What is the difference between can bus and 485 bus?

The difference between can bus and 485 bus: 1. Communication method, CAN uses multi-node communication, and 485 uses a single node to control multiple slave nodes; 2. Communication speed, CAN data transmission speed is higher than 485; 3 , Distance limitation, CAN communication distance is between 40-500 meters, 485 can reach 1200 meters; 4. Data transmission reliability, CAN has higher data transmission reliability than 485; 5. CAN adopts a non-centralized network structure , 485 adopts star topology; 6. Cost, CAN equipment and wiring costs are higher than 485.

#The operating environment of this article: Windows 10 system, dell g3 computer.

CAN bus and 485 bus are two communication bus protocols commonly used in the industry. They have different characteristics and scope of application in practical applications. This article will compare the CAN bus and the 485 bus from multiple angles so that readers can better understand their differences.

1. Communication method

The CAN bus adopts a multi-host communication method, that is, all nodes can send and receive data at the same time, and the communication speed is fast. The 485 bus is a single-host communication method. Only one node can send data, and other nodes can only receive data. Therefore, the CAN bus is suitable for scenarios where multiple nodes communicate simultaneously, while the 485 bus is suitable for scenarios where a single node controls multiple slave nodes.

2. Communication speed

CAN bus supports high-speed data transmission, and the communication speed can reach 1 Mbps. The transmission rate of the 485 bus is relatively low, generally communicating at a maximum of 10 Mbps. Therefore, in applications requiring high-speed transmission, the CAN bus has more advantages.

3. Distance limitation

The communication distance of CAN bus is generally between 40-500 meters, and the range can be expanded by using repeaters. The communication distance supported by the 485 bus is relatively long, generally up to 1200 meters. Therefore, for applications requiring long-distance communication, the 485 bus is more suitable.

4. Data transmission reliability

CAN bus has higher data transmission reliability. It uses differential signal transmission, has good anti-interference ability against electromagnetic interference, and can communicate normally in noisy environments. The 485 bus uses a single signal transmission, has weak interference resistance and is more sensitive to environmental interference. Therefore, in industrial environments, CAN bus is more suitable for scenarios that have higher requirements for communication reliability.

5. Network topology

CAN bus is suitable for multi-host and distributed network applications, and can achieve a non-centralized network structure. The 485 bus generally adopts a star topology. All devices are connected to the main control terminal through the bus, and the communication between nodes needs to be scheduled by the main control terminal. Therefore, CAN bus is more suitable in applications that require distributed management.

6. Cost

From a cost perspective, the cost of hardware equipment and wiring materials for the 485 bus is relatively low and is suitable for simpler communication applications. In comparison, the equipment and wiring costs of CAN bus are relatively high, making it suitable for industrial applications that have higher requirements for communication quality.

Summary

CAN bus and 485 bus have different characteristics in terms of communication methods, communication speed, distance limitations, data transmission reliability, network topology and cost. and scope of application. In actual applications, selections need to be made based on specific application requirements, and comparative evaluations must be conducted as needed to determine the most suitable communication bus protocol.

The above is the detailed content of What is the difference between can bus and 485 bus?. For more information, please follow other related articles on the PHP Chinese website!