Transcript DR9031 Wireless Data Acquisition & Control

DR9011/DR9021 Point to Point
Wireless Data Acquisition
System
Copyright © 2008 Wilkerson Instrument Co., Inc All rights reserved
DR9011/DR9021 POINT-TO-POINT
WIRELESS DATA ACQUISITION
DR9011 Transmitter
• A DR9011 Remote Transmitter Can Send Analog and Contact
Status Up to 20 Miles to a DR9021 Receiver
•
Sends Analog and Contact Status Data in One Direction
•
Analog Inputs Available For DC Voltage or DC Current, RTD, or
Bridge. Dual Channel DC – Single Channel RTD or Bridge
•
Four Digital Inputs For Contact Closure or NPN Transistor Status
•
Power 10 – 30VDC
Copyright © 2008 Wilkerson Instrument Co., Inc
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DR9011/DR9021 POINT-TO-POINT
WIRELESS DATA ACQUISITION
DR9011 Transmitter
• Dual DC Voltage or Current Inputs—Individually Isolated
• Dual Channel DC Inputs Can Have Mixed Inputs
• 100 Ohm Platinum RTD Input – 2 or 3 Wire
•
Bridge Input – Built In Precision 10VDC
Excitation For Four 330 Ohm Bridges
Copyright © 2008 Wilkerson Instrument Co., Inc
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DR9011/DR9021 POINT-TO-POINT
WIRELESS DATA ACQUISITION
Typical Interface to Discrete Input
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DR9011/DR9021 POINT-TO-POINT
WIRELESS DATA ACQUISITION
DR9021 Receiver
• Dual 4-20mA Outputs
• Dual DC Inputs Have An Output Proportional to Each Input
• Single Analog Inputs Have Dual 4-20 mA Outputs – Each
Proportional to The Single Input
• Four Optically Isolated NPN Transistor Discrete Outputs
• Power 85 – 230VAC, 12VDC, or 24VDC
Copyright © 2008 Wilkerson Instrument Co., Inc
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DR9011/DR9021 POINT-TO-POINT
WIRELESS DATA ACQUISITION
Two Typical Interfaces to Discrete Output
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DR9011/DR9021 POINT-TO-POINT
WIRELESS DATA ACQUISITION
Typical Relay Interface to Discrete Output
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DR9011/DR9021 POINT-TO-POINT
WIRELESS DATA ACQUISITION
RADIO
Frequencies
915 MHz Band
908 or 922 MHz
2.4 GHz Band
2.4000 - 2.4835 GHz
Range / Line of Sight
915 MHz Band
Up to 20 Mi.
Spread Spectrum Type
Frequency Hopping,
Direct FM
7 Hop Sequences Each
Frequency Band
I/O Data Rate Tx to Rx
9600 bps
2.4 GHz Band
Up to 10 Mi.
Data Update Rate
9/Sec
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Antenna Data
Radio frequency currents flowing in an antenna element
creates a magnetic field around the conductor. This
magnetic field radiates through space and induces a
small current in any conductor it passes.
The small current created in the receiving antenna of
interest is processed by the radio receiver to accomplish
the required task.
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Antenna Data
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Transmit and receive antennas’ elements must be
aligned in the same direction
Antenna gain is stated as gain relative to a reference
antenna
Reference “antenna” is a point (isotropic) source
which radiates in a perfect sphere
Gain is achieved by distorting the perfect sphere to
radiate more in a given direction
The isotropic antenna is assigned a gain of 1
Practical antennas have their gain referenced to the
isotropic source.
Copyright © 2008 Wilkerson Instrument Co., Inc
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Antenna Data
• The gain of an antenna, in a given direction, can be
defined as “for a given input power, the gain of an
antenna is the power radiated by the antenna divided by
the power radiated by an isotropic source.”
• Gain is usually expressed in decibels which is expressed
by Gain = 10log (power radiated by antenna) / (power
radiated by isotropic source). An i indicates gain relative
to an isotropic source (dBi).
• For a gain of 2
10log(2/1) = 10 X 0.3 = 3dBi
• For a gain of 10
10log(10/1) = 10 X 1 = 10dBi
• Antennas are perfectly reciprocal – Gain is the same for
transmitting and receiving.
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Copyright © 2008 Wilkerson Instrument Co., Inc
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915MHz Band Antennas
Short Range Antennas
Small vertical antennas are used for short range communications
7” vertical antenna for indoor
mounting. Mounts by screwing on
SMA bulkhead connector.
Articulated 90 degree joint allows
horizontal or vertical connector to
be used. Line of sight range
about 1000 to 1500 feet.
2.1dBi gain
Vertical omni-directional antenna for
outdoor mounting. Type N female
connector to accept coaxial cable.
Has bracket for mounting on 1 ½”
mast. Line of sight range several
miles.
6dBi and 8.5dBi gain models.
27” and 60” lengths.
2 3/4” vertical antenna for outdoor
mounting. Mounts on a special bulkhead
connector . A bracket is available for
mounting on a flat vertical surface or a
mast. Line of sight range about 1000 to
1500 feet. 2.1 dBi gain
Copyright © 2008 Wilkerson Instrument Co., Inc
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915MHz Band Antennas
Long Range Antennas
Yagi antennas with high gain are used for long range communications.
12 dBi gain 26” length
14 dBi gain
48” length
8 dBi gain 18” length
2 Stacked Yagi
17 dBi gain
48” length
11 dBi gain 21” length
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Antenna Beam Patterns
Vertical beam pattern of a
long range vertical antenna. From
the top it appears as a doughnut.
From the side it has the radiation
pattern shown.
8.5dBi gain 52”
4241
Copyright © 2008 Wilkerson Instrument Co., Inc
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Horizontal beam pattern of a yagi
antenna. Note the insensitivity
from the rear.
11 dBi gain 21” length
4078
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Need More Information!
Complete documentation is available for all Wilkerson Instrument
Co. products at www.sensorad.com and www.wici.com.
Toll Free: 800-234-1343
Phone: 863-647-2000
Fax: 863-644-5318
Email: [email protected]
Wilkerson Instrument Co., Inc.
2915 Parkway Street
Lakeland, FL 33811
Copyright © 2008 Wilkerson Instrument Co., Inc
All rights reserved
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