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User Manual 

2.3.1 Result 

Code 

The Result Code is a numeric variable that is set true (-1) when the 
ArgosDataRepeat instruction is successful. 

2.3.2 Repetition 

Rate 

The Repetition Rate will set the time between each repetition.  A negative number 
will cause the default repetition rate to be used.  Using a value between 0 and 255 
will set the repetition rate to the new value plus 42 seconds.  The  
ST-21 adds 42 seconds to the repeat rate with the maximum being 297. 

2.3.3 Number 

Repeats 

Number Repeats is how many times the transmission will be repeated.  Valid 0 to 
255. 

2.3.4 Buffer 

Number 

BufferNumber() is an eight element array of Boolean.  Each element of 
BufferNumber corresponds to the same buffer number -1 in the ST-21.  Set the 
corresponding element to true to use a buffer, or false to not use the buffer.  Data 
can be in a buffer that is set to false.  

The ArgosDataRepeat instruction is most useful when only using 1 ID number 
because time between each buffer transmission is the rep rate.  When using several 
ID numbers for each platform, the ArgosTransmit instruction allows the 
datalogger to control the timing of each transmission. 

If a buffer is set to transmit, but the buffer has not been setup with valid 
parameters, ArgosDataRepeat will fail.  

2.4 ArgosTransmit 

Usage: ArgosTransmit(Result Code, Buffer Number) 

2.4.1 Result 

Code 

The Result Code is a numeric variable that is set true (-1) when the ArgosTransmit 
instruction is successful. 

2.4.2 Buffer 

Number 

The Buffer Number designates which ST-21 buffer is transmitted.  Valid entries 
are 0 through 7. 

ArgosTransmit is used to initiate a single transmission immediately.  One must be 
careful because the datalogger program is totally responsible for the actual 
repetition rate when using this instruction.  Works well for those with multiple ID 
numbers needing more data throughput and total control over the timing of 
transmissions.  

When multiple ID numbers are used, the ArgosTransmit() function works best.  
When ArgosTransmit() is executed, the contents of the specified data buffer are 
transmitted once.  ArgosTransmit() gives full control of timing of transmissions to 
the datalogger programmer.  Special care must be taken to avoid transmitting too 
often.  The programmed repetition period must match the System Use Agreement 
between the user and Service Argos. 

Содержание ST21

Страница 1: ...ST 21 Argos Satellite Transmitter User Manual Issued 10 12 12 Copyright 2006 2012 Campbell Scientific Inc Copied under licence by Campbell Scientific Ltd CSL 884...

Страница 2: ......

Страница 3: ...e repair is under guarantee or not Please state the faults as clearly as possible and if the product is out of the guarantee period it should be accompanied by a purchase order Quotations for repairs...

Страница 4: ......

Страница 5: ...l cell phones and aerials may also not be applicable according to your locality Some brackets shields and enclosure options including wiring are not sold as standard items in the European market in so...

Страница 6: ......

Страница 7: ...Number 3 2 1 3 Decimal ID Number 3 2 1 4 Frequency 3 2 2 ArgosData 3 2 2 1 General Description 4 2 2 2 ResultCode 4 2 2 3 ST21Buffer 4 2 2 4 DataTable 4 2 2 5 NumRecords 4 2 2 6 DataFormat 4 2 3 Argos...

Страница 8: ...ansmitter 1 1 2 The ST 21 s 9 pin connector attaches to the datalogger via the SC12 cable 2 3 1 The ST 21 s BNC connector attaches to the antenna via the antenna cable 6 3 2 The 12022 antenna 7 Tables...

Страница 9: ...Figure 1 1 ST 21 Argos Satellite Transmitter 1 1 Specifications Power supply Nominal 12 volts DC 10 volts DC minimum 16 volts DC maximum Current drain at 12 volts 1 12 mA quiescent 375 mA during trans...

Страница 10: ...ng 20 bit ID numbers 32 bytes of data can be stored in the buffer The data buffers are numbered 0 through 7 with 7 being reserved for other uses Data buffer setup can be done by the factory or under d...

Страница 11: ...in memory until the PTT resets Once the setup parameters are set use ArgosData followed by ArgosAutoRepeat Data in a buffer is saved until the PTT resets or is overwritten by another occurrence of Ar...

Страница 12: ...ds NumRecords is the number of data records that will be copied from the data table to the Argos PTT Care should be taken to make sure the total amount of data does not exceed what the buffer can hold...

Страница 13: ...smit instruction allows the datalogger to control the timing of each transmission If a buffer is set to transmit but the buffer has not been setup with valid parameters ArgosDataRepeat will fail 2 4 A...

Страница 14: ...a Connector and Antenna The ST 21 s BNC connector is for attaching the antenna see Figure 3 1 Figure 3 1 The ST 21 s BNC connector attaches to the antenna via the antenna cable The connector s RF outp...

Страница 15: ...lite passes over the poles 14 times a day providing 28 satellite passes per day Coverage decreases with latitude At the equator the PTT will see a satellite six or seven times a day The duration of th...

Страница 16: ...1 http www cls fr html argos welcome_en html 5 Antenna Placement The position of polar orbiting satellites relative to the PTT will change during the satellite pass and with each satellite pass The an...

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Страница 18: ...rta T5M 1W7 CANADA www campbellsci ca dataloggers campbellsci ca Campbell Scientific Centro Caribe S A CSCC 300N Cementerio Edificio Breller Santo Domingo Heredia 40305 COSTA RICA www campbellsci cc i...

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