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CAN SNIFFER CANLAB s.r.o. http://www.canlab.cz CAN SNIFFER - Technical description - Contents: GENERAL DESCRIPTION 2 INSTALLATION 4 MOLEX CONNECTOR AND WIRE DESCRIPTION 5 Ing. David Spanl Mgr. Vнtzslav Rejda 1/5 Verze dokumentu 1.10 CAN SNIFFER CANLAB s.r.o. http://www.canlab.cz General description When connecting external devices to CAN bus in the car or other system, there is always risk of influencing the communication on the bus because of this device. E.g. elementary mistake as incorrectly set bus speed, if the device is not in Listen only mode, disturbs the communication on the bus, thus the car control units report error and the car can be out of order. Listen only mode eliminates this risk, however, the error in software of the connected device or error of device settings/configuration can cause that this mode is not active and communication can be disturbed, e.g. message can be generated at the CAN bus that could have unpredictable consequences ­ as extreme example. Other problem that can occur during connection directly to engine-CAN without using FMS gate or similar device approved by manufacturer of the car, is the electrical conductible connection with CAN bus. It violates guarantee conditions for the car and in case of accident, connected device could be considered to be the cause of the accident. On the other hand, connection directly to engine-CAN is in cars without FMS gate (with respect to the unavailability of the gate ­ cars; or its high price) the only possibility how to read real kilometers, fuel tank level and so on at reasonable expense. In case of modern cars, reading from the engine-CAN provides more data then FMS gate. CAN SNIFFER device allows data reading from CAN bus by means of tapping and signal reconstruction at the bus through its scanning from conductors through their insulation. CAN SNIFFER is not conductibly connected with the car bus, thus, the conductors are not disturbed, and communication at this bus cannot be influenced. CAN SNIFFER output is signal of CAN bus that can be connected to other device that has input of CAN bus, high speed type. Output CAN is of high speed type according to ISO 11898-2. Device works within the speed range of 83.3k ... 1Mbit. Scanned CAN can be of high speed type or low speed type. Device works with both variants of CAN. When using conductors of so called low speed CAN (11898-3 and ISO 11992-1), low speed CAN is transformed into high speed CAN a