Terminal
Description
A
max
2
CAN-L
1.5 mm
2
3
Shield
1.5 mm
2
4
CAN-H
1.5 mm
2
5
Not connected
1.5 mm
2
6
Not connected
1.5 mm
2
Table 25: Pin assignment
Topology
Please note that the CAN bus must be terminated with a resistor, which corresponds to
the impedance of the cable (e.g. 120 Ω, 1/4 W) at both ends.
The termination resistor is connected between CAN-H and CAN-L.
GND
CAN-L
CAN-H
CAN bus
GND
CAN-L
CAN-H
CAN bus
GND
CAN-L
CAN-H
CAN bus
~60 Ohms
Termination
Resistor
10 ~ 100 nF
~60 Ohms
Termination
Resistor
Or
Fig. 79:
CAN bus - termination
For very critical EMC conditions (many noise sources with high noise levels) and for high
transmission rates we recommend to use the 'Split termination concept' as shown.
• Divide the termination resistance into 2x60 Ohms with a center tap connected to
•
ground via a capacitor of 10 to 100 nF.
Maximum CAN bus length
The maximum length of the communication bus wiring is dependent on the configured
baud rate. Observe the maximum bus length.
(Source: CANopen; Holger Zeltwanger (Hrsg.); 2001 VDE VERLAG GMBH, Berlin und
Offenbach; ISBN 3-8007-2448-0).
114
easYgen-3000XT Series
B37574
3 Installation
3.4.4 CAN Bus Interfaces
Released