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ENG-6
2.4 GHz digital wireless system
2.4 GHz-frequency digital wireless technology, which is the same technology used for wireless LAN,
is used for both the integrated speed/cadence sensor and the heart rate sensor. This technology
practically eliminates interference from external noise and cross-talk with other wireless computer
users, and enables you to store highly reliable data. However, in a very rare occasions, objects and
places may generate strong electromagnetic waves and interference, which may result in incorrect
measurement. The following are potential sources of interference:
Should be especially careful while synchronizing the sensor ID.*
TV, PC, radios, motors/engines, or in cars and trains.•
Railroad crossings and near railway tracks, around television transmitting stations and radar bases.•
Other wireless computers or digitally controlled lights.•
Automatic recognition of the speed sensor ID
The speed sensor has its own ID, and the wristwatch measures in synchronization with the ID. Two
speed sensor IDs can be registered to one wristwatch, which can automatically identify the 2 speed
sensors once their IDs are registered in advance.
As a tire circumference is set to the speed sensor ID, wheel selection by manual operation is no
longer required, which was necessary with conventional units.
The speed sensor currently recognized is indicated with a sensor icon (* or ) on the screen.
Procedure of automatic recognition
When the wristwatch changes to the Clock mode by its power-saving function, and then returns to the Sports
mode, automatic recognition of the speed sensor ID is performed through the following procedure.
The wristwatch searches a sensor signal from the speed sensor ID-1.
1.
When the wristwatch receives a sensor signal from ID-1, it displays sensor icon
2.
on the
screen, and starts measurement.
When the wristwatch cannot receive any sensor signal from ID-1, it searches a sensor signal
from ID-2.
When the wristwatch receives a sensor signal from ID-2, it displays sensor icon
3.
on the
screen, and starts measurement.
When the wristwatch cannot receive any sensor signal from ID-2, it searches a sensor signal
from ID-1 again.
The wristwatch repeats synchronization through the procedure described above even if it fails in
synchronization for some reason, such as communication failure; in such cases however, it takes
time for recognition.
When the wristwatch cannot receive any signal from the speed sensor in 5 minutes, the *
power-saving mode is activated, and the wristwatch changes to the Clock mode.
Switching the ID by manual operation
The speed sensor ID can be forcibly switched by manual operation from “Setting the tire circumfer-
ence” in the Setup mode. Use this operation in the following cases.
When the wristwatch cannot recognize the intended sensor signal, since the 2 registered speed •
sensors are nearby and both are sending a sensor signal.
When you want to switch the speed sensor ID immediately.•
Once you switch the speed sensor ID by manual operation, the wristwatch continues to search *
only the speed sensor ID you switched when returning to the Sports mode. When the wristwatch
cannot receive any sensor signal in 5 minutes, the power-saving mode is activated, and the
wristwatch changes to the Clock mode. The wristwatch searches through the procedure of
automatic recognition when it returns to the Sports mode.
Important