Opto-isolated 4-20mA to
Modbus and USB

  • Four opto-isolated analog inputs
  • 16 bit Sigma Delta converter
  • Additional USB port for direct connection to a computer

The ADI-524 is 4-20mA analog input interface converter to Modbus RTU over RS485 or over USB. It has 4 opto-isolated analogue inputs and RS485/USB output. Extra isolated 24V power supply for 4-20mA sensor/devices and DIP switch for baud-rate and address setting.
USB port make this device perfect to use with industrial computers and gateways with USB port.
It can be mounted on standard DIN rail or by using clamps.



  • Temperature sensors, laser distance sensors, other industrial sensors
  • Industry, infrastructure and energy and water supply systems
Input interface4 x 4-20mA isolated inputs
Conversion resolution16bit
Output interfaceModbus RTU and Modbus RTU by inbuilt USB to serial converter
Baudrate9600, 19200, 38400, 115200
Modbus address range1-15
Configuration6 way DIP switch for serial baudrate and Modbus address
Status indicators4 x 4-20mA, 1 x serial data, 1 x power (dual colour)
Other option24V DC isolated power output for 4-20mA sensors
Power8-36V DC with reverse polarity protection, 8-24V AC or 5V from USB port
Operating temperature-20°C to 75°C
HousingAluminium housing with DIN rail mounting option
Dimensions88mm x 54mm x 35mm
Operating systemEmbedded system
Device compatibilityLinux, Windows, MAC OS
DriversUSB to serial driver to use by USB interface

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  • Online documentation
    The documentation page provides detailed product specifications and complete instructions for use. Please read it before using the product.