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Aquaread LeveLine, Instruction Manual

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LeveLine

®

  Instruction Manual

10401-01026  Rev D

6.12. MODBUS Data Frame Format

Each data frame transferred via the RS-485 interface represents one byte of data. A data
frame has the following format:

1. 1 start bit (space/0)
2. 8 (RTU mode) or 7 (ASCII mode) data bits (least significant bit first)
3. 1 parity bit (default: even)
4. 1 stop bit (mark/1)

6.13. MODBUS Communication Sequence

All Modbus communication transactions are initiated by the master. The master initiates a
transaction   by   transmitting   a   command   packet.   Commands   fall   into   two   categories:
broadcast and unicast.

Unicast commands are used for addressing slave devices individually. An addressed slave
device processes the command and sends an appropriate response packet back to the
master.

Broadcast commands are used for addressing all slave devices at once. All slaves devices
process broadcast commands, but do not send anything back to the master in response
(because this would cause bus contention).

6.14. MODBUS Data Packet Format

All Modbus data packets have the format:

Field

Size

Content

<a>

1 byte

Slave address (valid values 0x01-0xF7 when a single 
slave is addressed, 0x00 for commands broadcast to 
all slaves)

<function-
code>

1 byte

Function code that identifies the function of the data 
packet (valid values 0x01-0x7F for commands & 
successful responses, 0x81-0xFF for exception 
responses)

<data>

0-252
bytes

Function dependent data

<crc>

2 bytes

16-bit cyclic redundancy check 

In broadcast commands sent by the master, the address byte will contain 0. In unicast
commands, the address byte  will contain the address of the slave device to which the
command is being sent.

In responses from slaves, the address byte will contain the address of the slave which
generated the response.

If   the   LeveLine

®

  successfully   handles   a   command,   its   response   will   contain   the   same

function code as the command. If it cannot successfully handle a command, the LeveLine

®

will generate an exception response with the function code set to 0x80 + the command's
function code.

In   the   <data>   field,   numerical   values   of   size   greater   than   8   bits   are   transmitted   most
significant byte first. In the <crc> field, the CRC is transmitted least significant byte first.
The maximum packet size is 256 bytes.

© 2019 Aquaread

®

 Ltd.

www.aquaread.com

Page 77 of 90

Summary of Contents for LeveLine

Page 1: ...l and Baro Probes and associated LeveLine Meter Utilities Accessories Document No 10401 01026 Revision D Date December 10 2019 Aquaread Ltd Bridge House Northdown Industrial Park Broadstairs Kent CT10 3JP ENGLAND Phone 44 1843 600 030 www aquaread com ...

Page 2: ...t By ensuring this product is disposed of properly you will prevent possible adverse consequences for the environment which could be caused by inappropriate waste handling Note For return for recycling please contact Aquaread Ltd for instructions on how to return end of life equipment accessories and all auxiliary items for proper disposal WARNING Favourable indications made by this equipment do n...

Page 3: ...ation Setup 16 2 7 CALIBRATING THE ELECTRICAL CONDUCTIVITY CELL ON CTD PROBE MODELS 17 2 7 1 EC Calibration Standards 18 2 7 2 Recognising the EC Cell 18 2 7 3 EC Calibration Technique 18 2 7 4 EC Cell Constant 19 2 7 5 Frequency of EC Calibration 19 2 8 LEVELINE SETUP IN DETAIL 19 2 8 1 Checking Memory and Battery Status logging versions only 20 2 8 2 Clearing the LeveLine s Memory logging versio...

Page 4: ...ment 45 3 5 DEPLOYING THE LEVELINE MINI AND MINI CTD 45 4 LEVELINE METER 46 4 1 THE LEVELINE METER AND THE ENVIRONMENT 46 4 2 METER BATTERY INSTALLATION AND CARE 46 4 2 1 Choice of Battery Type 46 4 2 2 Battery Life 46 4 2 3 Battery Charging 46 4 2 4 Battery Condition Icon 47 4 2 5 Battery Saver Functions 47 4 3 OVERVIEW OF THE OPERATING SYSTEM 47 4 4 INITIAL SWITCH ON AND CLOCK SETUP 47 4 5 CONNE...

Page 5: ...rt Concurrent Measurement and Request CRC 70 6 5 12 Additional Concurrent Measurements and Request CRC 71 6 5 13 Start Verification 71 6 5 14 Service Request 71 6 5 15 Send Data 71 6 5 16 Continuous Measurements 72 6 5 17 Continuous Measurements and Request CRC 72 6 6 SDI 12 DEVICE ADDRESS 72 6 7 SDI 12 UNIT IDENTIFICATION 72 6 8 SDI 12 MEASUREMENT COMMANDS 73 6 9 SDI 12 CYCLIC REDUNDANCY CHECK 75...

Page 6: ... LIMITED WARRANTY 85 7 1 CLEANING PRIOR TO RETURN 85 7 2 DECONTAMINATION CERTIFICATE 86 8 TROUBLESHOOTING 87 8 1 TROUBLESHOOTING LEVELINK 88 9 DECLARATION OF CONFORMITY 88 10 TECHNICAL SPECIFICATION 89 2019 Aquaread Ltd www aquaread com Page 6 of 90 ...

Page 7: ...ic pressure data This version offers a maximum logging rate of once per minute with a storage capacity of 150 000 records The LeveLine Mini Probes do not have any logging ability These are designed to output live pressure and temperature data to a third party logging device using industry standard interfaces The CTD version also outputs live electrical conductivity and salinity data The entire Lev...

Page 8: ... there is no memory and battery wasted if the loggers are deployed late 1 2 LeveLine Cabling A number of cables and adaptors are available to allow for various connection permutations The following are some of the most popular and useful combinations 1 2 1 Direct Connection of a LeveLine Logger to a PC The LeveLine PC Kit Part No LL PC KIT shown above allows direct connection of a LeveLine Logger ...

Page 9: ...nection of a LeveLine Logger to a LeveLine Meter This option can be used to setup the Logger read live data or upload logged data whilst the LeveLine Logger is installed For this a LeveLine extension cable Part No EXT LL XM is required 1 2 4 Direct Connection of a LeveLine Meter to a PC This option can be used to retrieve data from a LeveLine Meter that has been previously uploaded to that Meter f...

Page 10: ...reduce the figures shown Logging Event Checking Interval Expected Battery Life 0 1 Sec 18 Days 0 5 Sec 23 Days 1 0 Sec 60 Days 15 0 Sec 2 25 Years 1 Min 7 5 Years 2 Min 10 Years The table above naturally assumes that the Logger s memory would be cleared down each time it becomes full otherwise the Logger would simply stop logging when the memory was full and the battery would then be subject to a ...

Page 11: ...eveLine water level Loggers are factory calibrated at five separate pressure points across their pressure range at two temperatures 5 C and 25 C In addition the CTD versions are also calibrated at a single electrical conductivity point All LeveLine Baro Loggers are factory calibrated at three separate pressure points across their pressure range at two temperatures 5 C and 25 C The data produced by...

Page 12: ... EC cell on the CTD versions can be user calibrated at any time and at any value between 100µS cm and 99 999µS cm Re calibration of the EC Cell can be carried out by using either the LeveLink PC software see Calibrating the Electrical Conductivity Cell on CTD Probe Models or the LeveLine Meter see Calibrating the Electrical Conductivity Cell on CTD Probe Models 2019 Aquaread Ltd www aquaread com P...

Page 13: ...details of LeveLine cabling options 2 2 Downloading LeveLink PC Software from the Aquaread website The LeveLink PC Software is available for download using the following link http www aquaread com software downloads From the Aquaread Downloads page select LeveLink LeveLine Utility The software will be downloaded as a ZIP file 2 3 Software Installation Unzip the downloaded ZIP file into a temporary...

Page 14: ...2 5 Starting LeveLink Select Aquaread then LeveLink from your Programs menu After an introductory splash screen has been displayed the LeveLine Setup screen will appear If you are using a laptop or notebook with a small screen the window can be resized by dragging the bottom right hand corner 2 6 LeveLine Setup Screen Overview The LeveLine Setup screen allows you to setup the following parameters ...

Page 15: ...our PC To connect a LeveLine Probe directly to your PC the LeveLine PC Kit Part No LL PC KIT described in section 1 2 should be used Connect one end of the cable to the LeveLine Probe aligning it as shown below and the other end to a spare USB port on your PC If you wish to setup or retrieve data from a LeveLine Logger whilst it is in service in a bore hole for instance an extension lead and USB a...

Page 16: ...sfer the revised ident to the Logger and the Site Ident box in the LeveLine Settings window will be updated 2 6 4 Update Buttons You will notice that adjacent to each block of settings there is a corresponding Update button If the data stored in the Logger is the same as the data displayed within the User Settings Input boxes the associated update button will be grey If the data stored in the Logg...

Page 17: ...etres feet inches You may choose to display Temperature in either centigrade or Fahrenheit When using a CTD version you may choose to display electrical conductivity EC referenced corrected to 25 C 20 C or absolute ABS Absolute EC does not have any temperature correction applied 2 7 Calibrating the Electrical Conductivity Cell on CTD Probe Models When connected to a CTD Probe the dedicated EC cali...

Page 18: ...or temperature variation in the Calibration Standard during calibration 2 7 2 Recognising the EC Cell The CTD Probes all have an elongated nose sleeve covering the EC cell contacts The black plastic nose sleeve shown removed on the right of the photo forms an integral working part of the Probe s EC measurement system and MUST be fitted during calibration and measurement for correct operation 2 7 3...

Page 19: ...is can vary with different calibration standard values and calibration temperatures If the EC cell constant is reported above 2 00 or below 0 5 carefully clean the EC cell contacts and the inside of the nose sleeve Also check your calibration solution is fresh and that you have input the quoted value at 25ºC during calibration 2 7 5 Frequency of EC Calibration Ideally EC calibration should be carr...

Page 20: ... want to clear the Logger s memory click this button Please use this feature with care Once the Logger s memory has been cleared all level data stored in the Logger will be permanently lost The Clear Memory button does not clear any of the user settings 2 8 3 LeveLine Clock Setup logging versions only The clock setup windows are shown below The boxes within the window to the left labelled Setup Cl...

Page 21: ... 8 5 LeveLine Deployment Position Setup logging versions only The Deployment Position windows are shown below bordered in red The boxes within the LeveLine Ident and Deployment Position window to the right show the current data programmed into the connected LeveLine Logger From new the LeveLine Logger will not have a deployment position programmed and the position boxes will be filled with dashes ...

Page 22: ...ch are for information only The first additional position format is Ordnance Survey OS Grid Reference This grid reference system is only valid within the United Kingdom The second additional position format is Universal Transverse Mercator UTM Grid Reference This grid reference system is valid worldwide If the deployment position stored in the Logger differs from the position displayed within the ...

Page 23: ...w as once every five days 120 hours It is advisable to choose the slowest logging rate that your application can comfortably support This is for two reasons battery life and memory capacity If you choose an extremely fast logging rate the Logger s memory will fill up very quickly and you will have massive files to handle when you come to download and analyse your data Also your battery will be dep...

Page 24: ...Log data for values the End Time and End Date boxes will automatically update See below bordered in red If you want to log data indefinitely set the value in the Log data for to zero If you do this the End Time and End Date boxes will show Not set as shown above and the Logger will continue to log data until you choose to stop logging manually or the Logger runs out of memory or battery capacity F...

Page 25: ...revious section Next select Manual Deployment as shown above Finally select the number of hours you want to log data for Since in this case you are not specifying a time and date for logging to start the End Time and End Date boxes will remain at Not Set The actual time and date the logged data will end will be the chosen number of hours after you manually deploy the Logger If you want to log data...

Page 26: ...this button 2 8 9 Overriding a Scheduled Logging Start If you have set up a scheduled logging start time and date but subsequently want to start logging earlier the scheduled start can be overridden at any time by performing a manual start using a PC running LeveLink a LeveLine Meter or a QuickDeploy Key 2 8 10 LeveLine Event Logging Setup A useful feature of the LeveLine Loggers is the ability to...

Page 27: ...ent logging criteria have been set up transfer the settings to the Logger by clicking the Update Events button 2 9 Preparing to Upload Logged Data From a LeveLine Logger or LeveLine Meter This section deals with retrieving logged data either directly from a LeveLine Logger or from a LeveLine Meter that has previously been used to retrieve data from a Logger in the field As far as the LeveLink soft...

Page 28: ...Kit Switch the Meter on Get the Meter ready for data transfer by pressing the MR Memory Recall key then selecting the desired data set using the up down arrow keys Once the title of the desired data set is displayed on the Meter s screen you are ready to proceed 2 10 Uploading Logged Data from a LeveLine Logger or LeveLine Meter From here on whether connected to a Logger or Meter the technique for...

Page 29: ...creen will be displayed This data upload screen has seven control buttons on the right hand side Initially just three of the buttons will be active These are Upload Data from Probe Meter Upload Status and ID from Probe Meter Open Baro Level Data File 2019 Aquaread Ltd www aquaread com Page 29 of 90 ...

Page 30: ...displayed but the transfer will halt The Upload Status and ID from Probe Meter button will initiate communications with the connected Probe or Meter then upload the probe s Status and ID only The Open Baro Data File button will allow you to open a previously saved logged data file If when you click on one of the Upload buttons you have chosen the wrong upload tab e g you are attempting to upload L...

Page 31: ...ou are using a CTD Probe a third chart will appear below the temperature chart displaying the EC data Use the scroll bar to view this chart 2 10 2 Zooming In and Out In order to examine a section of the graphical data in closer detail it is possible to zoom in on any section of the chart To zoom in simply use your mouse pointer and mouse left button to draw a grey box around the section of data yo...

Page 32: ...an select sections from the tabulated data to save To save the entire data set click on the Save Baro Level Data to File button You will be asked for a file name which will default to the site ident or probe s serial number then the file will be saved with either a llb LeveLine Baro extension or a llw LeveLine Water extension depending upon which tab you are saving data from To save just a portion...

Page 33: ...xporting Logged Data to Google Earth Files Google Earth files are exported in Google s proprietary Keyhole Markup Language with a kml extension and can be directly imported into either Google Maps or Google Earth where a data summary is overlaid on maps or satellite images respectively Please note only data associated with a valid GPS position can be exported as Google Earth files To export a Goog...

Page 34: ...nnected to the Internet in order for the application to access satellite images A typical Google Earth image follows 2 10 7 1 Typical Google Earth Image The summary associated with your data point includes the following Logging start and stop times Minimum and maximum pressure level recorded Change in pressure level range Average pressure level Minimum and maximum temperature recorded Change in te...

Page 35: ...as previously been used to retrieve data from a Logger in the field Alternatively data that has been previously retrieved and saved to your PC can be re opened as described in section 2 10 4 If you plan to correct water pressure data logged using an ABS absolute type Level Logger you should load your water pressure data into LeveLink under the Level Logger Data tab You should then load your associ...

Page 36: ...pe Level Logger this is the only relevant Baro Correction option other then None and serves to zero any slight offset or zero drift in the Gauge type sensor 2 11 3 2 Baro File Baro Correction If your data was logged using an ABS absolute type Level Logger and you have an associated Baro Logger file loaded the Baro File option should be used This will automatically associate the Water Level data an...

Page 37: ...Correction An installation offset is often required to be added to or subtracted from the logged level data This offset should have been measured during installation and could for instance be the distance between the LeveLine Logger and the surrounding ground level the local sea level or the bottom of a river bed See section 3 2 9 for further details To apply an offset to your data tick the Apply ...

Page 38: ...not match the two files up an error message will be displayed If this occurs you must either use an appropriate Baro Log file or choose an alternative method of Baro correction 2 11 8 Applying Multiple Corrections Each time you click the Apply Correction button the corrections you have selected are applied to the raw data from scratch If you have already applied corrections and subsequently change...

Page 39: ...ger deeper than its maximum rating Never deploy a water level Logger where the water is liable to freeze If deploying a Gauge type Logger always use a vented cable 3 2 Deploying the ABS and Baro Versions The absolute ABS and Baro versions of the LeveLine Probes are extremely easy to deploy as they do not require a vented cable ABS and Baro loggers are usually used in conjunction with one another L...

Page 40: ...placing Damage of this kind is not covered by your warranty Ideally the water level Probe should be positioned where it will remain submerged at all times but never to a greater depth than twice its depth rating 3 2 4 Deploying the ABS Logger Measure the distance from the proposed suspension point to the estimated lowest surface level of the water Cut a length of cable approximately one meter long...

Page 41: ...g collar fully DO NOT TWIST THE CONNECTOR BODY WITH RESPECT TO THE LOGGER Once the LeveLine has been connected to the Extension Cable the LeveLine Meter or telemetry device can be connected along with a desiccant housing and desiccant cartridge 3 2 6 Fitting a Desiccant Housing and Cartridge When installing a gauge vented type LeveLine logger with a vented cable the free end of the cable must be p...

Page 42: ...ditions Regular maintenance checks should be made on the installation and the Desiccant Cartridge should be replaced or regenerated before it is completely saturated clear To fit an Extension Cable Desiccant Housing Part No EX DH simply screw the free end of the Extension Cable onto the Housing as shown in the photograph below Once fitted remove the cap from your chosen Desiccant Cartridge and scr...

Page 43: ...ical stresses With the LeveLine Gauge type loggers any zero offset can be easily removed in LeveLink using the Baro Correction feature detailed in section 2 11 3 Deploying the logger with a QuickDeploy Key will make this process fully automatic 3 2 9 Recording the Deployment Offset If an offset is required for post correction measure the distance between the bottom of the Logger and the desired re...

Page 44: ...pth reference marker in the logged data in order to allow absolute depth measurement from the start and carries out an instant check on the battery and memory levels 3 4 1 Setup Prior To Deployment with a QuickDeploy Key If you intend to make use of a QuickDeploy Key it is essential to set the LeveLine Logger up first by connecting it to a PC running LeveLink software Using the LeveLink software s...

Page 45: ...d with this zero marker can be used in the LeveLink software as a barometric pressure reference during data correction for atmospheric pressure See section 2 11 3 1 for further details At any time during the Logger s deployment a QuickDeploy Key can be re connected to the Logger to check battery and memory status and to embed further zero markers This is particularly useful if you are not simultan...

Page 46: ... in this hole Doing so will cause major damage to the vent s waterproof membrane and invalidate your warranty 4 2 Meter Battery Installation and Care The LeveLine Meter requires five AA size batteries To install the batteries loosen the two screws on the centreline of the rear of the meter and remove the battery compartment lid Following the battery polarity markings inside the battery compartment...

Page 47: ...mal operation if you want to activate the backlight without changing the Meter function simply press the ESC key 4 3 Overview of the Operating System The operating software in the LeveLine Meter has been designed for simple intuitive use If you are used to operating a mobile phone or programming audio visual equipment using a remote control you should feel at home with the familiar up down left ri...

Page 48: ... purpose made cables which feature rugged metal connectors 4 5 1 Connecting the Cable to the Meter Always ensure the LeveLine Meter is switched off prior to connecting or disconnecting a Logger Align the Aquaread logo on the black plug body with the red on off switch on the LeveLine Meter then press the plug into the socket and tighten the retaining collar DO NOT TWIST THE CONNECTOR BODY WITH RESP...

Page 49: ... 048M Hit OK to zero When connected to a Level Logging Probe the BARO value on the top line is derived from the Meter s internal barometric sensor When connected to a Baro Logger the BARO value is derived from the barometric sensor in the Logger When connected to a Level measuring Probe the OK key can be used to zero the level reading as indicated on the bottom line of the display Pressing OK will...

Page 50: ...ters or feet Sats in use The number of satellites the GPS is currently using N A 3 D GPS Receiver status see below 3 D 2 D or A Q These items can be selected as alternative units of measurement See 4 9 1 EC can be displayed as absolute or corrected for temperature See section 4 9 3 4 8 GPS Reception The LeveLine Meter contains a built in GPS receiver and antenna The antenna is situated at the top ...

Page 51: ...er you can use just the arrow keys to navigate through the branches of the menus You don t need to press OK or ESC at each level Measurement Units Temp C Baro mb Level Metres On the Measurement Units screen you have a choice of which units you want to adjust Choose the first line if you want to adjust temperature units Choose line 2 if you want to adjust barometric pressure units Finally line 3 wi...

Page 52: ...nto actual water levels for display on the Meter the data must be corrected for water density Water density is a function of temperature and salinity The Meter already knows the water temperature but in order to take salinity into account you must input a salinity value manually This salinity setting is ignored when the Meter is connected to a CTD type Probe as live salinity data is already availa...

Page 53: ...variation in the Calibration Standard during calibration 4 10 2 Recognising the EC Cell The CTD Probes all have an elongated nose sleeve covering the EC cell contacts The black plastic nose sleeve shown removed on the right of the photo forms an integral working part of the Probe s EC measurement system and MUST be fitted during calibration and measurement for correct operation 4 10 3 EC Calibrati...

Page 54: ...10 4 EC Cell Constant The EC cell constant is an indication of the health of the EC cell Nominally the EC cell constant should be around 1 25 This can vary with different calibration standard values and calibration temperatures If the EC cell constant is reported above 2 00 or below 0 5 carefully clean the EC cell contacts and the inside of the nose sleeve Also check your calibration solution is f...

Page 55: ...isplayed Probe Time Date Time 15 46 37 Date 15 Jun 14 OK Sync to Meter On entry to this screen the Probe s current time and date will be displayed To synchronise the clock in the Probe with the Meter s clock press the OK key After successful setup of the Probe s clock the ACTION SUCCESSFUL message will be displayed Use the ESC key to leave this page after transfer If you press the ESC key before p...

Page 56: ... the Logger s memory will fill up very quickly and you will have massive files to handle when you come to download and analyse your data Also your battery will be depleted quickly For example at a logging rate of 0 2 seconds the LeveLine will be logging 18 000 points per hour This will obviously deplete the available memory extremely quickly Also unless you are monitoring live pumping operations o...

Page 57: ...oastal regions Finally as with all settings once the event logging criteria have been set up transfer the settings to the Logger by pressing the OK key After successful setup of the event logging the ACTION SUCCESSFUL message will be displayed Use the ESC key to leave this page after transfer If you press the ESC key before pressing OK your revised settings will not be transferred to the Logger 4 ...

Page 58: ...Position Move the pointer down to View Sync Position and press the right arrow key or OK The Probe s position screen will be displayed Lat N51 22 8439 Long E001 24 6435 Alt 00050M OK Sync to GPS To transfer the current GPS position and altitude to the Probe press the OK key After successful transfer of the current position the ACTION SUCCESSFUL message will be displayed Use the ESC key to leave th...

Page 59: ... time of deployment using a PC running LeveLink software a LeveLine Meter or a QuickDeploy Key To setup the Probe for manual deployment set the Time field to 00 00 00 and the Date field to Finally select the number of hours you want to log data for If you want to log data for a specific period of time after logging is manually started set the logging duration in whole hours If you want the Probe t...

Page 60: ... key to get to the Main Menu then choose Probe Deployment The Probe Deployment screen will be shown Set Rate Events Set ID Position Start Duration Stop Logging Now The bottom line of this screen will read Stop Logging Now Using the up down arrow keys move the pointer to the bottom line then press the right arrow key or the OK key After logging has been successfully stopped the ACTION SUCCESSFUL me...

Page 61: ...Line Meter to USB adaptor Part No LLM USB AD shown below Ensure the Meter is switched off Connect the LeveLine Meter to USB adaptor to the Meter as shown above then connect to your PC using the LeveLine PC Kit Switch the Meter on Prepare for data transfer by pressing the MR Memory Recall key The Data Set Select screen will be shown Select data set for download to PC ID Borehole 1 045273 Level reco...

Page 62: ...ails of data handling in LeveLink During download of data to a PC the Meter s keypad will be disabled and the up down arrow symbol on line three will disappear Data transfer can only be aborted by clicking on the Abort button within the Level Link software Once data download is complete the keypad and flashing arrow symbol will be re activated and further data can be selected for download to the P...

Page 63: ... 1 Clearing the Meter Memory To clear the Meter s memory select Clear Meter Memory A confirmation screen will be displayed Are you sure you want to clear the meter memory OK YES ESC NO Press OK to confirm or ESC to escape without clearing the memory 4 14 1 2 Clearing the Probe Memory To clear the Probe s memory select Clear Probe Memory A confirmation screen will be displayed Are you sure you want...

Page 64: ... hole in the end of the Probe is also clear If the pressure sensor hole appears to be blocked carefully clear it with a soft tool such as a wooden or plastic toothpick Do not insert any sharp metal tools into the pressure sensor inlet 5 2 Cleaning the EC Cell CTD version only On a regular basis thoroughly clean the inside of the nose sleeve and the four metal EC contacts situated in the EC cell wi...

Page 65: ...t device See section 6 17 Depth Calculation for Third Party Devices for further details 6 2 Connections The LeveLine accessory cable LL EXT TEL AD extension cable to flying lead adaptor for telemetry allows any LeveLine Probe to be connected via a standard LeveLine extension cable EXT LL XM to a third party controller device This accessory terminates with a screened multicore cable which allows ex...

Page 66: ...hen awake As soon as data is ready to be sent the LeveLine will issue a service request to the controller Once the controller has read the data the LeveLine will automatically re enter sleep mode Six Core Cable Usage Core Colour Designation Connection Red Power supply ve 5V 24V DC ve power supply input Black Power supply ve Power supply ground Blue SDI 12 Controller SDI 12 I O line Green RS485 Mus...

Page 67: ...e 0x20 0x7E excluding 0x21 ASCII the packet is terminated by 0x21 ASCII Each command sent to the LeveLine must be preceded by a break frame 12mS high to wake the LeveLine up Response packets have the format a response data crc CR LF where a is the LeveLine s device address character response data is a string of zero or more command dependent data characters values in the range 0x20 0x7E crc when p...

Page 68: ...d is an 8 character vendor identification string AQUAREAD model id is a 6 character device identification string see note below firmware ver is a 3 digit LeveLine firmware version string e g 100 for v1 00 serial nr is the LeveLine s serial number string 8 characters Model Identification Strings For the standard LeveLine Probe the model id is LVLINE For the LeveLine CTD Probe the model id is LL CTD...

Page 69: ... LF time is the time in seconds three digits until the measurement will be ready The LeveLine always places a value of 001 in this field nr values is a single digit 0 9 specifying the number of measurements that will be returned by subsequent Send Data commands The LeveLine always places a value of 2 in this field 6 5 8 Additional Measurements and Request CRC The LeveLine will respond to Additiona...

Page 70: ...digit 1 9 indicating which set of additional measurements is being requested time is the time in seconds three digits until the measurement will be ready The LeveLine always places a value of 000 in this field nr values is a two digit number 00 20 specifying the number of measurements that will be returned by subsequent D commands The LeveLine always places a value of 00 in this field 6 5 11 Start...

Page 71: ...is field nr values is a single digit 0 9 specifying the number of numerical values that will be returned by subsequent D commands The LeveLine always places a value of 0 in this field 6 5 14 Service Request The service request is a signal sent by the LeveLine to indicate that a measurement has been completed and is ready to read Service Request a CR LF 6 5 15 Send Data This command is used by the ...

Page 72: ...t a crc CR LF set is a digit 1 9 indicating which set of measurements is being requested crc is a 3 byte string containing the encoded CRC of the response packet 6 6 SDI 12 Device Address The LeveLine is assigned an SDI 12 device address which is a single character from the set 0 9 A Z a z A LeveLine will only respond to commands beginning with its assigned device address or with the wild card add...

Page 73: ...nt by sending a command to another device preceded by a break frame or by sending a command other than Send Data to the LeveLine After receiving the response to a Start Concurrent Measurement command the data recorder should wait for the measurement time to elapse before requesting the measurements with a Send Data command After a Start Concurrent Measurement command response the data recorder may...

Page 74: ...current Measurement command CTD Probe Command Response a C or a CC a 00106 CR LF a D0 a temperature pressure ABS EC EC 20 EC 25 SAL CR LF or a temperature pressure ABS EC EC 20 EC 25 SAL crc CR LF Where ABS EC is the absolute uncorrected EC value in µS cm EC 20 is EC in µS cm corrected to 20 C EC 25 is EC in µS cm corrected to 25 C SAL is salinity in PSU which is an equivalent to ppt In the event ...

Page 75: ... composed of three characters in the range 0x40 0x7F which encode the 16 bit CRC value as follows 1st character binary 0100C15C14C13C12 2nd character binary 01C11C10C9C8C7C6 3rd character binary 01C5C4C3C2C1C0 where Cn is the nth bit of the CRC The algorithm for calculating the CRC is as follows Set crc 0 For each message character c Set crc crc XOR c Repeat 8 times If least significant bit of crc...

Page 76: ...m the external supply by the standard LeveLine Logger Mini in this mode is less than 10mA The CTD versions draw less than 20mA Six Core Cable Usage Core Colour Designation Connection Red Power supply ve 5V 24V DC ve power supply input Black Power supply ve Power supply ground Blue RS485 B Controller RS485 or B line Green RS485 A Controller RS485 or A line Yellow SDI 12 Modbus Select Power supply v...

Page 77: ...d Size Content a 1 byte Slave address valid values 0x01 0xF7 when a single slave is addressed 0x00 for commands broadcast to all slaves function code 1 byte Function code that identifies the function of the data packet valid values 0x01 0x7F for commands successful responses 0x81 0xFF for exception responses data 0 252 bytes Function dependent data crc 2 bytes 16 bit cyclic redundancy check In bro...

Page 78: ... data address in command 3 Invalid data value in command crc 2 bytes CRC 6 14 2 Read Holding Registers This command reads one or more Modbus holding registers and has the format Field Size Content a 1 byte Slave address function code 1 byte 0x03 start address 2 bytes Base address of the block of registers to be read 0x0000 0xFFFF nr registers 2 bytes The number of registers to be read 0x0001 0x007...

Page 79: ...ize in bytes of values field equal to 2 x nr registers values values size bytes Block of data containing the values of the requested registers 2 bytes per register in order of increasing address from start address onwards crc 2 bytes CRC 6 14 4 Write Holding Register This command writes a value to a single Modbus holding register and has the format Field Size Content a 1 byte Slave address functio...

Page 80: ... 1 The LeveLine will set the registers to the specified values and send a response with the format Field Size Content a 1 byte Slave address function code 1 byte 0x10 start address 2 bytes Base address of the block of registers 0x0000 0xFFFF nr registers 2 bytes The number of registers 0x0001 0x007B crc 2 bytes CRC 6 14 6 Report Slave ID This command allows the master to retrieve identification in...

Page 81: ...ers The characteristics of these classes are shown in the table below Read Only Read Write Single bit Discrete Inputs Coils 16 bit Input Registers Holding Registers Modbus Data Classes The LeveLine implements all of its registers as holding registers or input registers The single bit classes are not used and the command functions for accessing them are not implemented The holding registers allowin...

Page 82: ...ctivity corrected to 25 C μS cm lower 16 bits 10 0x0009 Salinity PSU ppt 100 LeveLine CTD Modbus Input Registers All measurement values are two s complement numbers 6 15 1 Slave Address Holding register 1 contains the LeveLine s slave address which is a value in the range 1 247 It s factory default value is 1 NOTE If a command writes a new value to holding register 1 the slave address contained in...

Page 83: ...LeveLine 6 16 MODBUS Cyclic Redundancy Check The cyclic redundancy check is calculated on the entire contents of the packet starting with the slave address and ending with the last byte before the start of the CRC field The CRC field is composed of the two bytes of the CRC value least significant byte first most significant byte second Note that this is the opposite order to multi byte values in t...

Page 84: ...lready been automatically subtracted from the depth pressure in the probe SAL salinity in PSU is output by the LeveLine CTD model probes only If you are not using a CTD probe and do not have access to live salinity data SAL values of around 0 4 PSU should be used for clean surface water and around 33 0 PSU for sea water 6 17 1 Water Density Calculation Constants Den_R0 3 9863 Den_K03 0 00000082467...

Page 85: ...y necessary repairs will be carried out and your equipment will be returned free of charge If the repair is not covered by the warranty you will be given an estimate for the costs of repair and return carriage Upon receipt of payment your equipment will be repaired and returned Please note The majority of perceived problems can be rectified by careful study of this instruction manual use of the TR...

Page 86: ..._____________________________ Country ______________________________________ Phone ________________________________________ email __________________________________________ Product ______________________________________ Serial No ______________________________________ Contaminant if known ___________________________________________________________________________ Decontamination Procedure ________...

Page 87: ...veLine Meter turns on but turns off again almost immediately Batteries are probably nearly dead or incorrectly fitted Check you have fresh batteries fitted and that they are inserted the correct way round The LeveLine Meter can not find the Probe Probably a poor connection Switch the LeveLine Meter off disconnect the Probe ensure there is no debris or moisture in the plugs and sockets then re conn...

Page 88: ...orary directory for the drivers you downloaded from the Aquaread website If more than one USB Serial Port is showing determine which one is associated with the LeveLine cable by unplugging it then re connecting it then temporarily disable all other USB serial ports as they may be causing interference with communications to the LeveLine Probe 9 DECLARATION OF CONFORMITY Aquaread Ltd declares that t...

Page 89: ...e Stop Deploy Start and Real Time View N A Fastest logging rate 10 per second 1 per minute N A Fastest Modbus output rate 10 per second 10 per second 10 per second Fastest SDI 12 output rate 1 per second 1 per second 1 per second Real time clock note 2 Accurate to 2 second 24 hr period 15 minutes year Accurate to 2 second 24 hr period 15 minutes year N A Pressure Sensor Type Material Piezoresistiv...

Page 90: ...iezoresistive ceramic Range Absolute 10M 33 ft 20M 65 ft 50M 164ft 100M 3268ft 10M 33 ft 20M 65 ft 50M 164ft 100M 3268ft Range Gauge 10M 33 ft 20M 65 ft 50M 164ft 10M 33 ft 20M 65 ft 50M 164ft Maximum pressure Max 2x range Burst 2 5x range Max 2x range Burst 2 5x range Accuracy 25 C note 1 0 05 FS 0 05 FS Accuracy overall note 2 0 1 FS 0 1 FS Resolution 0 002 FS or better 0 002 FS or better Electr...

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