ESD C.3034.02, Руководство пользователя, Страница: 39 / 123

Wiring Notes
CAN-CBX-THERMO
Manual • Doc.-No.: C.3034.21 / Rev. 1.2
Page 39 of 123
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6.3.2 Device Cabling
Fig. 17: Example for proper wiring with single shielded double twisted pair cables
6.3.3 Branching
Q
In principle the CAN bus has to be realized in a line. The participants are connected to the main
CAN bus line via short cable stubs. This is normally realised by so called T-connectors. When using
esd's CAN-T-Connector (order no.: C.1311.03) it should be noted that the shield potential of the
conductive DSUB housing is not looped through this T-Connector type. Thus the shielding is
interrupted. Therefore you have to take adequate measures to connect the shield potentials, as
described in the manual of the CAN-T-Connector. For further information on this read the
CAN-T-Connector Manual (order no.: C.1311.21).
Alternatively a T-connector can be used, in which the shield potential is looped through, e.g. the
DSUB9 connector from ERNI (ERBIC CAN BUS MAX, order no.:154039).
Q
If a mixed application of single twisted and double twisted cables is unavoidable, take care that the
CAN_GND line is not interrupted!
Q
Deviations from the bus structure can be realized by the usage of repeaters.
6.3.4 Termination
Q
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.
Q
9-pin DSUB-termination connectors with integrated termination resistor and male and female
contacts are available from esd (order no. C.1303.01).
Q
9-pin DSUB-connectors with integrated switchable termination resistor can be ordered e.g. from
ERNI (ERBIC CAN BUS MAX, female contacts, order no.:154039).