Changing the COM port for a USB HART modem in Pactware

Written by: Dan Weise

I couldn’t communicate with a HART device. The configuration software I was using, Pactware, thought the USB HART modem was on COM 3, while Windows’ Device Manager showed it was actually on COM 6.

COM Port Post

COM Port Post 2

To change the COM port in Pactware to COM 6, I right clicked COM 3 and selected Parameter:

COM Port Post 3

The Parameter tab came up in the work area. I clicked on the serial interface drop down arrow to bring up the drop-down list of COM ports and selected the correct COM port as reported by Windows’ Device Manager, in my case COM 6.

COM Port Post 4

The project showed the newly changed COM port, now COM 6.

COM Port Post 5

I added a device and I was ready to roll:

COM Port Post 6

The catch is remembering that the COM port selection in Pactware is not a property, it’s a parameter.

If you’re still having difficulty, don’t hesitate to reach out.

(800) 953-7626

USB and Bluetooth HART modems available at

Want to learn more? Check out my other blog posts on Pactware

Lesman is the premiere stocking representative for process valving, controls, and measurement instrumentation, serving customers in Illinois, Indiana, Wisconsin, Eastern Missouri, Eastern Iowa, and Michigan’s Upper Peninsula.


Dan Weise, Lesman Product SpecialistDan Weise, Lesman product specialist, is an instructor for training classes on process instrumentation hardware, software, and technology.

Dan has been involved in all facets of data acquisition and process instrumentation since 1978, from sales and commissioning to service and support. He’s a long-time member of ISA, and has been with Lesman since 1988.

In his words, Dan’s the guy “who reads all the manuals nobody else reads”. In Lesman customers’ words, he’s the trainer to call if you want to “cut to the SO WHAT of instrumentation”, so it’s easy to understand.

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  1. #1 by Nickjhones on June 27, 2018 - 7:30 pm

    If you are not able to communicate with a hart device by using pactware software go through the troubleshooting given in the link.

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