With all remote power amps, the factory data rate setting defaults to 10 kbit/s. The use of repeaters is generally recom-
mended when the bus-length exceeds 1,000 m.
CAN-Bus Cable Specifications
According to the ISO 11898-2 standard, CAN-bus data transfer cabling has to be carried out using Twisted-Pair cables
with or without shielding providing a characteristic impedance of 120 Ω. Both ends of a CAN-bus need to be
terminated with 120 Ω termination-plugs.
The maximum bus-length depends on the actual data transfer rate, the kind of data transfer cable being used, and the
total number of participants on the bus. The following table shows the most essential parameters for CAN-networks
consisting of up to 64 participants:
Bus Length (inm)
Data Transmission Cable
Termination (inΩ)
Max. Data Transfer Rate
Resistance per
Unit Length (in
mΩ/m)
Cable Diameter
0...40
< 70
0,25...0,34 mm²
AWG23, AWG22
124
1000 kbit/s bei 40 m
40...300
< 60
0,34...0,6 mm²
AWG22, AWG20
127
500 kbit/s bei 100 m
300...600
< 40
0,5...0,6 mm²
AWG 20
150...300*
100 kbit/s bei 500 m
600...1000
< 26
0,75...0,8 mm²
AWG 18
150...300*
62,5 kbit/s bei 1000 m
* With longer cables and many participants on the CAN-bus, termination resistors with higher impedance than the
specified 120 Ω are recommended to reduce the ohmic load of the interface drivers and therefore the voltage drop bet-
ween the two cable-ends.
The following table is meant for first assessment of necessary cable diameters for different bus lengths and bus-par-
ticipant numbers:
Bus Length (inm)
Number of Units on the CAN-Bus
32
64
100
100
0,25 mm² or AWG24
0,34 mm² or AWG22
0,34 mm² or AWG22
250
0,34 mm² or AWG22
0,5 mm² or AWG20
0,5 mm² or AWG20
500
0,75 mm² or AWG18
0,75 mm² or AWG18
1,0 mm² or AWG17
Additionally, the length of branch lines – for participants that are not directly connected to the CAN-bus – is also of
importance. For data transfer rates of up to 125 kbit/s, the maximum length of a single stub cable should not exceed 2
m. For higher bit rates a maximum length of only 0.3 m is recommended. The entire length of all branch lines in a
network should not exceed 30 m.
General Note:
–
As long as only short distances (up to 10 m) are concerned, common RJ-45 patch cables with 100 Ω characteristic
impedance (AWG 24 / AWG 26) can be used for the cabling inside of a rack-shelf system.
–
The previously outlined guidelines for network cabling are mandatory as far as the rack-shelve interconnection or
fixed installations are involved.
IRIS-Net
IRIS-Net | en
73
Bosch Security Systems B.V.
User Manual
2017.05 | 3.20 | F.01U.119.956
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