eSSL KR503-M — 13.56 MHz Mifare RFID Card Reader (Mifare with Relay Output)

Description

A Pondicherry boutique resort needs Mifare RFID at the staff-only back-of-house corridor — the corridor separates the front-of-house guest area from housekeeping prep, kitchen back-station and laundry, and the resort manager wants encrypted Mifare cards so a lost or copied EM card cannot quietly authorise back-of-house entry. The back-of-house door is a simple swing door with an EM lock; the project does not justify a separate access controller cabinet just for one door. A Mifare RFID card reader with an integrated relay output that drives the EM lock directly — and that also outputs Wiegand if the resort later upgrades to a central access controller — is the right one-door solution. The eSSL KR503-M is built for exactly this. A Mifare RFID card reader with a relay output that drives EM or strike lock directly, plus Wiegand 26/34 for future controller integration.

Why integrators specify the eSSL KR503-M

The eSSL KR503-M is the Mifare RFID card reader with relay output integrators specify when the deployment is a single high-security door without a separate access controller cabinet — boutique resort back-of-house, single-door pharmacy, single-door BFSI cash room, single-door records archive. The integrated relay output drives the EM lock or strike lock directly, so the card reader plus a 12V DC PSU plus the lock is the entire access control system at that door. Mifare 13.56 MHz support means the encrypted card stock the property issues authenticates correctly. Wiegand 26/34 output is also present, so the same reader works if the property later adds a central access controller. LED and buzzer feedback at the head; tamper alarm wires back to the resort’s central security panel.

RFID technology & read range

The eSSL KR503-M operates on 13.56 MHz Mifare frequency with a read range of 5-10 cm. Mifare 1K and Mifare 4K cards both authenticate, with the card serial number used as the credential identifier. The encrypted Mifare layer is what gives the boutique resort manager confidence that a lost card cannot be quietly cloned and used to wander the back-of-house — security at the card layer is supplemented by the access control system’s credential database, and the relay output enforces the lock decision at the door without going round-trip to a central controller. The 5-10 cm read range works through plastic ID holders and lanyard sleeves.

How it integrates with your access controller

The eSSL KR503-M has both an integrated relay output (drives the EM lock or strike lock directly for standalone single-door use) and a Wiegand 26/34 output (feeds a central access controller for multi-door integration). For the boutique resort back-of-house deployment the relay output is the operational path: the reader holds the credential list, the relay fires on a valid Mifare tap, the EM lock releases. If the resort later adds a central access control system, the same KR503-M card reader switches to feeding Wiegand into the central controller without re-wiring the head — the relay output simply stops being used in favour of the controller’s lock-driver output.

Daily operation

The eSSL KR503-M mounts on the wall beside the back-of-house corridor door. Power is 12V DC drawn from the access control power supply. LED feedback confirms successful Mifare taps; the buzzer gives an audible cue. The relay output drives the EM lock directly. The tamper alarm wires back to the resort’s central security panel for forced-removal events. For a boutique-resort single-door deployment the KR503-M card reader is essentially the entire access control system at that door — no controller cabinet, no separate panel, just reader plus lock plus PSU. Housekeeping wipe-down is sufficient maintenance.

At a glance

• Brand+Model: eSSL KR503-M
• Frequency: 13.56 MHz Mifare
• Card types supported: Mifare 1K, Mifare 4K (CSN read)
• Read range: 5-10 cm
• Communication output: Wiegand 26/34 + integrated relay
• Lock drive: Direct relay output drives EM or strike lock
• Power supply: 12V DC
• Indicators: LED and buzzer feedback
• Security: Tamper detection alarm
• Form factor: Wall-mount beside door frame
• Vendor: eSSL Security
• SKU: KR503-M

What integrators usually ask before ordering

Will it work with our existing access controller?
Yes — Wiegand 26/34 output is the universal access control reader protocol. For standalone single-door use, the integrated relay output drives the lock directly without a controller.

What’s the read range, and does it work through wallets/lanyards?
5-10 cm. Standard lanyards and thin wallets pass through.

Can it read multiple card types (EM + Mifare)?
The KR503-M is Mifare 13.56 MHz only. For dual EM + Mifare, use the eSSL SA40.

Is it IP-rated for outdoor mounting?
The KR503-M is indoor / corridor-rated. For outdoor entries, use the eSSL KR500-E (IP65).

Does it support encrypted cards?
Yes — Mifare 13.56 MHz is the encrypted card platform of choice for hospitality, BFSI and high-trust spaces. The KR503-M card reader reads the Mifare CSN.

Related RFID card readers

• All RFID card readers
• All eSSL attendance & access machines
• All access controllers
• eSSL KR503-E (EM vandal-resistant equivalent)
• eSSL KR500-M (Mifare smart card wall-mount)

Sold by AmpleTrails. Questions on RFID integration, bulk orders or installation? Email [email protected], or call +91 9315441053 / +91 9034757673.