RDF-IoTTag-LW SIM V4 — Lone Worker Tracking Device
A lone worker should not disappear on site. RDF-IoTTag-LW SIM V4 sends fall, inactivity and panic alarms over the cellular network immediately.
RDF-IoTTag-LW SIM V4 is an industrial lone worker tracking device worn on the belt. It connects over a SIM card on LTE Cat M1 / NB2 and reports position with GNSS. A 1.28" color round LCD, a diagnostic LED and a charge LED show status to the operator. Charging is via USB-C.
The essential protection functions are automatic man-down detection on a fall, inactivity, a panic button for emergency alarm, and location reporting with GNSS. On isolated sites, shifts and maintenance jobs, lone worker safety starts with an alarm that is not late. For lone worker personnel tracking, the safety team sees both the event type and the worker’s location in the same alert.
Core Protection Architecture
Panic and automatic alarm
Manual alarm from the panic button. Automatic alarm on fall and inactivity; alarm type can be classified in the interface.
GNSS positioning
The worker’s location is reported by GNSS in an emergency. Accuracy depends on the environment; about 1 metre is the open-sky target.
LTE Cat M1 / NB2 + SIM
Low-power cellular IoT link. Alarm and position are sent from sites with cellular coverage via the SIM card.
Wearable housing
Clips to the belt. 1.28" color round LCD, diagnostic LED and charge LED. USB-C charging.
Technical Specifications
| Component | Specification |
|---|---|
| Connectivity | SIM card, LTE Cat M1 / NB2 |
| Positioning | GNSS |
| Display | 1.28" color round LCD |
| Indicators | Diagnostic LED, charge status LED |
| Charging | USB-C |
| Wear | Belt clip, worn on the belt |
| Alarms | Panic button, man-down, inactivity |
| Use | Industrial lone worker tracking and personnel safety |
| Battery life | About 12–17 hours. About 12 hours with frequent reporting and no sleep; up to 17 hours with infrequent reporting and GNSS off |
Where Lone Worker Safety Is Required
Lone workers are operators who perform their activities away from other workers or managers, without close supervision. Lone worker personnel tracking is critical in these areas.
Construction and mining
Fall and inactivity alarms on construction sites, in mines and in restricted areas.
Refinery and maintenance
Panic and location alerts in oil refineries and during maintenance or repair work.
Security patrol
Continuous tracking of security guards on patrol and in lone-working areas.
Benefits
- The worker can send an emergency signal with the panic button.
- An automatic alarm is raised on a fall or man-down event.
- An alarm is sent when the inactivity threshold is exceeded.
- Alarm type (inactivity, fall, panic) can be distinguished in the interface.
- Location is reported by GNSS in an emergency. Accuracy depends on site conditions.
- A wearable, field-rechargeable personnel tracking device for lone worker safety procedures.
Battery Life and Communication Cycle
With the latest device firmware, the RDF-IoTTag-LW SIM V4 runs for about 12 to 17 hours on a full charge. This range is runtime, not charging time. It depends on how often data is sent, whether the device sleeps, and whether the GNSS window is enabled.
Frequent reporting, sleep off — about 12 hours
If packets go out often and the device never sleeps, the radio and processor stay awake. In this regime, battery life is about 12 hours. Use it when location must be refreshed frequently during a shift.
Infrequent reporting, GNSS off, sleep off — up to 17 hours
If the packet interval is longer, the device sleeps between windows, and GNSS stays off, consumption drops. Battery life then reaches up to 17 hours. Suitable for patrols where a fix is not required on every cycle.
Alarm behavior does not depend on the regime. Panic, fall, and no-motion events are still sent wherever they occur in the cycle. The windows below only control periodic location and status packets.
Example communication cycle 1 — data reporting and GNSS
The device sends data on the configured schedule, updates its position with GNSS, then returns to the send window. In the example below, Send Packet After is 10 seconds and Send Packet Window is 50 seconds: five packets leave at 10, 20, 30, 40, and 50 seconds. A GNSS Window then opens (10 seconds in the example), the position is fixed again, and a new send cycle starts.
Example communication cycle 2 — data reporting only
If GNSS is not required, the cycle has no GNSS window. In the example below the window is 180 seconds and the packet interval is 90 seconds: two packets per window, then the same window repeats. With GNSS off and infrequent reporting, runtime approaches the upper end of the range.
Operating regime can be changed remotely
Users change the operating regime from the web interface without calling the device back from the field. Sleep duration, whether the device sleeps, packet interval, send window, and GNSS behavior are all written from the same settings screen. After save, the device applies the new values on the next connection.
| Setting | What it does |
|---|---|
| Sleep after (seconds) | How long the device waits after the send window before entering sleep. Example: 600 seconds. |
| Sleep enable (1/0) | Turns sleep on or off. 1 is on, 0 is off. If off, the device does not sleep between cycles and battery life drops to about 12 hours. |
| Send packet after seconds | Interval between two packets inside the window. 10 seconds in example 1, 90 seconds in example 2. |
| Send packet window | Total length of the data reporting window. Packet count is the window divided by the packet interval. |
| GNSS window | Time reserved to fix the position again. Example: 420 seconds. If GNSS is disabled, this window is not part of the cycle. |
| GNSS hold | Extra time GNSS stays on after a valid fix. Example: 10 seconds. |
| GNSS enable (1/0) | Turns the position window on or off. 1 is on, 0 is off. With GNSS off and infrequent reporting, battery life reaches up to 17 hours. |
Send packet after, send packet window, GNSS window, and the number of transmissions can be changed from the web interface. For frequent location updates, keep the window short and GNSS on. To last through a shift before charging, enable sleep, lengthen the packet interval, and turn GNSS off if it is not needed.
Package Contents
- RDF-IoTTag-LW SIM V4 lone worker tracking device
- Belt clip
- USB-C charging cable
- User and alarm configuration documentation
Documentation
