eSSL S990 — 125 kHz EM RFID Card Reader (Slim Wall-Mount, Wiegand 26)

Description

A Bengaluru biotech lab’s integrator needs Wiegand-compatible RFID readers at the cleanroom entry without proprietary controller lock-in — the access control panel the IT team specced is a generic Wiegand controller, and the lab director does not want a reader brand that only talks to one controller manufacturer’s firmware. Cleanroom protocol means a slim, easy-to-wipe reader head that does not collect dust on edges, and the cardholder must be able to tap with gloves on. Read range needs to be tight enough that a card in a wallet does not trigger a false read as someone walks past. The eSSL S990 is built for exactly this. A slim 125 kHz EM RFID card reader with Wiegand 26 output — universal protocol, low-profile housing, 5-10 cm tap-and-go read.

Why integrators specify the eSSL S990

The eSSL S990 is the RFID card reader integrators specify when the spec sheet calls for slim, neutral, vendor-agnostic Wiegand readers at the door. The low-profile housing fits next to a door frame without intruding on the cleanroom finish or the architectural intent of a corporate lobby. Wiegand 26 output is the lowest-common-denominator access control protocol — every mainstream controller accepts it, so the lab is not locked to a single reader-controller brand pairing. 125 kHz EM frequency keeps the per-card cost low for staff lanyard cards, while still giving the security team an auditable credential per cardholder. LED and buzzer feedback confirm successful card reads, and tamper detection flags any forced removal.

RFID technology & read range

The eSSL S990 operates on 125 kHz EM frequency with a read range of 5-10 cm — close enough that a deliberate tap is required, far enough that a glove or a thin wallet does not break the read. EM 125 kHz is the most widely deployed RFID card standard in Indian access control, with cheap blank card stock available from every distributor, which keeps card replacement costs low when staff lose lanyards. The read range works through plastic cardholders, ID lanyard sleeves and standard glove materials, so cleanroom staff do not have to break protocol to authenticate. The eSSL S990 card reader does not pretend to do Mifare; it is a focused, predictable EM-only RFID card reader.

How it integrates with your access controller

The eSSL S990 RFID reader outputs Wiegand 26, the universal access controller reader protocol. It plugs directly into any eSSL, BioMax, ZKTeco or third-party Wiegand panel — no protocol converter, no proprietary cable, no software install. A standard 4-core reader cable carries 12V DC power, ground and the two Wiegand data lines. The access controller manages credentials, time-zone schedules and anti-passback rules; the S990 is a sensor that converts EM card taps into Wiegand strings. Because the access control system holds the credential database, swapping the reader from one controller brand to another is a wire change and a re-enrolment of the wall-side tamper alarm.

Daily operation

The eSSL S990 mounts beside the door frame in a slim wall-mount footprint. Power is 12V DC, drawn from the access controller’s reader power supply over the standard reader cable. LED indicates successful or denied reads; buzzer gives an audible cue. The tamper alarm wires back to the controller input so the security operator sees a forced-removal event without staffing the door. The slim profile is purposeful for cleanrooms and labs where every surface has to be wipeable, and for corporate lobbies where the reader is expected to be unobtrusive. The card reader has no display and no menu; access control logic lives in the controller.

At a glance

• Brand+Model: eSSL S990
• Frequency: 125 kHz EM
• Card types supported: EM proximity cards (standard EM4100 / TK4100 stock)
• Read range: 5-10 cm
• Communication output: Wiegand 26
• Power supply: 12V DC
• Indicators: LED and buzzer feedback
• Security: Tamper detection alarm
• Form factor: Slim low-profile wall-mount
• Vendor: eSSL Security
• SKU: S990

What integrators usually ask before ordering

Will it work with our existing access controller?
Yes — Wiegand 26 is the universal access control reader protocol. The eSSL S990 plugs into any standard Wiegand controller without protocol conversion.

What’s the read range, and does it work through wallets/lanyards?
Read range is 5-10 cm. Standard ID lanyard sleeves and thin wallets pass through; thick wallets with foil-blocking liners will need the card pulled out.

Can it read multiple card types (EM + Mifare)?
No — the S990 is a 125 kHz EM-only RFID card reader. For mixed EM + Mifare estates, use the eSSL SA40 (dual-frequency).

Is it IP-rated for outdoor mounting?
The S990 is rated for indoor and semi-sheltered installation. For outdoor gates, use the eSSL KR500-E (IP65) instead.

Does it support encrypted cards?
EM 125 kHz does not implement card-side encryption; the access control system enforces security at the controller layer. For encrypted credentials, choose a 13.56 MHz Mifare RFID card reader such as the eSSL SC-405.

Related RFID card readers

• All RFID card readers
• All eSSL attendance & access machines
• All access controllers
• eSSL SA40 (dual EM + Mifare)
• eSSL SC-405 (Mifare slim turnstile)

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