EPSON UB-U03II Driver

Epson UB-U03II - Troubleshooting Guide (DriverFiles)

Problem: Printer model unknown when only UB-U03II interface is visible

What users reported: One report describes an Epson POS printer fitted with a UB-U03II USB interface where the owner could not determine whether the mechanism was a TM-T20II, TM-T88II or TM-T88V. There were no identification stickers on the printer case, and installing various Epson drivers did not establish communication, so the user could not match the printer to the correct driver.

Why it happens: Information not available in provided sources.

How to fix: One fix reported was to turn the printer off, hold down the paper feed button, power the printer back on while still holding the button, and keep it pressed until a configuration page prints, since this printout includes the exact printer model.

One fix reported was to inspect the underside of the printer housing for a factory label, where another response notes that the brand, model number and serial number are normally printed.

One fix reported was to use the model information from the self-test printout or bottom label together with the UB-U03II interface type on Epson’s support site to download and install the specific driver package intended for that printer model.

Problem: Windows 10 fails to use a parallel-to-USB cable, requiring UB-U03II module

What users reported: One report describes connecting an Epson TM-T88III receipt printer to a Windows 10 system through a Sabrent USB-to-parallel IEEE 1284 cable. The Epson Advanced Printer Driver was installed, but Windows showed the printer as unavailable, Epson utilities reported communication failures, and Device Manager listed an unknown USB printing device instead of a working printer. The goal was to use the printer both on the host and inside a virtual machine for point-of-sale testing.

Why it happens: The report concludes that the Centronics-to-USB adapter did not function as a fully compatible printer port under Windows 10, so the operating system detected a generic USB printing device but could not pass ESC/POS printer data to the TM-T88III in a way the Epson driver could use.

How to fix: One fix reported was to remove the original serial or parallel communication board from the TM-T88III and replace it with an EPSON USB INTERFACE M148E UB-U03II module, which installs in the same slot using two screws.

One fix reported was to reinstall the Epson Advanced Printer Driver after fitting the UB-U03II interface, which allowed Windows 10 to recognize the printer over USB and communicate with it immediately.

One fix reported was to configure the connection using the Epson TM Virtual Port Driver Port Assignment Tool so that applications could send print jobs to a virtual port mapped to the UB-U03II USB interface, and then share that USB device into the virtual machine to enable receipt printing inside the POS lab environment.

Use the firmware and/or driver update advice on this page at your own risk; we are not responsible for any damage or malfunction to your hardware resulting from following our recommendations.

The Epson UB-U03II is a USB interface board designed specifically for Epson's line of point-of-sale (POS) printers, enhancing the connectivity options and overall functionality of these devices. 

By allowing printers to connect directly to POS systems via USB, this interface board improves data transmission speeds and simplifies the setup process compared to older serial or parallel connections. 

One of the key benefits of the EPSON UB-U03II is its support for high-speed data transfers, which is essential in fast-paced retail and hospitality environments where every second counts. By using USB 2.0 connectivity, the UB-U03II can handle larger print jobs efficiently.

The UB-U03II interface board also includes additional features that add to its utility, such as the ability to support multiple printers within the same POS system. This capability is especially beneficial for larger businesses where multiple printers might be used across different service stations, cashier points, or departments. 

Download the latest Epson UB-U03II drivers for Windows by browsing this page, and install them easily by following our short installation guide. 

Epson UB-U03II Driver

To download the most up-to-date Epson UB-U03II drivers, simply scroll down to the bottom of this page, fill in the Captcha, and click the Download button under the Captcha field. 

Once the download is complete, you will find a zipped folder containing the latest drivers for Windows.  Due to the release date of this model of USB interface devices by Epson, it only supports the following operating system versions: Windows XP, Windows Vista, Windows 7, Windows 8, Windows 10, and Windows 11.

Windows users will simply find an executable (exe) file in the dedicated folder. Running an executable file is very simple. To do so, just double-click on it, and follow any on-screen instructions that may appear.