UEIModbus 300 – 3-Slot Modbus TCP based DAQ and Control Cube

Flexible, 100Base-T, industry standard, Modbus TCP-based data acquisition and control chassis with 3 I/O slots


The UEIModbus™ cubes are compact, rugged, Ethernet based data acquisition and control interface that communicates with a host computer or PLC over Modbus TCP. It is ideally suited for a wide variety of industrial monitoring and control applications.



  • Industry standard Modbus TCP interface
  • Slots for 3 I/O boards
  • Over 30 different I/O boards available
  • Up to 75 analog or 144 digital I/O per cube
  • Rugged: tested -40 to +85°C, 5g Vibration, 50g shock
  • Compact: 4″ x 4.1″ x 4.0″
  • Extremely cost effective
  • Web/HTML configuration
  • AC, DC or battery powered

The Modbus messaging protocol is used to establish master-slave/client-server communication between intelligent devices. It is a defacto standard, truly open and the most widely used network protocol in the industrial manufacturing environment. Modbus devices communicate using a master-slave configuration.


The UEIModbus 300 Cube functions as a Modbus slave that is easily accessed by any software client acting as a Modbus master. Most popular HMI software supports the Modbus protocol.

There are currently over 30 difference I/O boards supported by the UEIModbus. It supports all AI, AO, DI, DO and CT layers that are compatible with UEI’s Cube architecture. (Other Cube-based products include the PowerDNA, UEILogger and UEIPAC families.)