HomeHMI Programming Cable “HMI Omron NT-Series” Programing Cable

[DIY-Cable] “HMI Omron NT-Series” Programing Cable

[DIY-Cable] “HMI Omron NT-Series” Programing Cable Making Tips

[DIY-Cable] “HMI Omron NT-Series” Programing Cable

Reviving Legacy Machines: Crafting Your Own Omron HMI Om-NT Programming Cables

The Omron HMI Om-NT has a storied history in the world of industrial automation. Despite no longer being in production, these HMI units continue to play a vital role in various industrial applications. Repairing and maintaining these older machines, however, can be a daunting task due to the scarcity of available programming cables. In this comprehensive guide, we will delve into the process of creating NT-Series HMI cables from scratch, equipping you with the knowledge to keep your legacy machines operational.

The Legacy of Omron HMI Om-NT

The Omron HMI Om-NT, with its enduring legacy, has been a cornerstone of industrial automation for many years. These robust and reliable human-machine interfaces have been trusted in countless applications, and their presence continues to be felt in various industries. Despite advancements in HMI technology, many businesses and facilities rely on these older Omron models to power their processes.

The Cable Conundrum

One of the major challenges in maintaining Omron HMI Om-NT units lies in sourcing the necessary programming cables. With these units no longer in production, off-the-shelf cables are scarce and often expensive when available. This predicament has led many industrious technicians and engineers to explore the possibility of crafting their own cables.

DIY Solution: Creating NT-Series HMI Cables

Creating your own programming cables for Omron HMI Om-NT units is a practical and cost-effective approach to keeping these legacy machines up and running. Fortunately, this process does not require an extensive background in electronics. With the right components and a step-by-step guide, you can craft these cables with relative ease.

Components You’ll Need

Before you embark on creating your own NT-Series HMI cables, gather the following components:

1. Male and Female COM DB-9 Connectors

These connectors are the heart of your DIY cable project. Ensure that you obtain high-quality connectors to guarantee the durability and reliability of your cables.

2. Shielded Cable

Select a shielded cable to prevent interference and signal loss. The cable should have enough wires to accommodate the specific requirements of your Omron HMI Om-NT unit.

3. Soldering Iron and Solder

A soldering iron and solder are essential tools for connecting the wires to the DB-9 connectors securely.

4. Wire Stripper and Cutter

You’ll need these tools to prepare the cable and connectors for soldering.

5. Wiring Diagram

Obtain a wiring diagram that details the pin connections between the DB-9 connectors and your Omron HMI Om-NT unit. This diagram is crucial for a successful cable assembly.

Crafting Your NT-Series HMI Cable

Now that you have all the necessary components and tools, follow these steps to create your own NT-Series HMI cable:

Crafting Your NT-Series HMI Cable

1. Prepare the Cable

Start by cutting the shielded cable to your desired length. Ensure that the cable length is sufficient for your application.

2. Strip the Cable Ends

Use the wire stripper to carefully strip the ends of the shielded cable. You should expose enough wire for soldering onto the DB-9 connectors.

3. Examine the Wiring Diagram

Refer to the wiring diagram specific to your Omron HMI Om-NT unit. This diagram will illustrate which wires need to be connected to each pin on the DB-9 connectors.

4. Solder the Connections

Carefully solder the stripped cable ends to the corresponding pins on both the male and female DB-9 connectors. Ensure that the connections are secure and free from any stray solder.

5. Insulate the Connections

To prevent any short circuits or interference, insulate the soldered connections with heat-shrink tubing or electrical tape.

6. Test Your Cable

Before deploying your newly crafted NT-Series HMI cable, test it with your Omron HMI Om-NT unit to verify that the connections are accurate and that the cable functions as intended.

Troubleshooting and Tips

While crafting your own NT-Series HMI cable, you may encounter some challenges. Below, you’ll find some troubleshooting suggestions to assist you on your journey:

  • Check the Wiring Diagram: Ensure that you are following the correct wiring diagram for your specific Omron HMI Om-NT unit model. Using an incorrect diagram can lead to connection issues.
  • Inspect Your Soldering: Thoroughly examine your soldered connections. Loose or poorly soldered wires can result in unreliable cable performance.
  • Test Continuity: Use a multimeter to test for continuity between the connectors and cable ends. This can aid in detecting any wiring mistakes.
  • Use Quality Components: Invest in high-quality connectors and shielded cable to ensure the longevity and reliability of your cable.
  • Safety First: When soldering, be cautious of hot soldering irons and ensure you are working in a well-ventilated area.


Crafting your own Omron HMI Om-NT programming cables is a practical solution for maintaining and repairing legacy machines. With the right components, tools, and a reliable wiring diagram, you can create custom cables that meet the specific requirements of your HMI unit. This DIY approach not only saves you money but also empowers you to extend the lifespan of your valuable equipment.

As technology advances, legacy machines like those powered by Omron HMI Om-NT units remain valuable assets in various industries. By mastering the art of creating your own cables, you can continue to rely on these trusted workhorses for years to come. Whether you’re a seasoned technician or a DIY enthusiast, this guide equips you with the knowledge to keep your legacy machines operational and productive.

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