BECKWITH ELECTRIC BlueJay M-2911 Інструкція з експлуатації - Сторінка 3
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Друкувати сторінкуThe M-2911 BlueJay
™
Wireless Data Transceiver is a self-contained short-range wireless communication
device (SRD) that is used for transferring serial communication data between Intelligent Electrical Devices
(IEDs) and computers hosting control software in an industrial environment. The M-2911 is based on an
Intersil direct sequence spread spectrum chip set that operates in the 2.4 GHz ISM band. The M-2911 design
meets the category for low power devices (LPDs) standard requirement for license-free operation.
Interface
The M-2911 is equipped with two serial data connectors, one is a DE-9 connector for use with an RS-232
serial data port and the other is a 6-pin bare wire Phoenix–type connector for use with an RS-422/RS-485
(twisted shielded pair) serial data ports. Only one port can be used at a time. Each port is capable of serial
data speeds of up to 115 kbps.
Data Transmission:
• Error Detection – 16 bit CRC (10
• Maximum throughput – 1 Mbps RF, 300 to 115.2 Kbps interface baud rate
Communication
The M-2911 conditions the data and transmits it over a half-duplex direct sequence spread spectrum radio
operating in the 2.4 GHz ISM band. The over-the-air data rate is 1 Mbps.
Transmit:
• Frequency Range – 2400 MHz to 2483.5 MHz
• Output Power – 30 mW
• Modulation – DBPSK
• Occupied Bandwidth – 20 MHz
• Spurious Emissions – 50 mV/meter
• Harmonic Emissions – 500 uV/meter
• Spreading Method – Direct Sequence 11 bit code
• Center Band – Carrier 2.450 GHz
Receive:
• Sensitivity – -93 dBm
• Selectivity – 25 MHz
The M-2911 BlueJay Wireless Data Transceiver must be used with a cable extension if the M-2911 is
mounted inside a metal enclosure. Antennas must be oriented in the same plane and located in view of the
corresponding M-2911. Beckwith Electric antenna and cable accessories are listed below.
■ NOTE: For maximum range, all antennas must be oriented in the same plane.
Accessories
M-2924-4R – 4 foot cable extension for provided antenna (1/4 wave dipole)
M-2924-4S – 4 foot cable extension for optional antennas
■ NOTE: Both optional antennae will require the M-2924-4S at a minimum.
M-2924-10 – 10 foot cable extension for optional antennas
M-2924-25 – 25 foot cable extension for optional antennas
421-00228 – 9 dB Omni-directional outdoor antenna
M-2911 BlueJay Wireless Data Transceiver
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BER at –70dBm)
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