Correct Wiring of Electrically Isolated CAN Networks
6.3.2 Cabling
●
To connect CAN devices with just one CAN connector per net use a short stub (< 0.3 m)
and a T-connector (available as accessory). If this devices are located at the end of the
CAN network, the CAN terminator “CAN-Termination-DSUB9” can be used.
Figure 9:
Example for proper wiring with single shielded single twisted pair wires
6.3.3 Termination
●
A termination resistor has to be connected at both ends of the CAN bus.
If an integrated CAN termination resistor which is equipped at the CAN interface at the end
of the bus is connected, this one has to be used for termination instead of an external CAN
termination plug.
●
9-pin DSUB-termination connectors with integrated termination resistor and male and
female contacts (gender changer) are available from esd (order no. C.1303.01).
●
DSUB termination connectors with male contacts (order no. C.1302.01) or female contacts
(order no. C.1301.01) and additional functional earth contact are available, if CAN
termination and grounding of CAN_GND is required.
CAN-PCI/331
Hardware Manual • Doc. No.: C.2020.21 / Rev. 1.6
Page 19 of 27
CAN_L
CAN_GND
CAN_H
FE
CAN-DP/2
CAN-CBX-DIO8
CAN-CBX-AI420
l
< 0,3 m
l
< 0,3 m
l
< 0,3 m
Female Connector
Male Connector
Terminator
with FE connector
Female Terminator
(Order-no.: C.1301.01)
T-Connector
C.1311.03
CAN cable
Order-no.: C.1323.03
CAN 0
CAN 1
T-Connector
C.1311.03
T-Connector
C.1311.03
CAN Board
CAN cable
Order-no.: C.1323.03
CAN cable
Order-no.: C.1323.03
Termination connector
"CAN-Termination-DSUB"
Order-no.: C.1303.01
Termination connector
"CAN-Termination-DSUB"
with femal and male contacts
(Order-no.: C.1303.01)
e.g.
CAN-PCIe/402,
PMC-CAN/400,
CAN-USB/2, etc.
CAN_GND connected
to functional earth (FE)
at exactly one point
