U2irda Mini 4 Mbps Fir Usb Irda 20 Portable -
Troubleshooting: If the device shows as “Unknown” or fails to start, disable USB selective suspend in Power Options. Some U2IRDA clones require forcing the irsir.sys driver manually via “Update driver” → “Let me pick” → “Infrared devices” → “Generic IrDA Serial Dongle.”
This is the standout specification.
Most Linux kernels include the irda-usb or mcs7780 driver. u2irda mini 4 mbps fir usb irda 20 portable
sudo modprobe mcs7780
# Check detection:
dmesg | grep -i irda
Use irattach or irda-utils to bind the device.
| Problem | Likely Fix |
|---------|-------------|
| Device not detected | Reinstall driver; try another USB port (avoid USB 3.0 hubs). |
| Connection drops | Reduce distance to 15cm; clean IR lenses. |
| Only 9.6 kbps works | FIR chip may be incompatible – set adapter to SIR mode. |
| Windows “Infrared device not found” | Run Irprops.cpl; ensure legacy Infrared support is enabled (Windows 7). |
| No data transfer | Check that both devices use same IrDA protocol version. | Troubleshooting: If the device shows as “Unknown” or
The U2IRDA Mini is a compact USB-to-IrDA (Infrared Data Association) bridge adapter. It allows modern computers (laptops/desktops) to communicate with legacy devices that use infrared ports, such as old PDAs (Palm, HP iPAQ), feature phones (Nokia, Sony Ericsson), calculators (HP48), scientific instruments, and industrial equipment.
Key specs: 4 Mbps FIR (Fast Infrared) support, USB interface, portable 20cm cable design. Use irattach or irda-utils to bind the device
The “Mini” and “Portable” descriptors are accurate. The U2IRDA typically weighs under 20 grams. Its translucent plastic housing reveals a single IR LED and a receiver photodiode. Unlike older motherboard IrDA headers (which required an external transceiver), this is a complete self-contained solution.
Portability strengths:
Physical placement tip: For best 4 Mbps FIR performance, position the dongle within 30 cm (12 inches) of the target device, with less than a 15-degree angular misalignment. Direct sunlight or fluorescent lighting can cause interference—use a small shade or work indoors.
If you own a Palm Pilot, Handspring Visor, HP iPAQ, Sharp Zaurus, or an old Nokia/Siemens feature phone, IrDA was the primary sync method. This adapter allows you to extract contacts, notes, and calendars before the device’s memory degrades.
