Electro-Voice IRIS Net RCM-26 Mode D'emploi page 21

Resistance
Bus Length
(in m)
0...40
40...300
300...600
600...1000
* 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
between the two cable-ends.
The following table is meant for first assessment of necessary cable diameters
for different bus lengths and bus-participant numbers.
Bus Length
(in m)
100
250
500
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
meters. For higher bit rates a maximum length of only 0.3 meter is still
permissible. The entire length of all branch lines should not exceed 30 meters.
Data Transmission Cable
per Unit
Cable Diameter
Length
(in mΩ/m)
0,25...0,34 mm²
< 70
AWG23, AWG22
0,34...0,6 mm²
< 60
AWG22, AWG20
0,5...0,6 mm²
< 40
0,75...0,8 mm²
< 26
Number of Units on the CAN-Bus
32
0,25 mm²/AWG24
0,34 mm²/AWG22
0,75 mm²/AWG18
Termination
150...300*
AWG 20
150...300*
AWG 18
64
0,34 mm²/AWG22
0,5 mm²/AWG20
0,75 mm²/AWG18
Max. Data
(in Ω)
Transfer Rate
1000 kbit/s
124
500 kbit/s
127
at 100 m
100 kbit/s
at 500 m
62,5 kbit/s
at 1000 m
0,34 mm²/AWG22
0,5 mm²/AWG20
1,0 mm²/AWG17
RCM-26 Remote Control Module
Owner's Manual
at 40 m
100
21