System manual CECX / Bus link module CECX-B-CO
34.6.2.2 Pin assignment
6
1
5
9
Reserved
Reserved
CAN +
GND
Reserved
Reserved
SGND
CAN -
Reserved
9-pin DSUB
female connector
Pin assignment, DSUB plug connection from front
34.6.2.3 Maximum cable length
The maximum cable length depends mainly on the set baud rate. The Baud
rate can be software adjusted individually for each CAN bus line.
With the modules currently in use the specific line delay in the lines results
in the following ratio between Baud rate and maximum cable length:
Baud rate
Max. cable length
typical
Max. cable length
guaranteed
6 ns/m
run time
5.2 ns/m run
time
6 ns/m
run time
5.2 ns/m run
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
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.
In addition, the cable length depends on the properties of the other CAN
bus line participants.
We recommend dimensioning the CAN cable so that it is only as long
as absolutely necessary.
34.6.2.4 Bus termination interface
The Bus termination must be activat
ed at the first and last participant. To
do this, pins 4 and 5 (TERm1) and pins 8 and 9 (TERm2) must be con-
nected.
CECX-II 34-11
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