ICP DAS USA I-2532, User Manual

Page: 13 / 14

I-2532 CAN to Fiber Converter User Manual (ver. 1.1, 2008/10/03) ------13
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.
Table 3-5 Baud, Bus Length
Baud [bit/sec] Ideal Bus Length [m]
500K < 100
250K < 250
125K < 500
50K < 1000
20K < 2500
10K < 5000
The definition of segments the relationship between segment length
(L
SEG1
, L
SEG2
…) and bus length (L
BUS
) in the same CAN bus system are shown
in the following figure.
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).
Fiber
I-2532 I-2532
ISO 11898-2 ISO 11898-2
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