UHF RFID Readers (EPC Gen2 / ISO 18000-6C): Desktop, Long-Range, Handheld

Start from the job, not the longest range. A reader that reaches too far picks up tags you did not mean to read; one that reaches too short slows the operator down. Match the reader type to the task:

If the tag has to be read with nobody present — a car at a barrier, a crate passing a door — you need an integrated reader. If a person presents the tag, a desktop or handheld model is simpler to deploy. The guide fixed vs integrated vs handheld UHF readers covers the trade-offs, and the application notes for parking and vehicle access and inventory and asset tracking show where each type fits.

Every range on this page is the rated figure from the model's specification. Real range depends on the tag chip and antenna, the material it is attached to (metal and liquids detune UHF tags), the mounting position and RF noise on site. Test with your own tags before you fix a mounting position.

The desktop reader/writers use a built-in 2 dBi antenna with RF output adjustable from 12.5 to 26 dBm. A short field is an advantage at a desk: you want to read or encode the tag in front of you, not the rest of the stack.

All five integrated readers list RF output of 0–30 dBm, software adjustable, so power can be set within the local limit (in the US, for example, 4 W EIRP). The rated range rises with antenna gain; the larger panels are also heavier, which matters when you choose a pole and bracket:

Some models also list a higher figure in high-power mode; treat it as a best case, not a design value. The handhelds are rated at 0–35 cm (U520-M, which shows the tag ID on a 0.91-inch OLED), 0–50 cm (U510-B) and 0–3 m (U550-M). The U540-M adds a 1D/2D barcode imager; its RFID read range has not been confirmed, so test an evaluation sample with your own tags. The integrated readers are built for outdoor pole or wall mounting, but the current specification gives no IP rating; if your site needs one, confirm it in your quotation. See why one UHF reader reads 0.5 m and another 8 m.

UHF RFID is regulated country by country inside 860–960 MHz, and a reader must be set to a band that is legal where it operates. Order the band for the country where the reader will operate, not the country it ships from.

• Desktop reader/writers: 902–928 MHz (US band) or 920–925 MHz (China band); other regional bands on request.
• Integrated readers: 902–928 MHz or 865–868 MHz (the European band); other bands on request.
• Handhelds and U220-C: specified at 902–928 MHz (915 MHz). Ask whether your band is available before you order.

Put the destination country on your RFQ and the band is confirmed in your quotation. The guide UHF RFID frequency bands by country lists the common allocations.

Keyboard output. The desktop reader/writers type tag data at the cursor by default, like a USB keyboard; a virtual serial port version is available as a customized build. U510-B and U550-M send data as keyboard input over Bluetooth or a 2.4G USB receiver, and U220-C types the EPC number into any Android app. See keyboard-emulation readers.

Serial, Wiegand and network. The integrated readers output Wiegand 26/34, RS232, RS485 and USB; the -N builds (U610-N to U650-N) add TCP/IP Ethernet. One trigger input lets a vehicle loop or other sensor start reading, and reading can run continuously or on trigger. See RS232 and RS485 readers and Wiegand 26 vs 34.

SDK and tag writing. The integrated readers are supported by an SDK with C#, VC, VB, Java and Delphi sample code, a test demo and a tag read/write and issuing demo. The desktop units list write support, but no SDK is documented for them, so confirm the writing software in your quotation. The handhelds and U220-C do not list tag writing. Read how to write EPC, TID and user memory before you plan an encoding station.