ICP DAS USA I-2532 Manual Do Utilizador
I-2532 CAN to Fiber Converter Quick Start User Guide (ver. 1.1, 2008/10/03) -----4
6. Bus Length & Fiber Length
Higher attenuation of fiber will reduce the transmission distance. Users
can use following table to know the relationship between those two.
Attenuation [dB/km]
Ideal Fiber Length [m]
2.8
<1400
4
<400
The limitation of baud on a CAN network 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.
The relationship between baud and bus length is displayed below.
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.
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 the CAN
network, the ideal bus length should less than 950 meters (1000-
25*2=950).
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 the CAN
network, the ideal bus length should less than 950 meters (1000-
25*2=950).
Fiber
I-2532
I-2532
ISO 11898-2
ISO 11898-2
L
seg1
L
seg2
L
seg3
L
BUS
= L
seg1
+ L
seg2
+ L
seg3