Radar Series User Manual
Contents
1. or d d represents numeric digits before and or after the decimal A decimal may be used in any position in the value after the polarity sign If a decimal is not used it will be assumed to be after the last digit For example 3 29 23 5 25 45 300 If one or more values were specified and a aDO returns no data lt CR gt lt LF gt only it means that the measurement was aborted and a new M command must be sent Example of an aD0 command Previous Command Response aM a0044 lt cr gt lt lf gt Note The service request is normally sent within 530mS of receipt of the break The 4 second value reported allows time for a few retries when communicating with the radar subsystem Subsequent Command Response a AA AAA BB BBB CC C lt cr gt lt lf gt Stage feet inches meters etc Distance feet Measurement Status Power Supply Voltage Volts 27 501 12 COMMAND amp RESPONSE Measurements with CRC To enhance the error detection capability in SDI 12 data collection systems a variation of the Start Measurement Commands M1 M91 Start Concurrent Measurement Commands C1 C91 and Continuous Measurement Commands aRO aR9 request that the data be returned with a 16 bit Cyclic Redundancy Check CRC appended to it These commands use the existing command letters with C appended namely aMC aMC1 aMC aCC aCC1 aCC9 and aRCO aRC9 When these c2. INSTALLATION amp MAIN TENANCE Remember that grounding should be simple If your system grounding is getting complicated something is wrong The purpose of grounding is to remove ground loops Ground loops without getting into a technical physics discussion are the source of most eguipmentfield failures Atthe gauge house use a simple Single Point Ground as shown in the above illustrations Remove any multiple or redundant ground wires Keep your wires neat and clean Things that look good seem to work good Connecting Your Data Logger The Radar is supplied with a 6 foot 4 conductor polyurethane cable for making convenient connections to your data logger The cable is routed thru a liguid tight cord connector on the radar housing and is waterproof and sunlight resistant The Radar is a SDI 12 V1 3 compliant sensor and connects directly to any data recorder with SDI 12 capability 4 Conductor Cable 12V Power SDI 12 Data Gnd Gnd If the 6 foot cable is unsuitable for your application it may be removed and replaced with a longer cable Internal to the radar housing the SDI 12 interface module has a removable 3 position connector for making SDI 12 connections The SDI 12 connections provides both 12V power and SDI 12 serial data communications You will need a 1 8 inch blade screwdriver to connect the wires to the plug in connector The connections inside the radar housing may be accessed with the following procedure 1 Di
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4. command except that the values generated are fixed test data and the results of diagnostic checksum tests The data generated in response to this command is placed in the sensor s buffer for subsequent collection using D commands The data will be retained in the sensor until another M C or V command is executed Command Response Description aV atttn lt cr gt lt lf gt Initiate verify sequence 28 SDI 12 Command 8 Response 2 Command amp Response Where a is the sensor address 0 9 A Z 2 x V is an upper case ASCII character is a three digit integer 000 999 specifying the maximum time in seconds the sensor will take to complete the command and have data available in its buffer n is a single digit integer 0 9 specifying the number of values that will be placed in the data buffer If n is zero 0 no data will be available using subsequent D commands Example of an aV command Command Response Time Values Description aV a0013 lt cr gt lt lt gt 3 Return fixed data and diagnostic data for testing purposes Subseguent Command Response a 123 456 78 9 y lt cr gt lt lf gt Key Description Units 123 456 Fixed test data 78 9 Fixed test data y ROM checksum test 0 Failed 1 Passed Send Identification Command The Send Identification Command responds with sensor vendor model and version data Any measurement data in the sensor s buffer is n
5. n is a single digit integer 0 9 specifying the number of values that will be placed in the data buffer If n is zero 0 no data will be available using subsequent D commands Upon completion of the measurement a service request a lt cr gt lt lf gt is sent to the data recorder indicating the sensor data is ready The data recorder may wake the sensor with a break and collect the data any time after the service reguest is received or the specified processing time has elapsed 23 501 12 COMMAND amp RESPONSE Example of an aM2 command Command Response Time Values Description 2 a0013 lt cr gt lt lf gt 1 sec 3 Make measurement Subseguent Command Response aDO lt gt lt gt Where AA AAA Stage feet inches meters etc BB BBB Standard Deviation feet inches meters etc CCC Power Supply Voltage Volts aM3 15 Second Average Measure Command The Radar only supports the aM3 measurement command when the Power Mode 1 Data values generated in response to this command are stored in the sensor s buffer for subseguent collection using D commands The data will be retained in the sensor until another M or V command is executed When Power Mode 0 the Radar returns 30000 signifying the command is not supported in this mode When Power Mode 1 the Radar averages the data collected from the previous fifteen seconds and return
6. Concurrent aC1 Command This command is similar to the aM1 command however the nn field has an extra digit and the sensor does not issue a service request when it has completed the measurement Data values generated in response to this command are stored in the sensor s buffer for subsequent collection using D commands The data will be retained in the sensor until another M or V command is executed Command Response Description aC 1 atttnn lt cr gt lt lf gt Initiate measurement Where a is the sensor address 0 9 A Z a z x n C is an upper case ASCII character ttt is a three digit integer 000 999 specifying the maximum time in seconds the sensor will take to complete the command and have measurement data available in its buffer nn isatwo digit integer 00 99 specifying the number of values that will be placed in the data buffer If n is zero 0 no data will be available using subsequent D commands The data recorder may wake the sensor with a break and collect the data anytime after the specified processing time has elapsed This command may not work for some applications as the data logger must wait 1 second before collecting data which may not work for applications requiring a faster response Concurrent aC2 Command This command is similar to the aM2 command however the nn field has an extra digit and the sensor does not issue a service reguest when it has c
7. Where a is the current old sensor address 0 9 A Z 2 An ASCII may be used as a wild card address if the current address is unknown and only one sensor is connected to the bus A is an upper case ASCII character n is the new sensor address to be programmed 0 9 A Z NOTE To verify the new address use the Identify Command Example of a Change Sensor Address command Command Response Description 2 2 lt gt lt gt Change sensor address to 2 30 SDI 12 Command amp Response 2 Command amp Response Extended Set_Current_Stage Command The Radar processes Distance data and computes Stage m Distance b During installation it is convenient to quickly set the Radar s Stage reading to match the current stage or elevation of the water as determined by a staff gauge or other datum This command causes the Radar to make a fresh measurement and automatically update the Offset b term as needed to produce the desired Stage Example of an Extended Set Current Stage command Command Response Time Values Description aXSCS2 3 a0041 lt cr gt lt lf gt 4 1 Set the Stage to 2 3 SubseguentCommand _ Response Description aDO 12 80 lt gt lt 1 new Offset Extended Read Write Stage_Offset and Read Write Stage_Slope The Radar processes the Distance data and computes Stage m Distance b The Slope m and Of
8. become brittle or crack when exposed to ultraviolet radiation from the sun If conduit is used to connectto the Radar remove and discard the liguid tight cord retainer If metal conduit is used the conduit must be grounded When using conduit the entry must be sealed with silicone or other sealantto prevent moisture from entering the Radar enclosure via the conduit piping The thermal mass of the casting will cause water vapor to internally condense and accumulate with changes in the weather Caution Remove all power from the unit before making any connections Warning All wiring must be done by qualified individuals in accordance with applicable codes such as the ANSI NFPA 70 specifications or the Canadian Electrical Code Part 1 Grounding Your Radar The following graphic illustrations are the recommended methods for grounding the Radar These grounding methods will work if the guidelines are strictly followed It should be mentioned that not much can protect your site if it suffers a direct lightning strike However these general grounding techniques can certainly help protect the equipment from normal occurrences It is hoped that this information will serve as a reference guide to grounding your Radar Grounding Your Radar Over Cable Grounding the Radar is a simple yet subtle thing to do Figures on page 10 show the preferred methods for grounding a radar gauge over a cable A metal conduit is to be used If jun
9. http www ysi com terms and conditions php This user manual is a guide for the H 3611 12 13 Radar Level Series For more information updated manuals brochures technical notes and supporting software on the H 3611 12 13 Radar please refer to waterlog com radar or contact your sales representative For additional assistance please contact us at 1 435 753 2212 or sales waterlog com gt AUN 1 7 INTRODUCTION Al e AN 4 7 a 2 a n t i Introduction The WaterLOG Radar Series consist of the H 3611 H 3612 and H 3613 products Typical applications include non contact measurement of river lake and reservoir water level The sensor makes multiple distance measurements averages the results and converts the measurement data into Stage in units of Feet Meters or other engineering units The Radar Series is easy to use and works with any data recorder logger with a SDI 12 interface They are powered from the 12V wire of the 3 wire SDI 12 bus The Serial Digital Interface SDI 12 is ideal for data logging applications with the following requirements Battery powered operation with minimal current drain e Measurement data is transmitted digitally over long cable lengths without error Multiple sensors on a simple three wire cable e Up to 250 feet of cable between a sensor and the data recorder Use of an H 423 SDI 12 to RS485 or an H 4500 fiberoptic media convert
10. RESPONSE This is a brief description of the Serial Digital Interface 501 12 Command and Response Protocol used by the WaterLOG Radar Series Included is a description of the commands and data format supported by the Radar Refer to the document A SERIAL DIGITAL INTERFACE STANDARD FOR HYDROLOGIC AND ENVIRONMENTAL SENSORS Version 1 3 January 12 2009 Coordinated by the SDI 12 Support Group 135 East Center Logan Utah During normal communication the data recorder sends an address together with a command to the Radar SDI 12 sensor The Radar then replies with a response In the following descriptions SDI 12 commands and responses are enclosed in guotes The SDI 12 address and the command response terminators are defined as follows HH a Is the sensor address The following ASCII Characters are valid addresses 0 9 A Z a z 2 Sensors will be initially programmed at the factory with the address of 0 for use in single sensor systems Addresses 1 to 9 and Ato Z or ato z can be used for additional sensors connected to the same SDI 12 bus Address and are wild card addresses which select any sensor regardless of its actual address m Is the last character of a command block cr lf Are carriage return OD hex and line feed hex characters They are the last two characters of a response block Notes All commands responses are upper case printable ASCII characters Commands mus
11. of an Extended Read Slope command Command Response lime Values Description aXRS 0011 lt gt lt 1 sec 1 Read Slope Subsequent Command Response Description aDO 1 00 lt gt lt Slope is 1 00 Example of an Extended Write Slope command Command Response Time Values Description aXWS1 234 a0011 lt cr gt lt lf gt 1 sec 1 Write Slope Subsequent Command Response Description at1 234 lt cr gt lt lf gt Slope is 1 234 Extended Read Power Mode and Write Power Mode Normally the Radar transmits the service request within 530mS of receipt of the break As with some data loggers this leaves insufficient time to sustain continuous measurements once per second The Power_Mode is an internal setting which puts the Radar in a fast measure mode In this mode the Radar is always awake and automatically collecting data from the radar unit and storing it at 1 second intervals In this mode the sensor uses additional power Changing this mode will allow and disallow the use of some measurement types This command is used to change the power mode The Radar comes from the factory with the power mode set to the Sleep mode This setting is stored in non volatile FLASH memory within the sensor Once a new value is written a copy is sent to the sensor data buffer for verification This data can be viewed by using a subsequent D command To read or verify the value any o
12. performs the following measurement sequence 1 Makes 181 measurements at a precise1 0 second interval 2 Computes the standard deviation for the data set 3 Multiplies the standard deviation by 3 to obtain a High and Low outlier threshold 4 Sifts through the data set and discards data points above and below the outlier thresholds 5 Computes the mean and standard deviation again for the data set with the outliers removed When Power Mode 1 the Radar internally performs the following measurement sequence 1 Collect a set of 1 Hz samples centered in the previous six minute time block the length of which is selected by the user ranging from 1 360 data points 2 Computes the standard deviation for the data set 3 Multiplies the standard deviation by 3 to obtain a High and Low outlier threshold 4 Sifts through the data set and discards data points above and below the outlier thresholds 5 Computes the mean and standard deviation again for the data set with the outliers removed The standard deviation is computed as follows 1 Compute the mean for the data set 2 Compute the deviation by subtracting the mean from each value 3 Square each individual deviation 4 Divide by one less than the sample size 5 Take the square root Command Response Description aM1 atttn lt cr gt lt lf gt Initiate measurement Where a is the sensor address 0 9 A Z a z rr M is an upper case ASCII character ttt is a three digit int
13. BB CC DD D lt cr gt lt lf gt Where a SDI 12 address 0 9 A Z AA AAA Stage feet inches meters etc BB BBB Distance feet i e raw radar measurement Measurement Status 0 success DD D Power Supply Voltage Volts Programming The SDI 12 Interface The radar unit measures the distance between the mounting flange of the horn to the water surface The SDI 12 interface internal or external processes the raw Distance measurement with a Stage m Distance b equation The Slope m and Offset b terms are programmable allowing the user to scale the reading into other engineering units The Radar comes from the factory with the following settings SDI Address O Slope 1 0 Offset 0 0 With these values the Stage measurement data will be in units of feet The reason for a negative slope is that the radar measures Distance as the water rises Distance decreases These setups are stored in FLASH memory within the Radar and will not be lost if the power is disconnected The extended commands for changing the address slope and offset are described in detail in Chapter 3 If more than one sensor is to be connected to the SDI 12 bus make certain each sensor has a unique address Setup and Test Procedure Step 1 Double check all wiring connections Connect the Radar to your data recorder and apply 12V power Step 2 The Radar comes from the factory with it s SDI 12 address set to 0 Verify the Radar is respondin
14. Horn g 4 in 101 6 mm Extended Horn 10 76 2 mm PTB Horn COMMUNICATIONS SDI 12 V1 2 7 bit even parity 1 stop bit Output Voltage Minimum high level 3 5 volts Levels Maximum low level 0 8 volts ENVIRONMENTAL Operating 40 C to 80 C Temperature Storage 40 C to 80 C Temperature Temperature Sensitivity Average TK 2 mm 10 K max 5 mm over the entire temperature range 40 C to 80 C MISCELLANEOUS The WaterLOG H 3611 H 3612 H 3613 series radars are warranted against defects in materials and workmanship for two years from date of shipment Specifications subject to change without prior notice due to ongoing commitment to product testing and improvement LR June 17 2013 D4 0613 Appendix Appendix B FCC Equipment Authorization Information For User NOTE This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the inte
15. USER MANUAL V2 0 FOR FIRMWARE V2 0 SDI 12 RADAR WATER LEVEL SENSOR YSI D36 0514 a xylem brand CONTENTS amp WARRANTY Marranty 1 Chapter 1 2 Egg PE 3 Built in LCD 4 COMMUNICATIONS 2 ss acess chaise RC CT 4 Fast Mode Data Logging 4 NOAA Mode 4 Fast Measure 5 Approval tinet dotate 5 Chapter 2 Installation amp Maintenance 6 Installation 7 General Installation 8 Mounting the Radar Unit Vertical Alignment 8 Making Connections 9 Grounding Your Radar 9 Over Cables a k remitido M 9 Wireless Radio e tree eret aa 11 Connecting Your Data Logger sess 12 Programming Your SDI 12 Data Recorder 13 Programming the 501 12 13 Setup and Test 13 Programming the Radar 14 Built in EC Sse 15 Chapter 3 SDI 12 Command amp Response Protocol 17 Command Suma noe rege petet en E dd 19 Measure 19 aM 1 NOAA Measure 21 aM2 1 Minute Aver
16. a AA AAA BB BBB CC DD D lt cr gt lt lf gt Stage feet inches meters etc Standard Deviation feet inches meters etc Number of outlier data points discarded Power Supply Voltage Volts 22 5012 Command 8 Response 2 Command amp Response aM2 1 Minute Average Measure Command The Radar only supports the aM2 measurement command when the Power Mode 1 Data values generated in response to this command are stored in the sensor s buffer for subseguent collection using D commands The data will be retained in the sensor until another M C or V command is executed When Power Mode 0 the Radar returns a0000 signifying the command is not supported in this mode When Power Mode 1 the H 3611 averages the data collected from the previous minute and returns the mean and standard deviation The standard deviation is computed as follows 1 Compute the mean for the data set 2 Compute the deviation by subtracting the mean from each value 3 Square each individual deviation 4 Divide by one less than the sample size 5 Take the square root Command Response Description aM1 atttn lt cr gt lt lf gt Initiate measurement Where a is the sensor address 0 9 A Z a z M is an upper case ASCII character ttt is a three digit integer 000 999 specifying the maximum time in seconds the sensor will take to complete the command and have measurement data available in its buffer
17. age Measure Command 23 aM3 15 Second Average Measure Command 24 Concurrent Measurement 25 Concurrent aC1 26 Concurrent aC2 Command sse 26 Send Data oet ess 27 Measurements with 28 Continuous 28 Send Acknowledge 28 Initiate Verify 28 Send Identification Command 29 Change Sensor Address 30 Extended Set Current Stage 31 Extended Read Write Stage Offset and Stage Slope 31 Extended Read Number of Measurements 33 Extended Write Number of Measurements 33 Extended XTEST vccvsssssasseceancsenssssdtascaseteadeneaietsoranvesseteease 34 Chapter 4 35 Appendix A 5 36 Appendix FCC Equipment Authorization 37 Contents amp Warranty 00000 amp Warranty WATERLOG PRODUCTS MANUFACTURED BY YELLOW SPRINGS INSTRUMENTS CO INC are warranted by Yellow Springs Instruments Co Inc YSI to be free from defects in materials and workmanship under normal use and service for twelve 12 months from date of shipment unlessotherwise specif
18. ay not cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired operation 0 2 7 FE ON 8 MAINTENANCE b 1 EN 7 ice Installation amp Maintenance The Radar is a time of flight microwave radar level sensor It excels in applications where ice logs floating debris and boat traffic can damage stilling wells and other infrastructure When installed on a bridge over shallow streams having sandy bottoms the radar can be moved from location to location as the river shifts channel position after storm events Installation Techniques For installations where vandalism is of concern or additional protection is needed many users prefer to install the radar unit in a protective housing The housing provides a convenient location for installing other gauge station equipment such as a battery or data logger Several housings are available from WaterLOG please contact the factory for further information WaterLOG also offers optional installation packages that have a solar panel battery and short range telemetry radio for communicating with a nearby gauge station Several typical installations are shown below INSTALLATION amp MAIN TENANCE General Installation Recommendations Before proceeding with the installation please consider several site preparation and maintenance issues The Radar Series has been designed to operate safely in accordance wit
19. ction boxes or pull boxes are used they are to be metal as well The metal conduit will provide a conducting path to ground for the radar enclosure and also actas a shield that will conduct away electrical noise If a flex conduit is used at the radar enclosure or at the gauge house this conduit must be a conducting type of conduit Note you must also use a conducting connector for conducting flex conduit The electrical cable is to have a shield and at least 3 conductors The wire conductor gauge of 20awg is recommended for most applications but 9 you may certainly use 18 or 16 gauge conductors as well INSTALLATION amp MAIN TENANCE Gauge Station Building Data Logger Earth Ground Point Ground Rod Gauge Station Building Earth Ground Tie Point B 10 Grounding The Radar Unit Radar Enclosure No connection to Cable Shield or Drain Wire Metal Conducting Conduit Cable Shield amp Drain Wire pe Layout of Hard Wire Radar Installation Grounding The Radar Unit Radar Enclosure No connection to Cable Shield or Drain Wire Metal Conducting Conduit 22 Cable Shield amp Drain Wire Insulator 227 7 7 Ground Rod Layout of Hard Wire Radar Installation with Insulator instalation amp Maintenance amp Maintenance The main difference between the figures on page 10 is that the radar enclosure in the second figure is insulated from the bridge structu
20. discards data points above and below the outlier thresholds 5 Computes the standard deviation again for the data set with the outliers removed The standard deviation is computed as follows 1 Compute the mean for the data set 2 Compute the deviation by subtracting the mean from each value 3 Square each individual deviation 4 CC 4 Divide by one less than the sample size 5 Take the square root The aM1 command response is 01844 184 seconds 4 parameters The sensor buffer will contain 4 parameters mean standard deviation number of outliers and battery voltage If the built in NOAA mode is not workable the 3611 supports an alternate fast measure mode Fast Measure Mode Normally the Radar transmits the service request within 530mS of receipt of the command As with many data loggers this leaves insufficient time to sustain continuous measurements once per second The Power Mode is an internal setting which places the H 3611 in a fast measure mode In this mode the Radar is always awake and automatically collecting data from the radar unit at a 1 second interval and stores the previous six minutes of data in the stack In this mode the sensor uses additional power When an aM measurement is received the sensor response is 0014 1 seconds 4 parameters The service request is sent within 55mS of receipt of the command 170mS of receipt of the break This leaves plenty of time for a data logger to coll
21. dit the radar unit configuration The LCD display has a short cord and can be detached from the radar housing for convenience Communications The Radar sensor is a stand alone instrument that provides an SDI 12 output for communications with a datalogger The sensor is supplied with a liquid tight fitting and two 6 foot cables One cable is convenient for making connections to your data logger the second cable used to connect to a laptop computer when using the TofTool configuration and diagnostic program Fast Mode Data Logging The Radar response to an aM command is 0044 4 seconds 4 parameters The actual measurement completes very guickly and the service reguest is sent within 530ms The reported 4 second value allows time for retries when troubleshooting the internal connection between the SDI 12 interface and the radar unit Unfortunately most data loggers cannot sustain a 1 second logging interval even if the sensor responds within 500mS For making measurements at a sustained 1 second measurement interval two options are available as explained below NOAA Mode Measurement The Radar supports the aM1 measurement The H 3611 internally performs the following measurement sequence 1 Makes 181 measurements at a precise 1 second interval 2 Computes the standard deviation for the data set 3 Multiplies the standard deviation by 3 to obtain a High and Low outlier threshold 4 Sifts through the data set and
22. ect the data while sustaining a 1 second logging interval The data placed in the sensor buffer is the results of the previous internal measurement 1 second old The data logger must implement its own internal NOAA or other filtering and averaging computations When in fast measure mode the radar makes continuous measurements which allows a different type of NOAA mode measurement to take place When in fast measure mode the aM 1 command is replaced with a command that takes the data from the previous six minutes and performs the same procedure as the NOAA mode measurements namely 1 Collect a set of 1 Hz samples centered in the previous six minute time block the length of which is selected by the user ranging from 1 360 2 Computes the standard deviation for the data set 3 Multiplies the standard deviation by 3 to obtain a High and Low outlier threshold 4 Sifts through the data set and discards data points above and below the outlier thresholds 5 Computes the mean and standard deviation again for the data set with the outliers removed In addition to the aM1 command the aM2 and aM3 commands have been added which take the simple average and standard deviation of the previous 1 minute and 15 second data sets respectively All of these commands have concurrent counterparts as well FCC Approval This device complies with part 15 of the FCC Rules Operation is subject to the following two conditions 1 This device m
23. eet inches meters etc BB BBB Standard Deviation feet inches meters etc Power Supply Voltage Volts Concurrent Measurement Command A concurrent measurement is one which occurs while other SDI 12 sensors on the bus are also taking measurements This command is similar to the aM command however the nn field has an extra digit and the sensor does not issue a service reguest when it has completed the measurement Communicating with other sensors will NOT abort a concurrent measurement Data values generated in response to this command are stored in the sensor s buffer for subseguent collection using D commands The data will be retained in the sensor until another M C or V command is executed Command Response Description aC atttnn lt cr gt lt lf gt Initiate measurement Where a is the sensor address 0 9 A Z a z is an upper case ASCII character ttt is a three digit integer 000 999 specifying the maximum time in seconds the sensor will take to complete the command and have measurement data available in its buffer nn _ isatwo digit integer 00 99 specifying the number of values that will be placed in the data buffer If n is zero 0 no data will be available using subsequent D commands The data recorder may wake the sensor with a break and collect the data anytime after the specified processing time has elapsed 25 501 12 COMMAND amp RESPONSE
24. eger 000 999 specifying the maximum time in seconds the sensor will take to complete the command and have measurement data available in its buffer n is a single digit integer 0 9 specifying the number of values that will be placed in the data buffer If n is zero 0 no data will be available using subsequent D commands 21 501 12 COMMAND amp RESPONSE Upon completion of the measurement a service request a lt cr gt lt lf gt is sent to the data recorder indicating the sensor data is ready The data recorder may wake the sensor with a break and collect the data any time after the service reguest is received or the specified processing time has elapsed Example of an aM 1 command when Power Mode 0 Command Response Time Values Description aM1 a1844 lt cr gt lt lf gt 184 4 Make measurement Note The service reguest is normally sent within 182 seconds of receipt of the command The 184 second value reported allows time for a few retries when communicating with the radar subsystem Subseguent Command Response a tAA AAA BB BBB CC DD D lt cr gt lt lf gt Stage feet inches meters etc Standard Deviation feet inches meters etc Number of outlier data points discarded Power Supply Voltage Volts Example of an aM1 command when Power Mode 1 Command Response Time Values Description aM 1 a0014 lt cr gt lt lf gt 1 sec 4 Make measurement Subsequent Command Response
25. ements Where a is the sensor address 0 9 A Z a z mr XRNM are upper case characters XWNM are upper case characters nn is the new setting 1 360 This command takes 001 seconds to complete and places 1 value in the data buffer Use the aDO command to collect and view the current value Example of an Extended Read Number of Measurements command Command Response Time Values Description aXRNM a0011 cr lf 1sec 1 Read Number of Measurements Subsequent Command Response Description 360 lt gt lt gt of Measurements 360 Example of an Extended Write Number_of_Measurements command Command Response Time Values Description aXWNM181 0011 lt gt lt gt 1 sec 1 Write Number_of_Measurements SubseguentCommand _ Response Description 0 181 lt gt lt gt Number of Measurements 181 501 12 COMMAND amp RESPONSE Extended XTEST This command is used for installation or production testing and requires the use of a H 4191 Sidekick interface and a PC or an XL Series Data Logger This command causes the Radar to transmit unsolicited real time data for testing purposes The test mode is used to help troubleshoot the installation by providing a continuous readout of measurement data This is not compliant with the SDI 12 specification and cannot used with most data loggers This command returns different data based on t
26. er extends the range to 1000 s of feet Features Below is a quick overview of the common features of all Radar series products e Simple to install use and maintain e Non contact level measurement eliminates the need for stilling wells and other infrastructure e Undamaged by ice logs or debris 3 0mm accuracy with standard model 40 C to 80 C operation e NEMA 4x enclosure is suitable for outdoor installations e Stainless steel horn H 3611 H 3612 Frequency range approx 26 Ghz Built in LCD screen for monitor and setup Low current operation 8 0 mA typical standby Continuous operation no warmup or lock on needed Extended SDI 12 commands for setting the Stage to the current water elevation e Built in 3 or 6 minute NOAA mode measurements Optional fast mode sends the service request within 55mS for sustained 1 second data logging Description The Radar Level gauge consists of an integrated microwave transmitter and sensor together with a horn antenna The horn antenna serves to focus the transmitted signal as well as to receive the reflected echo A built in SDI 12 interface provides low power operation data processing and SDI 12 communications with the data logger INTRODUCTION Built in LCD Display The Radar sensor has a built in LCD display which normally shows Distance distance from the radar unit to the water The display hasthree buttons and can be used to monitor or e
27. figuration To access the display unscrew the housing cover the round casting with the glass window Take precautions to not contaminate or dislodge the o ring seal in the cover The LCD display has a short cord and can be detached from the radar for convenience Each function menu has a Function Group and Function number in the upper right hand corner of the screen Together they provide orientation within the menu map 24 m distance process conn to min level Installation amp Maintenance LIQUID CRYSTAL DISPLAY Function empty calibr Function Group safety settings mounting calibr empty calibr 20 000 distance process conn to min level 2 305m 10 00 INSTALLATION amp MAINTENANCE KA a Micropilot M Brief operating instructions input E input F only tor see sketch see sketch dion 0 4 unlock parameter z 100 unlocked acre 06290 22457 locked The radar unit supports other configurations such as tank volume gauging which are not used for stream gauging applications When using the LCD setup menus be careful to not indiscriminately alter the setup parameters For special applications or problematic installations such as having false echoes from a bridge pier please contact WaterLOG for advice 16 9 3 spi 12 COMMAND amp _RESRONSE PROTOCOL N 7 hs SDI 12 COMMAND amp
28. fset b terms are programmable allowing the user to scale the reading into other engineering units These commands allow the user to read or write change the Slope and Offset terms The Slope is to 1 0 and the Offset to 0 00 at the factory With the factory default 1 0 the Stage will be in units of water depth in feet The reason for a negative slope is thatthe radar measures Distance as the water rises Distance decreases These values are stored in non volatile FLASH memory within the sensor Once the new Slope or Offset value is written to the FLASH memory a copy is sentto the sensor data buffer for verification This data can be viewed by using a subsequent D command To verify these settings any other time use the XRS or commands This command takes 001 seconds to complete and places 1 value in the data buffer Use the command to collect and view the new slope or offset Command Response Description aXRS 0011 lt gt lt gt Read Slope aXRO a0011 lt cr gt lt lf gt Read Offset aXWSddd 0011 lt gt lt gt Write Slope aXWOddd a0011 lt cr gt lt lf gt Write Offset Where a is the sensor address 0 9 A Z a z XRS are upper case characters XRO are upper case characters XWS are upper case characters XWO are upper case characters 31 ddd is the new slope or offset value For example 20 0 195 501 12 COMMAND amp RESPONSE Example
29. g by issuing a Send Identification command If more than one sensor is to be connected to the SDI 12 bus make certain each sensor has a different sensor address If needed the address can be changed with an SDI 12 command see Chapter 3 13 INSTALLATION amp MAIN TENANCE Step 3 Make several measurements aM and aD0 and verify the Distance measurement is correct Do not be concerned if the Distance measurement is several inches in error the radar sensor may have a small distance offset and it s often difficult to directly measure between the mount flange and the water surface The Distance value is continually displayed on the built in LCD display Step 4 With the Slope set to 1 0 the Stage will be in units of feet If other engineering units are wanted change the Slope as described in Chapter 3 Step 5 Setting the Stage When the Radar is first installed you will wantto adjustthe Offset such that the SDI 12 measurement data Stage corresponds to the current water elevation or stage as determined with a staff gauge or other datum An extended SDI 12 command is convenient to quickly set the Radar Stage reading to match the current water level The aXSCSdd d command causes the Radar to make a fresh measurement and automatically update the Offset as needed to produce the desired Stage See Chapter 3 for details Example of a H 3611 Extended Set Current Stage command Command Response Time Values Descrip
30. h current technical safety and EU standards Personnel must be authorised and suitably gualified The manual must have been read and understood and the instructions followed Warning Working over water or on tall structures can be dangerous Use a safety harness fall arrest device life saver and or other safety eguipment when conditions warrant Follow these guidelines when selecting a location for the radar gauge The radar unit is a precision instrument and should not be jarred or dropped The sensor must be mounted rigidly to prevent movement from wind and vibration antenna horn must be aligned within 1 of vertical to prevent trigonometric measurement errors Make certain the sensor is mounted high enough to avoid being submerged during high water or flood conditions The sensor is rated NEMA 4x and can be mounted outdoors in unprotected locations The operating temperature range for the sensor is 40 C to 80 C sensor should be mounted above the smoothest portion of the water surface Generally between piers of a bridge structure However on bridges with long spans between the piers there will be more vibration on the bridge To moderate the vibration in these situations mount the radar 1 4 to 1 3 the span distance from the pier There should be a clear path between the sensor and the water to avoid false reflections Try to locate the sensor to keep the beam path 8 for 4 inch horn 10 f
31. he Power Mode setting To activate the test mode send the command aXTEST In Power Mode 0 The Radar will enter the test mode and make continuous measurements The test mode is exited by sending a break or any new command on the SDI 12 bus It may take a few tries to exit if the command is sent at the same time data is being sent from the Radar Removing power from the Radar also causes it to exit this mode In Power Mode 1 the Radar will enter the test mode and take the raw data that would otherwise be used for an aM1 command and outputs it to the SDI 12 bus one piece at a time in order from newest to oldest After the data is sent it waits for 2 seconds and then starts over as if a new aXTEST Command were sent The test mode is exited by sending a break or any new command on the SDI 12 bus It may take a few tries to exit if the command is sent at the same time data is being sent from the Radar Removing power from the Radar also causes it to exit this mode Format SensorAdr Stage Distance Status XTEST displays the following data 1 202 43 222 0 1 212 3 232 0 1 222 3 342 0 1 232 3 352 0 1 232 3 352 0 etc OO OOG 34 c m m zh up 35 APPENDIX Appendix A Specifications PERFORMANCE 20 01 ft 3 mm H 3611 3613 including linearity repeatability and hysteresis Emission to EN 61326 Electrical Equipment Class B Electromagnetic Compatibil
32. ied in the corresponding YSI pricelist or product manual WaterLOG products not manufactured but that are re sold by YSI are warranted only to the limits extended by the original manufacturer Batteries desiccant and other consumables have no warranty YSI s obligation under this warranty is limited to repairing or replacing YSI s option defective products which shall be the sole and exclusive remedy under this warranty The customer shall assume all costs of removing reinstalling and shipping defective products to YSI YSI will return such products by surface carrier prepaid within the continental United States of America To all other locations YSI will return such products best way Port of Entry INCOTERM 2010 prepaid This warranty shall not apply to any products which have been subjected to modification misuse neglect improper service accidents of nature or shipping damage This warranty is in lieu of all other warranties expressed or implied The warranty for installation services performed by YSI such as programming to customer specifications electrical connections to products manufactured by YSI and product specific training is part of YSI s product warranty YSI EXPRESSLY DISCLAIMS AND EXCLUDES ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE YSI is not liable for any special indirect incidental and or consequential damages A complete TERMS AND CONDITIONS OF SALE can be viewed at
33. ity Pulse Energy 1mW max 1uW average Radar Unit Radar Unit Beam Radius 3 in Horn 76 2 Range mm Radar Unit Beam Radius 4 in Horn 101 6 mm 0 69 ft 0 21 m 1 4 ft 0 427 2 1 ft 0 64 m 2 8 ft 0 85 3 5 ft 1 06 m 5 24 ft 1 6 m 6 99 ft 2 13 m 9 16 ft 2 8 m H 3612 H 3612 H 3612 Measuring Beam Radius 4 in Horn 101 6 mm 10 49 ft 3 2 m 12 34 ft 3 73 m 13 99 ft 4 62 m 16 1 ft 4 89 m Measuring Distance Beam Radius 3 in Distance Horn 76 2 mm NEMA 4x LCD with back light MECHANICAL POWER ousing 17 Lx 6 in W x 6 in 3611 3612 431 8 mm Lx 152 4 mm W x 152 4 mm H Housing 13 in Lx 6 in Wx 6 in H 3613 330 mm Lx 150 mm W x 150 mm H 211mm Lx 75 mm standard 11 in 4 in W Horn H 3613 5 5 in Lx 4 5 in W 140mmLx 114 mm W H 3611 3612 8 Ibs 3 6 kg Horn 8 3 in Lx 3 in W H 3611 3612 282 mm L x95 mm W optional H 3613 7 lbs 3 18 kg Aluminum coated 65 Horn Stainless steel H 3611 3612 Horn PTB H 3613 Voltage Input 10 to 16 volts DC Built in 1 5 KVA Power Requirements Surge Protection Supply Current Standby 8 mA Active 15 mA Startup 20 mA Connection 12V amp SDI 12 Internal 3 position connector ft 1 8 m polyurethane pigtail is provided Cables 6 ft 1 8 m cable with RS 232 connector for TofTool connection Beam Angle 10 76 2 mm Standard
34. ments used in the fast mode aM1 command aXRNM Read the number of measurements used in the fast mode 1 command aXTEST Displays the current settings then displays data at a fast rate aXHELP Displays the supported commands Measure Command The Measure Command causes a measurement seguence to be performed Data values generated in response to this command are stored in the sensor s buffer for subseguent collection using D commands The data will be retained in the sensor until another M C or V command is executed Command Response Description aM atttn lt cr gt lt lf gt Initiate measurement Where a is the sensor address 0 9 7 a z x nr M is an upper case ASCII character ttt is a three digit integer 000 999 specifying the maximum time in seconds the sensor will take to complete the command and have measurement data available in its buffer n is a single digit integer 0 9 specifying the number of values that will be placed 19 in the data buffer If n is zero 0 no data will be available using subsequent D commands 501 12 COMMAND amp RESPONSE Upon completion of the measurement a service request a lt cr gt lt lf gt is sent to the data recorder indicating the sensor data is ready The data recorder may wake the sensor with a break and collect the data any time after the service reguest is received or the specified processing time has elapsed Example of an aM co
35. mmand Command Response Time Values Description aM 0044 lt gt lt 4sec 4 Make measurement Note The service request is normally sent within 530mS of receipt of the break Subsequent Command Response aDO a tAA AAA BB BBB CC DD D lt cr gt lt lf gt Where AA AAA Stage feet inches meters etc BB BBB Distance feet Measurement Status 0 No errors 1 z 500ms response timeout 2 Response overflowed the buffer 3 No preamble FF s 4 Missing start byte delimiter 5 Wrong delimiter 6 lt Wrong command byte 7 Response code not zero 8 Field Device Malfunction Device Status 80 9 Wrong byte count byte 10 Not enough bytes received 11 Frame parity error Power Supply Voltage Volts Each SDI 12 data point or measurement is input from the radar subsystem The aM command does not filter or average the measurement data The radar unit internally processes raw distance measurements with a damping factor and other filtering algorithms 20 SDI 12 Command amp Response 2 Command amp Response aM1 NOAA Measure Command The Radar supports two different aM1 measurement commands based on the Power Mode Data values generated in response to this command are stored in the sensor s buffer for subsequent collection using D commands The data will be retained in the sensor until another M C or V command is executed When Power Mode 0 the Radar internally
36. ommands are used the data returned in response to the D commands or R commands have a CRC code appended to it All Measure and Concurrent Measure Commands support the CRC functionality In order to have the CRC appended to the data of for example the aM command the command would change to aMC The Concurrent Measurements also support the CRC so for a CRC to be appended onto the aC1 command the variant would be aCC1 Continuous Measurements This is a command for the Version 1 2 SDI 12 Specification Sensors that are able to continuously monitorthe phenomena to be measured such asa cable position do not require a start measurement command They can be read directly with the R commands RO R9 The R commands work exactly like the D DO D9 commands The only difference is that the R commands do not need to be preceded with an M command The Radar does notsupportthe aRO continuous measurement commands because the measurement and math operations require more than 10mS to complete Send Acknowledge Command The Send Acknowledge Command returns a simple status response which includes the address of the sensor Any measurement data in the sensor s buffer is not disturbed Command Response a lt cr gt lt lf gt Where a Is the sensor address 0 9 A Z a z x 2 Initiate Verify Command The Verify Command causes a verify seguence to be performed The result of this command is similar to the aM
37. ompleted the measurement Data values generated in response to this command are stored in the sensor s buffer for subseguent collection using D commands The data will be retained in the sensor until another M C or V command is executed Command Response Description 2 atttnn lt cr gt lt lf gt Initiate measurement Where a is the sensor address 0 9 A Z a z x is an upper case ASCII character is a three digit integer 000 999 specifying the maximum time in seconds the sensor will take to complete the command and have measurement data available in its buffer 26 nn is atwo digit integer 00 99 specifying the number of values that will be placed in the data buffer If n is zero 0 no data will be available using subsequent D commands 5012 Command 8 Response 2 Command amp Response The data recorder may wake the sensor with a break and collect the data anytime after the specified processing time has elapsed Send Data Command The Send Data command returns sensor data generated as the result of previous aM 1 aC or aV commands Values returned will be sent in 33 characters or less The sensor s data buffer will not be altered by this command Command Response aDO through aD9 pd d lt cr gt lt lf gt Where a is the sensor address 0 9 7 a z rr DO D9 areupper case ASCII character Is polarity sign
38. or 3 inch horn clear of excessive turbulence splashing waves pipes wires and other obstructions Avoid submerged obstructions such as rocks or bridge piers that disturb or distort the water level The mounting location should also avoid horizontal structural surfaces such as beams brackets and side wall joints because these surfaces tend to reflect a strong false signal If these cannot be avoided the display can be used to map the radar beam profile and optimize the profile by means of electronic suppression of interference echoes Be aware that bridges and other large structures expand and contract with temperature The bridge height can change a few inches with diurnal temperature changes Trucks and other traffic loads can cause transient changes to the bridge height Mounting the Radar Unit Vertical Alignment Make certain the horn antenna is aligned within 1 of vertical If the antenna is not vertical a trigonometric measurement error with respect to the water will occur and the maximum range will be reduced due to the off axis return signal instalation amp Maintenance amp Maintenance Making Connections SDI 12 Connections Liguid Tight Fitting Since the Radar can be exposed to the sun and weather a cable rated for water immersion rain and sunlight resistance is reguired A polyurethane or similar sunlight and waterproof rated cable is recommended Do not use utility PVC or other wiring materials which can
39. ot disturbed Command Response all allccccccccmnmmmmnmywyvvxx xx lt cr gt lt lf gt Where a is the sensor address 0 9 2 a z nr is an upper case ASCII character ll is the SDI 12 version compatibility level e g version 1 2 is represented as 12 is an 8 character vendor identification to be specified by the vendor and usually in the form of a company name or its abbreviation mmmmmm isa 6 character field specifying the sensor model number is a 3 character field specifying the sensor version number 29 501 12 COMMAND amp RESPONSE XX XX is an optional field of up to a maximum of 13 characters to be used for serial number or other specific sensor information not relevant to operation of the data recorder Example of a al command 12 H 361 1wvS nnnnnnVkkk lt cr gt lt lf gt Radar implementation of the optional 13 character field StnnnnnnVkkk 12 bytes total Where nnnnnn is a six character sensor serial number kkk is a three digit sensor firmware revision level Change Sensor Address Command The Change Sensor Address Command allows the sensor address to be changed The address is stored in non volatile EEPROM within the sensor The Radar will not respond if the command was invalid the address was out of range or the EEPROM programming operation failed Command Response Description aAn n lt ecr gt lt lf gt Change sensor address
40. re Typically bridges are constructed of steel and other conducting materials which act as very good earth grounds The insulator in this picture could be the concrete you are mounting the radar to or some other nonconducting surface You can also choose to use a piece of nonconducting material to mount the radar to Using this type of installation the same rules are followed for both You must provide a metal conducting conduit from the enclosure all the way back to the gauge house No earth grounding is done atthe radar All earth ground connections are made at the gauge house Using these technigues will help solve many of your grounding related issues Grounding Your Radar Using a Wireless Radio This type of eguipment installation by its nature is ideal because the cabling that causes many of the grounding problems has been removed The cable has been replaced by a radio transmitter receiver pair Thus there is no common powering or grounding reguired between these two systems All the eguipment at the remote end or radar installation is connected to a local battery and there are no long cables and conduit to deal with or grounding issues that need to be worked out This type of installation electrically isolates the remote radar eguipment from the datalogger eguipment Thus lightning and other electrical events will have little effect on this type of installation SDI 12 Radio Bridge Remote Radar Sensor Radio Bridge 11
41. rference at his own expense Declaration of Conformity to Part 15 subpart B This device complies with part 15 of the FCC rules Operation is subject to the following conditions 1 This equipment complies with Part 15 of the FCC rules Any changes or modifications not expressly approved by the manufacturer could void the user s authority to operate the equipment 2 This device complies with Part 15 of the FCC rules subject to the following two conditions 1 This device may not cause harmful interference 2 This device must accept all interference received including interference that may cause undesired operation Xylem 1 The tissue in plants that brings water upward from the roots 2 a leading global water technology company We re 12 000 people unified in a common purpose creating innovative solutions to meet our world s water needs Developing new technologies that will improve the way water is used conserved and re used in the future is central to our work We move treat analyze and return water to the environment and we help people use water efficiently in their homes buildings factories and farms In more than 150 countries we have strong long standing relationships with customers who know us for our powerful combination of leading product brands and applications expertise backed by a legacy of innovation For more information on how Xylem can help you go to www xyleminc com xylem Let s Solve Water
42. s the mean and standard deviation The standard deviation is computed as follows 1 Compute the mean for the data set 2 Compute the deviation by subtracting the mean from each value 3 Square each individual deviation 4 Divide by one less than the sample size 5 Take the square root Command Response Description aM3 atttn lt cr gt lt lf gt Initiate measurement Where a is the sensor address 0 9 A Z a z M is an upper case ASCII character ttt is a three digit integer 000 999 specifying the maximum time in seconds the sensor will take to complete the command and have measurement data available in its buffer n is a single digit integer 0 9 specifying the number of values that will be placed in the Zt data buffer If n is zero 0 no data will be available using subsequent D commands SDI 12 Command 8 Response 2 Command amp Response Upon completion of the measurement a service request a lt cr gt lt lf gt is sent to the data recorder indicating the sensor data is ready The data recorder may wake the sensor with a break and collect the data any time after the service reguest is received or the specified processing time has elapsed Example of an aM3 command Command Response Time Values Description a0013 cr Ilf 1 sec 3 Make measurement Subsequent Command Response lt gt If Where AA AAA Stage f
43. sconnect the power supply 2 Unscrew the housing cover the round casting with the glass window Do not contaminate or dislodge the o ring seal in the cover 3 Remove and unplug the LCD display module 4 Remove the cover plate from the terminal compartment 5 Disconnect the 3 position green connector 6 Loosen the nut on the liquid tight connector 7 Unseat loosen the rubber grommet in the liquid tight connector 8 Remove the existing 4 conductor cable If your cable has a dedicated ground wire connect it to the internal ground screw on the bracket the bracket is grounded to the enclosure NOTE This device must not include or make provisions for the use of battery chargers which permit operating while charging AC adapters or battery eliminators and must not connect to the AC power lines 12 indirectly obtaining power through another device instalation amp Maintenance amp Maintenance Programming Your SDI 12 Data Recorder You must prepare your data recorder to receive and record the Radar data Since data recorders differ widely refer to your data recorder manufacturer s directions In general program the data recorder to input four values via the SDI 12 port Usually only one or two of the parameters are actually recorded Your data recorder must issue an aM command then collect the data with a 0 command as explained in Chapter 3 The Radar places four parameters in its data buffer at tAA AAA BB B
44. t be terminated with a character Responses are terminated with lt cr gt lt lf gt characters The command string must be transmitted in a contiguous block with no gaps of more than 1 66 milliseconds between characters To enhance the error detection capability in SDI 12 data collection systems a variation of the Start Measurement Commands M1 M91 Start Concurrent Measurement Commands C1 C91 and Continuous Measurement Commands 0 aR9 request that the data be returned with a 16 bit Cyclic Redundancy Check CRC appended to it These commands use the existing command letters with a C appended namely aMC aMC1 aMC9 aCC aCC1 aCC9 and aRCO aRC9 When these commands are used the data returned in response to the D commands or R commands have a CRC code appended to it 18 SDI 12 Command 8 Response 2 Command amp Response Command Summary The Radar supports the following SDI 12 commands Standard Commands aM Make measurement aM1 Make NOAA measurement aM2 Make 1 minute average measurement aM3 Make 15 second average measurement aDO Send Data aV Verify al Send Identification a Send Acknowledge aAn Change Address Extended Commands aXRS Read Slope aXWSnn Write Slope aXRO Read Offset aXWOnn Write Offset aXRPM Read Power Mode 0 Sleep 1 Fast Measure aXWPMn Write Power Mode 0 Sleep 1 Fast Measure aXWNM Write the number of measure
45. ther time use the XRPM command Command Response Description aXRPMI a0011 lt cr gt lt lf gt Read Power Mode aXWPMn a0011 cr lf2 Write Power Mode Where a is the sensor address 0 9 A Z a z XRPM are upper case characters XWPM are upper case characters n is the new setting 0 or 1 32 0 Sleep between measurements 1 Make continuous measurements SDI 12 Command amp Response 2 Command amp Response This command takes 001 seconds to complete and places 1 value in the data buffer Use the command to collect and view the current value Extended Read Number_of_Measurements and Write Number_of_Measurements This command is used to change the number of measurements used in the aM 1 command when the Power Mode is setto 1 The Radar comes from the factory with the number of measurments set to 360 This setting is stored in non volatile FLASH memory within the sensor The minimum and maximum values that can be written are 1 and 360 respectively anything beyond these values will be setto one of the endpoints Once a new value is written a copy is sent to the sensor data buffer for verification This data can be viewed by using a subsequent D command To read or verify the value any other time use the XRPM command Command Response Description aXRNMI a0011 lt cr gt lt lf gt Read Number of Measurements aXWNMnn a0011 cr lf2 Write Number of Measur
46. tion aXSCS2 3 a0041 cr lf 4 1 Set the Stage to 2 3 Subsequent Command Response Description aDO ar12 80 lt cr gt lt lf gt new Offset Step 6 Make several measurements and make certain the Stage reading is correct and the measurements are stable for the current water level and conditions If available a 4191 SDI 12 to RS 232 interface can be used to observe the 5 mode The XTEST mode causes the Radar to transmit unsolicited real time data for testing purposes The test mode is used to help troubleshoot the installation by providing a continuous readout of sensor data This is not compliant with the SDI 12 specification and is not used with data loggers Programming the Radar Sensor The radar unit has many setups and configurations including measurement units max min distance averaging and media conditions For most users the Radar comes from the factory pre configured for most hydrological applications and can be used out of the box For special applications and when performing maintenance and diagnostics the radar unit configuration can be monitored and changed by either the built in LCD display or a Windows based PC program called TofTool Time Of Flight Tool 14 Built in LCD Display The built in LCD display normally displays Distance distance from the radar unit to the water The display has three buttons and can be used to monitor and edit the radar unit con
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