Sensor Interface Unit (SIU)
Use your PC to interface sensors such as switches, pressure transducers, and
photoelectric detectors.  Available API & demo software, & source code.



  • Description
  • Diagram
  • Features
  • Licensing
  • Pricing

  • Sensor Interface Unit (SIU)
    Features RS-485 host communications, onboard address DIP switches, indicator LEDs,
    and convenient wiring scew terminals.  Accepts three different sensor types: switches
    transducers, & photoelectric detectors.  Multiple units can be daisy-chained on a single cable.


    The Sensor Interface Unit (SIU) is a smart controller capable of capturing data from a sensor device and delivering the data to a host PC.  The SIU is compatible for use with the following sensor types:
    • Switches
    • Pressure transducers
    • Photoelectric detectors
    The SIU uses RS-485 to communicate with a host PC.  Multiple SIU controllers may be utilized in any given application.  (All can be powered from one AC power adapter.)  Up to 32 SIU devices may be networked together on a single RS-485 cable.  Convenient terminal blocks are provided for sensor wiring and host interfacing.  The SIU utilizes a command/response protocol where the host PC polls each controller for new sensor data.  New data is available when a significant change occurs. 

    Kadtronix can develop a custom application to suit your requirements.  For developers who want to create their own applications, an applications programming interface (API) is available in a dynamic link library (DLL).  A demonstration project is also available (VC6, VC2008) and includes source code. 
    The SIU is suitable for a number of applications including the following:
    • Data acquisition
    • Industrial automation
    • Robotics
    • Vending machines
    • Equipment control
    • Pumping stations
    The following system diagram illustrates a typical configuration including host PC, three SIUs, and sensors.


    • Compatible with switches, photoelectric detectors, and transducers
    • Sensors also available for purchase
    • RS-485 (two-wire) host comm. interface
    • Uniquely addressable (0 to 31)
    • Supports predefined host commands
    • Status LED
    • Piezo beeper
    • Optional relay
    • Convenient terminal blocks for easy wiring
    • Slimline plastic enclosure with mounting flange
    • AC adapter (12vdc)
    • Available programmer's API & demo software (VC6, VC2008)

    Design Licensing

    This item is available for licensing to OEMs. This design is available for OEM licensing.  Licensing permits your company to manufacture this item and allows you royalty-free sales and distribution rights.  Click here for additional details.


    To request pricing, use the link below: 
    Request a Quote
    SIU Quote


    • This is a special order item.  Please allow 2 to 3 weeks for delivery.
    • Shipments will not contain a CD or other software media.  Any required media will be delivered electronically.  A valid email address is required to receive the download link.

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