Opticon Sensors Europe BV EE750R Manual Do Utilizador
EE-750 Specifications manual
8
6.2. Radio Specifications
Parameter
Min
Typ
Max
Unit
Remarks
Receiver sensitivity
-97
-89
dBm
Over the entire temp. and
operating voltage range
Nominal output power
-3
4.5
7
dBm
Frequency
2405
2480
MHz
Over the entire temp. and
operating voltage range
Transfer rate
250Kbit/s
RSSI range
100
dB
Signal strength indication
that can be reported to the
base station
6.3. Radio Protocol
Modified 802.15.4 (Physical layer and Media Access Control layer).
6.3.1.
The physical layer
The physical layer (PHY) provides the data transmission service, as well as the interface
to the physical layer management entity, which offers access to every layer management
function and maintains a database of information on related personal area networks.
Thus, the PHY manages the physical RF transceiver and performs channel selection and
energy and signal management functions. It operates on the above mentioned frequency
band. The PHY layer is 100% compliant and is based on direct sequence spread
spectrum (DSSS) technique with a transfer rate of 250 kbit/s.
to the physical layer management entity, which offers access to every layer management
function and maintains a database of information on related personal area networks.
Thus, the PHY manages the physical RF transceiver and performs channel selection and
energy and signal management functions. It operates on the above mentioned frequency
band. The PHY layer is 100% compliant and is based on direct sequence spread
spectrum (DSSS) technique with a transfer rate of 250 kbit/s.
6.3.2.
The medium access control layer
The medium access control (MAC) layer enables the transmission of MAC frames through
the use of the physical channel. Besides the data service, it offers a management
interface and itself manages access to the physical channel. It also controls frame
validation, guarantees time slots and handles node associations. Finally, it offers hook
points for secure services. The EE-750R does not make use of the optional network
beaconing, instead it used a polling mechanism to increase power efficiency. Some
changes are made to the standard to allow for more efficient data frames and better
power efficiency, especially when nodes are not connected to a base station.
the use of the physical channel. Besides the data service, it offers a management
interface and itself manages access to the physical channel. It also controls frame
validation, guarantees time slots and handles node associations. Finally, it offers hook
points for secure services. The EE-750R does not make use of the optional network
beaconing, instead it used a polling mechanism to increase power efficiency. Some
changes are made to the standard to allow for more efficient data frames and better
power efficiency, especially when nodes are not connected to a base station.
6.3.3.
Security
The 802.15.4 standard 128-bit AES encryption is supported. A secure method for key
management is implemented as well. The encryption is optional though and can be
configured via the base station. By default, the radio traffic is unencrypted.
management is implemented as well. The encryption is optional though and can be
configured via the base station. By default, the radio traffic is unencrypted.