6
This wireless transmitter contains a low power transmitter.
This wireless transmitter contains a low power transmitter.
This wireless transmitter contains a low power transmitter.
This wireless transmitter contains a low power transmitter. When in transmit it sen
When in transmit it sen
When in transmit it sen
When in transmit it sends
ds
ds
ds
out radio frequ
out radio frequ
out radio frequ
out radio frequency (RF) energy.
ency (RF) energy.
ency (RF) energy.
ency (RF) energy. In August 1996 the Federal Communications
In August 1996 the Federal Communications
In August 1996 the Federal Communications
In August 1996 the Federal Communications
Commi
Commi
Commi
Commission
ssion
ssion
ssion (FCC) adopted RF
(FCC) adopted RF
(FCC) adopted RF
(FCC) adopted RF exposure safety guidelines.
exposure safety guidelines.
exposure safety guidelines.
exposure safety guidelines. To maintain compliance
To maintain compliance
To maintain compliance
To maintain compliance
with the
with the
with the
with the FCC
FCC
FCC
FCC’’’’ssss RF safety exposure guideli
RF safety exposure guideli
RF safety exposure guideli
RF safety exposure guideline
ne
ne
nessss it is recommended that you remain 2
it is recommended that you remain 2
it is recommended that you remain 2
it is recommended that you remain 2
inches (5 centimeters)
inches (5 centimeters)
inches (5 centimeters)
inches (5 centimeters) away from the antenna
away from the antenna
away from the antenna
away from the antenna while the unit is transmitting.
while the unit is transmitting.
while the unit is transmitting.
while the unit is transmitting. The
The
The
The
D900ss
D900ss
D900ss
D900ss----20
20
20
20 Demo Kit
Demo Kit
Demo Kit
Demo Kit comes supplied with a permanently
comes supplied with a permanently
comes supplied with a permanently
comes supplied with a permanently attached antenna.
attached antenna.
attached antenna.
attached antenna.
Modifications or attachments
Modifications or attachments
Modifications or attachments
Modifications or attachments could damage the transmitter, alter the RF exposure
could damage the transmitter, alter the RF exposure
could damage the transmitter, alter the RF exposure
could damage the transmitter, alter the RF exposure, and
, and
, and
, and
may violate FCC
may violate FCC
may violate FCC
may violate FCC regulations.
regulations.
regulations.
regulations.
Chapter 2. Module introduction
2.1. Description
The B900ss-20 is an FM radio transceiver with frequency hopping using an F.S.K
modulation. The receiver is of a super beat oscillator type with heterodyning. It
operates on the 902-928 MHz band and, therefore, is within U.S. FCC part 15.247
standard.
Using the frequency synthesis, it has a maximum of 50 channels spaced by 150 kHz and
can communicate with equipment via a serial interface with RS-232 standard and TTL
levels.
The serial link is completely programmable from 2400 up to 38400 Baud. The radio rate
is established at 40 KBits/s.
The B900ss-20 uses the most recent technology of flash memory micro controller, which
allows the user to update or to load new features through the serial link.
Many parameters are programmable through the serial link and the default
configuration is memorized in an EEPROM (ROM).
At each activation, the radio modem component is programmed with its configuration
parameters (Channel, Speed, Protocol, etc.).
The default data are: RS-232 connection at 19,200 Baud, 8 bits, 1 stop bit, no parity,
Frequency Table 1, slave modem.
All these parameters are accessible and modifiable with HAYES or AT commands.
