Okay, I understand your frustration. Sharing HART communicators can be a pain, and missing leads is a classic field issue! Setting up a laptop as a HART communicator is a good idea, providing flexibility and documentation capabilities. Let's break down the options and considerations.

First, let's clarify the hardware/software components needed HART Modem

You will need a USB HART modem to physically interface your computer to the 4-20mA loop. There are a few good options:

ProComSol USB HART Modem

This is a well-respected brand and a popular choice. They are relatively affordable and generally reliable.

Pepperl+Fuchs USB HART Interface

Another reputable brand, often a bit more expensive but known for quality.

Other Brands

There are other brands like Smar, Moore Industries, and some less well-known ones. Read reviews carefully. Avoid super-cheap unknown brands.

Software (HART Communication Software)

This is the software you'll install on your laptop to interpret the HART data received through the modem. This is where the DTMs enter the picture.

DTM (Device Type Manager)

These are device-specific drivers that allow the software to understand and communicate with individual HART devices (transmitters, valves, etc.). They are like printer drivers for HART devices. Without the right DTM, the software can’t “talk” the language of the specific device you’re connecting to.

Software Options & Considerations PACTware



Pros

PACTware is a free, open-source software platform. Many HART modem manufacturers bundle a copy with their hardware. Because it's an open platform, it can work with a wide variety of HART devices and modems.

Cons

As you noted, the biggest issue is DTMs. Finding the correct DTM can sometimes be difficult. You need to download them from the device manufacturer's website (e.g., Rosemount, Endress+Hauser, Siemens, etc.). Different vendors are better than others about making these easy to find and download. Also, the interface is… utilitarian. It's not the prettiest, and the learning curve can be a bit steeper than some commercial options. Sometimes the DTM files get corrupted and cause issues.

Recommendation

PACTware is a good starting point, especially if your company uses instruments from a limited number of manufacturers. If you primarily work with Rosemount transmitters, for example, it's worth setting up PACTware and downloading the Rosemount DTM library.

Commercial HART Communication Software



Examples

There are several paid options, including:

Field Communicator Apps (e.g., from Emerson, Siemens, Endress+Hauser)

These are often tied to specific brands of equipment. For example, if you use a lot of Rosemount transmitters, Emerson's AMS Trex Device Communicator (and the software you might install on a PC to support it) may be a good fit. These are typically feature-rich, with advanced diagnostics and reporting capabilities. Usually these require a license.

ProComSol DevCom2000

This is a dedicated HART communication software package. It aims to be a universal communicator, supporting a wide range of devices. They usually have a subscription model and update DTM libraries.

Pros



Easier DTM Management

Many commercial packages have built-in DTM libraries or make it easier to find and install the correct DTM. Some even offer automatic DTM updates.

User-Friendly Interface

Commercial software typically has a more polished and intuitive user interface than PACTware.

Technical Support

You get (or should get) technical support from the vendor.

Advanced Features

Commercial options often include advanced diagnostic tools, trending, calibration management, and reporting features.

Cons



Cost

Commercial software can be expensive, both the initial purchase and ongoing maintenance/updates.

Vendor Lock-In

Some software may be optimized for, or even require, specific brands of HART modems or devices.

Personal Experience and Recommendations


Start with PACTware (or your company's preferred free option)

It's free, so you have nothing to lose by trying it. Download the software, get a HART modem, and then download the DTMs for the devices you commonly work with.2.

Document the DTMs

Keep a list of the DTM files you've downloaded and where you got them. This will save you time later.3.

Evaluate Your Needs

After using PACTware for a while, assess your needs. Are you spending too much time hunting for DTMs? Do you need more advanced features? Is the interface frustrating you? If the answer to any of these is yes, consider a commercial option.4.

Consider Brand Loyalty (Maybe)

If your plant primarily uses instruments from one or two manufacturers, look at the software offered by those manufacturers. It might be the most seamless and cost-effective solution in the long run.5.

Consider a Universal Option

If you use a wide variety of HART devices, look at software like ProComSol DevCom2000. They are designed to work with many devices.
6.

Trial Versions

See if the commercial options offer a trial version. Download and try it out.

Tips for DTM Hunting



Manufacturer's Website

The manufacturer's website is always the first place to look. Search for the device model number and "DTM."

HART Communication Foundation

The HART Communication Foundation (HCF) used to have a DTM library, but it's now largely defunct. However, some legacy links might still be helpful.

Device Revision

Make sure you download the correct DTM for your specific device revision. Using the wrong DTM can cause problems.

Google is Your Friend

Use Google to search for the DTM file. Someone else may have already found it and posted a link.

Contact the Manufacturer

If you can't find the DTM, contact the manufacturer's technical support. They should be able to help you.

Important Considerations



Security

Be careful when downloading DTMs from unknown sources. Stick to the manufacturer's website or reputable sources.

Compatibility

Ensure the software you choose is compatible with your operating system (Windows 10/11) and the HART modem you're using.

Loop Resistance

When connecting to a 4-20mA loop, make sure the loop resistance is within the HART device's specification. Too much resistance can prevent communication. Typically the resistor in the loop should be between 250 ohms and 500 ohms.

In summary: Start with PACTware (or your company's preferred free option), get a good HART modem, and be prepared to hunt for DTMs. As you gain experience, you can decide if a commercial solution is worth the investment. Good luck! Flag for review