Intelligent Tag Range

Location Reporting & Secure Bi-directional Data Transfer

Introducing the i-Tag Range

Large, heavy-industrial organisations (e.g. Military and Aerospace, Rail, Oil & Gas) operate large-footprint, complex, indoor/outdoor sites with many thousands of mobile, high-value, high-integrity assets (people, tools, equipment, materials) that need to be managed and located over their lifetime to; maintain budgetary control, reduce theft/loss, remain safety-compliant, and increase operational efficiency.

Intelligent tags support greater process integration into business operations, offering greater value-add, especially in strict compliance, safety-critical environments. No more lost, damaged or uncalibrated equipment.

iTag messaging also provides a direct 2-way message interface to the tag/operative via application-driven process-rules (e.g., return this tool for calibration) or autonomously via environmental/location-based parameters (e.g. this device is not allowed outside these boundaries), further adding value especially in safety critical environments.


i-Tag (Standard)

Installation Block


i-Tag (EPD)

Flex i-Tag

Three-Tier Tag Architecture

An early design decision was taken to separate the sensor electronics from the radio electronics as shown in the Flex i-Tag PCB Stack-up image below. The sensors are mounted on a small PCB which is hard mounted onto the casework, a second PCB carries batteries; and the CPU, radios and location electronics are mounted on a third PCB.

This approach allows multiple sensor solutions to be developed without altering the radio PCB (which is subject to compliance controls). Using the separate sensor board supports further (and parallel) development of more sophisticated sensors without disturbing the sensitive radio electronics, as well as offering more effective mounting options for sensor related electronics.

Flex i-Tag PCB Stack-up

Location Services using i-Tags

Location services are possible via four different approaches:

  • Outdoor GNSS tracking: works globally as an outdoor service. Location is relayed via one of the LoRa networks, or stored locally to be uploaded once the tag is within range of a backhaul network.
  • Site-wide LoRa-2.4: accurate (up to 2m) tracking of indoor and outdoor spaces in 3-dimensions using a network of fixed-point anchors to determine point in space location.
  • Short-range finder: Typically combined with a sparse LoRa-2.4 anchor network to provide a rough device location (within 10m). Final location is determined using a conventional mobile ‘finder’ device (running Convert’s finder app) detecting BLE signals transmitted by the tag.
  • Proximity location: Uses short range beaconing (using FLRC signalling) to determine proximity to a single fixed source, useful for providing building/bunker location.


A flexible approach to location management allows effective balancing of accuracy, infrastructure, and cost, which may change in different environments or applications. For instance, reporting location through a manufacturing facility will have very different requirements compared to reporting the location of a largely static asset in a secure bunker .

Power Delivery

Feedback from our clients has largely been centred around understanding one of their key system criteria; the importance of power requirements, as part of the design considerations of the Intelligent Tags. During the requirements phase, Convert include a power budget spreadsheet which details power requirements of onboard sensors, data transport networks, and location features, to provide accurate guidance against battery choice, size and expected operating life.

The current design provides tag power via two replaceable AA cells. However, Convert have experience using rechargeable solutions, also incorporating inductive charging if required.


The entire Location/IoT ecosystem is protected via strong security protocols originally developed to support the LoRaWAN standard operating at sub-Gig frequencies. Devices connect to the network via authenticated Over-The-Air Activation (OTAA), and communicate via secure, encrypted channels. All encryption is generated via 128-bit AES key exchange. See link below for further details…

lorawan_security_whitepaper.pdf (

Use Cases

Top uses cases where intelligent asset tags (i-Tags) benefit organisations in the Rail, Military & Aerospace, and Healthcare Logistics sectors will include:



  • ‘Static’ and ‘Dynamic’ ranging capability
  • Data logging of location & sensor data
  • Geofencing capability (Int/Ext)
  • Automated customised messages sent to tags/operatives in the field e.g.
    • Calibration status
    • Return to Calibration store
    • Do Not Use this tool
    • Unsafe to use in this zone
  • Once written, messages persist, even if tag battery goes flat
  • Pre-loaded messages can be stored & generated by the tag itself
  • Ease of Installation
  • Configurable to client databases
  • No cloud subscription charges
  • Smart supply chain/logstics
  • Lone worker applications