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Wired 125 kHz USB RFID reader, HD-RD20X

GTIN: 5907614660147 · SKU: HD-RD20X

The HD-RD20X is a compact, wired 125 kHz RFID card and tag reader. It connects to a computer with a USB cable — the system recognises it as an HID keyboard, so no drivers need to be installed. The reader reads tags with chips such as EM4100, TK4100 or SMC4001 from up to 80 mm away and confirms every read with a light and sound signal. It is suited to warehouse systems, access control and time and attendance.

HD-RD20X RFID reader in a black housing with a card graphic

Table of contents​

Specifications​

  • Material: ABS
  • Reading method: automatic
  • Read confirmation: light and sound signal
  • Reading speed: up to 200 ms
  • Reading distance: 0.5–80 mm
  • Time between reads: 0.5 s
  • Operating frequency: 125 kHz
  • Power supply: USB, 5 V DC
  • Interface: USB
  • Cable length: 140 cm
  • Device dimensions: 94 × 60 × 10 mm
  • Package dimensions: 125 × 85 × 38 mm
  • Device weight: 130 g
  • Weight with packaging: 300 g
  • Operating temperature: −10°C – +70°C
  • Storage temperature: −20°C – +80°C
  • Operating humidity: 0% – 90%
  • Storage humidity: 0% – 90%
  • Output format: 10-digit decimal
  • Supported chip types: EM4100, TK4100, SMC4001, EM4200, EM4305, T5577

Kit contents​

  • RFID reader
  • USB cable

Features​

  • Operating frequency: 125 kHz.
  • Automatic tag reading.
  • Read confirmation with a light and sound signal.
  • Reading speed up to 200 ms.

Usage​

The device is simple and intuitive to operate, so the reader is convenient for beginners and advanced users alike.

1. Connecting the device​

  • Use the included USB cable to connect the reader to a computer or another device with a compatible USB port.
  • The reader is automatically detected as an HID keyboard. No additional drivers need to be installed.
HD-RD20X reader with the USB cable connected

2. Preparing to read​

  • Make sure the RFID tag you want to read is compatible with the reader (supported chips include EM4100, TK4100 and SMC4001).
  • Bring the tag to within 80 mm of the reader.

3. Reading​

  • When the reader detects a tag, it reads the data automatically.
  • A correct read is signalled with light and sound. If there is no signal, check that the tag is within range and is not damaged.

4. Using the data​

  • The data read is sent to the connected device immediately, where it can be used in a warehouse management system, access control or other applications.

5. Taking care of the device​

  • Store the reader at −20°C to +80°C to ensure a long service life.
  • Avoid humidity above 90% and direct impacts.
HD-RD20X RFID reader on a glossy surface

Frequently asked questions​

What frequency does the HD-RD20X operate on?
125 kHz. It reads tags with chips such as EM4100, TK4100 and SMC4001.
Does the HD-RD20X require driver installation?
No. The system recognises the reader as an HID keyboard and installs it automatically once it is plugged into a USB port.
From what distance does the reader read tags?
From 0.5 to 80 mm. The range depends on the type and quality of the tag.
What should I do if the reader does not signal a read?
Check that the tag is within the reader's range, that it works at 125 kHz and that it is not damaged.
In what format does the reader send the tag number?
As a 10-digit decimal number, typed into the active window as if it were entered on a keyboard.
Can the reader read 13.56 MHz cards?
No. The HD-RD20X works only at 125 kHz.

Downloads​

The manuals and datasheets as PDF, in case an offline copy is needed. Everything in them is also on this page.