MSI 4260B, Руководство оператора, Страница: 48 / 64

44 MSI-4260 Port-A-Weigh Operator’s Manual
6.5 Contention and Jamming Considerations
It is important to understand that only one transmitter at a time can be activated within
a reception area. While the transmitted signal consists of encoded digital data, only
one carrier of any frequency can occupy airspace without contention at any given
time. This is not to say that you cannot have multiple remote controls for the
MSI-
4260
, but rather that you can’t use two simultaneously.
The RF Remote Control is a narrow band low power device and does not have the
jamming immunity of the Spread Spectrum Modem used by the
MSI-4260
to
communicate to the Remote Display. Powerful sources of RF energy in the 418MHz
region can jam the remote and prevent it from operating. In this circumstance, trying
either of the two other available RF Remote frequencies (433MHz and 315MHz)
might solve the problem. Before ordering the RF Remote Control option, some effort
to research RF devices used in the immediate area would be useful in avoiding
jamming the control signals.
It is the end users responsibility to confirm that the chosen operating frequency is
legal for use in your location. 418MHz is legal throughout the USA and Canada.
433MHz is legal in Europe. 315MHz is commonly used for Garage Door Openers
and is legal in the USA, but other location legalities have to be investigated.
In spite of the potential for jamming the Remote Control, the receiver is very immune
from false reception due to the 24 bit encoding. Therefore no functions will be
inadvertently executed.
6.6 Battery Replacement
Battery
access
The remote unit utilizes a CR-2032 Button Lithium Cell.
In normal use it will provide 1-2 years of operation.
Access for replacement is accomplished by removing the
battery access cover by pressing down firmly on the label
area and sliding it off. Once the unit is open, remove the
battery by sliding it from beneath the holder. Replace the
cell with the same type while observing the polarity
shown. Once the new battery is installed, both the
transmitter and
MSI-4260
will have to learn new
addresses. Follow both procedures for setting addresses.
The MSI RF Remote has been pre-certified for FCC Part
15 and Industry Canada RSP-100 compliance. The
433.92MHz version has also been tested for CE compliance for use in the European
Union. The 315MHz and 418MHz versions are not legal for use in Europe.