Subscribe to Our Youtube Channel
Related Manuals for Sutron SDI-12
Summary of Contents for Sutron SDI-12
- Page 1 SDI‐TB SDI‐12 Tipping Bucket Interface with Smart Compensation Operations & Maintenance Manual Part No. 8800‐1205 Revision 1.1 25 May 2018 ...
-
Page 2: Table Of Contents
Sutron Corporation SDI‐TB Users Manual Rev. 1.1 5/24/2018 pg. 2 TABLE OF CONTENTS Introduction ............................. 3 Quick Start ............................ 3 Unpacking ........................... 3 Operation ........................... 4 Connections ........................ 7 Sensor Configuration ...................... 7 ... -
Page 3: Introduction
Sutron Corporation SDI‐TB Users Manual Rev. 1.1 5/24/2018 pg. 3 1. Introduction The SDI‐TB is an ultra low power, compact and rugged SDI‐12 rain gauge sensor. It can be configured to work with most tipping bucket sizes and configurations and supports a correction polynomial for high rainfall rate compensation. The SDI‐TB also has numerous built in features like programmable daily rainfall reset time, programmable yearly reset. The SDI‐TB sensor has a backup power source that permits un‐interrupted operation for up to 10 hours in case SDI‐12 power is lost. 2. Quick Start 2.1 Unpacking Remove SDI‐TB sensor from the shipping container and visually inspect the unit for signs of damage during shipment. Report any such damage to the factory immediately to ensure a prompt response and resolution. Retain one shipping container in the event a factory return is necessary. Please note that if a return is required, a return material authorization (RMA) number is required. To get this RMA number, call the Sutron Customer Service Department at 703‐406‐2800. ... -
Page 4: Operation
Sutron Corporation SDI‐TB Users Manual Rev. 1.1 5/24/2018 pg. 4 2.2 Operation IMPORTANT: On powering up the SDI‐TB for the first time, the SDI‐TB requires about 2minutes for the internal capacitor to charge up and the supply voltage to get up to the minimum voltage threshold required for the module to be operational. The capacitor typically takes about 10 hours to discharge once completely charged Reading any of these registers will initiate a new measurement and the measured value will be returned. The SDI‐TB provides a standard 3‐wire SDI‐12 bus to interface with any SDI‐12 v1.3 compliant logger and a 2‐wire interface for connection to standard Tipping buckets. Most Tipping buckets consist of a bucket attached to a simple switch. The switch makes a brief contact between the two wires as the bucket tips. The SDI‐TB increments the cumulative total and daily rainfall and raw tip count for each tip it records. The SDI‐TB can be configured to record a tip on a falling edge or rising edge. A pull‐up or pull‐down resistor is automatically active depending on whether a falling edge or rising edge respectively has been configured. A user programmable debouncing duration can be configured to filter out noise during the voltage transitions as the switch makes/breaks contact. The SDI‐TB uses a configurable ‘Bucket size’ or a third order compensation polynomial to convert tips into rainfall. The bucket size indicates the amount of rainfall that corresponds to a single tip of the bucket. By default (if no compensation has been programmed) the SDI‐TB increments the total accumulation after each valid tip. The new accumulations is calculated using the formula Since the bucket takes a finite amount of time to tip over and start filling again, some rain will be lost before the bucket is in position to collect rain again. This amount of rainfall lost will become more ... - Page 5 Sutron Corporation SDI‐TB Users Manual Rev. 1.1 5/24/2018 pg. 5 0.0135 0.013 0.0125 0.012 0.0115 0.011 0.0105 0.01 0.0095 0.009 Rain (inches/hour) The SDI‐TB measures the time between the current tip and the previous tip and uses the bucket size to compute the equivalent rainfall in inches/hour. The polynomial is then used to convert the resultant rainfall in inches/hour to rainfall per tip. If the coefficients have not been configured, the bucket size is used. The SDI‐TB has an internal Real Time Clock (RTC) that is used to keep time and can be programmed to perform daily and annual rainfall resets. The SDI‐TB has a built in rechargeable backup power source that is used to power the module for upto 10 hours of uninterrupted operation in case SDI‐12 power is lost. The current draw will be higher during the charging phase and reduce over time, till the backup power source is completely charged. ...
- Page 6 Sutron Corporation SDI‐TB Users Manual Rev. 1.1 5/24/2018 pg. 6 Fig: Charging current vs Time The internal RTC and Tipping bucket interfaces are fully functional while running off the backup power source. However, the SDI‐12 interface is disabled while running off backup power. The SDI‐12 interface functionality is automatically restored when SDI‐12 power is restored. The SDI‐TB is fully compliant with the SDI protocol v1.3 The ‘D0’ command issued after an ‘M’ command returns various accumulations and counter values. For eg Command = aM! Response = a0005 Command = aD0 Response = a+<acc_last>+<raw_ tip_year>+<acc_year>+<acc_daily>+<acc_yest> <acc_last> = total accumulations since the last M command was issued. Every time an M command is issued, this parameter will be reset. <raw_ tip_year> = The SDI‐TB can be programmed to reset its annual counters/accumulation at the start of a rain year. This parameter returns the total raw tip counts for the current rain‐year. ...
-
Page 7: Connections
Sutron Corporation SDI‐TB Users Manual Rev. 1.1 5/24/2018 pg. 7 2.3 Connections The SDI‐TB sensor is very simple to connect and get working. The unit has a 5 position push header for interfacing with an SDI logger and a standard 2‐wire Tipping bucket. Pin Label Description TB‐IN Connect to the reed switch terminal of the tipping bucket. GND Ground connection for the Tipping bucket SDI‐12 Data Bidirectional SDI data bus GND SDI‐12 interface Ground connection Power (4v‐20v SDI‐12 power from the logger/SDI‐12 master 2.4 Sensor Configuration The SDI‐TB sensors are configured at the factory to the default SDI address 0. If other SDI12 sensors are present on the SDI 12 bus, the address must be changed using the standard ‘address change’ command. Refer to the SDI‐12 command table below for instructions on how to change the address if needed. The SDI‐TB has a default debouncing of 15ms. If the bucket has a switch close time other than 15ms, the appropriate debounce duration can be set using the XDBNC command. ... -
Page 8: Command Reference
Sutron Corporation SDI‐TB Users Manual Rev. 1.1 5/24/2018 pg. 8 It is expected that the user is familiar with the SDI‐12 protocol and this section is written accordingly. 3. Command Reference 3.1 Standard SDI‐12 commands Command Name Command Response Notes Only one SDI‐12 A Query SDI device should be ? ?! where Address connected to the bus a= address since all will respond. Acknowledge a! A ... - Page 9 Sutron Corporation SDI‐TB Users Manual Rev. 1.1 5/24/2018 pg. 9 Command Name Command Response Notes a0005 5 values available in 0 seconds. Use D0 to retrieve data. a+<acc_last>+<raw tip_years> +<acc_year>+<acc_daily>+<acc_yes aM! t> (or MC, C, CC) where: Ex : a = Sensor address Returns the current 8M! M Get <acc_last>=Rainfall since last accumulation values MC accumulation measurement and resets the C ...
- Page 10 Sutron Corporation SDI‐TB Users Manual Rev. 1.1 5/24/2018 pg. 10 ...
-
Page 11: Extended Sdi-12 Commands
Sutron Corporation SDI‐TB Users Manual Rev. 1.1 5/24/2018 pg. 11 3.2 Extended SDI‐12 commands Command Name Command Response Notes aXDT! Command to set the system or time on the SDI12‐TB module. aXDT+yyyy/mm/dd a+yyyy/mm/dd This will be used to perform hh:mm:ss! hh:mm:ss the daily and Yearly rainfall Read/Write resets. current Ex: Ex: If the XDT command is issued XDT system 0XDT+! ... - Page 12 Sutron Corporation SDI‐TB Users Manual Rev. 1.1 5/24/2018 pg. 12 Command Name Command Response Notes aXBKTSZ! Command to configure the or bucket size. aXBKTSZ+<bucket size>! a+<bucket size> The bucket size is used to convert bucket tips into Ex: where: rainfall. If the compensation Read/Write 0XBKTSZ! <bucket size> = coefficients (XCOMP) are not XBKTSZ tipping or Bucket size provided, then each tip is bucket size ...
- Page 13 Sutron Corporation SDI‐TB Users Manual Rev. 1.1 5/24/2018 pg. 13 Command Name Command Response Notes XDBNC Read/Write aXDBNC! a+<debounce_d Command to configure the debouncing uration> debounce duration in or duration milliseconds. aXDBNC+<debounce_dura Ex: tion>! This is used to filter out noisy 0+30 tipping bucket outputs, so that Where the switching noise is not <debounce_duration> = counted as a tip. new debounce duration 0 ≤ debounce_duration ≤ ...
- Page 14 Sutron Corporation SDI‐TB Users Manual Rev. 1.1 5/24/2018 pg. 14 Command Name Command Response Notes XCOMP Read/write aXCOMP ! a+<k3>+<k2>+< The SDI‐TB implements a 3 compensati k1>+<k0> order polynomial to or on compensate for heavy rainfall aXCOMP+<k3>+<k2>+<k1 polynomial rates. >+<k0> coefficients. If no coefficients are provided, where: each tip = <bucket_size>. k3,k2,k1,k0 are The polynomial is of the form ...
-
Page 15: Appendix A: Specifications & Ordering Information
Sutron Corporation SDI‐TB Users Manual Rev. 1.1 5/24/2018 pg. 15 Appendix A: Specifications & Ordering Information MECHANICAL /ENVIRONMENTAL Enclosure Potted enclosure for humid environments Dimensions 3 x 1.5 x 1.5 inches Weight ~60gms Temperature ‐40C to +60C Connector 5 pin screw less connector POWER Input Voltage DC 4v‐20v Initial (capacitor discharged) Power ~2 minutes up delay Internal backup power run time ~10 hours Internal backup power charge time ~18 hours Internal backup power charging 25mA (fully discharged) to 100uA (fully charged) ... -
Page 16: Appendix B: Customer Service Policy
Sutron Corporation SDI‐TB Users Manual Rev. 1.1 5/24/2018 pg. 16 SDI‐TB SDI‐12 tipping bucket interface with internal backup power. Appendix B: Customer Service Policy Dear Customer: Thank you for making the important decision to purchase Sutron equipment. All Sutron equipment is manufactured and tested to the highest quality standards as set by Sutron’s Quality Assurance Department. Our Customer Service Representatives have years of experience with equipment, systems, and services. They are electronic technicians with field and applications experience, not just with a technical background. CUSTOMER PHONE SUPPORT Customer Service Representatives routinely handle a wide variety of questions every day. If questions arise, please feel free to contact me or one of the Customer Service Representatives. We are available from 8:00 am to 5:00 pm Monday through Friday and will be happy to take your call. We can answer most sensor and interface questions on the first call. If we cannot quickly answer a question on an interface, we will work with you until we find a solution. Sometimes a problem is application related. Although we pride ourselves on handling 95% of application related questions over the phone, we maintain constant contact with our Integrated Systems Division and Engineering Division for additional assistance. INTRODUCTORY TRAINING Training is an important part of the Sutron Customer Service philosophy. The Sutron training policy is simple‐‐‐If you buy Sutron equipment, you get Sutron training! Without the proper training, you cannot take advantage of ... - Page 17 Sutron Corporation SDI‐TB Users Manual Rev. 1.1 5/24/2018 pg. 17 ...
-
Page 18: Appendix C: Commercial Warranty
Sutron Corporation SDI‐TB Users Manual Rev. 1.1 5/24/2018 pg. 18 Appendix C: Commercial Warranty SUTRON MANUFACTURED EQUIPMENT THE SUTRON CORPORATION WARRANTS that the equipment manufactured by its Manufacturing Division shall conform to applicable specifications and shall remain free from defects in workmanship and material for a period ending two years from the date of shipment from Sutron’s plant. Sutron’s obligation under this Warranty shall be limited to repair at the factory (22400 Davis Drive, Sterling, VA 20164) or, at Sutron’s option, replacement of the defective product. In no event shall Sutron be responsible for incidental or consequential damages, whether or not foreseeable or whether or not Sutron has knowledge of the possibility of such damages. This Warranty shall not apply to products that have been damaged through negligence, accident, misuse or acts of nature such as floods, fires, earthquakes, lightning strikes, etc. Sutron’s liability, whether in contract or in tort, arising out of warranties or representations, instructions or defects from any cause, shall be limited exclusively to repair or replacement parts under the aforesaid conditions. Sutron requires the return of the defective electronic products or parts to the factory to establish claim under this Warranty. The customer shall pre‐pay transportation charges to the factory. Sutron shall pay transportation charges for the return of the repaired equipment to the customer when the validity of the damage claim has been established. Otherwise, Sutron will pre‐pay shipment and bill the amount to the customer. All shipments shall be accomplished by best‐way surface freight. Sutron shall in no event assume any responsibility for repairs or alterations made other than by Sutron. Any products repaired or replaced under this Warranty will be warranted for the balance of the Warranty period or for a period of 180 days from the repair shipment date, whichever is greater. Products repaired at cost will be warranted for 90 days from the date of shipment. NON‐SUTRON MANUFACTURED EQUIPMENT The above Warranty applies only to products manufactured by Sutron. Equipment provided, but not manufactured by Sutron, is warranted and will be repaired to the extent of and according to the current terms and conditions of the respective equipment manufacturers. EXTENDED WARRANTY AND ON‐SITE MAINTENANCE Extended warranty and on‐site maintenance contracts are available. Price quotations may be obtained from Sutron Customer Service Representatives. ...
Need help?
Do you have a question about the SDI-12 and is the answer not in the manual?
Questions and answers