← Solutions Solution · Assistive Help Call for Care, Healthcare & Schools

One press to call for help. No wires, no batteries.

A battery-free button goes wherever someone may need help — beside a bed, in a bathroom, in a classroom. Next to it, EnOcean STM 550B and EMDCB sensors report temperature, humidity, presence and light, calibrated at the factory. One BFi53ER0 EdgeRouter hands all of it to the nurse-call, security or building system you already run — and it is set up from a web page, with every call and reading visible in the browser the moment it is heard.

Product combinationBFi53ER0-BF EdgeRouter + BFi5EWS call buttons + STM 550B / EMDCB sensors

Assistive — it supplements a certified nurse-call system; it does not replace one.

Tell us about the site → The battery-free Bluetooth gateway

Senior-living lounge — Long-term care *· residents’ rooms*

Hospital room — Hospitals & clinics *· wards*

Kindergarten playroom — Kindergartens & schools

Where it helps

Beside the bed, in the ward, in the classroom.

Long-term care

Residents’ rooms and bathrooms

A button beside the bed and in the bathroom, with no cable through a finished wall and no battery that may be flat on the night it matters
Room temperature and humidity watched for residents who cannot say they are too cold or too hot
Presence tells the carer answering a call whether the resident is still in the room

Healthcare

Wards, clinics and waiting areas

Extra call points added without opening walls, in a building that cannot close for works
Temperature and humidity of rooms and storerooms, alongside the building’s other points
Occupancy for toilets and consulting rooms, with no camera and no microphone

Children & public places

Kindergartens, schools, restrooms, parking

Help buttons in toilets, corridors, nursing rooms and on parking columns, placed where a child can reach
Classroom climate and daylight checked without a single battery to change across the building
Nothing to plug in and no battery compartment to open: sensors powered by light, buttons by the press

Call buttons for lone workers on production lines and in equipment rooms are part of Factories & Infrastructure →

What goes on the wall

Three battery-free devices, nothing to calibrate on site.

The button is powered by the press; the sensors by room light. EnOcean calibrates the sensors at the factory and stores the values inside them, so there is no calibration visit and no battery round.

BANFi BFi5EWS single- and double-rocker battery-free switches

Call for help

Battery-free button

A BANFi BFi5EWS switch or an EnOcean kinetic switch; the press itself powers the call
Stuck or screwed on where it is needed, at any height — including where a child or a seated person can reach
Every press and release is authenticated and numbered, so a missed telegram shows up as a gap rather than silence

Room climate · factory-calibrated

EnOcean STM 550B

Temperature ±0.3 K and humidity ±3 % r.h. per EnOcean
Too hot, too cold or too damp flagged for people who cannot say so themselves
Magnet contact for a window or door left open; acceleration if the sensor is moved

Presence & light · factory-calibrated

EnOcean EMDCB

Occupancy of a room, a stall or a bay, from the ceiling
Light level from a factory-calibrated solar cell, ±5 % at full scale per EnOcean
Beside a call, it tells staff whether someone is still there — with no camera and no microphone

Full sensor specifications ↓

Set up in a browser

Set up from a web page. See every call as it happens.

No commissioning tool and no software on a PC: the gateway serves its own pages. Stick the buttons and sensors up, open a browser, and each one appears the first time it is pressed or reports.

Set up from a web pageOpen http://bfi53er0-xxxx.local/ on a laptop or phone on the same network. No app, no server, no software to install — and no internet or router needed to get started.

Calls and sensors, straight to the screenEach button and sensor gets its own card. A press lights the contact pressed the moment the gateway hears it; temperature, humidity, presence and a door left open sit beside it, with signal strength and any telegrams missed.

Named by room, in a few clicksGive each device a name and a place — “Room 203, bedside” — choose where calls are forwarded, and back the settings up to a file for the next gateway.

Live view: a card for each battery-free switch and sensor, with the contact last pressed, readings, signal strength and sequence number — The live view: each button shows the contact last pressed; the sensors show their readings, signal strength and sequence number.

Settings overview: devices heard, telegrams, forwarding and the status of network, recorder, TCP feed, Bluetooth and firmware — The settings page, behind a password: what the gateway hears, where it sends it, and the state of every part.

How it connects

One gateway, one building system.

The call, the room climate and presence arrive together, so one screen, one alarm list and one escalation path cover all of them.

On the wall

Battery-free buttons, STM 550B and EMDCB. Bluetooth LE, all three advertising channels.

→

BFi53ER0 EdgeRouter

PoE, DIN rail or wall. -BF: JSON over UDP / TCP and Modbus TCP, IPv4 and IPv6; a button press can drive a 24 V digital output to a strobe or a sounder at the door directly, and a rule can flag a room sensor that has not reported for a set time (rules) — not a call button, which sends only when pressed. -MB: Modbus TCP, and the 24 V digital outputs can drive a strobe or a sounder at the door.

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Your system

Nurse-call, security, the front desk, a BMS or a dashboard — whatever already takes Modbus TCP or JSON over IP.

Need CO₂ and VOC as well? Add a BFi91XTD node with an environmental sensor (temperature, humidity, pressure, air quality); it reports over DECT NR+, and a BFi53ER0S brings it into the same building system as Modbus TCP. Gateway details: Battery-free Bluetooth gateway · Modbus TCP & Bluetooth Mesh.

The gateway

BFi53ER0 EdgeRouter.

One PoE cable for power and data, on a DIN rail or on the wall — in a riser, a nurses’ station cabinet or above a ceiling.

BFi53ER0 dimension drawing: 119.6 by 110.0 by 37.4 mm body, in millimetres — Dimensions in mm. Body 119.6 × 110.0 × 37.4 mm.

PowerPoE+ (IEEE 802.3at) or 14–32 V DC

MountingDIN rail or wall; extruded aluminium

RadioBluetooth 5.3 LE with front end; external antenna on SMA

Network10/100 Ethernet, IPv4 and IPv6

Field I/OBFi53ER0 terminal block: 4 × 24 V digital out, 2 × digital in, RS-485, 2 × 0–10 V in and out. BFi53ER0S: terminal assignment to be announced.

RecordmicroSD ring recorder for the most recent history (-BF firmware)

UpdatesSigned firmware from the settings page, a phone over Bluetooth, or a microSD card (firmware 0.57.46): copy the signed image to the card and restart. Newer versions only; the file is checked before anything is erased, and a trial run rolls back automatically if the new image is not kept

Hardware page · Hardware specification v2.9 (PDF)

Sensor specifications

Accuracy and parameters, as EnOcean states them.

Both sensors are calibrated at EnOcean’s factory and keep the values inside the device. The figures below are EnOcean’s specification values, not a site guarantee; mounting height and position still matter.

EnOcean STM 550B multisensor

Temperature	±0.3 K over the operating range; ±0.2 K in the typical indoor range. Measurement range −25 to +65 °C
Humidity	±3 % r.h.; ±2 % r.h. in the typical indoor range. 0 to 100 % r.h.
Illuminance	±10 %, 0 to 65 000 lx; measured with the calibrated solar cell by default since product revision DB (2024)
Acceleration	±4 g range, 0.002 g resolution; a movement above 0.03 g (configurable) reports at once
Magnet contact	Open or closed, for a door or window
Calibration	Factory; values held in a non-accessible area of the device
Report interval	Every 120 s by default since revision DB (60 s before), configurable via NFC
Operating conditions	−5 to +45 °C, 0 to 90 % r.h. non-condensing; indoor, dry rooms only
Power	Solar cell: 200 lx for 6 h a day; 4 days in darkness after a full charge; optional CR1632 backup
Radio	Bluetooth LE advertising, channels 37/38/39, +4 dBm; typ. 30 m line of sight, 10 m indoors
Security	AES-128 (CBC) authentication with sequence counter
Size	Module 40 × 40 × 13 mm; with frame (EMSIB) 49 × 49 × 13 mm

EnOcean EMDCB presence & light sensor

Motion	PIR; detection radius up to 5 m when mounted 3 m high (ceiling, 2.5–3 m recommended). First motion reported at once; sensitivity switch
Illuminance	±5 % at full scale, 0 to 65 000 lx, 1 lx resolution
Calibration	Solar cell calibrated at the factory for universal use; light on a desk surface still needs calibrating at the receiver
Report interval	About every 1 min with motion, every 2 min without; configurable via NFC
Operating conditions	0 to 60 °C (0 to 30 °C recommended), 20 to 85 % r.h. non-condensing; indoor only
PIR note	The room must be clearly colder than the body (36.5 °C) for motion to be detected
Power	Solar cell: 200 lx for 6 h a day; up to 14 days in darkness after a full charge; optional CR2032 backup
Radio	Bluetooth LE advertising, channels 37/38/39, +4 dBm (0 dBm selectable); 75 m ideal line of sight, 10 m indoors
Security	AES-128 (CBC) authentication with sequence counter
Size	113.2 × 65.5 × 30.7 mm
Approvals	CE / RED, FCC, ISED, ARIB (EnOcean)

Sources: EnOcean STM 550B user manual v1.5 (March 2023), datasheet (July 2022) and product change notice for revision DB (July 2024); EnOcean EMDCB user manual v1.8 (June 2021) and datasheet (June 2019). Where a datasheet and the later user manual differ, the user manual’s value is shown. Radio range is EnOcean’s guidance; button to gateway: within one room, up to 15 m line of sight (guidance only, per the radio module’s specification).

Before you plan

Assistive, not certified. This is an application built from standard products, not a certified nurse-call or life-safety system; where regulations require one, it supplements that system rather than replacing it, and it never replaces fire alarms. The browser live view is for set-up and at-a-glance checks; calls that must reach staff are routed to the nurse-call, security or building system. The sensors and buttons are rated for indoor use; the STM 550B for dry rooms at −5 to +45 °C. Calibration and accuracy figures are EnOcean’s specification values, not a site guarantee; mounting height and position still matter. Button-to-gateway distance: within one room, up to 15 m line of sight (guidance only, per the radio module’s specification); survey each installation.

Calibration and accuracy: EnOcean STM 550B user manual v1.5 (2023) and EMDCB user manual v1.8 (2021). EnOcean, STM and PTM are trademarks of EnOcean GmbH; Bluetooth is a trademark of Bluetooth SIG, Inc. Device photos: EnOcean GmbH and BANFi; scene photos: Unsplash.