Ethernet I/O Device: ETH32


(click image to enlarge)
  • Monitor and control devices over ethernet
  • General purpose I/O
  • Total of 34 I/O lines
  • 8 Analog input channels
  • Event monitoring
  • Ethernet connectivity
  • TCP/IP communications
  • DHCP support
  • Software libraries for Windows and Linux
See Also: All ETH32 Accessories,   Breakout Board for ETH32,   DB25 Slim Breakout Boards,   All Breakout Boards

General Description

The ETH32 is a general purpose I/O device which communicates using TCP/IP over an ethernet network. This device is ideally suited for remote data acquisition or device control; all that is needed is a connection to an ethernet network. The ETH32 supports up to five simultaneous TCP/IP connections, allowing multiple computers to communicate with the ETH32 device at one time. The ethernet connectivity and TCP/IP communication provide a great deal of flexibility, allowing the ETH32 to be located a long distance away from the PC if so desired.

The ETH32 includes a variety of useful features for data acquisition, monitoring, and control purposes. In addition to digital I/O, certain I/O lines can function as analog inputs, digital counters, and pulse width modulation (PWM) outputs. One of the powerful and useful features of the ETH32 is its event monitoring capabilities. In a nutshell, event monitoring allows the ETH32 to monitor different input signals and send a notification to your application when that signal has changed or met your criteria. Since the monitoring is constantly performed directly by the ETH32, it provides a much better alternative to polling over the ethernet connection. It provides faster response, is very efficient with network traffic and CPU resources, and is typically much easier to implement in your application. Event monitoring capabilities are included for digital I/O ports, analog channels, and digital counters.

A number of convenient product accessories are available for the ETH32.

Device Features

  • Devices with firmware v3.000 and above (now shipping) support DHCP.
  • Devices with firmware v3.000 and above also now provide 256 bytes of user-accessible EEPROM memory storage (non-volatile - maintained through power loss).
  • A total of 34 I/O lines
  • All I/O lines can function as digital I/O, each being individually configurable as an input or an output
  • Eight of the I/O lines support analog readings with a 10-bit ADC
  • TCP/IP communication over 10BaseT Ethernet allows flexibility in placement and usage
  • Event monitoring allows the device to monitor digital I/O lines, analog signal thresholds, and counter values and notify a PC when criteria has been met. This allows very fast monitoring of signals without introducing any network traffic until something significant happens
  • 32 of the digital I/O lines support event monitoring
  • Analog signals can also be monitored by the device, with events fired whenever the signal falls below or rises above user-defined thresholds
  • Supports five simultaneous TCP/IP connections, allowing multiple computers to monitor and control the device
  • Two user-controllable status LEDs directly on the ETH32
  • Two of the I/O lines can be configured as digital counters, one 16-bit and one 8-bit. Hardware Events are also supported on the counters. A counter can be configured so that an event fires when the counter reaches a specified value.
  • Two of the I/O lines can be configured as PWM outputs.
  • Several product accessories are available.

Software Features

  • Comes with software libraries for Windows (supports XP, Vista, Windows 7, 8, 10) and Linux, making it very simple to use the device.
  • Includes support for Microsoft .NET languages (C#, VB.NET, etc), C / C++, and Visual Basic 5/6. A user-contributed REALbasic library is also available.
  • The protocol used over the TCP/IP socket is documented for those who want to do the network programming themselves or are using an unsupported platform.
  • Comes with a configuration application that allows the device's IP address, subnet mask, and gateway to be configured, or DHCP to be enabled or disabled over the network connection. This uses UDP broadcast packets to detect all ETH32 devices on the local subnet and configure the selected device. By using UDP broadcast packets, a device can be configured even if its current IP address does not match the local subnet.

Product Documents

Part #DescriptionDocument
ETH32 - User ManualETH32 User ManualPDF
ETH32 - APIETH32 API DocumentationPDF
ETH32 - ProtocolETH32 Communication Protocol (for advanced users)PDF
ETH32 - Config ProtocolETH32 UDP Configuration Protocol (for advanced users)PDF
ETH32 - User Manual

ETH32 User Manual


ETH32 API Documentation

ETH32 - Protocol

ETH32 Communication Protocol (for advanced users)

ETH32 - Config Protocol

ETH32 UDP Configuration Protocol (for advanced users)


Revision Log

See the Product Revision Log for a history of product changes.


Complete documentation, software, examples, and source code are available for download from the ETH32 Downloads Page.

Pricing and Ordering

Product # Description 1+ 5+ 10+ RoHS Buy Now
ETH32 Ethernet I/O Device $225.00 $215.00 $210.00  Yes
WWD075-04-0 Wall Power Supply, Linear, 7.5V DC, 0.4A, 2.1mm I.D., Center Positive $17.00 $17.00 $16.50  Yes
BRKW01-C Breakout board for ETH32, Captive Screws $44.95 $42.80 $40.65  Yes

RoHS   Yes
Ethernet I/O Device
RoHS   Yes
Wall Power Supply, Linear, 7.5V DC, 0.4A, 2.1mm I.D., Center Positive
RoHS   Yes
Breakout board for ETH32, Captive Screws

All of the above items are normally stocked. Please call us if you need to verify availability for a specific quantity, or for pricing at higher quantities. Please visit our ordering page for our ordering policies and a list of ordering methods.


Wall power supply (WWD075-04-0) - suitable power supply for use with the ETH32

ETH32 Breakout boards - provides convenient screw terminals and solder pads for all the I/O lines and ground connections

DB25 Breakout boards - provides convenient screw terminals and solder pads for DB25 connectors

DB25 Slim Breakout boards - provides convenient screw terminals and solder pads for DB25 connectors; small footprint

DB25 extension cables - extends the I/O lines from the device to your workbench, project, etc

DB25 connectors - connect your projects to the ETH32

Network cables and accessories - connect the ETH32 to your ethernet network

Special Requirements

If your project requires an unusual operating environment or other conditions outside of the standard ETH32 specifications, please contact Winford Engineering. Some possibilities include:
  • Conformal coating of the PCB for harsh operating environments.
  • Unusual I/O pin or auxiliary power current requirements.
  • Operating temperature outside the given specifications.

Product Revision Log

Date Hardware Rev. Description
12/05/2005 Rev. A Initial product launch
05/18/2010 Rev. A Launched v3.000 firmware with additional features: DHCP support, user-accessible EEPROM storage, and various updates
06/20/2011 Rev. B Modified Analog VCC (AVCC) power supply circuit to improve power supply stability during Port 3 I/O transients.
      -Lowered LC filter inductance value
      -Raised LC filter capacitance value
03/23/2016 (software) Software-only update: Distribution v2.03 released, which includes API v2.01, fixing a bug where old response data could get passed to the PC software application in certain scenarios.

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