The termination resistor for the CAN bus is generally 120 ohms. In fact, during design, it consists of two 60 ohm resistors connected in series. There are typically two nodes of 120Ω on the bus, which is a well-known fact for anyone with a basic understanding of the CAN bus. However, as someone who struggles … Read more
1. Foundation Fieldbus (FF) This was established in September 1994 by the collaboration of American Fisher-Rousemount, Yokogawa, ABB, Siemens, Invensys, and over 80 other companies to create the ISP protocol, along with Honeywell and over 150 companies in Europe to create the WorldFIP protocol. This bus has been widely used in the field of process … Read more
In the development of industry, fieldbus plays a very important role, mainly applied in fields such as petroleum, chemical, electric power, medicine, metallurgy, manufacturing, transportation, national defense, aerospace, agriculture, and buildings. Today, I will introduce several types of fieldbus such as the Modbus communication protocol, PROFIBUS, FF, and CAN bus. Origin and Development of Modbus … Read more
Introduction to In-Vehicle Networks As the complexity of electronic control systems increases, and the demand for communication capabilities among the electronic control units (ECUs) within vehicles grows, the use of point-to-point connections leads to an increase in wiring harnesses inside the vehicle. This creates significant challenges for reliability, safety, and quality in automotive design and … Read more
Have you heard of the LIN bus? It is often seen in automotive bus design. You might ask, “Isn’t there already a CAN bus? Where does the LIN bus come from?” The reason is simple: the CAN bus is too expensive. If an entire vehicle were to use the CAN bus, the costs would be … Read more
With the booming development of automotive electronics and industrial automation, the number of devices and data volume on the CAN bus has greatly increased, posing significant challenges to the CAN bus. To meet the higher bandwidth and data throughput requirements, CAN FD (CAN with Flexible Data-Rate) was born. So what exactly are the differences between … Read more
First, let’s take a look at the frame structure of CAN: CAN Frame Structure From the above image, we can see that in the standard frame, there is an r0 bit, which is actually a reserved bit. ISO11898-1 stipulates that the sender sends the r0 bit as dominant, while the receiver does not judge the … Read more
Modal Verbs Usage of Can and Could 1. Indicates ability or objective possibility, and can also express requests and permission. Can you finish this work tonight? Man cannot live without air. — Can I go now? — Yes, you can. Note: Could can also express requests, with a more polite tone, mainly used in questions, … Read more
As people’s demands for automotive safety, comfort, exhaust emissions, and fuel economy become increasingly stringent, the amount of information exchanged between control units is growing, and the number of sensors and wires is rapidly increasing, making it more difficult to troubleshoot and repair. To ensure that the electronic systems in vehicles remain operational without taking … Read more
CAN Protocol Message 1. Types of Frames Communication is conducted through the following 5 types of frames. ● Data Frame ● Remote Frame ● Error Frame ● Overload Frame ● Frame Interval In addition, the data frame and remote frame have both standard and extended formats. The standard format has11 bits identifier (Identifier: hereinafter referred … Read more