email protected]<mailto:[email protected]> www.esterline.com/interfacetechnologies<http://www.esterline.com/advancedinput> Technology, Innovation, Performance... - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]<mailto:[email protected]>> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]<mailto:[email protected]>> Mike Cantwell <[email protected]<mailto:[email protected]>> For policy questions, send mail to: Jim Bacher <[email protected]<mailto:[email protected]>> David Heald <[email protected]<mailto:[email protected]>> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
