Baud And Bus Length - ICP DAS USA I-2532 User Manual

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3.4 Baud and Bus Length

The limitation of baud on a CAN bus system is restricted by propagation
delay. On the other hand, long bus length leads to long propagation delay. The
relationship between baud and bus length is displayed below.
Baud [bit/sec]
The definition of segments the relationship between segment length
(L , L ...) and bus length (L
SEG1 SEG2
in the following figure.
ISO 11898-2
Figure 3-2 Segment Length and Bus Length
When users add one pair of I-2532 into a CAN bus system, the ideal bus
length will reduce 50 meters because the propagation delay of one I-2532 is
equal to the propagation delay caused by 25 meters bus length. For example,
if users use baud 50Kbps and add two I-2532s into a CAN bus system, the
ideal bus length should less than 950 meters (1000-25*2=950).
I-2532 CAN to Fiber Converter User Manual (ver. 1.1, 2008/10/03) ------13
Table 3-5 Baud, Bus Length
Ideal Bus Length [m]
500K
250K
125K
50K < 1000
20K < 2500
10K < 5000
) in the same CAN bus system are shown
BUS
Fiber
I-2532
< 100
< 250
< 500
ISO 11898-2
I-2532