U640-M 10 dBi long-range UHF RFID reader, front view of the tall off-white 240 × 420 mm panel

U640-M 10 dBi Long-Range UHF RFID Reader, 12 m+, Wiegand 26/34, RS485

Q: How far does the U640-M read?

It is rated to read beyond 12 m. Actual distance depends on the tag type and size, where it is fitted on the vehicle, the RF power you set (0–30 dBm) and the site. Test with your own tags at the final mounting position.

Q: What pole does the U640-M mount on?

The clamp bracket fits poles of 30–50 mm diameter, and the installation notes are based on a 2.2 m pole. Mount it with the arrow on the rear plate pointing up.

Q: Will the U640-M read tags in the next lane?

At full power it can. Lower the RF power, aim the panel down the lane rather than across it, and use triggered reading with a loop detector so the reader only reports the vehicle in position.

Q: Can the U640-M open a barrier on its own?

No relay output is listed for this reader. It sends the tag number to a parking or access controller over Wiegand, or to software over RS232/RS485, USB or TCP/IP, and that system switches the barrier.

The U640-M is a long-range integrated UHF RFID reader with a 10 dBi antenna in a narrow 240 × 420 mm portrait panel. It is rated to read EPC Gen2 tags beyond 12 m, depending on tag and site, for vehicle entry lanes and yard gates that report over Wiegand 26/34, RS232/RS485, USB or TCP/IP.

Frequency: 902–928 MHz or 865–868 MHz, specified at order; other bands on request
Cards / tags: ISO 18000-6C / EPC Gen2 passive UHF tags (read and write)
Interface: Wiegand, RS232, RS485, USB
Output: Wiegand 26 / 34
Read range: Beyond 12 m (rated; depends on tag and site)

Available versions

U640-MN-type: Wiegand 26/34, RS232/RS485, USB
U640-NE-type: adds TCP/IP Ethernet (Wiegand 26/34, RS232/RS485, TCP/IP, USB)

Request a quote for U640-M Order a sample Datasheet (PDF)

✓ Sample units for evaluation
✓ Output format confirmed for your software
✓ Private label & OEM options
✓ Reply within 1 business day

Why integrators choose the U640-M

Rated range beyond 12 m — a 10 dBi antenna and 0–30 dBm RF power can pick up tagged vehicles before they reach the barrier.
Narrow portrait housing — 240 mm wide and 420 mm tall, so it fits on a slim post or beside a barrier cabinet.
Frequency hopping (FHSS) — hops across the ordered 902–928 MHz or 865–868 MHz band.
Controller and software outputs — Wiegand 26/34 to the controller, RS232/RS485 or USB to software, TCP/IP on the U640-N.
Triggered or continuous — one trigger input lets a loop detector start each read cycle, with a buzzer indicator.
Fits 30–50 mm poles — at 1.55 kg, it mounts on a clamp bracket for slim poles of 30–50 mm diameter.

A long-range panel for narrow posts

The U640-M puts its 10 dBi antenna in a 240 × 420 × 56 mm portrait housing, which suits a narrow gate post, a barrier cabinet or a gantry upright where a 444 mm square panel will not fit. The reader electronics sit in a box on the rear plate, with the cables leaving through glands at the bottom.

The clamp bracket takes poles of 30–50 mm diameter, and the installation notes are based on a 2.2 m pole. An arrow on the rear plate marks the top edge.

Reading early in the lane

With a rated read range beyond 12 m, the U640-M can identify an approaching vehicle before it reaches the barrier. That gives the controller time to check the tag and raise the arm, which can cut waiting time at the gate. Suitable sites include fleet depots, logistics yards, truck gates and residential entries.

Long range also means the reader can see tags you did not intend: vehicles in the exit lane, or parked cars near the gate. Lower the RF power, aim the panel down the lane and use the trigger input with a loop detector to keep reads to the vehicle in position. More on system design in parking and vehicle access; the read range guide explains what limits distance.

U640-M or U650-M?

Choose the U640-M for a lighter, narrower reader (1.55 kg, 240 mm wide) on a lane where 12 m is enough. Choose the U650-M (12 dBi, 0–20 m, 444 × 444 mm) for wide entrances or when the reader has to sit well back from the lane.

U640-M specifications

General
Model	U640-M (N-type) / U640-N (E-type with TCP/IP)
Product type	Long-range UHF RFID reader with integrated antenna
Frequency	902–928 MHz or 865–868 MHz, specified at order; other bands on request
Air interface	ISO 18000-6C, EPC Class 1 Gen 2
Antenna	Built-in, 10 dBi
RF output power	0–30 dBm, software adjustable
Frequency mode	FHSS (frequency hopping)

Tags & reading
Supported tags	ISO 18000-6C / EPC Gen2 passive UHF tags (read and write)
Read range	Beyond 12 m (rated; depends on tag and site)
Read speed	< 6 ms average per 64-bit single-tag read
Read mode	Continuous (active) or triggered (passive), set by software
Trigger input	1
Indicator	Buzzer

Interface & output
Interfaces, U640-M	Wiegand, RS232, RS485, USB
Interfaces, U640-N	Wiegand, RS232, RS485, TCP/IP, USB
Wiegand formats	Wiegand 26 / 34
Serial / USB data	Format set in the configuration software
SDK and software	Sample code in C#, Visual C++, VB, Java and Delphi; test demo; tag read/write and issuing demo

Physical & environment
Dimensions	240 × 420 × 56 mm
Weight	1.55 kg (3 kg packed)
Power supply	DC 12 V, 3 A
Operating temperature	-20 °C to +65 °C
Storage temperature	-45 °C to +95 °C
Mounting	Pole clamp bracket for 30–50 mm poles, or wall
Color	Off-white

Specifications of U640-M as supplied for the standard version. Read range depends on the card or tag, mounting surface and environment — we can test your own cards before you order.

Download the U640-M datasheet (PDF, A4)

Card, tag and system compatibility

Works with

✓ISO 18000-6C / EPC Gen2 passive UHF tags: windshield tags, cards, labels and hard tags
✓Access and parking controllers with a Wiegand 26 or 34 input
✓Loop detectors or photo-beams on the trigger input
✓PC software over RS232, RS485 or USB via the SDK; server software over TCP/IP (U640-N)

Not designed for

✕125 kHz or 13.56 MHz cards — see access control readers
✕Active (battery-powered) tags
✕Switching a barrier directly — no relay output is listed; the controller or software does this
✕Writing tags over Wiegand — use the SDK or demo over serial, USB or TCP/IP

Card not listed? Send us the card type or a photo and we will confirm compatibility before you buy.

Integration in 4 steps

1
Clamp the bracket to a 30–50 mm pole, fix the reader with the arrow on the rear plate pointing up, and aim the panel down the approach lane.
2
Connect a DC 12 V, 3 A supply and the data link: Wiegand D0/D1 to the parking controller, RS485 to a PC, or Ethernet on the U640-N.
3
In the demo software, start at a moderate RF power, choose continuous or triggered reading, and wire the trigger input to the loop detector if used.
4
Drive tagged vehicles through both lanes and past the gate, then raise or lower RF power until only the intended lane is read.

OEM / ODM options for U640-M

◆902–928 MHz or 865–868 MHz build; other UHF bands on request
◆N-type U640-M or E-type U640-N with TCP/IP Ethernet
◆RF power and read mode pre-set to your site values before shipment, on request
◆Cable length and connector on request
◆Private label on the product label and carton, on request
◆Supply with or without pole bracket and power adapter — confirmed in your quotation

How OEM/ODM projects work →

Typical applications

U640-M FAQ

How far does the U640-M read?

It is rated to read beyond 12 m. Actual distance depends on the tag type and size, where it is fitted on the vehicle, the RF power you set (0–30 dBm) and the site. Test with your own tags at the final mounting position.

What pole does the U640-M mount on?