23
Id.-Nr.: 1556.212.1-07
Connections and wiring
Cable length
The minimum cable length is dependent on the baud rate of the CAN bus transmis-
sion.
Minimum bend radius
During installation: 48 mm
For installed cable: 24 mm
Further information about CAN cable length and transmission rates can be requested
from LTI.
Connecting CAN modules with modules (without an optocoupler)
Baud rate
Max. cable length typical
Max. cable length guaranteed
6 ns/m propaga-
tion time
5.2 ns/m propa-
gation time
6 ns/m propaga-
tion time
5.2 ns/m propa-
gation time
125 kbit/s
561 m
647 m
542 m
625 m
250 kbit/s
269 m
311 m
250 m
289 m
500 kbit/s
124 m
143 m
104 m
120 m
800 kbit/s
61 m
70 m
42 m
48 m
1 Mbit/s
40 m
46 m
21 m
24 m
Information
Further information on CAN baudrates and cable lenghts can be requested
directly from LTI.
The length specifications in the table are maximum values based on ideal
conditions. The practical cable length is reduced by poor shielding contact,
strong interference, stub lines and poor cable quality.
Furthermore, the cable length is dependent on the properties of the remain-
ing CAN bus modules and on the optocouplers used (if present).
It is recommended to dimension the CAN cable as long as absolutely nec-
essary.
5.1.2
RS-232-C
Cable type
Shielded standard cable.
Plug type
9-pole D-SUB socket connector with completely conductive shield.
The cable shielding must be connected over a wide area with the shield cover of the
plug. An additional connection between the shield and the ground is not necessary.
Cable length
Max. 15 m.
Minimum bend radius
During the installation: 60 mm.
For installed cable: 50 mm.
5.1.3
RS-485/422
Cable type
Shielded, twisted pair data cables with a characteristic impedance of 100 – 120 Ω.
Plug type
9-pole D-SUB socket connector with completely conductive shield.
The cable shielding must be connected over a wide area with the shield cover of the
plug. An additional connection between the shield and the ground is not necessary.
Cable length
Maximum cable length is dependent on the transmission rate: 115 kbit/s: maks.
1,200 m.
