How To forum


Converting usb port to com port

by racerboy146 / March 27, 2013 10:21 AM PDT


I have some old data aquisition software that I bought a long time ago, and it only uses com ports to communicate to external devices. But all of my devices are using usb connections, and I only have usb ports on my computer. I need to somehow make the usb port show up as a com port so that my data aquisition software can collect the data from my devices. Is there some free software out there that makes usb connections show up as com ports?


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All Answers

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Probably an expansion card is best bet
by wpgwpg / March 27, 2013 10:27 AM PDT

You can buy expansion cards that will add serial ports to your computer. They're not expensive, so that's probably your best bet assuming you're going to do this with a desktop PC (you didn't say).

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added info
by racerboy146 / March 27, 2013 11:31 PM PDT

I use a laptop. (Windows 7 64 bit)

Also, I don't think I explained my problem correctly. My software is old, and only can use com ports to communicate. But my external devices are much newer, and use usb ports to communicate. (not com ports) I'm trying to make the devices look like they are using a com port to communicate, and not a usb port. I don't need an adapter, as the devices already use the usb ports. I'm just trying to make them show up as a com port. I don't know how to write software, so I'm trying to find a program that will allow me to make the usb port show up as a com port.

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Re: serial port
by Kees_B Forum moderator / March 27, 2013 11:44 PM PDT
In reply to: added info
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Again, I do this.
by R. Proffitt Forum moderator / March 28, 2013 4:39 AM PDT
In reply to: added info

I shared the adapter I use and I can set it to be COM1.

Now there are some folk that have such and this is why they keep an old desktop around. How about you? You may be in that group.

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I do this!
by R. Proffitt Forum moderator / March 27, 2013 3:03 PM PDT

I use the usb to rs232 from

But keep in mind I write my own apps but this can be set to com1 etc.

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