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USB to Serial Adapter – Trouble Free!!

4.6875 out of 5 based on 16 customer ratings
(16 customer reviews )
USB to Serial Adapter - Trouble Free!!


Low Stock



We’re out of these temporarily due to worldwide shortages of parts making them harder to come by.  We have more on order, but it’s going to be a month or so before we have them.  In the meantime, here is a suitable alternative we’ve sourced:



This USB to Serial Adapter has been tested and works properly with all of our ECU products and all versions of TunerStudio on a wide range of operating systems.  This is probably the most common item we see people come back for after a purchase, so we highly recommend grabbing one now!  We highly recommend this adapter is used if your tuning PC/laptop doesn’t have a DB9 Serial connector. You can use another adapter with a genuine FTDI chipset (which this uses) and you’ll probably be good, but if you grab this you know you’ll be fine.

This adapter includes a 2′ extension cable, but we recommend not using it!    Instead,  plug the USB2920 adapter into your laptop USB port directly without using the USB extension which can pickup electrical noise like an antenna, then connect a RS232 serial cable from the USB2920 to your ECU as RS232 is less susceptible to such ‘noise’.  USB cable runs are more susceptible to noise than RS232, so we recommend using our standard 6′ tuning cable in combination with this adapter.

Product SKU: USB-2920 ( USB2920 )

Customer reviews

Rated 4.6875 out of 5 stars
16 reviews

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16 reviews for USB to Serial Adapter – Trouble Free!!

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Drivers for this adapter can be found on the FTDI website.

Am I required to use this particular adapter for connecting to MegaSquirt?

  • It is not the only adapter that can work, but our tech department is very familiar with this adapter and it is the only adapter we can provide full technical and warranty support for. With this adapter, you can talk to a support team who both knows the USB adapter and knows MegaSquirt fully.

When should I use the USB extension cable included with this unit?

  • The cable is useful if you are dealing with a high vibration environment. However, it also picks up large amounts of electrical noise. If you are using the USB extension cable and experience problems where the ECU goes offline once you start the engine, remove the extension cable and plug the adapter directly into the USB extension port, and use the DB9 straight through cable to connect the adapter to the ECU.

Why would I get less noise with the DB9 extension than with the USB extension?

  • The RS232 side of the system uses a +12 to -12 volt swing to send a signal. USB communications use a 0.0 to 0.3 volt signal. With a larger amount of signal and the same amount of noise, RS232 has a much better signal to noise ratio than USB in the same environment.

What chipset does this adapter use?

  • It uses an FTDI USB to RS232 converter chipset.

Where can I download the latest driver version for this adapter?

Questions & Answers

  1. 0 votes

    You can download the driver as a self installing executable

    This device does not have USB 3.0 capabilities.

  2. 0 votes

    TunerStudio does not support IOS. For a display app, you could use RealDash, which would connect over WiFi with a suitable WiFi to RS232 adapter.

  3. 0 votes

    It should work if it has a FTDI chipset, and will probably work if it has a Prolific chipset. Some other chipsets like the CH340 are more problematic. We would not be able to provide technical support for diagnosing problems that appear to be caused by the Insignia adapter if any arise; you would need to contact Insignia's technical support if you run into driver issues or similar problems.

  4. 0 votes

    Yes. We use them for this combination all the time at our shop.

  5. 0 votes

    Please try downloading and running the latest Windows driver, and see if that fixes it. We are using these on Windows 10 computers at our shop without any trouble.