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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
displays are limited to the data in the
datalogger and data is collected on demand.
Old data maybe scrolled through or the
displays can be allowed to “advance."

The LINK TEST FOR RF option allows the
entry of an RF link or path to be tested.  The
path is entered just as in NetAdmin, giving
the station ID of the remote repeater or field
site for single links.  Multiple site links may
be tested by preceding the remote station ID
with station ID from sites to be used as
repeaters.  Separate the station ID numbers
with commas.  Links, other than the one to
the station specified in the station file, may
be tested.

The EDIT STATION PARAMETERS allows
editing of the station file settings or the
selection of a different station file to use.

The VIEW GRAPHICS FILE allows “slide
show” viewing of the GraphTerm graphical
monitoring screens saved earlier.

The QUIT option hangs up the
telecommunication link to the remote site (if
it was previously established) and exits
GraphTerm.  GraphTerm will automatically
hang up with a site after a certain period of
inactivity while at the main options screen.
GraphTerm will give a warning before
hanging up.

Содержание RTMS SYSTEMS

Страница 1: ...RF FOR RTMS SYSTEMS INSTRUCTION MANUAL REVISION 3 95 COPYRIGHT c 1995 CAMPBELL SCIENTIFIC INC...

Страница 2: ...ntability or fitness for a particular purpose CAMPBELL SCIENTIFIC INC is not liable for special indirect incidental or consequential damages Products may not be returned without prior authorization To...

Страница 3: ...ttempts 2 3 2 6 Adding Stations to the Net Description 2 4 2 7 Radio Test Results 2 4 SECTION 3 RADIOTELEMETRY NETWORK COMPONENTS 3 1 The RF95T Modem 3 1 3 2 RF100 RF200 Radios 3 4 3 3 Antennas and Ca...

Страница 4: ...rams and displaying current readings from the datalogger The requirements specific to a radiotelemetry network include The distance between radio stations should not be greater than approximately 25 m...

Страница 5: ...ing the desired measurements Any field station can also operate as a repeater The only requirement is that the station s antenna must be able to communicate in all desired directions This may require...

Страница 6: ...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 done from the base station Equipmen...

Страница 7: ...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 function as a repeater Equipment Requir...

Страница 8: ...e radio directly onto the bottom of the RF232T Secure the BNC connector from the radio s cable to its hole on the back of the RF232T See Figure 3 7 for assistance 3 Connect the radio to 12 V ground an...

Страница 9: ...ast type of message about this station If the site is black no communication has been attempted yet If the site is red or blue than a warning or fault message has occurred If the site is green success...

Страница 10: ...H SETTING box Separate the ids with a space When the BEGIN button is selected the entire link will be tested The signature of the remote site will still be returned An additional row of quality number...

Страница 11: ...made 2 6 1 NETWORK HEALTH DISPLAY AND ERROR WARNING AND STATUS MESSAGES As remote sites are added to the network description they also appear on the network health display NetAdmin main screen The col...

Страница 12: ...ough and will be retransmitted at a smaller size Over RF data is transferred as a stream of bits encoded into short and long periods of time between transitions We call the short time a 1T period and...

Страница 13: ...d The following capabilities are important when using RTMS CR10T and RF95T modems A maximum depth of four repeaters can be used 150 is maximum number of remote RF95T CR10T site that may be used with a...

Страница 14: ...Station ID 3 1 4 THE CARRIER DETECT LIGHT The Carrier Detect Light on the front panel of the RF95T has several purposes The primary function of the light is to indicate when data is being received or...

Страница 15: ...e or last common repeater sending a single short broadcast to all remotes in the affected area Each remote RF95T upon receiving the broadcast checks the local datalogger for any computer bound packets...

Страница 16: ...ed 9 TXD Received by RF95T 3 1 9 RF95T CURRENT DRAIN Quiescent 1 4 mA Wait 3 4 mA Active 30 mA Waiting to respond to broadcast Usually the radio current drain is the relevant factor in battery power c...

Страница 17: ...he following steps will install a radio for a field or repeater station 1 Secure the radio and its bracket using the four screws from the RF95T Modem s lid 2 Connect the 10 pin connector with the red...

Страница 18: ...TORS The most common cable type to connect a radio to the antenna is a coaxial RG 8A U cable Two connectors are required for each length of cable The connector for the radio is a BNC type connector Th...

Страница 19: ...ort 3 4 2 ENCLOSURES Enclosures are needed to keep water and debris from damaging the data acquisition equipment Campbell Scientific Inc enclosures are designated as raintight and are designed to moun...

Страница 20: ...to drop voltage and the other to raise voltage Alkaline batteries connected to the external port would be charged by the charging source which can cause an explosion CAUTION Do not use the external po...

Страница 21: ...230 or 240 VAC if a small wiring modification is done 1 First disconnect any AC power 2 Lift the cover off the RF232 and locate the power supply P N 4918 as shown in Figure 3 8 3 Unscrew the four Phil...

Страница 22: ...SECTION 3 RADIOTELEMETRY NETWORK COMPONENTS 3 10 FIGURE 3 8 Top View of the RF232T Base Station...

Страница 23: ...until another description is made active even if RTMS is completely stopped If alternative communication paths exist i e a backup repeater in case the main repeater fails network descriptions utilizin...

Страница 24: ...hould be large enough to accommodate the initial attempt and some retries 4 1 1 3 NETWORK HEALTH AND STATUS WARNING FAULT MESSAGES The RF specific messages are described in Section 2 6 1 of this manua...

Страница 25: ...only be used with one site at a time and is not intended for unattended use While it is possible to have a station communicating with RTMS and GraphTerm at the same time more predictable behavior is e...

Страница 26: ...er that is set with the switches in the RF95T The PATH parameter is the station number of the RFBase see above STATION NO followed by a colon As with the datalogger if the NetAdmin NBR parameter for t...

Страница 27: ...The datalogger flags and ports may also be toggled Values can also be directly loaded into Input Locations Data can be collected for archiving while monitoring GraphTerm also supports the display of...

Страница 28: ...ater or field site for single links Multiple site links may be tested by preceding the remote station ID with station ID from sites to be used as repeaters Separate the station ID numbers with commas...

Страница 29: ...1001 1100X 100 0010 0110X 15 1111 0000X 58 0101 1100X 101 1010 0110X 16 0000 1000X 59 1101 1100X 102 0110 0110X 17 1000 1000X 60 0011 1100X 103 1110 0110X 18 0100 1000X 61 1011 1100X 104 0001 0110X 19...

Страница 30: ...10 0111X 146 0100 1001X 189 1011 1101X 232 0001 0111X 147 1100 1001X 190 0111 1101X 233 1001 0111X 148 0010 1001X 191 1111 1101X 234 0101 0111X 149 1010 1001X 192 0000 0011X 235 1101 0111X 150 0110 10...

Страница 31: ...the cable The two leads on the SC532 should be stripped and tinned for connection to a battery Most laptops have a 9 pin RS232 port so a 9 to 25 pin RS232 cable is needed to connect the computer to t...

Страница 32: ...ts 95 dBm Signal Power SP TP AG PL CL where SP Signal Power dBm Power of the signal received TP Transmit Power dBm Rated output power of transmitting radio PL Path Loss dB Power lost over the distance...

Страница 33: ...e frequency the stronger the radiation field However at higher frequencies more energy is absorbed by the surface The VHF and UHF frequencies can travel only a short distance between radio stations Th...

Страница 34: ...er at the computer is responsible for naming the desired communication path with a setup string This setup string contains any repeater modem IDs and the destination modem ID in sequence After sending...

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