FAQ about CAN


For CAN new user		where can I found a general description about CAN? Please read "CAN introduction about" from our WEB-side (ca. 12 sides). If you want, print it out, it was a nice information platform for general CAN-knowledge. I use a CAN network with more than 100 kbit/s baud rate and no connection is possible with other members on the net, what is wrong? At baud rates more than 100 kbit/s it is necessarry to protect at minimum one side of the physical bus with a resistor from 120 Ohm against reflections. I start one application, go BusON and transmit one or more messages, in every cases I get a fifo overrun, what shall I do? 1.) Have all used can nodes the same bus-speed? 2.) If you use CAN it is necessary to connect at minimum one other node to the net, the CAN-chip need this partner otherwise no acknowledge bit was set on the bus. 3.) Are you use 29bit IDs? If "YES" make sure that all can-chips support the can 2.0 B standard. What is the different of bCAN, eCAN, fCAN or sCAN? -BCAN Basic-CAN The used chip has only a small buffer structure. All filter has to be defined in software and have to managed by the application. -ECAN Extended-CAN The used chip supports extended identifiers and supports in most cases FCAN and BCAN structure. ( CAN 2.0B / 29bit IDs) -FCAN Full-CAN The used chip has an internal buffer structure with mailbox architecture and supports Remote Frames. -SCAN Standard-CAN The used chip supports standard identifiers. ( CAN 2.0A / 11bit IDs) Note: CAN 2.0B passive chips tolerate 29bit IDs without producing an error, but no use of those frames is possible with such a chip-type.

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