Dynacord DPA 8150, User Manual

Page: 21 / 46

Figure 6.10: Assignment of the CAN connector
Pin Designation Cable color
T568A T568B
2 CAN_GND Green Orange
4 CAN_H (+) Blue
5 CAN_L (-) Blue stripes
7 MONITOR BUS + Brown stripes
8 MONITOR BUS - Brown
Table 6.3: Assignment of the REMOTE CAN BUS interface
Cable specification
In accordance with the ISO 11898-2 standard, shielded or unshielded twisted-pair cables with
an impedance of 120 ohms are preferably to be used as the data transfer cable for the CAN
bus. A terminating resistance of 120 ohms must be provided at both ends as the cable
terminator. The maximum bus length depends on the data transmission rate, the type of data
transmission cable, and the number of bus participants.
Bus length (in
m) Data transmission cable Connection
resistance (in
mΩ) Maximum data
transmission
rate
Resistance per unit
(in mΩ/m) Cable cross-
section
0 to 40 < 70 0.25 to 0.34 mm²
AWG23, AWG22 124 1000 kbit/s at
40 m
40 to 300 < 60 0.34 to 0.6 mm²
AWG22, AWG20 127 500 kbit/s at
100 m
300 to 600 < 40 0.5 to 0.6 mm²
AWG20 150 to 300 100 kbit/s at
500 m
600 to 1000 < 26 0.75 to 0.8 mm²
AWG18 150 to 300 62.5 kbit/s at
1000 m
Table 6.4: Relationships for CAN networks with up to 64 participants
If there are long cables and several devices on the CAN bus, terminating resistors with ohm
ratings higher than the specified 120 ohms are recommended in order to reduce the resistive
load for the interface drivers, which in turn reduces the voltage loss from one cable end to
another.
The following table allows initial estimates for the required cable cross-section for different
bus lengths and various numbers of bus participants.
PROMATRIX 8000 POWER AMPLIFIER Safety information | en 21
User manual 19-Aug-13 | 03 | F01U217494