User's Manual

Preliminary
Dynastream Innovations Inc.
Company Confidential
TITLE: FIT1/e USER MANUAL Rev 0.A
DOCUMENT NO: D00001279 SHEET: 4 of 9
The FIT1 is a RF-only module, which operates on the 2.4 GHz license-free band and is capable of bidirectional
communication. The FIT1e includes the FIT1 functionality but also incorporates an electromagnetic (EM)
receiver coil that is capable of receiving 5 kHz inductive pulses from legacy HRM transmitters. The intention is
for either module to be pre-certified as intentional transmitters, providing customers with ease of integration and
reduced time to market. This document reviews the operational characteristics, applicable markings, labels and
warning required for the various regulatory jurisdictions.
3 FIT1/E OPERATION
3.1 Proximity Linking
Pairing between FIT1/e and compatible RF-based HRMs and watches is accomplished through a process called
‘proximity linking’, which discriminates against non-proximal devices using received signal strength indication
(RSSI). In practice, proximity linking is performed by having the user bring the RF device close to the fitness
console, where the FIT1/e module is located. Once linked, the devices maintain communication within a much
larger tracking zone. If an EM-based HRM is being used, then the pairing process is not applicable.
Figure 1 – FIT1/e Proximity Linking Process