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120 Ohm terminating resistor for CAN bus systems
120 Ohm terminating resistor for CAN bus systems
Termination Resister in CAN network
High-Speed CAN Termination resistor
Low-Speed CAN Termination resistor
Fault-Tolerant CAN Termination resistor
Terminate a high-speed CAN (Controller Area Network) bus with the CAN Terminator.
This CAN bus termination resistor (120 Ohm) consists of a 9-pin D-Sub connector (male), a 9-pin D-Sub socket (female).
All CAN networks need two terminators; one at each end of the network.
The CAN Terminator can be used where the CAN cable or CAN node at the end does not have internal termination.
How to detect the resistance value of the terminal resistor on the CAN bus ?
Controller Area Network, or CAN for short, was developed by BOSCH, a German company known for its R&D and production of automotive electronic products, and eventually became an international standard (ISO 11898).
CAN belongs to the category of field bus, which is a serial communication network that effectively supports distributed control or real-time control. Compared with many RS-485 distributed control systems based on R line, the distributed control system based on CAN bus has obvious advantages in the following aspects:
1. Strong real-time data communication between nodes in the network
First of all, the CAN controller works in a variety of ways. Each node in the network can compete to send data to the bus by means of bit-by-bit arbitration in a lossless structure according to the bus access priority (depending on the message identifier), and the CAN protocol is abolished.
Instead of encoding the station address, the communication data is encoded, which enables different nodes to receive the same data at the same time. These characteristics make the data communication between the nodes of the CAN bus network strong in real-time and easy to construct.
Redundant structure improves system reliability and system flexibility. However, using RS-485 can only form a master-slave structure system, and the communication method can only be carried out by the way of polling of the master station, and the real-time performance and reliability of the system are poor;
2. Short development cycle
The CAN bus is connected to the physical bus through the two output terminals CANH and CANL of the CAN transceiver interface chip 82C250, and the state of the CANH terminal can only be a high level or a floating state, and the CANL terminal can only be a low level or a floating state. This ensures that there will be no phenomenon in the RS-485 network, that is, when there is an error in the system and multiple nodes send data to the bus at the same time, the bus will be short-circuited, thereby damaging some nodes. Moreover, the CAN node has the function of automatically turning off the output in the case of serious errors, so that the operation of other nodes on the bus is not affected, so as to ensure that there will be no problems in the network. state.
Moreover, the perfect communication protocol of CAN can be realized by the CAN controller chip and its interface chip, which greatly reduces the difficulty of system development and shortens the development cycle, which is incomparable with RS-485, which only has electrical protocols.
3. Fieldbus that has formed an international standard
Compared with other field buses, CAN bus is a field bus that has formed an international standard with the characteristics of high communication rate, easy implementation, and high cost performance. These are also important reasons why CAN bus is used in many fields and has strong market competitiveness.
CAN stands for Controller Area Network, which belongs to the category of industrial field bus. Compared with the general communication bus, the data communication of CAN bus has outstanding reliability, real-time and flexibility. Because of its good performance and unique design, CAN bus has been paid more and more attention by people.
Its application in the automotive field is the most extensive, and some well-known automotive manufacturers in the world have adopted CAN bus to realize the data communication between the automotive internal control system and various detection and execution agencies.
At the same time, due to the characteristics of CAN bus itself, its application scope is no longer limited to the automotive industry, but also to automatic control, aerospace, navigation, process industry, machinery industry, textile machinery, agricultural machinery, robots, CNC machine tools, medical equipment and sensor and other fields.
CAN has formed an international standard and has been recognized as one of the several most promising fieldbuses. Its typical application protocols are: SAE J1939/ISO11783, CANOpen, CANaerospace, DeviceNet, NMEA 2000, etc.