UGREEN 20224 2m USB to DB25 Parallel Printer Adapter
Overview
UGREEN 20224 allows a modern USB-A host to address selected legacy printers through a DB25 parallel interface. The adapter itself can enumerate without a separate converter driver on listed systems, but that does not install the printer model. Printing succeeds only when the operating system has a compatible driver for that printer and maps it to the adapter port.
What it does well.
Key features
Highlights
- Direction: USB-A male host connection to DB25 female printer-side connector.
- Length: 2m.
- Active conversion: USB-to-parallel electronics inside the cable assembly.
- Printer protocol: IEEE 1284-oriented bidirectional communication where supported by printer and driver.
- Maximum stated adapter rate: up to 12Mbps.
- Bus powered: no separate adapter power supply.
- Explicit scope: selected parallel printers only; scanners, engravers and Zip drives are excluded by this product information.
Connector, direction and driver map
Know the controls and roles
This adapter is directional by system role even though printer data can be bidirectional. Start at a USB host and end at a supported parallel printer.
- USB-A male: plugs into a computer, dock or hub that provides a working USB host data port.
- Converter electronics: enumerate as a USB printing/parallel bridge; they do not become a generic hardware LPT port for every legacy device.
- DB25 female: mates with a printer’s DB25 male parallel port and can be secured with the thumbscrews.
- Printer driver: must support the printer model on the installed operating system.
- Print path: application → operating-system print spooler → printer driver → USB adapter → printer parallel interface.
- Power: adapter electronics are powered from USB; the printer still uses its own normal power supply.
Use scenarios
Where it makes sense
The cable is a narrow compatibility bridge for an otherwise serviceable legacy parallel printer.
- Connect a supported inkjet, laser or receipt printer with DB25 male parallel port to a USB-A computer.
- Replace a missing native parallel port when a compatible printer driver exists for the current host system.
- Use through a suitable data-capable USB hub or dock after proving the adapter directly on the computer.
- Maintain a legacy print workflow where the application prints through the operating-system spooler rather than direct hardware LPT timing.
- Secure the DB25 connection in a fixed workstation so the heavy connector does not loosen during use.
- Not suitable for industrial control, hardware dongles, scanners, engravers, Zip drives or timing-dependent direct-port software.
Setup and usability guidance
A dependable first connection
Verify the physical printer port and operating-system driver before connecting the cable.
- Power the printer off and inspect its port. Confirm a 25-pin male D-sub parallel connector—not a female DB25, 36-pin Centronics or serial port.
- Download or locate the correct printer driver from the printer maker and confirm it supports the installed operating system architecture/version.
- Connect the DB25 female end squarely to the printer’s male port and tighten both retaining screws by hand.
- Plug the USB-A end directly into the computer, then power the printer on and allow the USB printing adapter to enumerate.
- Install/select the printer model and assign it to the adapter’s available USB/virtual printing port in system printer settings.
- Print a system test page, then a representative application document; confirm text, graphics, paper size and bidirectional status behavior.
- If direct operation succeeds, add any required hub/dock and retest. Avoid changing several variables at once.
Compatible devices and systems
Match the whole chain
Both the connector and the software chain must match; a DB25 shape alone does not establish parallel-printer compatibility.
- Parallel printers with a male DB25 printer port and a driver that supports the host operating system.
- USB-A host computers or data-capable USB hubs/docks.
- Linux systems where both the USB printing bridge and printer driver are supported.
- Not compatible with scanners, engravers, Zip drives, serial RS-232 equipment, DB25-female devices or Centronics-only printers without a different purpose-built interface.
What this product does
Capabilities
- Converts a USB host print path to a supported DB25 parallel-printer interface.
- Mates its DB25 female connector with a printer’s DB25 male port.
- Supports bidirectional printer communication where the printer, driver and operating system permit it.
- Provides a 2m physical connection and USB bus power for the converter.
- Can enumerate without a separately installed converter driver on listed systems.
- Allows the operating-system spooler and printer driver to send conventional print jobs.
What this product does not do
Clear boundaries
- It does not install or replace the printer’s operating-system driver.
- It does not create a universal hardware LPT port for direct-I/O DOS, industrial or copy-protection applications.
- It does not support scanners, engravers or Zip drives.
- It does not convert RS-232 serial data even though some serial connectors also use a DB25 shell.
- It does not mate with a DB25 female printer port, nor with a 36-pin Centronics printer port.
- It does not raise legacy print performance to USB 2.0’s 480Mbps rate.
What to do
Good practice
- Inspect and count pins before purchase; match adapter DB25 female to printer DB25 male.
- Confirm the printer driver supports the intended operating system before disconnecting an old working setup.
- Power the printer through its normal supply and secure the DB25 screws gently.
- Test directly on the host before adding a hub, dock, virtual machine or print server.
- Keep a copy of the working driver installer and record the selected system print port.
- Use the system spooler and eject/uninstall the printer cleanly before major OS upgrades.
What not to do
Avoid these mistakes
- Do not force the DB25 connector, mate two female ends or confuse a 25-pin serial port with a parallel printer port.
- Do not buy it for a scanner, engraver, Zip drive, hardware key or industrial machine.
- Do not assume “driver-free adapter” means the printer itself needs no driver.
- Do not expect direct hardware LPT addresses, interrupt timing or DOS software access.
- Do not overtighten the retaining screws, bend pins or let the connector hang by the cable.
- Do not upgrade beyond the listed operating-system range without first confirming printer and adapter support.
Warnings and limitations
Important safety and performance notes
Legacy peripheral compatibility often fails at the printer-driver layer even when the cable plugs fit perfectly.
- The printer must have its own safe, correct power supply. The adapter only powers its conversion electronics from USB.
- DB25 connectors can also carry serial or proprietary signals. Confirm the port is explicitly a parallel printer interface.
- A virtual machine may not expose the USB printing bridge or legacy driver as expected; test the complete virtualisation workflow.
- Old printers can have mechanical, consumable or firmware faults independent of the adapter; preserve a known-good baseline where possible.
Care, troubleshooting and buying checklist
Keep it working and solve common issues
Separate physical fit, USB enumeration, printer-driver installation and actual printing into distinct tests.
- Adapter not detected: try a direct host USB-A port, remove hubs, inspect the cable and review system USB devices.
- Adapter appears but no printer: install the printer driver and select the correct USB/virtual printing port.
- Job stays queued: confirm printer power, online state, paper/consumables and clear/restart the spooler after selecting the right port.
- Garbled output: verify the driver and printer language/model; a generic driver may send the wrong command stream.
- No bidirectional status: some printer/driver combinations do not expose every status function through the bridge even when printing works.
- Connector will not mate: stop; verify the printer is DB25 male. Do not use force or a gender changer to bypass an interface mismatch.
- Buying check: require USB-A host, DB25-male parallel printer, supported OS and an available printer-specific driver.
Technical specifications
Model details
Brand / SKU
UGREEN 20224
Product type
Active USB-to-parallel printer adapter cable
Length
2m
Host connector
USB-A 2.0 male
Printer connector
DB25 female with retaining screws
Required printer port
DB25 male parallel printer interface
Parallel standard
IEEE 1284-oriented printer communication
Maximum stated adapter rate
Up to 12Mbps
Power
USB bus powered adapter electronics; no external input
Converter driver
Adapter can enumerate without a separate converter driver on listed systems
Printer driver
Required for the printer and host OS
Explicitly unsupported devices
Scanners, engravers and Zip drives
10.4 Tiger through 13 Ventura listed; macOS 14 Sonoma and later excluded
Colour
Grey
Package contents
- 1 Ă— UGREEN 20224 2m USB-A male to DB25 female parallel printer adapter cable