EVM-915-DTS-BZS Linx Technologies, EVM-915-DTS-BZS Datasheet - Page 13

• Manufacturer Part Number: EVM-915-DTS-BZS
• Description: RF Development Tools 915 MHz Wireless Module DTS Brazil
• Manufacturer: Linx Technologies
• Type: Wi-Fir

Specifications of EVM-915-DTS-BZS

• Rohs: yes
• Product: Evaluation Modules
• Tool Is For Evaluation Of: Wi.232DTSB-R
• Frequency: 915 MHz
• Operating Supply Voltage: 3 V to 3.6 V
• Interface Type: UART
• Factory Pack Quantity: 1

Preliminary Draft
For example, the link budget for a pair of modules in DTS mode at the
maximum data rate and using 3dBi dipole antennas would be:
+11dBm + 3dB – (–100dBm) + 3dB = 117dB
A link budget of 117dB should easily yield a range of ¼ mile or more
outdoors. If the environment is open and the antennas are 8 to 10 feet off
of the ground, the range could be a mile. Indoors, this link budget should
yield a range of several hundred feet.
This is a well-balanced link budget. More than 10dB of the budget is
achieved through transmit power, which will allow good performance
indoors in the presence of multi-path while keeping the overall operating
current low, making the module suitable for primary battery powered
applications such as RFID and automated meter reading.
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Module Configuration
Channel Settings
Figure 17: Channel Settings
The North American and Brazilian versions of the DTS Series module
supports 32 channels (0–31) in DTS mode and 83 channels (1–83) in low
power mode. LP channel 0 is not available in the FCC pre-certified and all
Anatel versions of the module; a value of zero in the channel register will
select channel 1.
For Brazilian versions, DTS channels 12–17 are aliased to channel 18 and
DTS channels 5–11 are aliased to channel 4. Similarly, LP channels 14–29
are aliased to channel 13 and LP channels 30–44 are aliased to channel
45. This is due to the frequency restrictions placed on the 907 to 915MHz
sub-band in Brazil, and limits the number of unique channels to 19 DTS
and 51 LP. All non-aliased channels are compatible with their North
American counterparts.
Transmit and receive channels are set in regTXCHAN (addr 0x4B) and
regRXCHAN (addr 0x4C) respectively. PLEASE NOTE: If you set the
module to have different transmit and receive channels, it will render the
CSMA algorithm ineffective.
When the module is in DTS mode, the channel registers are masked so
that only the lower 6-bits determine the channel.
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Preliminary Draft