Electro-Voice P3000RL owner manual Can-Bus, Cable Specifications

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CAN-BUS

Baud Rate

Bus Length

500 kbit/s

100 m

250 kbit/s

250 m

125 kbit/s

500 m

62.5 kbit/s

1000 m

20 kbit/s

2500 m

10 kbit/s

5000 m

The CAN-bus allows using different data rates, with the data rate being indirectly proportional to the bus length. Small networks allow baud rates up to 500kbit/s.

For sizable dimensioned networks reducing the baud rate (minimum 10kbit/s) is necessary.

The integration of repeaters is generally recommended when the bus-length exceeds 1,000m.

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 120Ω. Both ends of a CAN-bus need to be terminated with 120Ω termination-plugs.

The maximum bus-length depends on the actual data transfer rate, the kind of data transfer cable being used, as well as the total number of participants on the bus. The following table shows the most essential coherencies for CAN-networks consisting of up 64 participants:

 

Cable for data Transmission

 

max.

Bus Length

 

 

Termination

Resistance per

 

Cable Diameter

Data Transfer Rate

 

Unit Length

 

 

 

 

 

 

 

 

 

 

0 ... 40 m

< 70 mΩ/m

0.25 ... 0.34 mm²

124 Ω

1000 kbit/s at 40 m

AWG23, AWG22

 

 

 

 

 

 

 

 

 

40 ... 300 m

< 60 mΩ/m

0.34 ... 0.6 mm²

127 Ω

500 kbit/s at 100 m

AWG22, AWG20

 

 

 

 

 

 

 

 

 

300 ... 600 m

< 40 mΩ/m

0.5 ... 0.6 mm²

150 Ω ... 300 Ω*

100 kbit/s at 500 m

AWG20

 

 

 

 

 

 

 

 

 

600 ... 1000 m

< 26 mΩ/m

0.75 ... 0.8 mm²

150 Ω ... 300 Ω*

62.5 kbit/s at 1000 m

AWG18

 

 

 

 

*With longer cables and many participants on the CAN-bus, termination resistors with higher impedance than the specified 120are 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

Number of Appliance on the CAN-Bus

 

32

64

100

100 m

0.25 mm² or AWG24

0.34 mm² or AWG22

0.34 mm² or AWG22

250 m

0.34 mm² or AWG22

0.5 mm² or AWG20

0.5 mm² or AWG20

500 m

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 125kbit/s, the maximum length of a single stub cable should not exceed 2m. For higher bit rates a maximum length of only 0.3m is still permissible. The entire length of all branch lines should not exceed 30 m.

General Note:

As long as only short distances (up to 10m) are concerned, common RJ-45 patch cables with 100characteristic 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.

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Contents OWNER‘S Manual Bedienungsanleitung Contents InhaltImportant Service Instructions Description Unpacking & Warranty Installation Notes Front View DSP OUT Rear ViewParallel Connection Control PortRemote can BUS RS-232 InterfaceAddress Easy Remote Power Amplifier OutputsGROUND-LIFT Switch Bridged Mode LF-CONNECTION Cords Remote Control NetworkCabling Network Examples Network Examples Cable Specifications CAN-BUSMains Operation Mains Operation & Resulting TemperatureResulting Temperature Inside the Power Amplifier Page Bedienungsanleitung Inhalt Wichtige Sicherheitshinweise Beschreibung Installationshinweise Auspacken & GarantieFrontseite Input a / Input B ParallelRückseite Endstufenausgänge GROUND-LIFT SchalterBridged Mode NF-VERBINDUNGSKABEL Remote Control NetzwerkVerkabelung NETZWERK-BEISPIELE NETZWERK-BEISPIELE Leitungsspezifikationen Wärmeentwicklung in DER Endstufe Netzbetrieb & WärmeentwicklungNetzbetrieb Specifications / Technische Daten DIM30Power Requirements Block Diagram Amplifier Block Diagram RCM-24 Channel BDimensions / Abmessungen 440,5 132,5Page Page Page USA