IOX Expansion Module

IOX Expansion Module

Use the IOX to collect, log and visualize IoT data from everyday sensors and meters, communicate with devices over serial interfaces, and control relays and actuators found in building and industrial automation systems. Easily share data with remote clients and cloud applications for alerts, analytics and more.

The IOX is a compact, programmable companion module to SmartServer™ IoT for connecting to industrial devices. It features multiple configurable digital I/Os and serial interfaces for controlling or communicating with devices such as digital sensors, dry contact relays, push buttons, etc. It also features optional power measurement for accurate energy metering


Hardware and electrical specifications

  • 2MB flash memory
  • Input power: 12-42VDC 0.25A or 10-30VAC 50/60 Hz 0.23A, or 5VDC when powered by USB
  • Power LED, Ready LED, I/O LED indicators
  • Reset and Connect buttons
  • Temperature range: -20°C to +85°C
  • IP 20 rating
  • Form factor: DIN 43880 4TE


  • USB C 2.0: 1 port for connection to SmartServer IoT
  • Digital inputs: 8 @ 0-31V; each with 5 configurable ranges
  • Digital outputs: 6 optically isolated digital outputs with 100mA sink
  • Relay outputs: 2 relay contacts; each supports up to 277VAC@10A or 30VDC@10A
  • Power measurement input (Metering model only): Measures 100-277VAC (up to 3 phases) voltage, current and power via external CTs; 0.5% accuracy; screw terminal
  • RS-485: 1 4-connection screw terminal block for Modbus RTU
  • RS-232: 1 UART compatible interface
  • 5VDC: 1 reference voltage output, 50mA max current



Digital input modes

  • Digital level input with optional edge trigger implemented as a dry contact with external voltage source or sourced by I/O expander power output
  • Frequency input with a range of 1Hz to 20kHz with a minimum resolution of <0.5% collected over configurable interval (1/s to 1/3600s)

Digital output modes

  • Digital level output implemented with an open drain requiring external pull up
  • Frequency outputs with minimum range of 1Hz to 20KHz; 0.005Hz minimum resolution
  • Configurable single pulse output with normally high or normally low output; 0 to 30 day range; 1ms minimum resolution
  • Configurable pulse width modulated output with a configurable normally high or normally low output; 2ms to 30s period range; minimum resolution of 0.4% of the period

Safety and compliance

  • CSA/UL 62368-1, EN 62368-1
  • FCC Part 15 Class B, EN 55032, EN 55024, AS/NZS CISPR 32 Class B
  • RoHS II


  • Local I/O expansion module for Dialog’s SmartServer IoT
  • Programmable using IAP/MQ APIs
  • Configurable digital inputs and outputs 
  • Isolated RS-485 interface for Modbus RTU
  • RS-232 interface that can be accessed from SmartServer IoT applications and drivers
  • USB interface to the SmartServer IoT
  • Optional high accuracy power metering 
  • Data read by the IOX is logged in the SmartServer IoT or accessible by remote clients and applications
  • Push button reset/connect and LED status indicators
  • 5 VDC reference power source can be used to power simple devices
  • Industrial grade specifications for use in most facilities, factories and infrastructure projects


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