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ICP DAS has been developing various CAN products for several years, including PCI interface, converter, PAC and slot module CAN products. ICP DAS holds CAN conference, exhibition and training course all of the world. We also help customers to resolve various CAN technology problems. In addition, we can provide CAN bus solution for our customers.

 
 
   
 
   

CAN Bus Features
The Controller Area Network (CAN) is a serial communication way, which efficiently supports distributed real-time control with a very high level of security. It provides the error process mechanisms and message priority concepts. These features can improve the network reliability and transmission efficiency. Furthermore, CAN supplies the multi-master capabilities, and is especially suited for networking “intelligent” devices as well as sensors and actuators within a system or sub-system.

Multi-master
When the bus is free any unit may start to transmit a message. The unit with the message of highest priority to be transmitted gains bus access.

Safety

In order to achieve the utmost safety of data transfer, powerful measures for error detection, signaling and self-checking are implemented in every CAN node. When transmitting data, many measuring algorithms including Cyclic Redundancy Check, Message Frame Check and Bit Stuffing have been taken.

Speed & Distance

Baud (bit/sec)
Ideal Bus Length
1M
25
800K
50
500K
100
250K
250
125K
500
50K
1000
20K
2500
10K
5000

Arbitration
If two or more nodes start transmitting messages at the same time, the arbitration mechanism is applied to guarantee that one of these messages can be sent successfully according to the priority.

Priorities

The CAN IDENTIFIER defines a static message priority during bus access.

 


 
   
 
   
Bus length [m]
Bus cable
Termination
resistance
[Ω]
Baudrate
[kbit/s]
Length-related
resistance
[mΩ/m]
Wire
cross-section
[mm2]
0 ~ 40
70
0.25 ~ 0.34
124
1000 at 40 m
40 ~ 300
<60
0.34 ~ 0.6
150 ~ 300
>500 at 100 m
300 ~ 600
<40
0.5 ~ 0.6
150 ~ 300
>100 at 500 m
600 ~ 1000
<26
0.75 ~ 0.8
150 ~ 300
>50 at 1 km

Wire cross-section
[mm2]
Maximum length [m]
Node = 32
Node = 64
Node = 100
0.25
200
170
150
0.5
360
310
270
0.75
550
470
410

Example:
If user use Baudrate 100 kbit/s and wire cross-section 0.5 mm2, the maximum length can arrive to 500 m. But the maximum length is in inverse proportion to the node number. When the node number is up to 32, the maximum length will down to 360 m.

 
   
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