WATERLOG H-3301/3311
Contents
1. 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 YS 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 CIP 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 http www ysi com terms and conditions php WA2. 01 3311 will resume operation using the current position count If the power is lost long enough to destroy the signature when the power is restored the H 3301 3311 resets the position count to 0000 To intentionally reset the H 3301 3311 s position count disconnect the power for 5 to 10 seconds A backup battery input is also provided to maintain shaft position during main power interruption or loss Any shaft movements while main power is lost will still be recognized and when main power is restored the measured values will reflect the shaft changes while main power was lost Without the backup battery the value would start again at 0 00 plus the current offset value With the shaft pointing toward you rotating the encoder shaft counter clockwise produces an increasing positive shaft position value If this is backwards from your needs either program the slope with a negative value for SDI 12 applications or exchange the two quadrature connections to the shaft encoder for quadrature applications Installation The H 3310 3311 is suitable for outdoor environments but must be installed in a protective enclosure or gauge house Normally the housing is screwed or bolted to a shelf in the gauge station with the pulley and tape protruding over the edge of the shelf above the water Make certain the housing is level and the pulley and tape do not rub on any obstructions Making Output Connections The H 3301 3311 has both a SDI 12 and quadratur
3. ATERL G 501 12 Command amp Response Protocol 2 Command amp Response Protocol Example of an aM Command Command Response Time Values Description a0012 lt cr gt lt If gt 1 sec 2 Return position Subsequent Command Response a X xXX NNNN lt cr gt lt If gt Where X XX Current position stage in user programmable units NNNN Current position in raw position counts CRC ASCII Characters Concurrent Measurement Command Concurrent Measurement is one which occurs while other 501 12 sensors on the bus are also taking measurements This command is similar to the aM command however the nn field has extra digitandthe sensor does not issue a service request when ithas 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 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 aC atttnn lt cr gt lt lf gt Initiate measurement Where a is the sensor address 0 9 A Z C 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
4. OWNERS MANUAL V2 1 WATERLOG H 3301 3311 INCREMENTAL SHAFT ENCODER WITH SDI 12 AND QUADRATURE OUTPUTS D34 0514 a xylem brand CONTENTS amp WARRANTY This user manual is a guide for the H 3301 3311 shaft encoder For more information updated manuals brochures technical notes and supporting software on the H 3301 H 3311 shaft encoder please refer to waterlog com or contact your sales representative For additional assistance please contact us at 1 435 753 2212 or sales waterlog com WaterLOG 1 Chapter 1 Introduction 2 2 2 SN eek 3 Programming the Data 4 Programming the 3301 3311 4 Sa 5 Making Output 5 Words of Call pica 6 TOSUIM EEN 6 Chapter 2 3311 LCD 7 aka 8 Read Button 8 Using the Adjust Knob to Change Current Stage Value 8 Using the Adjust Knob to Change SDI 12 Address 8 Chapter 3 SDI 12 Command and Response Protoco 9 Standard SDI 12 Co
5. TER L G introduction The WaterLOG H 3301 3311 is a digital shaft encoder which measures water depth by monitoring the position of a float and pulley The H 3311 has the same functionality as the H 3301 with the addition of a built in display and manual offset adjustment feature making it easier to setup and use in the field See Chapter 2 for details concerning the LCD display and offset adjust control The H 3301 3311 is easy to use and works with any SDI 12 data recorder For older loggers ALERT systems and the weather service LARK the H 3301 3311 has a quadrature output that is equivalent to the Handar 436A type shaft encoder The Serial Digital Interface is ideal for data logging applications with the following requirements Battery powered operation with minimal current drain Low system cost e Multiple sensors on a simple three wire cable e Up 250 feet of cable between a sensor and the data recorder Use of H 423 501 12 to RS485 converter extends the range to 1000 s of feet The H 3301 3311 has the following features e Scales the encoder position into user units of feet meters etc e Precision dual bearing design with special low temperature lubricant e Threaded shaft compatible with older mechanical shaft encoders e Zero backlash 200 counts per revolution for the SDI 12 output e Sealed enclosure protects from moisture and dirt Low current operation less than 2 milliamps e High speed encode
6. alid the address was out of range or the EEPROM programming operation failed Command Response Description aAn n lt cr gt lt lf gt Change sensor address Where is the current old sensor address 0 9 7 a z An ASCII may be used as a wild card address if the current address is unknown and only one 17 sensor is connected to the bus SDI 12 COMMAND amp RESPONSE PROTOCOL A is an upper case ASCII character n is the new sensor address be programmed 0 9 A Z a z 72 NOTE To verify the new address use the Identify Command Example of a Change Sensor Address command Command Response Description aA 2 lt gt lt gt Change sensor address to 2 Zero the Position Command The Zero Position command resets the encoder position counter internal to the H 3301 3311 This allows for maximum counting range in both the clockwise and counter clockwise directions When the H 3301 3311 is first powered up the position count is automatically reset to zero After the unit has been powered up for some time the Zero Position command provides a means to reset the position counter In most applications the initial position count will be at some undetermined value due to moving the encoder or adjustment of the float cables Before programming the offset term b of the mX b data scaling equation it is important to zero the current pos
7. and Response Description aXRS a0011 lt cr gt lt lf gt Read Slope aXRO 2001 1 lt cr gt lt If gt Read Offset Where a is the sensor address 0 9 A Z a z 12 XRS are upper case characters XRO are upper case characters This command takes 001 seconds to complete and places 1 value in the data buffer Use the command to collect and view the slope or offset Example of an Extended Read User Units Slope command Command Response i Values Description aXRS a0011 lt cr gt lt lf gt 1 Read Slope Command Response Description aDO a 0 005 lt cr gt lt lf gt Slope Reading is 0 005 19 SDI 12 COMMAND amp RESPONSE PROTOCOL Write User Offset and Write User Slope Commands The H 3301 3311 processes the raw shaft encoder position with a mX b equation The slope m and offset b terms are programmable allowing the user to scale the encoder position into other engineering units This command allows the user to write change the slope and offset terms The new value is stored in non volatile EEPROM within the sensor Once the new slope or offset value is written to the EEPROM a copy is sentto the sensor data buffer for verification This data can be viewed by using a subsequent D command To verify the Slope or Offset any other time use the Read User Slope or Read User Offset commands Command Response Description aXWSddd 20011 lt c
8. ange the address in the range of O to 9 When the Read button is released the new SDI 12 address is saved and the display switches to the normal stage readout To change the SDI 12 address again the power must be disconnected and the special power up sequence repeated SDI 12 COMMAND amp RESPONSE PROTOCOL This is a brief description of the Serial Digital Interface SDI 12 Command and Response protocol used by the WATERLOG Series Model H 3301 3311 sensor Included is a description of the commands and data format supported by the H 3301 3311 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 During normal communication the data recorder sends an address together with a command to the H 3301 3311 sensor The H 3301 3311 then replies with a response In the following descriptions SDI 12 commands and responses are enclosed in quotes The SDI 12 address and the command response terminators are defined as follows 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 Z or a z can be used for additional sensors connected to the same SDI 12 bus Address and are wild card address
9. e outputs The H 3301 3311 is an SDI 12 V1 3 compliant sensor It connects directly to any data recorder with SDI 12 capability In addition the H 3301 3311 provides a raw quadrature output for use with other data recorders having a quadrature input The power for the H 3301 3311 is supplied by the SDI 12 12V input Table 1 shows the proper connections Refer to the wiring diagram printed on the side of the H 3301 3311 for the connector pinout Pin 12V DC Ground Ground SDI 12 Data Quadrature Phase A Quadrature Phase B Battery Backup INTRODUCTION Words of Caution e Make certain the encoder s output does not go negative or more than 5 0 Volts e Make certain the ground and power pins are connected to the encoder e Keep the lead wires as short as possible Use shielded cables in noisy environments Testing After completing the installation test the encoder by manually rotating the pulley For the H 3311 press and hold the Read button to observe the display Make certain the readout matches the expected measurement For the H 3301 make an SDI 12 measurement and check for the expected measurement data H 3311 LCD DISPLAY Overview The H 3311 has the same functionality as the H 3301 with the addition of a built in display and manual offset adjustment The LCD display shows the last measured value The display uses ultra low power and is always visible The offset adjustment is a rotary digital encoder and
10. eeds 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 rT Pt ett YSI Incorporated pt att alt tt 1700 1725 Brannum Lane ee so Yellow Springs Ohio 45387 USA BER IEEE Request a Quote Tel 1 435 753 2212 Email sales waterlog com Internet www waterlog com Place an Order Tel 1 937 767 7241 Email orders ysi com Customer Support Tel 1 937 767 2772 2015 Xylem Inc D34 0815
11. encoder position Subsequent Command Response a X xXX NNNN lt cr gt lt If gt Where X XX Current position stage in user programmable units NNNN Current position in raw position counts Measure Command with CRC This Measure command causes a measurement sequence to be performed with a CRC appended to the data 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 or command is executed Command Response Description lt gt lt gt Initiate measurement Where a is the sensor address 0 9 A Z a z 12 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 data buffer If is zero 0 no data will be available using subsequent commands Upon completion of the measurement a service request a lt cr gt lt If gt is sent the data recorder indicating the sensor data is ready The data recorder may wake the sensor with a break and 12 collect the data anytime after the service request is received or the specified processing time has elapsed W
12. erify Command The Verify command causes a verify sequence to be performed The result of this command is similar to the aM 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 or V command is executed Command Response Description av atttn lt cr gt lt If gt Initiate verify sequence Where a is the sensor address 0 7 A Z a z 2 V 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 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 commands Example of an aV command Command Response i Values Description av a0013 lt cr gt lt li gt Return fixed data and diagnostic data for testing purposes Subsequent Command Response aDO a 123 456 78 9 y lt cr gt lt If 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 res
13. es which select any sensor regardless of its actual address Ar Is the last character of a command block lt cr gt lt If gt Are carriage return OD hex and line feed OA hex characters They are the last two characters of a response block Notes e All commands responses are upper case printable ASCII characters e Commands must be terminated with a character e Responses are terminated with lt cr gt lt If 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 M M1 M9 Start Concurrent Measurement Commands Cl C1 C9 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 a 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 commands have a CRC code appended to it 10 WATERL G 501 12 Command amp Response Protocol 2 Command amp Response Protocol Standard SDI 12 Commands aM MakeMeasurement acl Make Concurrent Measurement laoo aROL Make Continuous Measurement av Verify a sendidemtificati
14. ime has elapsed Send Data Command The Send Data command returns sensor data generated as the result of previous aM 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 apd d pd d lt cr gt lt If gt Where a is the sensor address 0 9 A Z a z 2 DO D9 are upper case ASCII characters p Is a polarity sign 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 a lt CR gt lt LF gt only it means that the measurement was aborted and a new M command must be sent The following is an example of the aDO command Example of an aDO command Previous command Response aM a0012 lt cr gt lt lf gt Subsequent Command Response aD0 X XX NNNN lt cr gt lt lf gt Where X XX Current position stage in user programmable units NNNN Current position raw counts in raw position counts 14 WATERL G 501 12 Command amp Response Protocol 2 Command amp Response Protocol Continuous Measurements Sensors that are able to continuously monitor
15. is accessed by removing the attached dust cover The adjustment encoder has a screwdriver slot and is easily rotated with a screwdriver or other flat blade tool Replace the dust cap whenever the adjustment is not being used Read Button Operation The 3311 has a Read button that when pressed will cause the unit to continuously make measurements and update the display The display will flash when the unit is making continuous measurements indicating the display is being updated even if the value is not changing When the button is released the display will freeze with the last measured value displayed Measurement requests from an attached SDI 12 data logger will also cause the display to update Using the Adjust Knob to Change Current Stage Value While the Read button is pressed the Adjust screw may be turned to increase or decrease the current stage value With a positive slope rotating the adjustment screw clock wise to increment the value and counter clock wise to decrement the value Turning the Adjust screw slowly will change the thousandths digit while turning the screw fast changes the tenths digit This allows one control to make both fine and course adjustments Using the Adjust Knob to Change SDI 12 Address If the Read button is held down while the H 3311 is being powered up the display will show the current SDI 12 address The SDI 12 address may be changed using the Adjust screw Turning the Adjust screw will ch
16. is stored in EEPROM within the H 3301 3311 and will not be lost if the power is disconnected The extended commands for changing the slope offset and sensor address 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 different sensor address Many applications use a shaft encoder to monitor water in a stilling well A float and pulley translate the water level to rotation of the encoder s shaft When the H 3301 3311 is installed the encoder will be at a position determined by the current water level When the H 3301 3311 is powered up it resets its internal position count to 0 All subsequent measurements will be relative to this initial position If a measurement in absolute units or stage is wanted you will need to change the OFFSET value to match the current stage as measured by a staff gauge or other datum Incremental encoders such as a quadrature encoders monitor CHANGES in shaft position With an incremental encoder if the power is lostthe encoder reference or zero position is also lost The position count is maintained in RAM not EEPROM within the H 3301 3311 Storing the position in non volatile EEPROM memory would not protect from power loss because encoder position changes would be missed during the loss of power The H 3301 3311 protects its 4 ey position count with a software flag or signature If the power is removed momentarily the H 33
17. ition count This preserves the maximum dynamic range of the H 3301 3311 s 16 bit position counter 32768 raw counts After the position counter is zeroed program the mX b equation to obtain the desired stage using the extended write offset command aXWO Command Response Description 2 a lt cr gt lt lf gt Zero the position counter Where a is the sensor address 0 9 A Z a z 12 XZ are upper case characters This command takes 000 seconds to complete and places no data in the data buffer Example of an Extended Zero the Position command Command Response Description 2 a lt cr gt lt lf gt Reset encoder position 18 WATERLOG 501 12 Command amp Response Protocol 2 Command amp Response Protocol Read User Offset and Read User Slope Commands The H 3301 3311 processes the raw shaft encoder position with a mX b equation The slope m and offset b terms are programmable allowing the user to scale the position into other engineering units These commands allow the user to read the current slope and offset terms The slope is set to 0 005 and the offset to 0 000 at the factory The H 3301 3311 has a mechanical position resolution of 200 counts per revolution When used with a pulley 1 0 feet in circumference 0 005 feet count x 200 counts rev 1 0 feet rev The slope term can be changed for other pulley diameters or for other units such as inches or meters Comm
18. its buffer nn is atwo digit integer 00 99 specifying the number of values that will be placed in the data buffer If 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 Concurrent Measurement Command with CRC The Concurrent Measure with CRC command causes a measurement sequence to be performed with a CRC appended to the data 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 command is executed Command Response Description 13 atttnn lt cr gt lt lf gt Initiate measurement SDI 12 COMMAND amp RESPONSE PROTOCOL Where a is the sensor address 0 9 A Z a z 12 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 nn is a two digit integer 00 99 specifying the number of values that will be placed in the data buffer If is zero 0 no data will be available using subsequent commands The data recorder may wake the sensor with a break and collect the data anytime after the specified processing t
19. mmanda nnnenen 11 Extended SDI 12 Commands Unique H 3301 3311 11 Measure Command 11 Measure Command with 12 Concurrent Measurement 13 Concurrent Measurement Command with CRC 13 Send Data COMmMandan ccccccsessccesscssescesssscesessceseecsscsecsecseeses 14 Continuous 8 15 Continuous Measurements with 15 Send Acknowledge 15 initiate Verity Command rara 16 Send Identification 16 Change Sensor Address enneneeenennennenn 17 Zero the Position Command neneenenennen 18 Read User Offset and Read User Slope Commanda 19 Write User Offset and Write User Slope Commanas 20 ee Stes E 20 Appendix Specifications eeeeneeenennenenn 21 WATERL G EXT 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 unless otherwise specified in the corresponding YSI pricelist or product manual
20. on jal SendAcknowledge Extended SDI 12 Commands Unique to the H 3301 3311 Measure Command The Measure command causes a measurement sequence to be performed 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 command is executed Command Response Description aM attin lt cr gt lt lf gt Initiate measurement Where a is the sensor address 0 9 A Z 2 11 M is an upper case ASCII character SDI 12 COMMAND amp RESPONSE PROTOCOL 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 single digit integer 0 9 specifying the number of values that will be placed in the data buffer If is zero 0 no data will be available using subsequent 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 anytime after the service request is received or the specified processing time has elapsed Example of an aM Command Command Response Time Values Description aM a0012 lt cr gt lt lf gt 1 sec 2 Return
21. ponds with sensor vendor model and version data Any measurement data in the sensor s buffer is not disturbed 16 WATERL G 501 12 Command amp Response Protocol 2 Command amp Response Protocol Command Response Tall allccccecccemmmmmmvvvxx xx lt cr gt lt lf gt Where a is the sensor address 0 9 A Z 2 is an upper case ASCII character II is the SDI 12 version compatibility level e g version 1 3 is represented as 13 is an 8 character vendor identification to be specified by the vendor and usually the form of a company name or its abbreviation mmmmmm is 6 character field specifying the sensor model number is 3 character field specifying the sensor version number 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 an al command a12 DAAH 330 1vvvS nnnnnnVkkk lt cr gt lt If gt H 3311 implementation of the optional 13 character field S nnnnnnVkkk 12 bytes total Where nnnnnn is a six character sensor serial number kkk is a three digit sensor firmware revision level Change Sensor Address The Change Sensor Address command allows the sensor address to be changed The address is stored in non volatile EEPROM within the sensor The H 3301 3311 will not respond if the command was inv
22. put Current Shaft Position SDI 12 amp 2 Wire 200 counts rev 100 counts rev 15 rev sec Open Drain optional factory installed pull up resistor to 5 0 V 5 0V Transguard 1200 SDI 12 7 bit even parity 1 stop bit 13 3 5 volts 0 8 volts 250 ft 9 6 to 16 Volts DC Less than 2 0mA Environmental Operating Temperature Storage Temperature Humidity Mechanical Bearing Starting Torque Shaft Shaft Length Shaft Clearance Shaft Tread Thread Length Material Size Connector Bulkhead Cable Specifications 40 to 60 50 to 70 C 0 to 100 Double bearing with external seal and 1 12 in separation 0 15 oz in typical 0 50 oz in max over temperature 5 16 in compatible with Stevens Fisher and Porter pulleys and accessories 2 00 in ZS 24 threads per in 0 75 in Anodized Aluminum 7 in wide base plate 4 1 4 in high 4 in deep not including shaft or connectors Amphenol MS3102R16S 1P 7 pin male Amphenol 53106 165 15 7 pin female One cable provided with the H 3301 3311 Warranty The WaterLOG H 3301 H 3311 is warranted against defects in materials and workmanship for two years from the date of shipment 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 n
23. r circuitry prevents missing counts due to rapid float movement from wave action or sudden movement in freeze thaw conditions 15 ft sec typical e Water resistant connectors provide easy hookup The LCD display on the H 3311 provides the following additional features e Continuous display readout always shows last measured value e Read button causes the 3311 to continuously update the display while the button is pressed e The adjust knob allows the user to manually set the stage e The adjust knob allows the user to manually set the sensor SDI 12 address Operation The H 3301 3311 is a precision shaft encoder with a resolution of two hundred counts per revolution 0 005 ft with a 1 ft circumference pulley The H 3301 3311 has an internal microprocessor controlled digital counter which monitors two digital outputs from a shaft position sensor The sensor generates quadrature pulses and phase information The phase information indicates which direction the shaft is turning The H 3301 3311 continuously maintains a digital count representing the current position of the shaft The H 3301 3311 counts to 32 768 steps During normal operation the SDI 12 data recorder sends an address followed by a measurement command to the H 3301 3311 sensor The H 3301 3311 wakes up from its low power sleep mode converts the shaft position into Feet Meters or other units programmed for the stage 3 measurement and stores this data in its data buffer Once
24. r gt lt lf gt Write Slope aXWOddd 20011 lt cr gt lt lf gt Write Offset Where a is the sensor address 0 9 A Z a z 2 XWS are upper case characters XWO are upper case characters ddd is the new slope or offset value The input format is very flexible Some examples shown below 20 0 0 195 500 Example of an Extended Write User Units Slope command Command Response Time Values Description axWS1 234 a0011 lt cr gt lt lf gt 1 sec 1 Write Slope Command Response Description 0 a 1 234 lt cr gt lt If gt Slope verified at 1 234 Test Display This command tests the individual segments of the display by cycling through the numbers 0 9 in each of the different positions on the display followed by displaying the numbers 100 1000 and 10000 to test the decimal locations Command Response Description aXTD a0200 lt cr gt lt If gt Test Display Where 20 a is the sensor address 0 9 A Z a z 12 XTD are upper case characters WATERL G 501 12 Command amp Response Protocol 2 Command amp Response Protocol Appendix A General Input Outputs Quadrature Resolution SDI Resolution Quadrature Max rate Quadrature Output Type Transient Protection SDI 12 Output Baud Rate Protocol Version Output Voltage Levels minimum high level maximum low level maximum cable length Power Requirements Voltage In
25. the data 15 ready the data recorder collects the data from the H 3301 3311 s data buffer INTRODUCTION Programming The Data Recorder You must prepare your data recorder to receive and record the H 3301 3311 data Since data recorders differ widely refer to your recorder manufacturer s directions The H 3301 3311 maintains two values or parameters about the shaft position the Stage in the selected engineering units and the Absolute Shaft Position in single unit steps In general program your data recorder to record one or two values from the H 3301 3311 via the SDI 12 port Usually only the first value is recorded The data recorder must issue an command then collect the data with a aDO command as explained in Chapter 3 The H 3301 3311 places two data values in its data buffer atXX XX NNNN Where a Is the the SDI 12 address 0 9 A Z XX XX Is the current encoder position Stage in user units Feet Meters etc NNNN Is the current absolute encoder position in units of steps raw counts Programming The H 3301 3311 The H 3301 3311 comes from the factory with the following settings SDI Address 0 Slope 0 0050 Offset 0 000 With these values Stage will be in units of feet when used with a pulley having a circumference of 12 inches The slope value can be changed to accommodate other pulley circumferences or to change the data to other engineering units such as inches or Meters The Address Slope and Offset setup
26. the phenomena to be measured such as a cable position do not require a Start Measurement command They can be read directly with the R commands RO R9 The 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 command The H 3301 3311 supports the aRO continuous measurement command Example of an aRO command Command Response a X xXX NNNN lt cr gt lt If gt Current position stage in user programmable units Current position raw counts in raw position counts Continuous Measurements with CRC The Continuous Measurement with CRC command makes a measurement sequence with a CRC appended to the data The H 3301 3311 supports the aRCO continuous measurement command Example of an aRCO command Command Response aRCO lt gt lt 1 Where X XX Current position stage in user programmable units NNNN Current position raw counts in raw position counts CRC ASCII Characters 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 al a lt cr gt lt If gt Where a is the sensor address 0 9 A Z a z 15 SDI 12 COMMAND amp RESPONSE PROTOCOL Initiate V
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