15
Branch cables
A CAN bus converter is used to provide reliable
long
branch cables. This means the branch cable is
disconnected from the other CAN bus network and can be viewed as an independent CAN bus net
-
work.
Trials at the factory
have shown the following:
1) Branches with a star topology of up to 10 m will not impede transmission.
2) Up to a bus length of 250 m and a transfer rate of 50 kbit/s, data transfer works perfectly with a
low number of CAN nodes and an inexpensive
J-Y(St)Y EIB KNX 2x2x0.8
KNX bus cable with a char
-
acteristic impedance of 75 to 90 ohm.
3) Up to a bus length of 150 m and with only a few nodes, the
CAT 5 24AWG
cable (typical Ethernet
cable in PC networks) can be used.
Changing to cable types with different characteristic impedances is only permitted via signal sepa
-
ration through a CAN bus converter.
However, such networks do not comply with the recommended specification. Technische Alternative
RT GmbH therefore cannot guarantee trouble-free operation if one of the three options listed above
is applied.
