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Campbell RTMS SYSTEMS Instruction Manual

Summary of RTMS SYSTEMS

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    Rf for rtms systems instruction manual revision: 3/95 copyright (c) 1995 campbell scientific, inc..

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    Warranty and assistance the rf for rtms systems are warranted by campbell scientific, inc. To be free from defects in materials and workmanship under normal use and service for twelve (12) months from date of shipment unless specified otherwise. Batteries have no warranty. Campbell scientific, inc.'...

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    I rf for rtms systems table of contents page section 1. General radiotelemetry network 1.1 introduction............................................................................................................................. 1-1 1.2 field station.....................................................

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    1-1 section 1. General radiotelemetry network 1.1 introduction data retrieval from a remote site can be difficult. To accomplish data collection from isolated sites campbell scientific, inc. Utilizes a radiotelemetry network. Dataloggers can be accessed by radiotelemetry which requires no physical c...

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    Section 1. General radiotelemetry network 1-2 1.2 field station purpose: the field station is where the measurements are made. The campbell scientific datalogger resides at this station taking the desired measurements. Any field station can also operate as a repeater. The only requirement is that th...

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    Section 1. General radiotelemetry network 1-3 1.3 base station purpose: a base station utilizes a computer to collect data from the field station(s). Normally, all communication to the field stations originate at the base station. Data retrieval, remote programming, and system analysis can all be do...

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    Section 1. General radiotelemetry network 1-4 1.4 repeater purpose: to act as relay between two communicating stations separated by too long of a distance or an obstacle which impedes direct communication. A repeater is not always required in a radiotelemetry network. A field station can also functi...

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    2-1 section 2. Assembling the radiotelemetry network this section provides a logical order for rf network assembly and deployment. Details of specific components in the system are described in section 3 “radiotelemetry network components.” this component section is cross-referenced throughout this a...

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    Section 2. Assembling the radiotelemetry network 2-2 when a valid network description containing remote sites is “made active” attempts to communication with the various remote sites will begin. It is often convenient to test the individual field/repeater first and add them to the network descriptio...

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    Section 2. Assembling the radiotelemetry network 2-3 1. Tripod or tower 2. Enclosure and datalogger - turn on datalogger. 3. Antenna - orient correctly; remember direction and polarization. 4. Solar panel 5. Power supply 6. Sensors 7. Rf modem - set the station id according to the map. 8. Radio - ma...

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    Section 2. Assembling the radiotelemetry network 2-4 1. Rf modem's id matches id in the rf path. 2. Field station's radio and datalogger have sufficient power. 3. Radio is connected to rf modem. 4. Rf modem is the only thing connected to datalogger's 9-pin connector. 2.6 adding stations to the net d...

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    Section 2. Assembling the radiotelemetry network 2-5 second quality record would apply to how well the repeater received from the remote, and the third record would apply to how well the base received from the repeater. A "quality record" is made up of five values as follows: first value test packet...

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    3-1 section 3. Radiotelemetry network components 3.1 the rf95t modem as with the cr10 and cr10t datalogger, there are enough changes to the rf modems to warrant a new model name hence the rf95t and the rf232t. The rf95t and the rf232t differ from the rf95 and rf232 in the following respects: • the “...

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    Section 3. Radiotelemetry network components 3-2 3.1.2 rf95t states the ninth switch should be set in the rf95t-me state (switch nine should be open, represented by a 1). Refer to figure 3-2. The rf95t is shipped with the switch set for the rf95t-me state. Table 3-1. A sample of station id numbers a...

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    Section 3. Radiotelemetry network components 3-3 packet are routed from the computer to the dataloggers on demand. These maintenance type operations include the following: • clock set or check. • datalogger program download. • get table definitions (query the datalogger to see what data it has). • d...

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    Section 3. Radiotelemetry network components 3-4 not respond during this time, a “bad link” error messages is returned. The rfbase marks that remote as bad and will return a “bad link” message each time the computer attempts to send packets to that site. The rfbase will continue to include the faile...

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    Section 3. Radiotelemetry network components 3-5 3.2.2 radio specifications the rf100 and rf200 radios are manu- factured by e.F. Johnson. Campbell scientific modifies the radios to work with the rf95t modem. Table 3-5 contains a list of the main radio specifications. Table 3-5. Main radio specifica...

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    Section 3. Radiotelemetry network components 3-6 3.3.2 antenna orientation antennas must be oriented correctly to allow communication between rf sites. First determine if your antenna is omnidirectional or unidirectional. An omnidirectional antenna will transmit/ receive in a full 360 degree circle....

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    Section 3. Radiotelemetry network components 3-7 table 3-7 common antennas and characteristics vhf or pipe mounting antenna type uhf cable gain(db) o.D. Type ba1010 omni vhf coax nm-l unity 3/4" - 2 1/8" u-bolts ba1012 omni vhf coax nm-l unity 1" - 2 1/4" u-bolts ba1312 omni vhf coax nm-l 3.0 1" - 2...

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    Section 3. Radiotelemetry network components 3-8 3.4.3.2 ps12la lead acid power supply the ps12la power supply includes a 12v, 7.0 amp-hour lead acid battery, ac transformer, and a temperature-compensated charging circuit with a charge indicating diode. An ac transformer or solar panel should always...

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    Section 3. Radiotelemetry network components 3-9 the rf232t base station includes an rf95t modem with a carrier detect light. The rf95t modem sits directly behind the rf232t front panel. For a description of the carrier detect light and the communication protocol, refer to section 3.1 "rf95t modem."...

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    Section 3. Radiotelemetry network components 3-10 figure 3-8. Top view of the rf232t base station.

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    4-1 section 4. Operation of the radiotelemetry network all field stations can be accessed and monitored from the central base site. Regular visits to the field sites are required to ensure that all sensors are in place, enclosures are dry, solar panel is clean, and that the tripod and antenna are se...

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    Section 4. Operation of the radiotelemetry network 4-2 do _____ retries using a _______ sec period then use _______ sec: this allows specifying the rate of reties for a maintenance operation that fails. The intervals must be long enough to allow the operation being retried to complete. Generally, it...

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    Section 4. Operation of the radiotelemetry network 4-3 enabling the hipriority flag will cause rtm, and in turn dlsmgr and the rfbase, to attempt to collect data as fast as possible from the station(s) used on the affected template. The rfbase will poll these sites as fast it can while maintaining p...

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    Section 4. Operation of the radiotelemetry network 4-4 select cr10t as the datalogger type: parameters. Press the space bar to step through the options. Press enter to advance to the next parameter. Select the correct communication port by pressing the space bar at the use asynchronous communication...

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    Section 4. Operation of the radiotelemetry network 4-5 the call station stationname option is used to initiate a connection with the field site. After the call, graphterm remain in telecommunications (on-line) with the remote site. The call option can be used to test the communication path to a fiel...

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    Section 4. Operation of the radiotelemetry network 4-6 the examine data tables option allows the datalogger tables to be displayed in tabular form. Graphterm prompts will allow the selection of which tables and fields within the tables will be examined. As in the monitor mode (see above) these displ...

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    A-1 appendix a. Setting the station id each rf modem has nine dip switches; the first eight must be set for a particular station id. Following is a list of all possible station ids with the corresponding setting of the dip switches. Here, 1 represents open, 0 is closed, and switch 9 should be open. ...

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    Appendix a. Setting the station id a-2 switches switches switches id 1234 56789 id 1234 56789 id 1234 56789 41 1001 0100x 84 0010 1010x 127 1111 1110x 42 0101 0100x 85 1010 1010x 128 0000 0001x 129 1000 0001x 172 0011 0101x 215 1110 1011x 130 0100 0001x 173 1011 0101x 216 0001 1011x 131 1100 0001x 1...

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    B-1 appendix b. Alternate base station configurations the basic base station consists of a computer and the rf232t base station. There are other options for a base station including a portable base station, a phone-to-rf base station, and a phone-to-rf base station with measurement capability. B.1 t...

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    C-1 appendix c. Power calculations there must be enough transmission power in any rf link to complete communication. The sources of power are the radio and the antennas. Conversely, power is lost both through the cables (coax loss) and over the distance of communication (path loss). The power of the...

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    D-1 appendix d. Fundamentals of radiotelemetry d.1 radio waves radiotelemetry is the process of transferring information (data) in the form of radio waves. The data is transferred on a carrier wave which normally has a sinusoidal form. Therefore, the carrier wave can be described entirely by the fre...

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    Appendix d. Fundamentals of radiotelemetry d-2 every antenna has a known horizontal and vertical pattern of radiation. The horizontal radiation pattern consists of any segment of a 360 degree circle surrounding the antenna. The horizontal pattern is important to consider when a rf station is to comm...