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DR9011/DR9021 Point to Point Wireless Data Acquisition System Copyright © 2008 Wilkerson Instrument Co., Inc All rights reserved
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 DR9011/DR9021 POINT-TO-POINT WIRELESS DATA ACQUISITION Copyright © 2008 Wilkerson Instrument Co., Inc All rights reserved DR9011 Transmitter 2
DR9011/DR9021 POINT-TO-POINT WIRELESS DATA ACQUISITION Dual DC Voltage or Current InputsIndividually 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 All rights reserved DR9011 Transmitter 3
4 Typical Interface to Discrete Input DR9011/DR9021 POINT-TO-POINT WIRELESS DATA ACQUISITION Copyright © 2008 Wilkerson Instrument Co., Inc All rights reserved
DR9011/DR9021 POINT-TO-POINT WIRELESS DATA ACQUISITION 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 All rights reserved DR9021 Receiver 5
6 DR9011/DR9021 POINT-TO-POINT WIRELESS DATA ACQUISITION Two Typical Interfaces to Discrete Output Copyright © 2008 Wilkerson Instrument Co., Inc All rights reserved
7 DR9011/DR9021 POINT-TO-POINT WIRELESS DATA ACQUISITION Typical Relay Interface to Discrete Output Copyright © 2008 Wilkerson Instrument Co., Inc All rights reserved
DR9011/DR9021 POINT-TO-POINT WIRELESS DATA ACQUISITION Frequencies 915 MHz Band 908 or 922 MHz 2.4 GHz Band GHz Spread Spectrum Type Frequency Hopping, Direct FM 7 Hop Sequences Each Frequency Band Range / Line of Sight 915 MHz Band Up to 20 Mi. 2.4 GHz Band Up to 10 Mi. I/O Data Rate Tx to Rx 9600 bps Data Update Rate 9/Sec RADIO Copyright © 2008 Wilkerson Instrument Co., Inc All rights reserved 8
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. Copyright © 2008 Wilkerson Instrument Co., Inc All rights reserved 9
Antenna Data 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 All rights reserved 10
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. Copyright © 2008 Wilkerson Instrument Co., Inc All rights reserve d 11
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 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 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. Copyright © 2008 Wilkerson Instrument Co., Inc All rights reserved 12
915MHz Band Antennas Long Range Antennas Yagi antennas with high gain are used for long range communications. 8 dBi gain 18 length 11 dBi gain 21 length 12 dBi gain 26 length 14 dBi gain 48 length 2 Stacked Yagi 17 dBi gain 48 length Copyright © 2008 Wilkerson Instrument Co., Inc All rights reserved 13
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. Horizontal beam pattern of a yagi antenna. Note the insensitivity from the rear. 8.5dBi gain dBi gain 21 length 4078 Copyright © 2008 Wilkerson Instrument Co., Inc All rights reserved 14
Need More Information! Wilkerson Instrument Co., Inc Parkway Street Lakeland, FL Toll Free: Phone: Fax: Complete documentation is available for all Wilkerson Instrument Co. products at and Copyright © 2008 Wilkerson Instrument Co., Inc All rights reserved 15
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