CAN Protocol Interview Questions. The Top asked CAN interview questions. The CAN Protocol interview questions are the questions in all the automotive companies all over the world. If you are an automotive engineer or any other engineer in Automotive domain, you should know the details of CAN. Going to an interview without CAN knowledge is like going to your marriage without your dress. So, lets check the article.
CAN Protocol | Top 50 Question & Answers in CAN Protocol | Embedded World
CAN use 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 before minor clock discrepancies between the two nodes can cause a problem. With NRZ-5 the transmitter transmits at most five consecutive bits with the same value. After five bits with the same value (zero or one), the transmitter inserts a stuff bit with the opposite state.
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Some parts of the CAN message have a fixed format, i.e. the standard defines exactly what levels must occur and when. (Those parts are the CRC Delimiter, ACK Delimiter, End of Frame, and also the Intermission, but there is some extra special error checking rules for that.) If a CAN controller detects an invalid value in one of these fixed fields, a Form Error is signaled.
Hard Synchronization to be performed at every edge from the recessive-to-dominant edge during Bus Idle. Additionally, Hard Synchronization is required for each received SOF bit. A SOF bit can be received both during Bus Idle and also during Suspend Transmission and at the end of Interframe Space. Any node disables Hard Synchronization if it samples an edge from recessive to dominant or if it starts to send the dominant SOF bit.
CSMA stands for Carrier Sense Multiple Access. This concept is used in transmission media access. If multiple ECUs are connected and sharing the same transmission medium to transfer its data. So if they (multiple nodes) start transmission at the same time, then there is the possibility of collision and data corruption.CSMA introduce two concepts CSMA/CA and CSMA/CD to avoid this situation (collision and data corruption).
Why is job preparation easier with our interview questions site? Preparing for a Controller Area Network (CAN bus) job is now more easy and simple with our interview questions better on wisdom jobs? Because wisdomjobs give you all information plus all the jobs in one place. To be more precise about Controller Area network A Controller Area Network (CAN bus) is a robust vehicle bus standard designed to allow microcontrollers and devices to communicate with each other in applications without a host computer. If you are good at all concepts on controller Area Network then there are various leading companies that offer you various job positions like Network Controller/Operator Lead, Technical Consultant, Wireless & Mobility, Network Administrator and many other job roles also.
Originally Bosch released CAN specification CAN 2.0 for passenger Vehicles which explains 11- bit identifier frame architecture but later on it divided into CAN 2.0(A) which is named as standard CAN be used in passenger cars dealing with 11-bit Identifier while other is CAN2.0(B) which is known as extended CAN be used in heavy vehicles like Buses and Trucks it deals with 29-bit Identifier. So the basic difference in both standard at message Identifier field. For detail, frame architecture, Go through this article.
CAN Stands for Controller Area Network patented by Robert Bosch in 1986 to replace conventional wiring used between ECUs for data sharing between ECUs in vehicle.
CSMA stands for Carrier Sense multiple Access.This concept is use in transmission media access.if multiple ECUs are connected on sharing same transmission medium to transfer its data then there is possibility of collision and data corruption if multiple nodes start transmission same time.CSMA introduce two concept CSMA/CA and CSMA/CD to avoid this situation.
Apart from these, CAN protocol have other powerful features. It offers the in-built features in CAN controller like synchronization of nodes, Frame Integrity check through CRC mechanism etc. because of all these features offered at h/w level, lots of software coding overhead reduced. for detail about features list please go through this article
CAN protocol allows only 8-byte data in CAN Frame. More than 8-byte data will be fragmented in the 8-byte frame as per 15765-2 standard at the transport layer. For more detail go through this article.
When a node sends out a message but does not receive an acknowledgement from another node, it will automatically resend the message up to a certain number of times. If the message still does not receive an acknowledgement after that point, the node will assume that the message was not received and will take appropriate action.
Arbitration is the process of determining which node on a CAN bus has priority to transmit data at any given time. This is important because all nodes on the bus have equal priority, so if two nodes try to transmit at the same time, a collision will occur. To avoid this, each node monitors the bus to see if any other nodes are transmitting. If the bus is clear, the node can transmit. If another node is already transmitting, the node will wait until the bus is clear before transmitting.
CAN bus is a popular communications protocol for automotive applications. When applying for a position in automotive engineering or development, it is likely that employers will expect you to have a strong understanding and familiarity with CAN bus. Understanding what CAN bus questions you are most likely to encounter and how to properly answer them improves your chances of making a positive impression on the hiring manager. In this article, we discuss the most commonly asked CAN bus questions and how you should respond.
There are a few potential limitations when using CAN buses. One is that the bus may become overloaded if too much data is being sent at once. Another is that the bus may be susceptible to electromagnetic interference, which can cause data corruption. Finally, the bus may be subject to physical damage if it is not properly protected.
The dominant state is when the voltage on the CAN bus is high, and the recessive state is when the voltage on the CAN bus is low. A node is only able to transmit when it is in the dominant state, and it will only be able to receive when it is in the recessive state.
FAQ
What is CAN protocol and how it works?
What is the basic principle of CAN protocol?
CAN TP protocol interview questions?
- 1) What is CAN Protocol? …
- 2) Enlist major features of CAN Protocol? …
- 3) List some applications of CAN Bus? …
- 4) What are CAN Messages? …
- 5) Explain high Speed CAN and Low Speed CAN? …
- 6) What is standard CAN and Extended CAN? …
- 7) What Is Can Arbitration? …
- 8) What is SAE J1939?
