Campbell Scientific TX325 User manual

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Revision: 01/2021

Campbell Scientific, Inc.

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1. Introduction 1

2. Precautions 1

3. Initial inspection 1

4. QuickStart 2

4.1 Data collection platform (DCP) installation 4

5. Overview 7

5.1 GOES, NESDIS, and transmit windows 8

6. Specifications 10

7. Installation 11

7.1 Field site requirements 11

7.2 LED function 12

7.3 Ports and connectors 13

7.4 Transmission antenna 14

7.5 GPS antenna 14

7.6 Data logger programming 14

7.6.1 Read and write settings 16

7.6.2 Read-only settings 17

8. Troubleshooting 19

8.1 Troubleshooting over-air transmissions 20

Appendix A. Eligibility and getting onto the GOES system 23

Appendix B. Data formats and transmission durations 24

B.1 ASCII data format 24

B.1.1 7-byte floating-point ASCII (GOESTable() format option 1) 24 B.1.2 ASCII table space (GOESTable() format option 2) 26 B.1.3 ASCII table space, comma separated (GOESTable() format option 3) 29 B.1.4 Line SHEF (Standard Hydrological Exchange Format) (GOESTable() format option 6) 31

B.2 Pseudobinary data formats 32

Table of Contents - i

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B.2.1 Campbell Scientific FP2 data 33 B.2.2 Pseudobinary 38 B.2.3 Additional pseudobinary representations 38

B.3 Transmission durations 38

Appendix C. Compliance documents and certificates 40

Table of Contents - ii

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1. 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.

The TX325 is the telemetry backbone for many data collection platforms (DCP) that use GOES. The satellite transmitter can be integrated with a number of Campbell Scientific data loggers and is an available communications option for many systems, serving a wide range of applications.

2. Precautions

l READ AND UNDERSTAND the Safety section at the back of this manual.

l Although the TX325 is rugged, it should be handled as a precision scientific instrument.

l A proper antenna connection is required before transmission occurs. Failure to use a

properly matched antenna cable and antenna may cause permanent damage to the radio frequency (RF) amplifiers.

l The TX325 requires an active GPS antenna with a maximum gain of 25 dB. The TX325 will

supply 3.3 V to the active GPS antenna.

3. Initial inspection

l Upon receipt of the TX325, inspect the packaging and contents for damage. File damage

claims with the shipping company.

l Check the ships with list to ensure all components are received.

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4. QuickStart

Use our Device Configuration Utility to enter the required National Environmental Satellite Data and Information Service (NESDIS) information that is unique to each data collection platform (DCP). This QuickStart is for the CR6 (≥OS 10), CR300-series (≥OS 10), CR1000X (≥OS 4), and GRANITE-series (≥OS1) data loggers.

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. Use the USB cable to connect the data logger to the computer.

ii. Click your data logger model for the Device Type in the Device Configuration

Utility.

iii. Click Direct for the Connection Type.

iv. Select the COM port on the computer to which the data logger is connected.

v. Click Connect.

b. For data loggers on an IP connection, do the following to remotely connect with the

Device Configuration Utility:

i. Click your data logger model for the Device Type in the Device Configuration

Utility.

ii. Click IP for the Connection Type.

iii. Type the Server Address.

iv. Type the PakBus/TCP Password.

v. Click Connect.

3. Click the Settings Editor tab.

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4. Click the GOES Radio sub tab (FIGURE 4-1 (p. 3)).

FIGURE 4-1. Device Configuration Utility GOES Radio screen

5. Select Enabled from the Goes Radio Enabled field.

6. Select the Com Port to which the GOES radio is connected.

7. Type the Self-timed Message Windows (in seconds) as assigned by the GOES DCS Program.

8. Type the Platform ID (in HEX) as assigned by the GOES DCS Program.

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.

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12. Type the Self-Time Channel as assigned by the GOES DCS Program.

13. Type the Random Transmission Interval as assigned by the GOES DCS Program. Format is hh:mm:ss.

14. Type the Self-timed Transmission Interval as assigned by the GOES DCS Program. Format is dd:mm:hh:ss.

15. Type the Self-timed Transmission Offset as assigned by the GOES DCS Program. Format is hh:mm:ss.

16. Click the Deployment tab.

17. Click the Com Port Settings sub tab.

18. Select 9600 for the Baud Rate.

19. Click Apply to save the changes.

Now the settings are stored in the data logger. CRBasic programming is required to push data over the network. The GOESTable() and GOESField() CRBasic instructions used in conjunction with DataTable() facilitate the transmission of data across the 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.

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b. Attach elements to boom.

NOTE: When attaching elements to the boom, make sure to place them such that the number of grooves on the element equals the number of dimples on the boom. For example, the element with four grooves should be placed at the spot on the boom with four dimples, and so forth.

c. Aim the Yagi antenna at the spacecraft; azimuth and elevation angle positions are

included on the bracket label.

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.

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c. Mount the 0.75-inch IPS threaded pipe to a crossarm by using the Nu-Rail® fitting,

or CM220 mounting bracket.

CAUTION: The GPS antenna will not receive a GPS signal through steel roofs or steel walls. 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.

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5. Connect the COAXNTN cable to the Yagi antenna. Route the COAXNTN cable through the enclosure conduit and connect it to the RF Out connector on the TX325 (FIGURE 4-2 (p.

7)).

FIGURE 4-2. TX325 connectors

6. Route the GPS antenna cable through the enclosure conduit and connect it to the GPS connector on the TX325 (FIGURE 4-2 (p. 7)).

7. Plug the green connector from the power supply to the green receptacle on the TX325.

8. Connect the data logger to the TX325 RS-232 terminal.

9. Route the solar panel cable through the enclosure conduit and connect the red and black wires to the CHG terminals on the CH150 or CH200.

5. 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. The data logger buffers the message until its transmission window (or random transmission time), then transmits the data at either 300 or 1200 bps.

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GPS is required for the radio to work in the GOES network. The GOES network is a TDMA network that requires all the radios in the network to have exact timing of their transmissions so they don't step on each other during transmissions. Extremely accurate timing is obtained from the integrated 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. The data logger clock is synched with the GPS time of the TX325 when using a GRANITE-series, CR6, CR1000X-series, and CR300-series data logger.

Features:

l NESDIS HDR V2 certified l Based on Signal Engineering OmniSat3 design l Compatible with GOES DCS system l Easy integration with Campbell Scientific data loggers l Field tested and proven track record of reliability l Embedded GPS receiver for stabilized internal time keeping and transmit frequency for

long service intervals

l Low standby current consumption for battery-powered systems at remote DCP installation

sites

l Quick assessment of radio health via monitoring of diagnostic data from the radio l Compatible CRBasic data loggers: GRANITE series, CR6, CR1000X, and CR300 series are fully

compatible. The CR3000, CR800 series, and CR1000 have limited compatibility.

5.1 GOES, NESDIS, and transmit windows

GOES coverage area is latitude 68° North to 68° South and longitude 150° East to 2° West (see

FIGURE 5-1 (p. 9)). GOES satellites have orbits that coincide with the Earth rotation, allowing each

satellite to remain above a specific region (geosynchronous). GOES has two satellites: GOES East located at 75° West longitude and GOES West located at 135° West longitude. Both satellites are located over the equator. Within the United States, odd-numbered channels are assigned to GOES East, and even-numbered channels are assigned to GOES West. Channels used outside of the United States are assigned to either spacecraft.

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FIGURE 5-1. Coverage of GOES East and GOES West satellites

The GOES system is administered by the National Environmental Satellite Data Information Service (NESDIS), which assigns addresses, uplink channels, and self-timed/random transmit time windows. Self-timed windows allow data transmission only during a predetermined time frame (typically 10 seconds every hour). Random windows are for applications of a critical nature, such as flood reporting, and allow transmission immediately after a threshold has been exceeded. The transmission is randomly repeated to ensure it is received. A combination of self-timed and random transmission can be executed by the TX325.

Refer to Eligibility and getting onto the GOES system (p. 23) for more information.

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6. Specifications

Compliance:

Transmissions supported:

Data formats: ASCII (SHEF),

Radio module:

Temperature range

Operating:

Storage:

Case dimensions

Without connectors:

With connectors:

Weight:

Supply voltage range:

Refer to

www.campbellsci.com/tx325

Timed (Scheduled), Random

OmniSat-3

–40 to 60 °C

–55 to 75 °C

15.88 x 12.7 x 4.57 cm (6.25 x 5 x 1.8 in)

15.88 x 14.99 x 4.57 cm (6.25 x 5.9 x 1.8 in) additional clearance required for cables, wires, and antennas

0.77 kg (1.7 lb)

10.5 to 16 VDC

Compliance documents and certificates (p. 40)

and

pseudo binary

Current drain at 12 VDC

While transmitting: < 2.5 A

Standby:

During GPS acquisition: < 50 mA

Baud rates: 300

Transmit power

Maximum: 31 dBm (300 bps), 37 dBm

Maximum EIRP: 41 dBm (300 bps), 47 dBm

Typical EIRP: 37 to 41 dBm (300 bps)

Frequency range:

< 5 mA (2.8 typical)

11 dbm gain antenna with 1 dbm line loss

43 to 47 dBm

401.701 to 402.09925 MHz

(1.8 typical)

(25 mA typical)

and 1200 bps

(1200 bps)

(1200 bps); based on a

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Initialfrequencystability:

±20 Hz disciplined to GPS (GPS fix occurs after power up and once per day thereafter)

Channel bandwidth:

GPS receiver type:

Maximum GPS antenna RF gain:

Timekeeping

Initial accuracy:

Drift:

GPS schedule:

Transmissioncontinuation without GPS fix:

Interface connectors

RS-232:

Satellite RF transmit out:

GPS:

1500 Hz

3.3 V active

25 dB

±100 μs (synchronized to GPS)

±40 ms/day (without GPS)

1 fix at power up (updated at ~11-hour rate)

6 days

DB9 F, DCE, 3-wire RS-232

Type N jack

SMA jack

(300 bps), 2250 Hz (1200 bps)

Power:

2-pin screw terminal, 0.2 in. pitch

7. Installation

7.1 Field site requirements 11

7.2 LED function 12

7.3 Ports and connectors 13

7.4 Transmission antenna 14

7.5 GPS antenna 14

7.6 Data logger programming 14

7.1 Field site requirements

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,

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environmentally sealed enclosure. Its mounting plate has keyholes for securing the TX325 to the backplate of a Campbell Scientific enclosure. Most GOES systems are powered by a battery charged by a solar panel. The solar panel must have a clear view of the southern sky. Pay special attention to winter sun angles.

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. 12) and Table 7-2 (p. 12) provide the blink patterns for the green Status and red Failsafe LEDs, respectively.

Table 7-1: Green LED Status indicator blink patterns

Blink pattern Indicates

Normal software is running.

At power up, blinks on and off two times.

At power up, blinks on and off three times.

On continuously.

Table 7-2: Red LED Failsafe indicator blink patterns

Blink pattern Indicates

Blinks on and off four times per second.

Blinks on and off two times per second for 30 s.

RS-232 control interfaces enabled.

Power-up initialization complete and ready to receive commands.

Bootloader software is running.

Ready to load new operating system.

Transmitter failed to start up normally after power up. Turn the transmitter off and on to reboot.

A transmission is in progress.

The post-transmit interval is in progress. The transmitter enters this state after its RF output is turned off either by a Reset command or by the normal completion of a data message transmission. The radio needs to wait 30 seconds before making another transmission to keep it from going into Failsafe mode.

On continuously.

TX325 is in the Failsafe mode. To clear a Failsafe mode, push the Reset button (FIGURE 8-1 (p. 20)). A power cycle will NOT clear the Failsafe mode.

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7.3 Ports and connectors

The RS-232 port is a DB9 male connector configured as DTE. Only three pins are used, transmit on pin two, receive on pin three, and ground on pin five. Transmit is an output and receive is an input to the TX325. The RS-232 port allows the transmitter to be connected to a data logger. Refer to the following table for the cable options and data logger connection.

Table 7-3: Cable options, data logger compatibility, and data logger connections

Cable description Compatible data loggers Data logger connection

RJ45 to DB9 female cable (-R option when ordered with the TX325)

SC110 TX/RX cable (-C option when ordered with the TX325)

Granite-series, CR6, CR1000X RS-232/CPI RJ45 port

White: Odd C or U terminal Brown: Even C or U terminal

Granite-series, CR6, CR1000X

Yellow: G Clear: G or ⏚

RS-232 DB9 female to DB9 male serial cable (-S option when ordered with the TX325)

The RF Out connector is for attaching the transmission antenna. A properly matched antenna cable and antenna must be connected to the TX325 before transmission occurs.

WARNING: Failure to use a properly matched antenna cable and antenna may cause permanent damage to the radio frequency (RF) amplifiers.

The nominal impedance is 50 ohms; the frequency range is approximately 400 to 403 MHz. At 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. The transmitter uses the GPS receiver for two functions. The precise GPS time is used to ensure scheduled transmissions occur at the proper time. The one-second GPS synchronization pulse is used to ensure a precise, drift-free carrier frequency.

CR300-series, CR3000,

RS-232 9-pin port

CR800-series, CR1000

The TX325 power connector has two pins: ground and 12 V for connection of the power supply. The input power requirement is 10.5 to 16 VDC can use up to 2.5 A. A power supply consisting of

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a CH150 or CH200 regulator, BP12 or BP24 battery, and a solar panel typically can support these requirements. For this power supply, the regulator connects to the TX325 power connector.

7.4 Transmission antenna

The TX325 transmission antenna is a right-hand circular polarized Yagi with 11 dBi gain. A bracket is included with the antenna for mounting to a mast or pole. The antenna is directional and should be aimed at the spacecraft. Both elevation and azimuth are unique to the location on the planet and must be set. A poorly aimed antenna will cause a drop in signal strength or possibly prevent successful transmission. As a guide, if the antenna is aimed 20 degrees off the spacecraft, the received power will be half of a properly aimed antenna. Beyond 20 degrees, the received power drops off quickly.

7.5 GPS antenna

The GPS antenna mounts to the end of a crossarm by using a 0.75-inch IPS threaded pipe and a

0.75-inch-by-1-inch Nu-Rail® fitting or CM220 mounting bracket. Mount the GPS antenna above obstructions, but with the shortest cable possible. The GPS antenna will not receive GPS signals through steel roofs, steel walls, or possibly concrete. Heavy foliage, snow, and ice will attenuate the GPS signal. An unobstructed view provides better GPS performance resulting in fewer ( or no) missed transmissions. Poor GPS antenna placement increases the number of missed transmissions, and possibly stops all GPS transmissions.

7.6 Data logger programming

NOTE: This section provides programming information for the GRANITE-series (≥OS 1), CR6 (≥OS

10), CR1000X (≥OS 4), and CR300-series (≥OS 10), data loggers. For information on programming the CR3000, CR800-series, and CR1000 data loggers, refer to the example program at www.campbellsci.com/downloads/tx325-example-program-cr3000-cr1000-cr800 or contact Campbell Scientific.

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The CRBasic program can read and enter TX325 settings. Settings can also be entered using the Device Configuration Utility (see QuickStart (p. 2)). Table 7-4 (p. 16) provides the TX325 settings that can be read and entered. Table 7-5 (p. 17) provides the read-only settings.

The CRBasic program should include the GOESTable() and GOESField() instructions used in conjunction with the DataTable() instruction to facilitate the transmission of data across the GOES satellite network. The GOESTable() instruction has the following syntax:

GOESTable (Result, ComPort, Model, BufferControl, Fields_Scan_Order,Newest_

First,Format)

The Result is a string variable that holds either the data to be output in its specified format or a message indicating there are no data to output to the transmitter. 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. Data formats and transmission durations (p. 24) discusses the Format options.

The GOESField() instruction has the following syntax:

GOESField(NumVals, Decimation, Precision, Width, SHEF)

The NumVals is the number of historical values of the field to output. For Decimation, enter 1 to output every value, enter 2 to output every other value, etc. Width specifies the number of characters in the field. Use empty quotes ("") for SHEFif no SHEF code is specified.

An example of using the the GOESTable() and GOESField() instructions follows:

DataTable (ST_DATA, TRUE, -1)

DataInterval(0, 15, Min, 4) GOESTable (st_table_results, COMRS232, 3, 0, TRUE, TRUE, 3) GOESField (4, 1, 3, 6, "") Sample (1, battery_voltage, IEEE4) GOESField (4, 1, 3, 6, "") Sample (1, panel_temperature, IEEE4)

EndTable

In the main portion of the program, settings are written using SetSetting() instruction with the following the syntax:

SetSetting ( "FieldName", Value )

The FieldName must be enclosed in quotes as shown. The following example instruction sets the port used to communicate with the TX325 to the RS-232 port:

SetSetting(“GOESComPort”, COMRS232)

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

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SlowSequence section of the program. Table 7-4 (p. 16) provides the TX325 settings that can

be set and read. Table 7-5 (p. 17) provides the read-only settings.

A downloadable example program is available at: www.campbellsci.com/downloads/tx325-

example-program-granite-cr6-cr1000x-cr300.

7.6.1 Read and write settings

Table 7-4: Read and write TX325 settings

Field Name Description

GOESComPort

GOESEnabled

GOESMsgWindow

GOESPlatformID

GOESRTBaudRate

GOESRTChannel

GOESRTInterval

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), the data logger ignores all other GOES settings. A value of 1 enables the setting.

Length, in seconds, of the assigned self-timed transmission window assigned by NESDIS. Valid entries are 1 to 110 s.

8-digit hexadecimal identification number assigned by NESDIS. Value is a string.

Baud rate for the random transmissions. Valid settings are 100, 300, or

1200. The baud rate must match the user's NESDIS-channel assignment.

Channel used for the random transmission assigned by NESDIS. Valid channel numbers are 0 through 566. The default value of 0 disables random transmissions.

Average time between random transmissions. The value is a string entered in the format of “Hours:Minutes:Seconds”. Typically, the assigned interval is in hours, so the minutes and seconds parameters are left at 0. For example, “01:00:00” setups up an hourly interval. Maximum interval is 24 hours; minimum interval is 1 minute.

GOESSTBaudRate

GOESSTChannel

Baud rate for self-timed transmissions. Valid settings are 300 or 1200. The baud rate must match the user's NESDIS-channel assignment.

Channel used for the self-timed transmission assigned by NESDIS. Valid channel numbers are 0 through 566. The default value of 0 disables the self-timed transmissions.

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Table 7-4: Read and write TX325 settings

Field Name Description

Time between self-timed transmissions. The value is a string entered in the format of "Days:Hours:Minutes:Seconds". Typically, the assigned

GOESSTInterval

GOESSTOffset

interval is in hours, so the days, minutes and seconds parameters are left at 0. For example, "00:01:00:00" sets up an hourly interval. Maximum interval is 14 days; minimum interval is 1 minute.

Time after midnight for the first self-timed transmission as assigned by NESDIS. The value is a string entered in the format of "Hours:Minutes:Seconds". Typically, only hours and minutes are used, and seconds are 0, unless the transmission window is less than 60 seconds. Maximum offset is 23:59:59. A value 0 results in no offset.

GOESRepeatCount

Number of times within the random transmit interval that the TX325 will transmit the message data. Valid entries are 1 to 3.

7.6.2 Read-only settings

Table 7-5: Read-only TX325 settings

FieldName Description

Current ID programmed into the radio. The ID isn’t

GOESid

GOESdateTime

GOESversion

GOESCurrentbattery

GOESCurrenttemperature

GOESbatteryBeforeTx

programmed into the radio until right before a radio transmission starts.

Current date and time (UTC) of the TX325 radio. Value is a string.

Current radio firmware version. Value is a string.

Battery voltage in VDC.

Current radio temperature in degrees Celsius.

Battery voltage of the radio just prior to its last transmission.

GOEStemperatureBeforeTx

GOESbatteryDuringTx

GOESLatitude

GOESLongitude

Radio temperature before the last transmission.

Radio-battery voltage during the last transmission.

Latitude in decimal format of the GOES radio.

Longitude in decimal format of the GOES radio.

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Table 7-5: Read-only TX325 settings

FieldName Description

GOESAltitude

GOESTimeLastGPSPosition

GOESNumberOfMissedGPS

GOESTimeLastMissedGPSFix

GOESGPSAcquisitionStatus

GOESGPSAntennaStatus

Altitude of the GOES radio in meters.

Date and time (UTC) of the last GPS position fix. Value is a string.

Number of times the radio has failed to get a GPS fix.

Last date and time (UTC) that the radio failed to get a GPS fix. Value is a string.

Acquisition status of the radio GPS. 0 = valid GPS fix 1 = no GPS position fix, no GPS satellites in view 8 = no GPS position fix, no usable GPS satellites in view 9 = no GPS position fix, one usable GPS satellite in view 10 = no GPS position fix, two usable GPS satellites in view 11 = no GPS position fix, three usable GPS satellites in view

Status of the GPS antenna. 0 = GPS antenna is working 16 = GPS antenna is not connected 48 = GPS antenna is shorted

GOESFailSafeIndicator

GOESDurationOfTransmit

GOESForwardTxPower

GOESReflectedRfPower

GOESVSWR

GOESLastTxControlFlags

GOESLastTxStartTime

GOESLastTxChannel

Radio failsafe status. 1 = Failsafe has been tripped 0 = Radio is OK and Failsafe has not been tripped

Duration of the last transmission of the GOES radio in milliseconds.

Forward RF power of the transmitter in watts.

Reflected RF power of the transmitter in watts.

Voltage standing wave ratio (SWR) of the radio.

Control flags used in the last transmission.

Start time (UTC) of the last radio transmission. Value is a string.

Channel number used during the last radio transmission.

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Table 7-5: Read-only TX325 settings

FieldName Description

GOESLastTypeCode

GOESLastDatelength

GOESLastHDRFlagWord

GOESTxResultCode

GOESCurrentTxState

Type of transmission used during the last radio transmission.

Number of bytes in the last radio transmission.

HDR flag word used in the last radio transmission.

Status of the last radio transmission. 0 = Last transmission was OK 1 = Transmission aborted, radio battery voltage is too low 2 = Transmission aborted, radio PLL lock failure 3 = Transmission aborted, radio flash is corrupt

Current state of the radio. 0 = Idle 1 = Transmission is in progress 2 = Post transmission failsafe wait is in progress

8. Troubleshooting

Issue: TX325 is not transmitting

First, check the power supply and make sure that the TX325 power supply voltage is at least

10.5VDC (see Specifications (p. 10)). 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 transmitter housing (FIGURE 8-1 (p. 20)).

CAUTION: A power cycle will not clear the fail safe mode.

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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.

If a fail safe condition occurs, the red Failsafe LED is on continuously; its RF output is disabled; and its microprocessor is reset (causing the transmitter to reboot). While in the fail safe mode, the transmitter can communicate normally with the data logger, but is unable to transmit again until the fail safe mode has been cleared.

8.1 Troubleshooting over-air transmissions

TX325 users within the GOES system can troubleshoot their over-the-air data transmissions by using one of the following websites:

l https://dcs1.noaa.gov/Account/FieldTest l https://dcs2.noaa.gov/Account/FieldTest l https://dcs3.noaa.gov/Account/FieldTest l https://dcs4.noaa.gov/Account/FieldTest

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These websites provide the raw data sent through the GOES satellite system but do not require a login, user name, nor password.

1. Type your eight-character DCP ADDRESS.

2. Type the number of hours you want the field test system to go back to.

3. Click RETRIEVE.

The PDT INFORMATION provides your assigned DCP address, channels, transmission times, and window length. Make sure your setting in your DCP match this information. Failure to do so will result in loss of data and transmitting over the top of other DCP scheduled slots and also will result in the loss of other user’s data.

The bottom table shows information that can help you determine the health of the DCP transmissions. This information includes signal quality (QUAL), transmission start time (CARRIER), and stop time(END).

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The DATA field provides the data transmitted through the GOES system. An extra character could be in front of the transmitted data message, indicating whether or not the GPS time synched (Table 8-1 (p. 22)). This character is added to the number of bytes (shown as LEN) that were in the data transmission.

Table 8-1: Characters indicating time sync

Character Data type

Space ASCII No

Double quote (") ASCII Yes

Apostrophe (') Binary No

Lower case b Binary Yes

Time synched since

last transmission

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Appendix A. Eligibility and getting onto the GOES system

U.S. federal, state, or local government agencies, or users sponsored by one of those agencies, may use GOES. Potential GOES users must apply for and be granted a System Use Agreement (SUA) by NESDIS, which is typically renewable every 5 years. Use the following procedure to acquire permission for getting onto the GOES system:

1. Follow the steps provided at: https://dcs2.noaa.gov to submit an application for GOES DCS SUA. Once submitted, the approving authorities will review the application and notify you within two weeks. If you are approved NESDIS will send you a Memorandum of Agreement (MOA).

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.

See https://dcs2.noaa.gov for more information.

TX325 Satellite Transmitter for GOES V2 23

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Appendix B. Data formats and transmission durations

Data transmissions are generally described as having an ASCII or pseudobinary format. The particular nature of how the data is formatted prior to sending the data over-the-air. The data order in those transmissions is determined by the content and organization of the DataTables() and execution of GOESTable() and GOESField(). Scan-order (interleaved) and channelorder data can be sent by using an ASCII or pseudobinary format with one of the native data logger data format options. The flexibility of CRBasic allows virtually any message type to match the decode system requirements.

B.1 ASCII data format

ASCII data formats are used to transmit data in plain readable text. This format is widely used for random or alert transmissions. They can be used for self-timed messages. Several standard formats are selectable within CRBasic. Formats not included can be easily formed using stringformatted data fields, allowing the content to be tailored to your application needs. Stringformatted data fields are limited to 13 characters for each field.

B.1.1 7-byte floating-point ASCII (GOESTable() format option 1)

The 7-byte floating-point ASCII data type is a fixed-width format with variable precision.

l Operating range of ±7999, depending on placement of decimal point (see Table B-1 (p.

25)).

l Variable precision of 0.001 to 1, depending on placement of decimal point (see Table B-1

(p. 25)).

l Precision (placement of decimal point) is automatically determined based on the

magnitude of the value (Table B-1 (p. 25)).

l Number are rounded to selected precision during conversion. For example, +12.345, will be

rounded to +12.35.

l Value is always 7 characters including a trailing comma.

l Value is always signed (+/-).

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l Leading zeros and trailing zeros are added to maintain the width (7 characters) of the value

transmitted.

l Value always has a trailing comma. This includes the last value sent.

l Valid data outside of operating range are set to –7999 or +7999, unless it is a NAN, +INF,

or -INF (see Table B-1 (p. 25)).

Table B-1: 7-byte floating-point ASCII data

Range Maximum precision Example ASCII output

±7.999 0.001 +1.200,

±79.99 0.01 +12.00,

±799.9 0.1 +120.0,

±7999 1 +1200.,

NAN1= –8190.,

+INF2= +8191.,

-INF2= -8191.,

Not A Number

Infinity

Example output (with 10 fields):

GoesTable() Fields_Scan_Order = FALSE, Newest_First=FALSE, Format = 1 GoesField() Decimation = 1

<CR><LF>-7994.,-7994.,+8191.,-8191.,-8190.,+8191.,-8191.,-

8190.,+13.10,+27.32,

GoesTable() Fields_Scan_Order = FALSE, Newest_First=FALSE, Format = 1 GoesField() Decimation = 4

<CR><LF>-7997.,-7997.,+8191.,-8191.,-8190.,+8191.,-8191.,-

8190.,+13.15,+26.08, <CR><LF>-7996.,-7996.,+8191.,-8191.,-8190.,+8191.,-8191.,-

8190.,+13.16,+26.04, <CR><LF>-7995.,-7995.,+8191.,-8191.,-8190.,+8191.,-8191.,-

8190.,+13.17,+26.03, <CR><LF>-7994.,-7994.,+8191.,-8191.,-8190.,+8191.,-8191.,-

8190.,+13.19,+26.18,

TX325 Satellite Transmitter for GOES V2 25

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GoesTable() Fields_Scan_Order = True, Newest_First=FALSE, Format = 1 GoesField() Decimation = 1

<CR><LF> -7994., <CR><LF> -7994., <CR><LF> +8191., <CR><LF> -8191., <CR><LF> -8190., <CR><LF> +8191., <CR><LF> -8191., <CR><LF> -8190., <CR><LF> +13.13, <CR><LF> +27.72,

GoesTable() Fields_Scan_Order = True, Newest_First=FALSE, Format = 1 GoesField() Decimation = 4

<CR><LF>-7997.,-7996.,-7995.,-7994., <CR><LF>-7997.,-7996.,-7995.,-7994., <CR><LF>+8191.,+8191.,+8191.,+8191., <CR><LF>-8191.,-8191.,-8191.,-8191., <CR><LF>-8190.,-8190.,-8190.,-8190. <CR><LF>,+8191.,+8191.,+8191.,+8191., <CR><LF>-8191.,-8191.,-8191.,-8191., <CR><LF>-8190.,-8190.,-8190.,-8190., <CR><LF>+13.12,+13.12,+13.12,+13.11, <CR><LF>+27.59,+27.59,+27.59,+27.60,

B.1.2 ASCII table space (GOESTable() format option 2)

This option provides a tabular format. Columns are fixed width, according to the field format, and are space delimited. Lines are <CR><LF> delimited. You can send either the newest or oldest data first. A <CR><LF> is added at the end of the final line sent.

l NANs, +INFs, -INFs, and missing values show as forward slashes (/) in the output.

l Each line contains all the values listed in GOESTable() that have been set with

GOESField() and are sent in the order they are listed in the data table if Scan_Order

is set to False.

l Each line has all data from a single sensor if Scan_Order is set to True.

l SHEF Codes can be added as headers or at the beginning of lines using GOESField()

option SHEF.

l Value has a fixed width (Table B-2 (p. 27)).

l Value has a fixed precision (Table B-2 (p. 27)).

l Value only has a leading sign when negative (–).

TX325 Satellite Transmitter for GOES V2 26

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l Data outside of operating range will be set to the minimum or maximum of the range.

l Value always has a trailing space character.

Table B-2: ASCII format, width, precision, and range

Format Width Precision Range

Example ASCII output

containing two values

xxx 3 1 –99 to 999 012 -34

xxxxx 5 1 –9999 to 99999 00012 -0034

xxx.x 5 0.1 –99.9 to 999.9 001.2 -03.4

xx.xx 5 0.01 –9.99 to 99.99 00.12 -0.34

x.xxx 5 0.001 –.999 to 9.999 0.012 -.034

Example outputs (with 10 fields):

GoesTable() Fields_Scan_Order = FALSE, Newest_First=FALSE, Format = 2 GoesField() Decimation = 1, Precision = 3, Width = 4

GoesTable() Fields_Scan_Order = FALSE, Newest_First=FALSE, Format = 2 GoesField() Decimation = 4, Precision = 3, Width = 5

GoesTable() Fields_Scan_Order = TRUE, Newest_First=FALSE, Format = 2 GoesField() Decimation = 1, Precision = 3, Width = 5

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GoesTable() Fields_Scan_Order = TRUE, Newest_First=FALSE, Format = 2 GoesField() Decimation = 4, Precision = 3, Width = 5

GoesTable() Fields_Scan_Order = FALSE, Newest_First=FALSE, Format = 2 GoesField() Decimation = 1, Precision = 3, Width = 5, SHEF set to HG, TA, VB

GoesTable() Fields_Scan_Order = FALSE, Newest_First=FALSE, Format = 2 GoesField() Decimation = 4, Precision = 3, Width = 5, SHEF set to HG, TA, VB

GoesTable() Fields_Scan_Order = TRUE, Newest_First=FALSE, Format = 2 GoesField() Decimation = 1, Precision = 3, Width = 5, SHEF set to HG, TA, VB

GoesTable() Fields_Scan_Order = TRUE, Newest_First=FALSE, Format = 2 GoesField() Decimation = 4, Precision = 3, Width = 5, SHEF set to HG, TA, VB

GoesTable() Fields_Scan_Order = TRUE, Newest_First=FALSE, Format = 2 GoesField() Decimation = 4, Precision = 3, Width = 5, SHEF set to HG, TA, VB

NOTE: To get a single battery voltage (or other additional data), set GoesField() Decimation = 1 for just the battery_voltage (or other) value in the GOESTable().

TX325 Satellite Transmitter for GOES V2 28

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<CR><LF>HG -9.70 -9.69 -9.68 -9.67 <CR><LF>TA 13.11 13.13 13.10 13.13 <CR><LF>VB 26.82 26.82 26.82 26.82 <CR><LF>BATTERY 13.13 <CR><LF>DATE 200336 <CR><LF>TIME 101500<CR><LF>

B.1.3 ASCII table space, comma separated (GOESTable() format option 3)

This option provides a tabular format. Columns are fixed width, according to the field format, and are comma (,) delimited. Lines are <CR><LF> delimited. You can send either the newest or oldest data first. A <CR><LF> is added at the end of the final line sent.

l NANs, +INFs, -INFs, and missing values show as forward slashes (/) in the output.

l Each line contains all the values listed in GOESTable() that have been set with

GOESField() and are sent in the order they are listed in the data table if Scan_Order

is set to False.

l Each line has all data from a single sensor if Scan_Order is set to True.

l SHEF Codes can be added as headers or at the beginning of lines using GOESField()

option SHEF.

l Value has a fixed width (Table B-2 (p. 27)).

l Value has a fixed precision (Table B-2 (p. 27)).

l Value only has a leading sign when negative (–).

l Data outside of operating range will be set to the minimum or maximum of the range.

l Value always has a trailing comma (,).

Example outputs (with 10 fields):

GoesTable() Fields_Scan_Order = FALSE, Newest_First=FALSE, Format = 3 GoesField() Decimation = 1, Precision = 3, Width = 4

GoesTable() Fields_Scan_Order = FALSE, Newest_First=FALSE, Format = 3 GoesField() Decimation = 4, Precision = 3, Width = 5

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GoesTable() Fields_Scan_Order = TRUE, Newest_First=FALSE, Format = 3 GoesField() Decimation = 1, Precision = 3, Width = 5

GoesTable() Fields_Scan_Order = TRUE, Newest_First=FALSE, Format = 3 GoesField() Decimation = 4, Precision = 3, Width = 5

GoesTable() Fields_Scan_Order = FALSE, Newest_First=FALSE, Format = 3 GoesField() Decimation = 1, Precision = 3, Width = 5, SHEF set to HG, TA, VB

GoesTable() Fields_Scan_Order = FALSE, Newest_First=FALSE, Format = 3 GoesField() Decimation = 4, Precision = 3, Width = 5, SHEF set to HG, TA, VB

GoesTable() Fields_Scan_Order = TRUE, Newest_First=FALSE, Format = 3 GoesField() Decimation = 1, Precision = 3, Width = 5, SHEF set to HG, TA, VB

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GoesTable() Fields_Scan_Order = TRUE, Newest_First=FALSE, Format = 3 GoesField() Decimation = 4, Precision = 3, Width = 5, SHEF set to HG, TA, VB

GoesTable() Fields_Scan_Order = TRUE, Newest_First=FALSE, Format = 3 GoesField() Decimation = 4, Precision = 3, Width = 5, SHEF set to HG, TA, VB

NOTE: To get a single battery voltage (or other additional data), set GoesField() Decimation = 1 for just the battery_voltage (or other) value in the GOESTable().

<CR><LF>HG,-9.70,-9.69,-9.68,-9.67 <CR><LF>TA,13.11,13.13,13.10,13.13 <CR><LF>VB,26.82,26.82,26.82,26.82 <CR><LF>BATTERY,13.13 <CR><LF>DATE,200336 <CR><LF>TIME,101500<CR><LF>

B.1.4 Line SHEF (Standard Hydrological Exchange Format) (GOESTable() format option 6)

ASCII output using standardized SHEF codes in a format that is human readable.

l NANs, +INFs, -INFs, and missing values show as forward slashes (/) in the output.

l LABEL is the SHEF code (two character) parameter. Refer to

https://dcs1.noaa.gov/documents/SHEF%20Codes.pdf for details on SHEF codes.

l OFFSET is how long ago the sensor reading was made and stored in the GOESTable()

data table and is reported in number of minutes.

l INTERVAL is how often the measurement is made. This corresponds to DataInterval()

of the GOES data table or the scan interval if DataInterval() is not used.

l DATA is the data that is stored in the GOES table.

l APPENDED OPTIONS refers to data that can be appended to the transmission.

l SHEF Codes can be added as headers or at the beginning of lines using GOESField()

option SHEF.

l Value has a fixed width (Table B-2 (p. 27)).

l Value has a fixed precision (Table B-2 (p. 27)).

l Value only has a leading sign when negative (–).

l Data outside of operating range will be set to the minimum or maximum of the range.

TX325 Satellite Transmitter for GOES V2 31

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Format of data transmitted:

: <LABEL1> <OFFSET> #<INTERVAL> <DATA1> <DATA1> ... <DATA1)> : <LABEL2> <OFFSET> #<INTERVAL> <DATA2> <DATA2> ... <DATA2> ... : <LABEL(N)> <OFFSET> #<INTERVAL> <DATA(N)> <DATA(N)> ... <DATA(N)>

Example output with explanation:

GoesTable() Fields_Scan_Order = TRUE, Newest_First=FALSE, Format = 6 GoesField() Decimation = 4, Precision = 3, Width = 5, SHEF set to VB and TA

(see Table B-3 (p. 32))

Table B-3: Example SHEF output with descriptions

Output Description

:VB SHEF Code VB (Voltage – Battery)

8 Reading is 8 minutes old (happened 8 minutes prior to transmission)

#15 15-minutes measurement interval

13.15 Most recent sensor or measurement reading

13.13 Sensor or measurement reading taken 15 minutes prior to transmission

13.18 Sensor or measurement reading taken 30 minutes prior to transmission

13.19 Sensor or measurement reading taken 45 minutes prior to transmission

:TA SHEF Code TA (Temperature, air, dry bulb)

8 Reading is 8 minutes old (happened 8 minutes prior to transmission)

#15 15-minutes measurement interval

26.76 Most recent sensor or measurement reading

26.76 Sensor or measurement reading taken 15 minutes prior to transmission

26.85 Sensor or measurement reading taken 30 minutes prior to transmission

26.98 Sensor or measurement reading taken 45 minutes prior to transmission

B.2 Pseudobinary data formats

The pseudobinary data format is a modified-ASCII format that uses the lower 6 bits of each 8-bit data character to represent part of a binary message. To encode a number, its binary form is broken into groups of 6 bits. Each group is placed into the lower 6 bits of a respective byte. The

TX325 Satellite Transmitter for GOES V2 32

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number 64 is added to each byte to set the seventh bit. Binary numbers are transmitted MSB (most significant bit) first.

Pseudobinary formats are preferred for GOES and Meteosat/EUMETSAT self-timed transmissions because users can include more data in the GOES message. This allows more data to be transmitted in a specific window of transmission time.

NOTE: These messages are not human readable and need to be decoded by computer software or by using custom decoding tables.

Because only 6 bits are used in each byte, the range that a byte or series of bytes can represent is diminished (Table B-4 (p. 33)).

Table B-4: Pseudobinary ranges

Pseudobinary 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

3-byte encoded unsigned integer 0 to +262143

3-byte encoded signed integer –131072 to +131071

4-byte encoded unsigned integer 0 to +16777215

4-byte encoded signed integer –8388608 to +8388607

B.2.1 Campbell Scientific FP2 data

The FP2 data format uses 16 bits to represent a variable-precision floating point number. FP2 has a total range of -7999 to 7999 and variable precision of 0.001 to 1. It also has the ability to signal +/– INF and NAN, most commonly used to indicate a computational or measurement error.

Table B-5 (p. 34)) shows the numeric ranges and precision; Table B-6 (p. 34) describes the bits,

and Table B-7 (p. 34) provides bit usage in calculating a finished value.

TX325 Satellite Transmitter for GOES V2 33

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Table B-5: FP2 range and maximum precision

Range

Maximum

precision

–7.999 to 7.999 0.001 11

–79.99 to 79.99 0.01 10

–799.9 to 799.9 0.1 01

–7,999 to 7,999 1 00

Table B-6: Bit description

Name Bit Description

Sign (S) 16 (MSB)

Exponent (E) 15 and 14 Specifies the magnitude of the negative decimal exponent.

Mantissa (M) 13 to 0 (LSB) Specifies the magnitude of the 13-bit mantissa, 0 to 8191

b15 and b14

bit pattern

Specifies the sign of the value.

0 = positive, 1 = negative.

Table B-7: Calculation of finished value

Sign (S) Exponent (E) Mantissa (M) FP2 value equals

0 00 8191 + INF

1 00 8191 – INF

1 00 8190 NAN

0 or 1 00 or 01 or 10 0 to 7999 (–1 ^ S) × (10 ^ –E) × M

When transmitted in a pseudobinary format, the 16 bits are encoded as follows. Bits 16 through 13 are the least significant four bits of the first byte, bits 12 through 7 are the least significant six bits of the second byte, and the last six bits are the least significant bits of the last byte. The following tables are examples of encoding values.

TX325 Satellite Transmitter for GOES V2 34

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Table B-8: Encoding of 1234

Character 1 = @ Character 2 = S Character 3 = R

Sign Exponent Mantissa Mantissa Mantissa

p 1 0 0 b16 b15 b14 b13 p 1 b12 b11 b10 b9 b8 b7 p 1 b6 b5 b4 b3 b2 b1

0 1 0 0 0 0 0 0 0 1 0 1 0 0 1 1 0 1 0 1 0 0 1 0

Table B-9: Encoding of 1.234

Character 1 = F Character 2 = S Character 3 = R

Sign Exponent Mantissa Mantissa Mantissa

p 1 0 0 b16 b15 b14 b13 p 1 b12 b11 b10 b9 b8 b7 p 1 b6 b5 b4 b3 b2 b1

0 1 0 0 0 1 1 0 0 1 0 1 0 0 1 1 0 1 0 1 0 0 1 0

Table B-10: Encoding of 12.34

Character 1 = D Character 2 = S Character 3 = R

Sign Exponent Mantissa Mantissa Mantissa

p 1 0 0 b16 b15 b14 b13 p 1 b12 b11 b10 b9 b8 b7 p 1 b6 b5 b4 b3 b2 b1

0 1 0 0 0 1 0 0 0 1 0 1 0 0 1 1 0 1 0 1 0 0 1 0

Table B-11: Encoding of 123.4

Character 1 = B Character 2 = S Character 3 = R

Sign Exponent Mantissa Mantissa Mantissa

p 1 0 0 b16 b15 b14 b13 p 1 b12 b11 b10 b9 b8 b7 p 1 b6 b5 b4 b3 b2 b1

0 1 0 0 0 0 1 0 0 1 0 1 0 0 1 1 0 1 0 1 0 0 1 0

TX325 Satellite Transmitter for GOES V2 35

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Table B-12: Encoding of 0.123

Character 1 = F Character 2 = A Character 3 = {

Sign Exponent Mantissa Mantissa Mantissa

p 1 0 0 b16 b15 b14 b13 p 1 b12 b11 b10 b9 b8 b7 p 1 b6 b5 b4 b3 b2 b1

0 1 0 0 0 1 1 0 0 1 0 0 0 0 0 1 0 1 1 1 1 0 1 1

Table B-13: Encoding of -1234

Character 1 = H Character 2 = S Character 3 = R

Sign Exponent Mantissa Mantissa Mantissa

p 1 0 0 b16 b15 b14 b13 p 1 b12 b11 b10 b9 b8 b7 p 1 b6 b5 b4 b3 b2 b1

0 1 0 0 1 0 0 0 0 1 0 1 0 0 1 1 0 1 0 1 0 0 1 0

Table B-14: Encoding of -1.234

Character 1 = N Character 2 = S Character 3 = R

Sign Exponent Mantissa Mantissa Mantissa

p 1 0 0 b16 b15 b14 b13 p 1 b12 b11 b10 b9 b8 b7 p 1 b6 b5 b4 b3 b2 b1

0 1 0 0 1 1 1 0 0 1 0 1 0 0 1 1 0 1 0 1 0 0 1 0

Table B-15: Encoding of -12.34

Character 1 = L Character 2 = S Character 3 = R

Sign Exponent Mantissa Mantissa Mantissa

p 1 0 0 b16 b15 b14 b13 p 1 b12 b11 b10 b9 b8 b7 p 1 b6 b5 b4 b3 b2 b1

0 1 0 0 1 1 0 0 0 1 0 1 0 0 1 1 0 1 0 1 0 0 1 0

TX325 Satellite Transmitter for GOES V2 36

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Table B-16: Encoding of -123.4

Character 1 = J Character 2 = S Character 3 = R

Sign Exponent Mantissa Mantissa Mantissa

p 1 0 0 b16 b15 b14 b13 p 1 b12 b11 b10 b9 b8 b7 p 1 b6 b5 b4 b3 b2 b1

0 1 0 0 1 0 1 0 0 1 0 1 0 0 1 1 0 1 0 1 0 0 1 0

Table B-17: Encoding of -0.123

Character 1 = N Character 2 = A Character 3 = {

Sign Exponent Mantissa Mantissa Mantissa

p 1 0 0 b16 b15 b14 b13 p 1 b12 b11 b10 b9 b8 b7 p 1 b6 b5 b4 b3 b2 b1

0 1 0 0 1 1 1 0 0 1 0 0 0 0 0 1 0 1 1 1 1 0 1 1

Table B-18: Encoding of INF

Character 1 = A Character 2 = ? Character 3 = ?

Sign Exponent Mantissa Mantissa Mantissa

p 1 0 0 b16 b15 b14 b13 p 1 b12 b11 b10 b9 b8 b7 p 1 b6 b5 b4 b3 b2 b1

0 1 0 0 0 0 0 1 0 0 1 1 1 1 1 1 0 0 1 1 1 1 1 1

Table B-19: Encoding of -INF

Character 1 = I Character 2 = ? Character 3 = ?

Sign Exponent Mantissa Mantissa Mantissa

p 1 0 0 b16 b15 b14 b13 p 1 b12 b11 b10 b9 b8 b7 p 1 b6 b5 b4 b3 b2 b1

0 1 0 0 1 0 0 1 0 0 1 1 1 1 1 1 0 0 1 1 1 1 1 1

TX325 Satellite Transmitter for GOES V2 37

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Table B-20: Encoding of NAN

Character 1 = I Character 2 = ? Character 3 = ~

Sign Exponent Mantissa Mantissa Mantissa

p 1 0 0 b16 b15 b14 b13 p 1 b12 b11 b10 b9 b8 b7 p 1 b6 b5 b4 b3 b2 b1

0 1 0 0 1 0 0 1 0 0 1 1 1 1 1 1 0 0 1 1 1 1 1 0

B.2.2 Pseudobinary

Pseudobinary or 18-bit integer data format is used to transmit a signed or unsigned integer. The 18 bits are encoded across 3 bytes. When signed, the value is encoded using a two-complement representation. As an integer cannot directly represent a fractional number, measurements are often scaled before storing to the GOES data table. For example, a water-level surface elevation of 123.45 ft can be multiplied by 100 to get an integer of 12345. This integer is stored for transmission with the encoding shown in Table B-21 (p. 38).

Table B-21: Example encoding of water level surface elevation value of 12345

Character 1 = C Character 2 = @ Character 3 = y

p 1 b18 b17 b16 b15 b14 b13 p 1 b12 b11 b10 b9 b8 b7 p 1 b6 b5 b4 b3 b2 b1

0 1 0 0 0 0 1 1 0 1 0 0 0 0 0 0 0 1 1 1 1 0 0 1

B.2.3 Additional pseudobinary representations

Other pseudobinary representations, such as 6, 12, and 24 bit integers, can be formed and transmitted using CRBasic.

B.3 Transmission durations

Table B-22 (p. 39) provides the transmission durations, calculated from the number of bytes in a

message. Table B-23 (p. 39) provides the maximum data bytes for an assigned time slot duration.

TX325 Satellite Transmitter for GOES V2 38

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Table B-22: Calculating transmission duration for GOES 300/1200 bps messages

Transmit type

(where N = number of data bytes in a message)

Self-timed, 300 bps (137 + (N × 4))/150

Random, 300 bps (137 + (N × 4))/150

Self-timed, 1200 bps (223 + (N × 4))/600

Random, 1200 bps (223 + (N × 4))/600

Table B-23: GOES self-timed-message maximum data bytes and assigned time-slot duration

GOES 300 bps

Assigned time-slot

maximum data per message

duration (seconds)

(bytes)

5 153 694

10 340 1444

15 528 2194

Transmission duration (seconds)

GOES 1200 bps

maximum data per message

(bytes)

20 715 2944

25 903 3694

30 1090 4444

35 1278 5194

40 1465 5944

45 1653 6694

50 1840 7444

55 2028 8194

60 2215 8944

TX325 Satellite Transmitter for GOES V2 39

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Appendix C. Compliance

Certificate of Registration

This certifies that the Quality Management System of

Signal Engineering, Inc.

6370 Lusk Blvd., Suite F206

San Diego,, California, 92121, United States

has been assessed by NSF-ISR and found to be in conformance to the following standard(s):

ISO 9001:2015

Scope of Registration:

Engineering Design and Light Manufacturing of Electronic/Radio Communications Systems.

Carl Blazik, Director, Technical Operations & Business Units, NSF-ISR, Ltd.

Certificate Number: C0195647-IS3 Certificate Issue Date: 24-APR-2018 Registration Date: 14-MAY-2017 Expiration Date *: 12-MAY-2020

documents and certificates

Compliance documents include the ISO certificate (FIGURE C-1 (p. 40)) and the GOES V2 certificate (FIGURE C-2 (p. 41)). The TX325 EU Declaration of Conformity is available at:

www.campbellsci.com/tx325.

FIGURE C-1. ISO certificate

TX325 Satellite Transmitter for GOES V2 40

Page 44

National

Environmental

Satellite,

Data,

and

Information

Service

Certificate

Number

12142012

Certifies that

Sianal Enaineerina. Inc.

Model

OmniSat·3

Has

been

type

tested

and

meets

the

requirements

for

use

the

Geo-stationary

Operational 'Environmental

Satellite

Data Collection

System.

Condition

Ifdesign changes or modifications are made that affect its technical performance as specified in the certification standards for this

type

equipment, recertification

this model shall be required before placing

operation.

accordance with

Ver5

ion

2.0 GOES

DCPR Certification

Standards

300bps

and

1200bps

data

rates

i>&

Ortice

Systc

1 D. '

vc/opmcnt

[)~7-r,

j I .

lJ-/

J-lJ/I2--

Signature

Date

r/O

' "\ .

IFICATIO

Ie( . .

010

SET CERT

Form

83-1

(;OEs

.S.

Department

Commerce

NOA/

...

(6-HO)

tiona I

Oceanic and Atmospheric

Administrati:l

FIGURE C-2. GOES V2 certificate

TX325 Satellite Transmitter for GOES V2 41

Page 45

Limited warranty

Products manufactured by Campbell Scientific are warranted by Campbell Scientific 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 on the corresponding product webpage. See Product Details on the Ordering Information pages at www.campbellsci.com. Other manufacturer's products, that are resold by Campbell Scientific, are warranted only to the limits extended by the original manufacturer.

Refer to www.campbellsci.com/terms#warranty for more information.

CAMPBELL SCIENTIFIC EXPRESSLY DISCLAIMS AND EXCLUDES ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Campbell Scientific hereby disclaims, to the fullest extent allowed by applicable law, any and all warranties and conditions with respect to the Products, whether express, implied or statutory, other than those expressly provided herein.

Page 46

Assistance

Products may not be returned without prior authorization.

Products shipped to Campbell Scientific require a Returned Materials Authorization (RMA) or Repair Reference number and must be clean and uncontaminated by harmful substances, such as hazardous materials, chemicals, insects, and pests. Please complete the required forms prior to shipping equipment.

Campbell Scientific regional offices handle repairs for customers within their territories. Please see the back page for the Global Sales and Support Network or visit

www.campbellsci.com/contact to determine which Campbell Scientific office serves your country.

To obtain a Returned Materials Authorization or Repair Reference number, contact your CAMPBELL SCIENTIFIC regional office. Please write the issued number clearly on the outside of the shipping container and ship as directed.

For all returns, the customer must provide a “Statement of Product Cleanliness and Decontamination” or “Declaration of Hazardous Material and Decontamination” form and comply with the requirements specified in it. The form is available from your CAMPBELL SCIENTIFIC regional office. Campbell Scientific is unable to process any returns until we receive this statement. If the statement is not received within three days of product receipt or is incomplete, the product will be returned to the customer at the customer’s expense. 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 47

Safety

DANGER — MANY HAZARDS ARE ASSOCIATED WITH INSTALLING, USING, MAINTAINING, AND WORKING ON OR AROUND TRIPODS, TOWERS, AND ANY ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS, CROSSARMS, ENCLOSURES, ANTENNAS, ETC. FAILURE TO PROPERLY AND COMPLETELY ASSEMBLE, INSTALL, OPERATE, USE, AND MAINTAIN TRIPODS, TOWERS, AND ATTACHMENTS, AND FAILURE TO HEED WARNINGS, INCREASES THE RISK OF DEATH, ACCIDENT, SERIOUS INJURY, PROPERTY DAMAGE, AND PRODUCT FAILURE. TAKE ALL REASONABLE PRECAUTIONS TO AVOID THESE HAZARDS. CHECK WITH YOUR ORGANIZATION'S SAFETY COORDINATOR (OR POLICY) FOR PROCEDURES AND REQUIRED PROTECTIVE EQUIPMENT PRIOR TO PERFORMING ANY WORK.

Use tripods, towers, and attachments to tripods and towers only for purposes for which they are designed. Do not exceed design limits. Be familiar and comply with all instructions provided in product manuals. Manuals are available at www.campbellsci.com. You are responsible for conformance with governing codes and regulations, including safety regulations, and the integrity and location of structures or land to which towers, tripods, and any attachments are attached. Installation sites should be evaluated and approved by a qualified engineer. If questions or concerns arise regarding installation, use, or maintenance of tripods, towers, attachments, or electrical connections, consult with a licensed and qualified engineer or electrician.

General

l Protect from over-voltage. l Protect electrical equipment from water. l Protect from electrostatic discharge (ESD). l Protect from lightning. l Prior to performing site or installation work, obtain required approvals and permits. Comply with all governing structure-height

regulations.

l Use only qualified personnel for installation, use, and maintenance of tripods and towers, and any attachments to tripods and

towers. The use of licensed and qualified contractors is highly recommended.

l Read all applicable instructions carefully and understand procedures thoroughly before beginning work. l Wear a hardhat and eye protection, and take other appropriate safety precautions while working on or around tripods and towers. l Do not climb tripods or towers at any time, and prohibit climbing by other persons. Take reasonable precautions to secure tripod

and tower sites from trespassers.

l Use only manufacturer recommended parts, materials, and tools.

Utility and Electrical

l You can be killed or sustain serious bodily injury if the tripod, tower, or attachments you are installing, constructing, using, or

maintaining, or a tool, stake, or anchor, come in contact with overhead or underground utility lines.

l Maintain a distance of at least one-and-one-half times structure height, 6 meters (20 feet), or the distance required by applicable

law, whichever is greater, between overhead utility lines and the structure (tripod, tower, attachments, or tools).

l Prior to performing site or installation work, inform all utility companies and have all underground utilities marked. l Comply with all electrical codes. Electrical equipment and related grounding devices should be installed by a licensed and qualified

electrician.

l Only use power sources approved for use in the country of installation to power Campbell Scientific devices.

Elevated Work and Weather

l Exercise extreme caution when performing elevated work. l Use appropriate equipment and safety practices. l During installation and maintenance, keep tower and tripod sites clear of un-trained or non-essential personnel. Take precautions to

prevent elevated tools and objects from dropping.

l Do not perform any work in inclement weather, including wind, rain, snow, lightning, etc.

Maintenance

l Periodically (at least yearly) check for wear and damage, including corrosion, stress cracks, frayed cables, loose cable clamps, cable

tightness, etc. and take necessary corrective actions.

l Periodically (at least yearly) check electrical ground connections.

Internal Battery

l Be aware of fire, explosion, and severe-burn hazards. l Misuse or improper installation of the internal lithium battery can cause severe injury. l Do not recharge, disassemble, heat above 100 °C (212 °F), solder directly to the cell, incinerate, or expose contents to water. Dispose

of spent batteries properly.

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 ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS, CROSSARMS, ENCLOSURES, ANTENNAS, ETC.

Page 48

Campbell Scientific regional offices

Australia

Location: Phone: Email: Website:

Brazil

Location: Phone: Email: Website:

Canada

Location: Phone: Email: Website:

China

Location: Phone: Email: Website:

Garbutt, QLD Australia

61.7.4401.7700 [email protected] www.campbellsci.com.au

São Paulo, SP Brazil

11.3732.3399 [email protected] www.campbellsci.com.br

Edmonton, AB Canada

780.454.2505 [email protected] www.campbellsci.ca

Beijing, P. R. China

86.10.6561.0080 [email protected] www.campbellsci.com.cn

France

Location: Phone: Email: Website:

Germany

Location: Phone: Email: Website:

India

Location: Phone: Email: Website:

South Africa

Location: Phone: Email: Website:

Vincennes, France

0033.0.1.56.45.15.20 [email protected] www.campbellsci.fr

Bremen, Germany

49.0.421.460974.0 [email protected] www.campbellsci.de

New Delhi, DL India

91.11.46500481.482 [email protected] www.campbellsci.in

Stellenbosch, South Africa

27.21.8809960 [email protected] www.campbellsci.co.za

Thailand

Location: Phone: Email: Website:

USA

Location: Phone: Email: Website:

Bangkok, Thailand

66.2.719.3399 [email protected] www.campbellsci.asia

Shepshed, Loughborough, UK

44.0.1509.601141 [email protected] www.campbellsci.co.uk

Logan, UT USA

435.227.9120 [email protected] www.campbellsci.com

Costa Rica

Location: Phone: Email: Website:

San Pedro, Costa Rica

506.2280.1564 [email protected] www.campbellsci.cc

Spain

Location: Phone: Email: Website:

Barcelona, Spain

34.93.2323938 [email protected] www.campbellsci.es

Campbell Scientific TX325 User manual

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

7.6.1 Read and write settings

7.6.2 Read-only settings

8. Troubleshooting

8.1 Troubleshooting over-air transmissions

Appendix A. Eligibility and getting onto the GOES system

Appendix B. Data formats and transmission durations

B.1 ASCII data format

B.1.1 7-byte floating-point ASCII (GOESTable() format option 1)

B.1.2 ASCII table space (GOESTable() format option 2)

B.1.3 ASCII table space, comma separated (GOESTable() format option 3)

B.1.4 Line SHEF (Standard Hydrological Exchange Format) (GOESTable() format option 6)

B.2 Pseudobinary data formats

B.2.1 Campbell Scientific FP2 data

B.2.2 Pseudobinary

B.2.3 Additional pseudobinary representations

B.3 Transmission durations

Limited warranty

Assistance

Safety

Campbell Scientific regional offices