Campbell TX325 Product Manual
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Campbell TX325 Product Manual

Satellite transmitter for goes v2
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09/2019
Copyright ©
2019
Campbell Scientific, Inc.

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  • Page 1 09/2019 Copyright © 2019 Campbell Scientific, Inc.
  • Page 2 Limited warranty “Products manufactured by CSI are warranted by CSI to be free from defects in materials and workmanship under normal use and service for twelve months from the date of shipment unless otherwise specified in the corresponding product manual. (Product manuals are available for review online at www.campbellsci.com.) Products not manufactured by CSI, but that are resold by CSI, are warranted only to the limits extended by the original manufacturer.
  • Page 3 Campbell Scientific reserves the right to refuse service on products that were exposed to contaminants that may cause health or safety concerns for our employees.
  • Page 4 Periodically (at least yearly) check electrical ground connections. WHILE EVERY ATTEMPT IS MADE TO EMBODY THE HIGHEST DEGREE OF SAFETY IN ALL CAMPBELL SCIENTIFIC PRODUCTS, THE CUSTOMER ASSUMES ALL RISK FROM ANY INJURY RESULTING FROM IMPROPER INSTALLATION, USE, OR MAINTENANCE OF TRIPODS, TOWERS, OR...

  • Page 5: Table Of Contents

    Table of contents 1. Introduction 2. Precautions 3. Initial inspection 4. QuickStart 4.1 Data collection platform (DCP) installation 5. Overview 5.1 GOES, NESDIS, and transmit windows 6. Specifications 7. Installation 7.1 Field site requirements 7.2 LED function 7.3 Ports and connectors 7.4 Transmission antenna 7.5 GPS antenna 7.6 Data logger programming...
  • Page 6 B.3 Transmission durations Appendix C. Compliance documents and certificates Table of Contents - v...

  • Page 7: Introduction

    The TX325 transmitter sends data via Geostationary Operational Environmental Satellites (GOES), and is the successor to the TX321. In the Western Hemisphere, the TX325 is compatible for use with NOAA GOES DCS with a coverage range including Canada, the United States of America, and Mexico—as well as most countries in Central America and many South American countries.
  • Page 8 1. Connect the data logger RS-232 to the TX325 RS-232 connector and connect the data logger to a power supply. Also ensure the TX325 has power. 2. Connect to the data logger using Device Configuration Utility. a. Do the following to directly connect your data logger to the Device Configuration Utility: i.
  • Page 9 9. Select the Random Transmission Baud Rate as assigned by the GOES DCS Program. 10. Type the Random Transmission Channel as assigned by the GOES DCS Program. 11. Select the Self-Time Baud Rate as assigned by the GOES DCS Program. TX325 Satellite Transmitter for GOES V2...

  • Page 10: Data Collection Platform (Dcp) Installation

    GOES satellite network. 4.1 Data collection platform (DCP) installation 1. Yagi antenna installation procedure: a. Mount the Yagi antenna to a pole or mast by using the U-bolts included with the antenna mount. TX325 Satellite Transmitter for GOES V2...
  • Page 11 2. GPS antenna installation procedure: a. Connect the GPS cable to the GPS antenna. b. Route the cable through the 0.75-inch IPS threaded pipe and insert the pipe into the GPS antenna. TX325 Satellite Transmitter for GOES V2...
  • Page 12 Concrete might also be a problem. Heavy foliage, snow, and ice will attenuate the GPS signal. 3. Mount the TX325, the power supply, and the data logger to the backplate of an enclosure. 4. Mount the enclosure and solar panel to the pole or tripod.

  • Page 13: Overview

    The TX325 can transmit either self-timed or random GOES messages to the GOES West and GOES East satellites. In a typical configuration, the TX325 is connected to a data logger via an RS-232 serial connection. The data logger makes measurements, then formats those values to create a data packet, which is transferred to the transmitter at time of transmission.

  • Page 14: Goes, Nesdis, And Transmit Windows

    GPS receiver (±100 μs), and the internal clock is capable of maintaining accurate time for a minimum of six days without a GPS fix. If the TX325 finds itself without an accurate time, it suspends data transmissions until an accurate time is obtained. The GPS time is synched every 11 hours.
  • Page 15 37 to 41 dBm (300 bps), 43 to 47 dBm (1200 bps) Frequency range: 401.701 to 402.09925 MHz Initial frequency stability: ±20 Hz disciplined to GPS (GPS fix occurs after power up and once per day thereafter) TX325 Satellite Transmitter for GOES V2...

  • Page 16: Installation

    The GPS antenna must have a clear view of most of the sky and the transmission antenna must have a clear view of the spacecraft. The TX325 must be installed in a well desiccated, environmentally sealed enclosure. Its mounting plate has keyholes for securing the TX325 to the backplate of a Campbell Scientific enclosure.

  • Page 17: Led Function

    7.2 LED function A green Status LED and a red Failsafe LED indicate the state of the TX325 transmitter by using various blink patterns. Table 7-1 (p. 11) and Table 7-2 (p. 11) provide the blink patterns for the green Status and red Failsafe LEDs, respectively.

  • Page 18: Ports And Connectors

    300 bps transmission rates, the maximum transmit power is 31 dBm. At 1200 bps, the transmit power is 37 dBm. The GPS port on the TX325 is an SMA female connector for attaching an active 3.3 V GPS antenna. Operation without a GPS antenna connected will not cause damage, but the transmitter will not transmit without a valid GPS fix.

  • Page 19: Gps Antenna

    For the Model, enter 3 to use the TX325. For the BufferControl, a value of 0 writes to the self-timed buffer and a value of 1 writes to the random buffer.
  • Page 20 The CRBasic program reads the TX325 settings using the following format: Variable = Settings.FieldName For example, goes_comport = Settings.GOESComPort reads the Com port setting and stores it in the GOESComPort variable. The TX325 settings are typically read in a SlowSequence section of the program.

  • Page 21: Read And Write Settings

    Port used to communicate with the GOES transmitter. Controls whether the data loggers polls the GOESComPort to see if a TX325 radio is attached to it. With the default setting of 0 (not enabled), GOESEnabled the data logger ignores all other GOES settings. A value of 1 enables the setting.

  • Page 22: Read-Only Settings

    0, unless the transmission window is less than 60 seconds. Maximum offset is 23:59:59. A value 0 results in no offset. Number of times within the random transmit interval that the TX325 will GOESRepeatCount transmit the message data. Valid entries are 1 to 3.
  • Page 23 Channel number used during the last radio transmission. Type of transmission used during the last radio GOESLastTypeCode transmission. GOESLastDatelength Number of bytes in the last radio transmission. GOESLastHDRFlagWord HDR flag word used in the last radio transmission. TX325 Satellite Transmitter for GOES V2...

  • Page 24: Troubleshooting

    (p. 8)). Next, check the red Failsafe LED. If the LED is on continuously, the TX325 is in its fail safe mode, which is cleared by pressing the Reset button. The Reset button is located near the LEDs and is accessed through a hole in the side of the...
  • Page 25 FIGURE 8-1. Reset button location The TX325 transmitter will go into the fail safe mode if one of two events occurs: 1. The transmitter RF output is turned on and left on for more than 110 seconds. 2. The transmitter is given a command to transmit less than 30 seconds after a transmission has taken place.

  • Page 26: Appendix A. Eligibility And Getting Onto The Goes System

    2. Sign and submit the MOA. After the MOA is approved, NESDIS will issue a channel assignment and an ID address code. 3. IMPORTANT: Contact NESDIS to coordinate a start-up date. https://dcs2.noaa.gov for more information. TX325 Satellite Transmitter for GOES V2...

  • Page 27: Appendix B. Goes Data Formats And Transmission Durations

    Number will be rounded to selected precision during conversion, for example, +12.345 will be rounded to +12.35. Value is always 7 characters. Value is always signed (+/-). Value always has trailing comma. Valid data outside of operating range will be pegged at –7999 or +7999. TX325 Satellite Transmitter for GOES V2...

  • Page 28: Fixed-Decimal Ascii

    –99 to 999 012 -34 xxxxx –9999 to 99999 00012 -0034 xxx.x –99.9 to 999.9 001.2 -03.4 xx.xx 0.01 –9.99 to 99.99 00.12 -0.34 x.xxx 0.001 –.999 to 9.999 0.012 -.034 TX325 Satellite Transmitter for GOES V2...

  • Page 29: Raws7, 7 Data-Point Ascii

    Table B-4: Pseudo binary ranges Pseudo binary type Range 1-byte encoded unsigned integer 0 to +63 1-byte encoded signed integer –32 to +31 2-byte encoded unsigned integer 0 to +4094 2-byte encoded signed integer –2048 to +2047 TX325 Satellite Transmitter for GOES V2...

  • Page 30: Fp2, 16-Bit Floating Point Number

    0 = positive, 1 = negative. Exponent (E) 14 and 13 Specifies the magnitude of the negative decimal exponent. Mantissa (M) 12 to 0 (LSB) Specifies the magnitude of the 13-bit mantissa, 0 to 8191 TX325 Satellite Transmitter for GOES V2...

  • Page 31: 18-Bit Integer

    Char1 = C Char2 = @ Char3 = y B.2.3 Additional pseudo binary representations Other pseudo binary representations, such as 6, 12, and 24 bit integers, can be formed and transmitted by using CRBasic. TX325 Satellite Transmitter for GOES V2...
  • Page 32 GOES 1200 bps Assigned time-slot maximum data per message maximum data per message duration (seconds) (bytes) (bytes) 1444 2194 2944 3694 1090 4444 1278 5194 1465 5944 1653 6694 1840 7444 2028 8194 2215 8944 TX325 Satellite Transmitter for GOES V2...
  • Page 33 Compliance documents include the ISO certificate (FIGURE C-1 (p. 27)) and the GOES V2 certificate (FIGURE C-2 (p. 28)). The TX325 EU Declaration of Conformity is available at: www.campbellsci.com/tx325. Certificate of Registration This certifies that the Quality Management System of Signal Engineering, Inc.
  • Page 34 FIGURE C-2. GOES V2 certificate TX325 Satellite Transmitter for GOES V2...
  • Page 35 INFO Global Sales & Support Network A worldwide network to help meet your needs Australia Costa Rica Southeast Asia Garbutt, QLD Australia San Pedro, Costa Rica Bangkok, Thailand Location: Location: Location: 61.7.4401.7700 506.2280.1564 66.2.719.3399 Phone: Phone: Phone: info@campbellsci.com.au info@campbellsci.cc thitipongc@campbellsci.asia Email: Email: Email:...

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