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L310-U 125kHz RFID Card Reader with USB Numeric Keypad

Q: What does the L310-U type when a card is read?

A 10-digit decimal card number followed by Enter, exactly as if it had been typed on a keyboard.

Q: Which keys does the L310-U keypad have?

0–9, F1–F5, Esc, Clear and Enter. They work like a standard USB numeric keypad alongside the card reader.

Q: Does the L310-U need a driver?

No. It enumerates as a USB human-input device on Windows XP, Vista, 7 and 10, Linux and Android.

Q: Is there a 13.56 MHz version of the L310-U?

Yes. The H310-U uses the same keypad with a 13.56 MHz reader for MIFARE and NTAG cards.

The L310-U combines a USB numeric keypad with a 125 kHz EM4100/TK4100 card reader, for POS, membership and attendance desks where staff scan a card and then key in a number. Cards read at up to 50 mm and are typed as a 10-digit decimal number followed by Enter; keys include 0–9, F1–F5, Esc, Clear and Enter.

Frequency: 125 kHz
Cards / tags: EM4100, TK4100, SMC4001 and EM4100-compatible cards and key fobs
Interface: USB, keyboard emulation
Output: 10-digit decimal card number + Enter
Read range: Up to 50 mm (30 mm for consistent reads)

Request a quote for L310-U 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 L310-U

Card reader and keypad in one — a single USB device replaces a separate reader and numeric keypad.
Card number plus Enter — each read types a 10-digit decimal number followed by Enter.
Full key set — 0–9, F1–F5, Esc, Clear and Enter for amounts, member numbers or shortcuts.
No driver — keypad and reader both work as a USB keyboard on Windows, Linux and Android.
Short, defined range — cards up to 50 mm (30 mm for consistent reads), key fobs up to 15 mm.
Blue LED and buzzer — confirm each card read.

Built for card-plus-number workflows

Many counters need a card and a number: a membership desk scans the card and keys a visit count, a canteen scans a staff card and enters an amount, a tool store scans a badge and types the item number. With a separate reader and keypad, the operator juggles two devices and two cables. The L310-U puts both on one 135 × 85 × 28 mm unit with a single 1400 mm USB cable.

The keypad and the reader both act as a USB keyboard, so card numbers and key presses arrive in the same application and no driver or SDK is needed.

Reading distance and output

The reader is meant for close presentation. Cards read at up to 50 mm, with 30 mm the distance for consistent reads, and key fobs at up to 15 mm. On a busy counter, that short range helps avoid reading a card that is simply lying nearby while the operator types.

Each read is typed as a 10-digit decimal number followed by Enter. If your system stores card numbers in another format, compare them with the card number converter and ask us before ordering.

L310-U or H310-U?

The H310-U is the same keypad with a 13.56 MHz reader for MIFARE and NTAG cards. Choose by the cards your members or staff already carry; 125kHz vs 13.56MHz explains how to tell them apart. For card reading without a keypad, see the L120-U flat pad.

L310-U specifications

General
Model	L310-U
Frequency	125 kHz
Form factor	USB numeric keypad with built-in card reader
Keys	0–9, F1–F5, Esc, Clear, Enter
Housing	ABS
Color	Black

Cards & reading
Supported cards	EM4100, TK4100, SMC4001 and EM4100-compatible cards and key fobs
Card operation	Read-only (card ID number)
Read range, card	Up to 50 mm (30 mm for consistent reads)
Read range, key fob	Up to 15 mm
Read time	< 200 ms
Read interval	< 0.5 s

Interface & output
Interface	USB, keyboard emulation
Driver	Not required
Output	10-digit decimal card number + Enter
Operating systems	Windows XP / Vista / 7 / 10, Linux, Android
Indicators	Blue LED and buzzer

Physical & environment
Dimensions	135 × 85 × 28 mm
Weight	Net 100 g; gross 150 g
Cable length	1400 mm
Power supply	5 V DC (USB)
Operating temperature	-10 °C to +70 °C
Storage temperature	-20 °C to +80 °C
Humidity	< 90 % RH

Specifications of L310-U 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 L310-U datasheet (PDF, A4)

Card, tag and system compatibility

Works with

✓EM4100, TK4100 and SMC4001 125 kHz cards
✓EM4100-compatible key fobs (read at up to 15 mm)
✓Windows XP, Vista, 7 and 10
✓Linux and Android hosts with USB keyboard support

Not designed for

✕Writing or copying cards (read-only reader)
✕13.56 MHz MIFARE and NFC cards — use the H310-U
✕Wiegand door controllers or card-plus-PIN door access (USB desktop device only)
✕Capturing reads when no input field has focus

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

Integration in 4 steps

1
Connect the USB cable to the POS terminal or PC. The keypad is detected as a keyboard; no driver is needed.
2
Click into the field for the card or member number.
3
Present the card within 30 mm: the buzzer and blue LED confirm the read and the 10-digit number is typed, followed by Enter.
4
Use the keypad for the next entry, such as an amount, quantity or member number, in the same application.

OEM / ODM options for L310-U

◆13.56 MHz MIFARE/NTAG version in the same keypad housing (H310-U)
◆Alternative card-number output format — feasibility confirmed in your quotation
◆Private-label marking and packaging — scope confirmed in your quotation

How OEM/ODM projects work →

Typical applications

L310-U FAQ

What does the L310-U type when a card is read?

A 10-digit decimal card number followed by Enter, exactly as if it had been typed on a keyboard.

How close does the card need to be to the L310-U?

Cards read at up to 50 mm, with 30 mm the distance for consistent reads. Key fobs read at up to 15 mm.

Which keys does the L310-U keypad have?