ICP DAS - I-2532

CAN Bus

I-2532

CAN Bus

I-2532 ~ NEW ~
CAN/Fiber Converter

Fiber optic transmission medium is a good material to protect data transmission from EMI/RFI interference and has been used in harsh environment extensively. On the other hand, CAN bus is famous in industrial application. In order to solve the problem between different transmission medium, I-2532 is specially designed for converting the electrical CAN bus signal to fiber optic cables.

The fiber length between two I-2532s can be up to 1.4km (4593ft), it is mainly decided by the cable attenuation of fiber and the CAN bus baud. I-2532 is the economic solution for applications which require protecting the data transmission from electrical exposure, surges, lightning or chemical corrosion.

back

Applications

• Control System• Building Automation• Factory Automation• Distributed data acquisition

back

Features

Build-in switch for 120Ω terminal resistance
Up to 100 CAN nodes on CAN Port
Transmission distance up to 1km on CAN Port
Transmission distance up to 1.4km on Fiber Port
Removable terminal block
Mountable on DIN Rail

back

Specifications

Fiber Port connector type: ST
Fiber Port operating wavelength: 850nm
Fiber type: 62.5/125μm, multi-mode
Compatible with CAN specification 2.0A and 2.0B
Fully compatible with ISO 11898-2
Support baud up to 500Kbps, auto-baud detection
Propagation delay: <125ns
Power consumption: 0.5W
Power supply: +10VDC ~ +30VDC
Operating temperature: -25°C ~ +75°C
Humidity: 5% ~ 95%, non-condensing
Dimensions: 32.3mm x 99.0mm x 77.5mm
ESD、EFT、Surge Protection：
- ESD：+/- 4KV Contact Discharge
- EFT：+/- 1KV
- Surge：+/- 2KV

back

Network Deployment

The definition of segment in a CAN bus system are shown as following figure. The segment 2 is fiber cable. Generally, the segment 1 and segment 3 are copper cable. The copper cable is a balanced (differential) 2-wire interface. It may be a Shielded Twisted Pair (STP), Un-shielded Twisted Pair (UTP), or Ribbon cable.

Users can refer to the following table to know the maximum node numbers in each segment following ISO 11898-2 and the maximum segment length when using different type of wire.

Wire Cross- Section [mm2]	The maximum segment length [m] under the case of specific node number in this segment
Wire Cross- Section [mm2]	16 Nodes	32 Nodes	64 Nodes	100 Nodes
~0.25 (AWG23)	< 220	< 200	< 170	< 150
~0.5 (AWG20)	< 390	< 360	< 310	< 270
~0.8 (AWG18)	< 590	< 550	< 470	< 410
~1.3 (AWG16)	<980	<900	<780	<670

Higher attenuation of fiber will reduce the transmission distance. Users can use following table to know the relationship between those two.

Attenuation [dB/km]	Fiber Length [m]
2.8	<1400
4	<400

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]	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 (LSEG1, LSEG2 …) and bus length (LBUS) 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)

back

Ordering Information

I-2532 CR

CAN/Fiber Converter (RoHS)

back