Can Protocol Interview Questions And Answers

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Top Can Protocol interview questions and answers for freshers and experienced

What is Can Protocol ?

Answer :

Questions : 1 :: What is CAN?

1. CAN is a multi-master broadcast serial bus standard for connecting electronic control unit (ECUs). 2. Controller–area network (CAN or CAN-bus) is a vehicle bus standard designed...View answers

Questions : 2 :: CAN frame works?

SOF – 1 Dominant Arbitration Field – 11 bit Identifier, 1 bit RTR (or) 11 bit, 1SRR, 1IDE, 18 bit, 1RTR Control Field – IDE, r0, 4 bits (DLC) Data Field – (0-8) Bytes CRC...View answers

Questions : 3 :: Why CAN is having 120 ohms at each end?


To minimize the reflection reference, to reduce noise. To ensure that reflection does not cause communication failure, the transmission line must be...View answers

Questions : 4 :: Why CAN is message oriented protocol?

CAN protocol is a message-based protocol, not an address based protocol. This means that messages are not transmitted from one node to another node based on addresses. Embedded in the CAN message...View answers

Questions : 5 :: How CAN will follow the Arbitration?

CSMA/CD + AMP (Arbitration on Message Priority) Two bus nodes have got a transmission request. The bus access method is CSMA/CD+AMP (Carrier Sense Multiple Access with Collision Detection and...View answers

Questions : 6 :: If master sends 764 and Slave sends 744 which will get the arbitration?


Starts from MSB, first nibble is same, Master sends 7, slaves also sends 7 the message with more dominant bits will gain the arbitration, lowest the message identifier higher the...View answers

Questions : 7 :: Standard CAN and Extended CAN difference?

Number of identifiers can be accommodated for standard frame are 2power11.  Number of identifiers more compare to base frame, for extended frame are 2power29. IDE bit – 1 for extended...View answers

Questions : 8 :: What is bit stuffing?

CAN uses a Non-Return-to-Zero protocol, NRZ-5, with bit stuffing. The idea behind bit stuffing is to provide a guaranteed edge on the signal so the receiver can resynchronize with the transmitter...View answers

Questions : 9 :: What is the use of bit stuffing?


Long NRZ messages cause problems in receivers • Clock drift means that if there are no edges, receivers lose track of bits • Periodic edges allow receiver to resynchronize to sender...View answers

Questions : 10 :: What are the functions of CAN transceiver?

The transceiver provides differential transmit capability to the bus and differential receive capability to the CAN controller. Transceiver provides an advanced interface between the protocol...View answers

Questions : 11 :: Functionality of Data link layer in CAN?

LLC (Logical Link Control) – Overload control, notification, Message filtering and Recovery management functions. MAC (Medium Access Control) - Encapsulation/ de-capsulation, error...View answers

Questions : 12 :: What is meant by Hard synchronization and soft synchronization?

Hard Synchronization to be performed at every edge from recessive-to-dominant edge during Bus Idle. Additionally, Hard Synchronization is required for each received SOF bit. An SOF bit can be...View answers
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