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Campbell ST-21 Argos User Manual

Satellite transmitter st-21 argos
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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

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Summary of Contents for Campbell ST-21 Argos

  • Page 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...
  • Page 3 Quotations for repairs can be given on request. It is the policy of Campbell Scientific to protect the health of its employees and provide a safe working environment, in support of this policy a “Declaration of Hazardous Material and Decontamination”...

  • Page 5: About This Manual

    PLEASE READ FIRST About this manual Please note that this manual was originally produced by Campbell Scientific Inc. primarily for the North American market. Some spellings, weights and measures may reflect this origin. Some useful conversion factors: Area: 1 in...

  • Page 7: Table Of Contents

    Contents PDF viewers: These page numbers refer to the printed version of this document. Use the PDF reader bookmarks tab for links to specific sections. 1. Overview ..............1 Specifications ..................1 Serial Port ....................1 Data Buffers ................... 2 Multiple Argos ID Numbers ..............
  • Page 8 Figures 1-1. ST-21 Argos Satellite Transmitter ............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 1-1.

  • Page 9: Overview

    224 gm, 7.9 oz Serial Port The ST-21 is specifically designed to work with Campbell Scientific CRBasic dataloggers. The ST-21 serial port connects to the CS I/O port of the datalogger via an SC12 cable (see Figure 1-2). The datalogger provides 12 volt DC power and ground through pins 8 and 2 respectively.

  • Page 10: Data Buffers

    ST-21 Argos Satellite Transmitter Table 1-1. ST-21 Serial Port Configuration Pin number Function +5 volts Ground TXD (data out) SDE (input) CLK/HS (input) +12 volts RXD (data in) Figure 1-2. The ST-21’s 9-pin connector attaches to the datalogger via the...

  • Page 11: One Argos Id Number

    The maximum number of transmissions that can be scheduled with ArgosDataRepeat() is 255. Datalogger Programming There are 5 programming instructions available for use with the ST-21 Argos PTT: ArgosSetup, ArgosData, ArgosDataRepeat, ArgosTransmit, and ArgosError. The use of ArgosSetup is optional. ArgosData and ArgosDataRepeat are used to enable transmission of data.

  • Page 12: General Description

    2.2.6 DataFormat There are two data formats. Enter “FP2” to use the Campbell Scientific two byte, floating decimal point format. To use FP2, the data table (Section 2.2.4) must store data as type FP2. Each data value will use two bytes of memory. Enter “nnn.nnn.nnn…”...

  • Page 13: Result Code

    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.

  • Page 14: Argoserror (Error As String)

    ST-21 Argos Satellite Transmitter ArgosError (Error as string) Public ErrorCodes as string * 20 ArgosError(ErrorCodes) 2.5.1 ErrorCodes ErrorCodes is a string variable. ArgosError sends the command &h09, and then waits for the returned string plus the ACK or NAK character. The returned string is stored in the string variable ErrorCodes.

  • Page 15: Environmental Enclosure

    User Manual Figure 3-2. The #12022 antenna Environmental Enclosure The ST-21 is designed to work in a dry, non-condensing environment. A proper enclosure should be used to keep water, dust and other environmental contaminates away from the ST-21. Always use desiccant inside the enclosure to keep trapped moisture from condensing on the electronics.

  • Page 16: Antenna Placement

    ST-21 Argos Satellite Transmitter More detailed information regarding Service Argos and satellite coverage is available from Service Argos. On the Web, see http://www.argosinc.com/. The Service Argos North American office can be contacted by email at useroffice@argosinc.com or phone (301) 925-4411.
  • Page 18 CAMPBELL SCIENTIFIC COMPANIES Campbell Scientific, Inc. (CSI) 815 West 1800 North Logan, Utah 84321 UNITED STATES • www.campbellsci.com info@campbellsci.com Campbell Scientific Africa Pty. Ltd. (CSAf) PO Box 2450 Somerset West 7129 SOUTH AFRICA • www.csafrica.co.za sales@csafrica.co.za Campbell Scientific Australia Pty. Ltd. (CSA)

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