Opticon Sensors Europe BV EE420R Manual Do Utilizador
EE-420
Rev. 2
4
SPECIFICATIONS MANUAL
Radio Specifications
Parameter
Min
Typ
Max
Unit
Remarks
Receiver sensitivity
-97
-89
dBm
Over the entire temperature and
operating voltage range
Nominal output power
-3
4.5
7
dBm
Frequency
2405
2480
MHz
Over the entire temperature and
operating voltage range
Transfer rate
250
Kbit/s
RSSI range
100
dB
Signal strength indication that can be
reported to the base station
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.
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-420R 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.
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-420R 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.
implemented as well. The encryption is optional though and can be configured via the base station. By default, the
radio traffic is unencrypted.