CANbus – the key to reliable and efficient data transmission in multi-node networks!

A Closer Look at CANbus Technology
CANbus (Controller Area Network) is a multiplexed wiring system typically used to connect intelligent devices, such as automotive ECUs (Electronic Control Units), enabling low-cost and highly reliable data transmission. Originally designed as a serial data control network for ECUs, it was primarily geared towards automotive applications. However, CANbus has since discovered new applications and become one of the most prevalent fieldbuses in industrial automation.

The CAN protocol effectively supports distributed real-time control systems, boasts high data integration capabilities, and achieves communication rates up to 1 Mbps. A maximum of 110 nodes can be connected in the network. Furthermore, the CANbus network can be extended to a communication distance of up to 10 km.

CANbus also provides extensive error handling mechanisms to achieve high data integrity. For example, the CAN controller hardware can handle some data transmitter and hardware-related errors, which helps protect the CANbus network from electromagnetic interference.

The CAN protocol does not define physical addresses for each node; instead, it sends an identifier that can be recognized by different network nodes. Furthermore, information of different priorities is transmitted on the multi-master serial bus according to an arbitration protocol.

All of the above-mentioned functions of CANbus can greatly improve network reliability and data transmission efficiency.

RS-485 vs CANbus
In the field of industrial automation, various types of serial fieldbus communication methods may be used, including RS-232, RS-422, RS-485, and CANbus. However, only CANbus can be comparable to RS-485 in achieving long-distance, high-bandwidth communication.
Although both buses use the conventional two-wire pair transmission medium, they are completely different in many aspects, including transmission quality, transmission distance, and implementation cost.

The main performance differences are as follows:

characteristic	RS485	CANBUS
bus utilization	lower	higher
Network characteristics	Single host node	Multiple host nodes, regardless of primary or secondary
Transmission rate	Lower (30 scds/screen)	High (3 scds/screen)
Fault tolerance mechanism	N/A	Reliable error handling and error monitoring mechanisms
Transmission error rate	higher	Extremely low
Node error impact	The entire network was paralyzed.	No effect at all
Transmission distance	<1.5km	Maximum range 10km (5kbps)
Online error checking	Very difficult	Simple
Development difficulty	Simple	Requires a lot of professional knowledge
Maintenance costs	Extremely high	lower

JetBox 8152 CANbus benefits

The JetBox 8152 industrial communication computer is equipped with a CAN interface, making it easy for users to establish a reliable and efficient network structure. Its main advantages are as follows:

Low cost – Low bus maintenance costs and high utilization rate

Robust – Strong resistance to electromagnetic interference, suitable for extremely harsh industrial environments.

Long-distance (10km), high-speed (1Mbps) data transmission

Network flexibility and scalability – adding new nodes (purely for receiving or sending data) requires no modifications to the existing network's hardware or software.

A broad and reliable error-checking mechanism can ensure real-time checking of errors during transmission.
1. Intelligent reception or transmission of information via ID.
2. Automatically send sabotage information
3. Use shared information identifiers to distinguish information and define its content and priority.

Typical applications

Unlike RS-485 ports, which are primarily used in projects with a small number of nodes and transmission distances within 1km, CANbus ports are suitable for long-distance, multi-node applications, mainly used in embedded systems. The JetBox 8152's CANbus port is an ideal solution for extending network communication distances to 10km in noisy and harsh environments, providing high-performance, highly secure, and real-time data transmission. Combined with the flexible CANbus port, the JetBox 8152 industrial communication computer becomes an ideal choice for industrial control networks.

[Click here for more information about JetBox 8152]

CANbus – the key to reliable and efficient data transmission in multi-node networks!

Read next

CATDOLL CATDOLL 115CM Dora (TPE Body with Soft Silicone Head)

CAN Interface Design of Smart Instruments

CATDOLL 126CM Sasha (Customer Photos)

CATDOLL 128CM Chu