I-2532

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.

 

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    Description

     

    Applications

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

    Features

    • Compatible with CAN specification 2.0A and 2.0B
    • Fully compatible with the ISO 11898-2 standard
    • Support a range of baud rates from 10kbps ~ 500Kbps
    • Jumper for 120Ω terminal resistor of the CAN bus
    • Fiber Port: ST (Multi-mode)
    • Fiber Cable: 50/125 μm , 62.5/125 μm, 100/140μm
    • Wave Length: 850 nm
    • Auto-baud detection
    • up to 100 nodes on CAN port
    • Removable terminal block
    • Mount easily on DIN-rail
    • 3 kv galvanic isolaton
    • One CAN and one fiber channel

     

    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
    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)

    Hardware Specifications

    CAN Interface
    Connector
    8-pin screwed terminal block (CAN_GND, CAN_L, CAN_H, N/A for others)
    Baud Rate (bps)
    10 k ~ 500 k
    Transmission Distance (m)
    Depend on baud rate
    Terminal Resistor
    Switch for 120Ω terminal resistor
    Specification
    ISO-11898-2, CAN 2.0A and CAN 2.0B
    Fiber Interface
    Connector
    ST (Multi-mode)
    Wave Length
    850 nm
    Fiber Cable
    50/125 μm , 62.5/125 μm, 100/140 μm (62.5/125μm is recommended)
    Propagation Delay
    125ns max (125ns delay shortens bus line length by ~ 25 m)
    Transmission Distance (m)
    1.4 km max (in 62.5/125 μm fiber cable)
    LED
    Round LED
    PWR LED, TD LED, RD LED
    Power
    Power supply
    Unregulated +10 ~ +30 VDC
    Protection
    Power reverse polarity protection, Over-voltage brown-out protection
    Power Consumption
    0.5 W
    Mechanism
    Installation
    DIN-Rail
    Dimensions
    32.3mm x 77.5mm x 99.0mm (W x L x H)
    Environment
    Operating Temp.
    -25 ~ 75 ℃
    Storage Temp.
    -30 ~ 80 ℃
    Humidity
    10 ~ 90% RH, non-condensing

    Hardware Structure

    Wire Connection

    Pin Assignment

    I/O Internal Structure

    Ordering Informations

    I-2532 CR
    		 CAN/Fiber Converter (RoHS)

    Datasheet

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