When capturing data from 433 MHz band based networks, the TI CC1111 USB front-end should be used.
Note: Although the standard
TI CC1111 USB dongle includes an internal antenna circuit optimized for 800-900
MHz, it still can be used for capturing 433MHz based data while taking into
consideration a loss of receive sensitivity. Using the TI CC1111 for capturing
433 MHz data results in having a free-space receive range radius of around 10
meters.
If longer capturing range is required, the RF circuit and antenna
should be optimized for the 433 MHz band. This can be done using relevant
reference design from TI (http://www.ti.com/tool/cc1110em433_refdes
and http://www.ti.com/general/docs/litabsmultiplefilelist.tsp?literatureNumber=swra328).
•Data Capture
Figure 417 –Data Capture in 433 MHz bands networks form
The user can choose to manually set
the different capture parameters (Frequency, Whitening, Sync Word, FEC,
Manchester) or to use the pre-defined capture sets (i.e. Channel Class,
SpectrumID, Channel, Class). Manually setting parameters can be done if the
'DASH7 Enhanced Settings:" option in the TI-CC1111 Preferences Tab is selected
(see par. IV.19.13).
Note: When using the
pre-defined capture sets, the TI-CC1111 different parameters will be set
according to values set in the TI-CC1111 Preferences tab (see par. IV.19.13 and http://www.ti.com/lit/ds/symlink/cc1110f32.pdf).
•Channel Class: - choose the Channel Class to use when capturing data form the 'Channel Class:' drop down list:
Figure 418 – Channel Class drop-down list
o Base Channel Class - permits capturing a single channel based on the Base Channel Class definition of the standard
o Legacy Channel Class - permits capturing a single channel based on the Legacy Channel Class definition of the standard
o Normal Channel Class - permits capturing a single out of the eight concurrent channels based on the Normal Base Channel Class definition of the standard
o Hi-Rate Channel Class - permits capturing a single out of the four concurrent channels based on the Hi-Rate Channel Class definition of the standard
o Blink Channel Class - permits capturing a single out of two concurrent channels based on the Base Blink Class definition of the standard
•SpectrumID: - choose the desired SpectrumID from the drop-down list.
•Channel: - choose the desired Channel from the drop-down list
•Class: - choose the desired Class from the drop-down list
Note: The Channel Class, SpectrumID, Channel and Class are defined as sets – i.e. choosing one specific value for one field may change the selection of the others according to the definition in the standard.
Similar to capturing data from 2.4GHz networks, a data capture process will start when pressing the "Start…" button (see chapter IV.11 for details about the different Data Capture Modes).