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OPERATIONS & MAINTENANCE MANUAL

1. 8 MS CS MCS CCS M6 C6 MC6 CCG eR eee Ee ica PARE RUE 8 MIGE MCT OCT sian Gin a iia aD UE Hb een 8 M8 ES MES CCR kon E tres ner peior teases eect dest 8 MO C9 MOD CODE ne NEE 8 malins tien avida vakan aline vlan avia 9 Setting a Measurement Quick Set up With Default Parameters sss 9 Voltage Measurement Single ended 9 Voltage Measurement Differential 9 Ratiometric Measurement 9 Tipping Bucket Measurement 10 Counts Measutement m 10 Frequency Measurement seen 10 Period Measurement sessies sridi rH ep DRE n IEEE REN 10 Quadrature Shaft Encoder Measurement essere 11 Notes on Handar 436 Quadrature Ecoder any switch closure output encoders 11 State of e 12 Setting a Measurement Specific Set up With User Defined Parameters 13 Voltage Measurement ss 13 SDI 12 set up command ssssssssesseeeeree enne nennen 13 Examples sss 14 Verification and Reading current Set up 14 Ratiometric Measurement 15 SDI 12 set up command us 15 Examples eU nk URN RUIN Fr TINI IEEE 16 Verification and Reading current Set up 16 Tipping Bucke
2. RUOTE MU 23 Switched Voltage SW D sise 24 Resetting to a Factory Default Configuration ss 24 5 Measurement Configuration Recommendations ssseseene ene 25 Analog measurement Parameters ss 25 Channel Gain Buffering ss 25 Averaging 25 Vref warm up minier e RE sak avsk 26 Switched voltage and Switched voltage warm up time sss 26 Example Setup Tutorials sise 26 AT RE Probeer Aia osan RATER 26 Continuously Powered cete 26 Powered for measurements only 27 Air Temperature Sensor 27 rene ere encart 28 6 Troubleshooting and Maintenance sssssessseeeeeneenene nennen ener 29 Troubleshooting REM 29 Maintenance PED 29 7 Specifications for SDI 12 AnalogPlus module 30 APPENDIX A Command Reference sise 31 APPENDIX B SDI 12 with the Sutron 8200 8200A and 82 10 37 Entering Extended Commands for Configuration Purposes sse 37 Fromthe Front Panel tee eae steer renes 37 From a PC connected to the RS 232 port 37 Logging data from the M1 or M2 commands or from addresses above 9 37 Logging data with multiple data recorders sse 38 Setup two Sutron data recorders with one SDI 12 AnalogPlus module 38 Setup two Sutro
3. 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation Frequency Reading set up aXFm m Measurement number M command number 1 9 Set up measurement with factory defaults aXFm FD m Measurement number M command number 1 9 Set up measurement with specific parameters aXFm tt tstotptitvt wtx m Measurement number M command number 1 9 t Measurement time Default is 1 0 i e 1000mS S Slope Default is 1 00 o Offset Default is 0 00 p Channel refer note1 D or AN4 Default is D i Input type ref note 2 Def is uppercase O floating v Debounce time Default is 0 000 i e OMS w Switched voltage during measurement 0 5 or 12 Default is O x Switched voltage warm up time in sec Default is 0 1 i e 100mS Get Set up aXGm m Measurement number M command number 1 9 Get last 3 parameters of set up aXGm 2 m Measurement number 1 9 w switched voltage x switched voltage time g gain Delete Set up aXGm DEL m Measurement number 1 9 Sutron Corporation SDI 12 Analog Plus Module Users Manual a NC lt CR gt lt LF gt or a t s o p i v lt CR gt lt LF gt a00026 lt CR gt lt LF gt a00026 lt CR gt lt LF gt atm1 m2 m3 m4 m5 m6 m7 m8 m9 lt CR gt lt LF gt a m p n s o i t v lt CR gt lt LF gt m measurement type p measurement channel n reference channel s slope o offse
4. es SDI 12 Analoc Model 6661 1248 17 Manual J OPERATIONS amp MAINTENANCE MANUAL ZOD SDI 12 GND D IN DATA AN4 AnalogPLUS Part No 8800 1145 Rev D October 15 2010 E J LE SV QN En Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 4 A DA 4 I www sutron com sales sutron com Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Table of Contents 1 Introduction sise 1 FealUT6S 1 2 QUICK Stan Series de 2 3 SDI 12 Commands Overview issue 4 Setting the Address see 4 Verifying the Address and Operation 5 Making a Measurement sinn e TR EHE THER ER wees em MERI ed 6 Selecting a measurement command class 6 Always supported ss 6 Multiple long measurement time sensors sss 6 Improved data integrity checking sese 6 Example M command ss 6 C MC and CC commands essere eene en enne cesse eterne rennen 7 Sissi 7 Factory Programmed Default Measurements c cccccesseeseeesecesecececaeecaeeeeeeeeeeeeeneeeeeeeneensees d MSC MCCC e e re p a nn de IDEE 7 MI CI MGI CC ROR M2 2 MOL 66 CC NB C3 MC CO3 iiber WDR EO P RU HERE D rere 8 MA C4 MCA
5. Direction of Rotation The direction of the level measurement can be changed by swapping the wires on DIN and AN4 or by changing the sign of the scale Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation SDI 12 Analog Plus Module Users Manual Rev D 48800 1145 10 2010 23 Average Minimum and Maximum Value Measurement time The SDI AnalogPLUS module can be configured to return two types of results If the measurement time is set to 0 zero it returns two values current level and status byte If the measurement time t is greater than 0 maximum 240 then on a measurement command the module will take 10 readings per second for t seconds and return four results Average Minimum and Maximum value over t seconds followed by status byte If you have configured just one measurement which will normally be the scenario measurement time can be set modified through SDI 12 extended command aXQTt e g OXQT 2 If you have configured more than one quadrature measurement say M3 for current level and M4 for average level you can set measurement time through SDI extended command aXQm X X t e g OXQ44 X X 2 where 2 and 3 X is in uppercase and means don t care Using 0XQS 2 in later scenario will change the measurement time for M3 measurement not for M4 i e whichever is the first one from M1 through M9 Status Byte The las
6. 8V for sensor 1V for module switched V 2V max for current sensing The 2V implies that the maximum value sensing resistor that can be used is 100 ohms Note Even though the 100 ohm resistor would give the highest resolution the SDI 12 AnalogPlus module has sufficient excess resolution that a smaller sensing resistor could be utilized without degrading total sensor accuracy Connect the sensor s positive input to the SW D voltage connection and the sensor s negative side to the ANA analog input AN4 was chosen since it is on the same terminal block as the SW D voltage connection Connect the 100 ohm sense resistor from AN4 to GND With this configuration the module will measure 0 4V when the sensor is output 4 mA 0 feet and 2V when the sensor output is 20 mA 15 feet We want the output to report a 15 foot change for every 1 6 Volt 2V 0 4V change therefore we need a slope of 9 375 Ft V 15 feet 1 6 volts and we need an offset of 3 75 Ft 9 375 ft V 0 4V The other piece of information that is needed is how long the sensor needs power applied before it produces an accurate output For our example sensor we will assume that the sensor needs one second to stabilize and produce an accurate output Therefore to program the M2 command to perform this reading on channel AN4 issue the configuration command aXV2 4 G 9 375 3 75 X X 12 1 U 0 This says that M2 will measure channel 4 with respect to ground Apply a slope of 9 375 and of
7. Type uppercase X to leave a parameter unchanged e g aXRm X 2 will change reference channel to AN2 leaving measurement channel and all other parameters unchanged default if never programmed aXRm X will leave everything unchanged can be used to find switched voltage and it s warm up time A successive 850 gives a p t CR LF It is recommended to use aXSm Command instead of aDO To verify the set up This is because aD0 Command can not return an alphabet If this M or C number is not set for Voltage meas otherwise Returns the current values in set up Sets Voltage measurement with ground as reference channel slope 1 00 offset 0 Averaging time 0 067 Vref warm up time 10mS swd volt 0 Input Unbuffered Gain 0 auto gain Use aXVm Command to verify the set up which reads back all the parameters except w amp x To read these 2 parameters use a successive 850 command after the set up command or aXVm X followed by aDO which returns atst tott v wtx g lt CR gt lt LF gt A successive aD0 gives atstott vt wt x g lt CR gt lt LF gt It is recommended to use aXVm command instead of 850 to verify set up if you are not interested in switched voltage Type uppercase X to unchanged e g leave a parameter aXVm X 2 will change reference channel to AN2 leaving measurement channel and all other parameters unchanged default if never programmed aXVm X will leave everything unchanged can b
8. aXPm or m Measurement number M command number 1 9 a t s o p i v lt CR gt lt LF gt Reading set up Set up measurement with factory defaults aXPm FD m Measurement number M command number 1 9 a00026 lt CR gt lt LF gt Set up measurement with specific parameters aXPm t s o p i v w x m Measurement number M command number 1 9 t Edge wait Default is 1 1 i e 1100mS S Slope Default is 1 00 o Offset Default is 0 00 p Channel refer note1 D or AN4 Default is D i Input type ref note 2 Def is uppercase O floating v Debounce time Default is 0 000 i e Osec w Switched voltage during measurement 0 5 or 12 Default is O x Switched voltage warm up time in sec Default is 0 1 i e 100mS Quadrature Counts a00026 lt CR gt lt LF gt a NC lt CR gt lt LF gt aXQm or m Measurement number M command number 1 9 atotstt lt CR gt lt LF gt Reading set up Set up measurement with factory defaults aXQm FD m Measurement number M command number 1 9 a00023 lt CR gt lt LF gt Set up measurement with specific parameters aXQm o s t m Measurement number M command number 1 9 o Offset Default is 0 00 S Slope Scale factor Default is 0 01 t Measurement time Default is 0 Setting this to 1 or more averages 10 readings second a00023 lt CR gt lt LF gt Ratiometric a NC lt CR gt lt LF gt aXRm or m Measurement number M command nu
9. H Enable internal pull up O floating no pull up or pull down This parameter is valid only when the channel is D otherwise it is ignored and taken as O by default it is O for both the channels v switching de bounce time default 0 000 i e OmS De bounce time limits the minimum period that can be measured e g with 1 mS you can not measure period of signals above 1 kHz w Switched voltage during measurement 0 5 or 12 Default is 0 Switched voltage warm up time in sec Default is 0 1 i e 100mS BON TBS pd Examples Consider configuring M4 to measure period in a module at SDI 12 address 1 e To configure to measure period with factory default parameters use 1XP4 FD Which will configure the M4 command in the module at SDI 12 address to return the period of the signal on DIN channel with factory defaults of slope 1 00 offset 0 with no pull up or pull down de bounce time 0mS Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation 9501 12 Analog Plus Module Users Manual Rev D 8800 1145 10 2010 21 e To set slope to 2 4 and leave all other parameters unchanged default if never programmed use 1XP4 X 2 4 e To configure M4 to measure period with an internal pull up and all other parameters set to factory default use two commands 1XP4 FD followed by 1XP4 X X X X H or one command 1XP4 1 1 1 0 D H FD if you need to specify parameters
10. a00026 lt CR gt lt LF gt a00020 lt CR gt lt LF gt Rev D 8800 1145 10 2010 If this M or C number is not set for tipping bucket otherwise Returns the current values in set up Use aXBm Command to verify the set up Sets tipping bucket measurement with slope 0 02 offset 0 Channel D Initial count 0 Debounce time 0 02sec Input pulled up Use aXBm Command to verify the set up Type uppercase X to leave a parameter unchanged e g aXBm X 2 4 will change offset to 2 4 and leaving all other parameters unchanged default if never programmed aXBm X 2 4 FD will leave slope unchanged default if never programmed sets offset to 2 4 and puts factory default values for all the remaining parameters If this M or C number is not set for Counts meas otherwise Returns the current values in set up Use aXCm Command to verify the set up Sets Counts measurement with slope 1 00 offset 0 Channel D Initial count 0 Debounce time Osec Input open collector floating Use aXCm Command to verify the set up Type uppercase X to leave a parameter unchanged e g aXCm X 2 4 will change offset to 2 4 and leaving all other parameters unchanged default if never programmed aXCm X 2 4 FD will leave slope unchanged default if never programmed sets offset to 2 4 and puts factory default values for rest of the parameters This command erases all measurement setup and restores M1 9 to factory defaults 32
11. excellent stability e Four Analog inputs with Can be configured for Single ended or Differential voltage measurements Reference voltage output for ratiometric sensors bridges and potentiometers 24 bit A D converter 0 5V input range Programmable gain 1 to 128 user specified or Automatic gain o Simultaneous 50Hz and 60Hz noise rejection One digital input with selectable pull up or pull down to support switch closure type inputs Additional digital input for 0 5 V signals shared with Analog channel 4 Frequency measurement 1 Hz to 8 kHz Counts measurement Quadrature Shaft Encoder measurement Programmable switch de bounce times to prevent multiple counts on a single event Programmable switched 5 volts and 12 volts output Low power consumption lt 0 5 mA in standby mode Programmable coefficients for conversion to engineering units such as degrees C Supports SDI 12 version 1 3 Configurable measurement commands Non volatile setup DIN rail mountable with a real spring on the metal clip Pluggable terminal blocks Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation SDI 12 Analog Plus Module Users Manual Rev D 8800 1145 10 2010 2 2 Quick Start The SDI 12 AnalogPlus module arrives ready to use for many voltage measuring applications The module has four pluggable terminal blocks with three connections each One block contains the SDI 1
12. 1145 10 2010 38 Logging data with multiple data recorders Setup two Sutron data recorders with one SDI 12 AnalogPlus module This setup allows for a SDI 12 AnalogPlus module sensor to be logged in two Sutron data recorders at the same time Connect the SDI 12 ground line to both data recorders and the SDI 12 AnalogPlus module Connect the SDI 12 Data line to both data recorders and the SDI 12 AnalogPlus module Connect the SDI 12 power line from one Data recorder to the SDI 12 AnalogPlus module NOTE Measurement time in one of the data loggers should be offset by at least 30 seconds with respect to the other data logger Setup two Sutron Data Recorders with two SDI 12 AnalogPlus modules This setup allows for two SDI 12 AnalogPlus module sensors to be logged in two Sutron Data recorders at the same time Connect the SDI 12 ground line to both data recorders and both SDI 12 AnalogPlus modules Connect the SDI 12 Data line to both data recorders and both SDI 12 AnalogPlus modules Connect the SDI 12 power line from one Data recorder to one SDI 12 AnalogPlus module Connect the SDI 12 power line from the other Data recorder to the other SDI 12 AnalogPlus module e Sensors must have different addresses e Measurement time in one of the data loggers should be offset by 30 seconds with respect to the other datalogger Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corpora
13. Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation 9501 12 Analog Plus Module Users Manual Rev D 8800 1145 10 2010 n aXPm FD Where a SDI address of module m Measurement number M command number 1 9 For example 1 XP4 FD will configure the command in the module at SDI 12 address 1 to measure the period of the signal on the DIN channel with the factory defaults of slope 1 00 offset 0 without any pull up or pull down de bounce time 0mS no switched voltage on SWD port Quadrature Shaft Encoder Measurement To set up a Quadrature Shaft Encoder measurement on channel DIN and AN4 issue the following SDI 12 command aXQm FD Where a SDI 12 address of module m Measurement number M command number 1 9 For example 1XQ9 FD will configure the M9 command in the module at SDI 12 address 1 to measure a Quadrature Shaft Encoder with the factory defaults of feet assuming a wheel with a 1 foot circumference and 100 counts per rotation and to set the current level as the reference zero Issuing a 1M9 followed by a IDO will then return two values the first one will be current level in feet and the second value will be a status byte that will be one of the following 0 Okay 64 Level has never been Set 128 Shaft Over speed detected 192 Level has never been set and Shaft Over speed has been detected Notes on Handar 436 Quadra
14. M or C number is not set for Ratio meas otherwise Returns the current values in set up Sets Ratio measurement with Vref as reference channel slope 1 00 offset 0 Averaging time 0 067 Vref warm up time 10mS swd volt 0 Input Unbuffered Gain 0 auto gain Use aXRm Command to verify the set up which reads back all the parameters except w switched voltage amp x switched voltage warm up time To read these 2 parameters use a successive aD0 command after the set up command or aXRm X followed by aDO which returns atstott v wtx g lt CR gt lt LF gt 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation Sutron Corporation Set up measurement with specific parameters aXRm p n s o t v w x i gl m Measurement number M command number 1 9 p Measurement channel refer note 1 n Reference channel refer note 1 Default is V S Slope Default is 1 00 o Offset Default is 0 00 t Averaging time refer note 3 Default is 0 067 v Vref warm up time Default is 0 010 i e 10mS w Switched voltage during measurement 0 5 or 12 Default is O x Switched voltage warm up time in sec Default is 0 1 i e 100mS i U Unbuffered B Buffered Default is U g Gain 0 1 2 4 8 16 32 64 128 Default is 0 which means auto gain State of Port Reading set up aXSm Set up measurement aXSm p t m Measurement number M comma
15. M3 command to perform this reading issue the command aXR3 1 V 178 84 72 79 X 0 1 0 X B 0 This says that M3 will measure the ratio of channel to vref using a slope of 178 84 and an offset of 72 89 It says to use the default time for averaging but it says to use a tenth of a second for the Vref warm up time It says to leave the switched voltage off during the measurement that we don t care about its warm up time to buffer the input and to use auto gain The thermilinear network is powered off of Vref and appears to the unit as a relatively high impedance voltage divider The resistance of the thermilinear network and the cable s capacitance forms a RC time constant In other words the output will not appear back at the module instantaneously but will be delayed by time that is the product of the resistance of the sensor and the cables capacitance The longer the cable the longer the delay If the sensor needs more time to charge the cable s Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation SDI 12 Analog Plus Module Users Manual Rev D 8800 1145 10 2010 28 capacitance then the Vref warm up time can be lengthened With this configuration if the warm up time is too short the returned voltage will be low resulting in a temperature reading colder than actual For this example a Vref warm up time of 0 1 second was chosen instead of using the default of
16. Ratiometric Measurement The module can measure ratio of voltages between any two of the 6 inputs ANI AN2 AN3 AN4 Vref and ground The measurement is done using high precision delta sigma Analog to Digital A D converter which can be programmed for following parameters e Input Channels Digital Filter for different data output rate averaging time to get different line rejection frequencies Buffered or Non Buffered input Input Gain of 1 2 4 8 16 32 64 or 128 In addition to this you can specify Slope A multiplier to convert ratio to a different engineering unit Offset A constant value to be added to the result after adjusting it with Slope Vref Warm up Time Time Vref should be turned on before taking a measurement Switched Voltage This can be set to 5volts or 12volts if sensor requires an external excitation voltage e Switched Voltage Warm up time Time switched voltage should be present before taking a measurement SDI 12 set up command To set up a Ratio measurement or change a parameter other than default you can use the SDI command aXRm ptn stot t vtwtxtitg Where a SDI address of module m Measurement number M command number 1 9 p Measurement channel 1 AN1 2 AN2 3 AN3 4 AN4 and V Vref n Reference channel Default is Vref 2 5volts s Slope Default is 1 00 o Offset Default is 0 00 t Averaging time less than 0 09 for 15Hz greater than 0 09 and less than 0 19 for 7 5Hz greater than 0
17. be in the 0 to 5V range referenced to the modules ground The unit can measure voltages in this range when it is in the unbuffered mode In the unbuffered mode the input impedance varies with the gain utilized The table below lists the typical input impedance for the different Gains and input ranges Gain Input range Input Impedance typical 1 0 5V 2 5V 4M ohm 2 1 25V 2 M ohm 4 625 mV 1 M ohm 8 312 mV 500 k ohm 16 156 mV 250 k ohm 32 78 mV 125 k ohm 64 39 mV 60 k ohm 128 19 mV 30 k ohm For low impedance voltage output sensors the loading due to the input impedance is insignificant Even for a 1000 ohm output impedance sensor the error is less than 0 03 FS on the gain 1 setting For high impedance sensors a high impedance input buffer can be added to the input This is done by specifying a Buffered measurement The high impedance input buffer accepts signals in the 50 mV to 3 5 V range For this reason it should not be used for sensors with a 0 to 5V output It is also for this reason that Vref 2 5 Volts is recommended as the reference point for a low output high impedance floating sensor such as a pyranometer In such a case the negative output of the sensor would be connected to Vref and the positive output would be connected to the analog input channel Averaging Filtering The SDI 12 analog module has selectable filtering of the input All settings have 50 and 6
18. before input type In the example where all the parameters are X except for the 2 parameter the X means leave the parameter unchanged factory default in this example e 1XP4 X 2 4 FD will leave the pulse wait timeout unchanged default if never programmed sets slope to 2 4 and puts factory default values for all the remaining parameters Verification and Reading current Set up There are 2 options to read set up 1 aXPm 1XP4 in our examples command which returns e atstotp ttvti lt CR gt lt LF gt or at tNC lt CR gt lt LF gt if Mm is not set to measure Time period 2 aXGm 1XG4 command if you are not sure whether Mm measures Time period or something else Refer appendix A for description on XGm command Quadrature Shaft Encoder Measurement To measure Quadrature Counts such as from Quadrature shaft encoder connect the two Quadrature output lines to channel DIN and AN4 and issue the SDI 12 extended command aXQm FD Where a SDI 12 address of module m Measurement number M command number 1 9 FD Instructs module to assume factory defaults Offset 0 00 Scale factor 0 01 Measurement time 0 or aXQm o s t Where a SDI address of module m Measurement number M command number 1 9 o Offset Used to set current level s Scale factor Plus sign before s can be a minus also depending upon required shaft direction t Measurement time in seconds Setting t to 1 or more will
19. both the channels v switching de bounce time default 0 000 i e OmS De bounce time limits the maximum frequency that can be measured If de bounce time is set to 1 mS you can not measure a frequency above 1 kHz w Switched voltage during measurement 0 5 or 12 Default is 0 X Switched voltage warm up time in sec Default is 0 1 i e 100mS 5 spouts Examples Consider configuring M4 to measure frequency in module at SDI 12 address 1 e To configure M4 to measure frequency with factory default parameters use 1XF4 FD Which will configure the M4 command in the module at SDI 12 address 1 to measure the frequency of the signal on the DIN channel with the factory defaults slope 1 00 offset 0 with no pull up or pull down de bounce time 0mS e To change just the time scale to 2 5 seconds to measure very low frequencies use 1XF442 5 e To set the slope to 2 4 and leave all other parameters unchanged default if never programmed use 1XF4 X 2 4 Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation 9501 12 Analog Plus Module Users Manual Rev D 8800 1145 10 2010 20 e To configure M4 to measure frequency with an internal pull up and all other parameters set to factory default use two commands 1XF4 FD followed by 1XF4 X X X X H or one command 1XF4 1 1 0 D H FD if you need to specify parameters before input type In the example where all of par
20. channel information and input type because SDI 12 command DO can not return an alphabetic character To interrogate the channel set up of the Ratio measurement on M5 you may use the aXRS Command which returns Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation 9501 12 Analog Plus Module Users Manual Rev D 8800 1145 10 2010 17 at NC lt CR gt lt LF gt if M5 is not set to measure ratio If you are not sure whether M5 measures ratio or something else you can determine the configuration of the M5 measurement by use of the XG5 command Refer to appendix A for description on the XGm command Tipping Bucket Measurement To measure rain fall connect tipping bucket between channels DIN pulled up and ground SDI 12 set up command To set up a tipping bucket measurement or change a parameter to other than the default you can use the SDI 12 command aXBm s o p t v where SDI address of module Measurement number M command number 1 9 Slope default is 0 01 It is a multiplier to convert number of tips to an engineering unit such as mm Offset default is 0 00 A constant value to be added to the result after adjusting it with Slope Measurement channel reserved for future expansion assumes D for this version Initial count Default is 0 switching de bounce time Default is 0 020 i e 20mS L Enable internal pull down H Enable interna
21. commands to set up and operate the SDI 12 AnalogPlus module are those defined by the SDI 12 specifications plus some extended commands defined by Sutron The commands are in ASCII and all the replies use printable ASCII characters followed by CR lt LF gt The case of the letters is important An A is not the same as an a All commands have three components the device address the command body and the command termination The device address is a single character with values 0 to 9 A to Z and a to z It is the first character of a command It is usually the number 0 the default address as shipped from the factory if data recorder does not have multiple SDI devices connected to it The command body and the responses are shown as a combination of upper and lower case letters The upper case letters are the fixed portions of the command and the lower case letters are the variables or values that are replaced by actual numbers Values are entered in the form of a polarity sign or followed by up to seven digits including a decimal point The command terminator is an exclamation point NOTE ALL SDI 12 COMMANDS ARE UPPER CASE The SDI 12 AnalogPlus module replies to all SDI 12 commands it supports If the SDI 12 AnalogPlus module receives a command it does not support no reply is made The reply to a measurement command M will have one of two forms Where a is the address and the 0000 indicates that
22. dedicated 1 programmable use 0 5V input range Programmable Gain up to 128 Any 2 analog inputs can be measured as a true differential pair not just the difference of two single ended readings 24 bit A D converter Programmable high impedance input buffer 0 05 V to 3 5V 0 02 FS 25 C 5 ppm C typ 10 ppm C max One analog input can be configured to measure digital inputs up to 8 kHz Up to 8 kHz Programmable 20 k Ohm pull up for switch closure inputs Digital inputs support programmable de bounce filtering 2 5V reference 10 mA max Programmable 5V or switched supply voltage 100 mA max 5V output 596 Switched supply drop 0 5V at 10 mA 1 7 V at 100 mA DIN rail with spring loaded metal clip Four pluggable terminal blocks SDI 12 AnalogPlus Module 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation SDI 12 Analog Plus Module Users Manual Rev D 8800 1145 10 2010 31 APPENDIX A Command Reference Request Address Note SDI 12 AnalogPlus module should be the 21 only sensor on the SDI 12 bus when this ka a lt CR gt lt LF gt command is given otherwise this will cause response from all SDI devices resulting in communications collision a lt CR gt lt LF gt Acknowledge active Send Identification 13 supports SDI version 1 3 commands SUTRON manufacturer 1248 1 model number 1 0 hardware revision level sssssss reserved Svvv
23. out over the SDI 12 bus The 8200 will then display the response to the command Logging data from the M1 or M2 commands or from addresses above 9 Beginning with version 3 3 of the software for the 8200 family SDI 12 sensors can be renamed to allow any SDI 12 address or measurement number to be specified To remap an SDI 12 sensor from its default address and parameter number you can use the form SENSOR7a p where SENSOR7 is the name you wish to give the sensor up to 7 characters a is the address of the sensor 0 through and p is the parameter number 1 through 9 EXAMPLE airtempA 1 would read parameter 1 from the SDI 12 device at address A If you wish to use a measurement command other than the default aM then you can use the form SENS5a pMm where SENSS is the name you wish to give the sensor up to 5 characters a is the address of the sensor 0 through p is the parameter number 1 through 9 and m is the measurement command to use EXAMPLE stage0 1M3 would use measurement command M3 to read parameter 1 from the SDI 12 device at address 0 Another feature is that you can define multiple sensors for the same SDI 12 parameter which will allow you to define separate slopes offsets and other processing for the same parameter Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation SDI 12 Analog Plus Module Users Manual Rev D 8800
24. quadrature measurement say M3 for current level and M4 for average level you can set the offset through the SDI 12 extended command aXQm o e g OXQ4 1 0 Using aXQO 1 0 in later scenario will change the offset for M3 measurement not for M4 i e whichever is the first one from M1 through M9 Scale Factor Scale factor is used to convert quadrature counts into desired units in other words it s the least count of measurement Scale Factor Wheel circumference Counts in 1 rotation For example if shaft wheel is 1ft in circumference and one complete rotation gives 100 quadrature counts Scale Factor 1 100 0 01 In order to get the result s in metric units with the same wheel Scale Factor 0 3048 100 0 003048 i e one count is equal to 3 048mm If you have configured just one measurement which will normally be the scenario Scale factor can be set modified through SDI 12 extended command aXQSs e g OXQS 0 01 If you have configured more than one quadrature measurement say M3 for current level in feet and M4 for average level in meters you can set scale factor through SDI 12 extended command aXQm X s e g 0OXQ4 X 0 003048 where 2 X is in uppercase and means don t care and sign before s can be plus or minus depending upon required direction Using OXQS 0 003048 in later scenario will change the scale factor for M3 measurement not for M4 1 e whichever is the first one from M1 through M9
25. the first parameter returned and the RH voltage will be the second parameter returned Powered for measurements only In this case we need to setup a measurement command for both the air temperature and the relative humidity For air temperature we want to use switched 5V with a 3 second warm up time We also want to report degrees C With this sensor zero volts corresponds to 40 C and one volt is 60 C so we have a 100 degree change per volt which gives a slope of 100 Since we need to report 40 for 0 volts the offset should be 40 To configure the M1 command to perform this reading on channel AN2 issue the configuration command aXV14 2 G 100 40 X X 5 3 U 0 This says that M1 will measure channel 2 with respect to ground Apply a slope of 100 and offset of 40 It says to use the default for averaging time and Vref warm up time And it says to perform the measurement unbuffered with an automatic gain To read the air temperature the data recorder would issue the aM 1 command and then about 4 seconds later it would issue the aD0 command to read back the air temperature in degrees C For Relative Humidity we will again want to use switched 5V with a 3 second warm up time We want to report RH With this sensor zero volts corresponds to 0 RH and one volt corresponds to 100 RH so we have 100 change over one volt which gives a slope of 100 We want to report 0 for 0 volts so our offset is 0 To configure the M2 command to perform
26. there is no mE further message from SDI 12 AnalogPlus module to send Or m Where a is the address ttt is the amount of time in seconds aun the SDI 12 AnalogPlus module needs to make the followed b measurement or process the command and n is the number of y values that can be collected As soon as the measurement is over the sensor will also respond with its address if ttt is not 000 This response is called a service request Setting the Address The default SDI 12 address is 0 If you are using the SDI 12 AnalogPlus module connected with other SDI 12 devices you will need to change the SDI 12 AnalogPlus module address Otherwise skip this section The address simply lets multiple devices share the same wiring When the data recorder needs data from a particular sensor it requests data using an address Only the device with the matching address will reply For convenience in setting up the unit when only one sensor is connected the SDI 12 AnalogPlus module supports wildcard addresses of asterisk and question mark In order to set the address by SDI 12 command no other SDI 12 devices connected to the system should be set to address 0 or to the desired SDI 12 AnalogPlus module address Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation 9501 12 Analog Plus Module Users Manual Rev D 8800 1145 10 2010 5 Hint If you do not know the address o
27. this reading on channel AN3 issue the configuration command aXV2 3 G 100 0 X X 5 3 U 0 This says that M2 will measure channel 3 with respect to ground Apply a slope of 100 and offset of 0 It says to use the default for averaging time and Vref warm up time And it says to perform the measurement unbuffered with an automatic gain To read percent relative humidity the data recorder would issue the aM2 command and then about 4 seconds later it would issue the aD0 command to read back the percent relative humidity Air Temperature Sensor The 5600 0020 Air Temperature Sensor includes a thermilinear network that produces a voltage division based upon the temperature Since the output is dependent upon the input voltage we will configure this sensor for a ratio measurement The equation describing the ratio of the output to the input would produce a temperature of 72 79 degrees C at a ratio of zero and a temperature of 106 05 at a ratio of one so we have a 178 84 degree change for a change of in ratio which gives a slope of 178 84 To report 72 79 for a ratio of zero we set the offset to 72 79 For our connections we connect the red lead to Vref the black wire to Ground and the output to ANI We use Vref 2 5V for the supply since it is a ratiometric sensor AN1 was chosen for the input since it is on the same terminal block as Vref and Gnd This allows the sensor to be completely wired on one removable terminal block To configure the
28. 0 Gives a w x lt CR gt lt LF gt 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation SDI 12 Analog Plus Module Users Manual Rev D 8800 1145 10 2010 37 APPENDIX B SDI 12 with the Sutron 8200 8200A and 8210 Entering Extended Commands for Configuration Purposes The Sutron 8200 8210 family of data recorders supports the SDI 12 transparent mode This allows the user to issue commands to the sensor via the data recorder From the Front Panel Go down the menu tree till you come to INSPECT SYSTEM Go right and then down until you come to Enter SDI 12 Cmd Press SET and then the unit will prompt you with Cmd At this point enter the command you wish issued over the SDI 12 bus The command is entered via the arrow keys Remember that the address is always the first character of the command The 8200 will append the to the end of the command for you When you have finished entering the command press SET and the 8200 will send the command and display the response to the command From a PC connected to the RS 232 port From the main menu select I Inspect System From the inspect system menu select E Enter SDI 12 Commands At this point you will be prompted to enter the command Enter the command beginning with the unit s address and ending with an exclamation point Do not forget the exclamation point After entering the command press ENTER to send the command
29. 0 01 second Also since this sensor is relatively high impedance almost 19K at 40 C the high impedance input buffers are enabled We satisfy the requirements for use of the buffers because our input voltage will be in the 0 4V to 1 9V range To read the temperature in degrees C issue the aM3 command and then a couple of seconds later issue the aD0 command to read back the temperature 4 20mA Output Sensor This example is for a water depth sensor 15 foot range that provides a 4 20mA output In this example the sensor will only be powered during measurements and we will assume that the sensor requires 8 volts to operate The SDI 12 AnalogPlus module is a voltage measurement device therefore a precision resistor needs to be used to convert the output current to a voltage A 250 ohm resistor would convert the 20 mA output into a 5V output but the sensor requires at least 8 volts for proper operation so the module would have to supply at least 13 volts 8 volts for the sensor 5 volts for the output to the current loop For most battery powered systems this requirement exceeds the expected voltage from the data recorder and therefore would not work reliably The voltage drop in the switched output powering the 20 mA sensor would typically be less than 0 7 Volts with a maximum of 1 Volt Therefore if in our system we can expect the SDI 12 module to be powered by at least 11 Volts then the allowed sensing voltage drop is 11V min supply
30. 0 Hz rejection For most uses the 15 Hz setting averaging times less than 0 09 is adequate and is the default The measurement times can be increased to add more filtering Specifying a time greater than 0 19 seconds results in the most filtering and will increase the effective resolution by about one bit Noise floor is lower Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation SDI 12 Analog Plus Module Users Manual Rev D 8800 1145 10 2010 26 Vref warm up time The Vref warm up time is the time that the SDI 12 AnalogPlus module allows voltages to stabilize before it takes a reading If a sensor is a ratiometric sensor that is powered off of Vref then the warm up time may have to be increased based upon cable capacitance and sensor stabilization times Many ratiometric sensors are resistive dividers or resistive bridges that are relatively high impedance They may require more time to fully charge the cable capacitance particularly for long cable runs This parameter can be increased to tailor the measurement to the sensor s requirements Switched voltage and Switched voltage warm up time The SDI 12 AnalogPlus module provides a switched voltage output The switched voltage can be programmed to come on for a particular measurement or measurements The voltage level can also be programmed to be either 5V or 12V Note The 12V is the 12 supplied to the module vi
31. 12 Analog Plus Module Users Manual Rev D 8800 1145 10 2010 25 5 Measurement Configuration Recommendations Analog measurement Parameters Channel Gain Buffering Internal to the module all analog measurements are differential just like a voltmeter has two leads to make a differential measurement between them The module allows specification of which input channel is positive Red lead and which is negative black lead In addition to the four analog input terminals the unit also allows specification of the Ground and Vref terminals as an input channel This allows all four channels to be connected to signals of interest if the measurements are single ended referenced to ground Unlike a handheld voltmeter that is powered from an internal battery the module is powered by the SDI 12 connection and is therefore not floating What this means to the user is that the inputs need to be referenced to the same supply as the module This is generally not an issue since powered sensors are usually powered by the module or the same supply as the module For floating sensors this means that a reference connection must be made so the sensor will not float with respect to the SDI 12 AnalogPlus module For a low level high impedance sensor like a pyranometer Vref is the recommended reference point For a high level low impedance sensor like 4 20 mA output Ground would be the recommended reference point All inputs to the SDI 12 AnalogPlus module must
32. 19 for 3 75Hz Default is 0 067 Vref warm up time Default is 0 010 i e 10mS Switched voltage during measurement 0 5 or 12 Default is 0 Switched voltage warm up time in sec Default is 0 1 1 e 100mS U Un buffered B Buffered Default is U Gain 0 1 2 4 8 16 32 64 128 Default is 0 which means auto gain You can do a quick set up by only specifying the measurement channel To ensure that unspecified parameters are at factory defaults suffix the measurement channel with FD Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation SDI 12 Analog Plus Module Users Manual Rev D 48800 1145 10 2010 16 Examples e To configure MS to measure the ratio of the AN2 voltage to Vref with all other parameters set to factory default use 1XR5 2 FD Which will configure the M5 command in the module at SDI 12 address 1 to measure the ratio of the AN2 voltage to Vref with the factory defaults of slope 1 00 offset 0 Averaging time 0 067seconds Vref warm up time 0 010 seconds no switched voltage un buffered input and auto gain e If M5 is currently set to measure something other than Ratio then 1XR5 2 is equivalent to 1XR5 2 FD Note An FD except in place of reference channel is invalid i e 1XR5 FD or 1XR5 2 3 FD or 1XR5 2 3 2 0 FD are all invalid commands e To set M5 to measure the ratio of the AN2
33. 2 connection to the SDI 12 Data Recorder 12V power Ground and Data The other three provide connections for the sensors Right Bottom Left Side To Right Side Top Label Description Label Description SW D Switched Voltage out 5 or 12 Vref Reference Voltage out 2 5V D IN Digital input GND Ground AN4 Analog input 4 optional digital in ANI Analog input 1 Left Side Bottom SDI 12 connection Right Side Bottom Label Description Label Description 12 12V SDI power from recorder AN2 Analog input 2 GND Ground connection to recorder GND Ground DATA SDI 12 data line to recorder AN3 Analog input 3 The unit comes configured from the factory at SDI 12 address 0 and ready to make analog readings Just issue the basic SDI 12 start measurement command M to address 0 0M and the unit will initiate a reading of all four analog inputs Get the data back with a DO command 0D0 done automatically by most data recorders when they are measuring and the unit will return the four voltage readings AN1 AN2 AN3 AN4 If using with other SDI 12 sensors then the unit will need to be set to a unique address This is done with the change address command aAb where a is current address and b is the new address The unit needs to be only SDI 12 module on the bus at address a when this command is issued or you will end up changing both units to a
34. There is no advantage to the concurrent measurement C command when there is only one sensor Improved data integrity checking The measurement command classes with CRC 16 MC and CC offer additional data integrity checking over the non CRC 16 commands M and C The non CRC 16 commands offer data integrity checking in the form of parity and the SDI 12 command structure The CRC 16 commands offer some additional data integrity through the addition of a CRC 16 Since the CRC 16 commands are brand new in SDI 12 version 1 3 not as many data recorders support them In most applications lack of this support on the part of the data recorder will not be missed since non CRC 16 SDI 12 commands still offer significant data integrity checking If the data recorder supports CRC 16 commands then it is recommended to use them when collecting data from this sensor in order to benefit from the increased noise immunity Example M command The format of the M command to the SDI 12 AnalogPlus module is aM a is the address character and mm M is the command to make a measurement Most data recorders will issue this command and automatically handle the reply to collect data You can also issue the command yourself In reply the SDI 12 AnalogPlus module will respond with indicating that after ttt seconds are allowed for the attt4 NEUE measurement 4 values can be collected When the measurement is complete the SDI 12 AnalogPlus module responds with a serv
35. a the SDI 12 bus and as such is unregulated and can vary from 8V to 16V The switched voltage provides a means to power up sensors that only need to be powered for the measurement The switched voltage warm up time allows the user to specify how long the switched voltage must be on before the measurement is taken Note There is only one switched voltage terminal connection Do not connect a 5V only device to the switched voltage and then perform a measurement that has been configured to use a 12V switched voltage because 12V would then be applied to the 5V device Example Setup Tutorials Note all command examples will show the SDI 12 address as a lower case a The a will need to be replaced with the actual address of the module As shipped from the factory this will be the number zero 0 AT RH Probe The 5600 0315 AT RH probe needs a supply voltage of at least 3 5 V and will accept supply voltages up to 16V without any problems It provides two 0 1V outputs Since this sensor can run off of 5 Volts or 12 Volts we have the choice of switched 5 switched 12 or a continuous 5V or 12V The choice would depend upon what other sensors are connected and their requirements since this sensor can accommodate any of the options It should be noted that the minimum excitation time for this sensor is 3 seconds therefore if we are going to use a switched voltage then the warm up time would need to be set to at least 3 seconds To measure bo
36. ace Avvv the software revision If you do not get a reply check the address using or with no other SDI 12 device connected and make sure you use the proper address for the sensor Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation SDI 12 Analog Plus Module Users Manual Rev D 8800 1145 10 2010 6 Making a Measurement There are four classes of measurement commands e Mcommands Measurement Commands SDI 12 V1 0 and later e Ccommands Concurrent Measurement Commands SDI 12 V1 2 and later e MC commands Measurement commands with CRC 16 SDI 12 V1 3 and later and e CC commands Concurrent Measurement Commands with CRC 16 SDI 12 V1 3 and later Selecting a measurement command class Always supported The first requirement is that the data recorder supports the command All SDI 12 data recorders support the non concurrent measurement M command With the M command the data recorder collects data from the sensors one at a time Multiple long measurement time sensors When collecting data from several SDI 12 sensors that have long measurement times utilizing concurrent commands can shorten the complete data collection cycle The data recorder can initiate the measurement on all the sensors and when each finishes then collect the data from all of them Since the measurement times overlap the complete data collection cycle is shorter
37. ameters except the 2 are specified as X the X means leave the parameter unchanged factory default in this example e 1XF4 X 2 4 FD will leave time scale unchanged default if never programmed sets slope to 2 4 and puts factory default values for all the remaining parameters Verification and Reading current Set up There are 2 options to read set up 1 aXFm 1XF4 in our examples command which returns o atstotptttvti lt CR gt lt LF gt or o a tNC lt CR gt lt LF gt if Mm is not set to measure frequency 2 aXGm 1XG4 command if you are not sure whether Mm measures frequency or something else Refer appendix A for description on XGm command Period Measurement The period of a periodic signal can be measured on channel DIN or AN4 Channel DIN can be set up to enable internal pull up or pull down but channel AN4 has no internal pull up or pull down devices SDI 12 set up command To configure for period measurement or change a parameter other than default use aXPm t s o p i v w x Where SDI address of module Measurement number M command number 1 9 Pulse wait time out default is 1 1 second Slope default is 1 00 It is a multiplier to convert Time period to an engineering unit Offset default is 0 00 A constant value to be added to the result after adjusting it with Slope Measurement channel D for DIN and 4 for AN4 Default is D i e DIN L Enable internal pull down
38. an aM1 or aC1 aMCI or aCCI for concurrent CRC The data is still retrieved via an aD0 Voltage Measurement Single ended To set up a voltage measurement on any of the 4 Analog channels issue the SDI command aXVm p FD where a SDI address of module m Measurement number M command number 1 9 p Measurement channel 1 AN1 2 AN2 3 AN3 4 AN4 and V Vref For example 1XV3 2 FD will make M3 command in module number 1 to return a single ended voltage measurement on channel AN2 and with the factory defaults for slope 1 00 offset 0 Averaging time 0 067seconds Vref warm up time 0 010 seconds no switched voltage un buffered input and auto gain Voltage Measurement Differential To set up a differential voltage measurement on any of the 2 out of 4 Analog channels issue the SDI command aXVm ptn where a SDI address of module m Measurement number M command number 1 9 p Measurement channel 1 AN1 2 AN2 3 AN3 4 AN4 and V Vref n Reference channel 1 ANI 2 AN2 3 AN3 4 AN4 V Vref and G ground For example 1XV3 2 3 will configure the M3 command of the module at SDI 12 address 1 to measure the voltage on channel AN2 with respect to voltage on channel AN3 The other parameters slope offset Vref warm up time SW D voltage input type and gain will be left as they were last configured If it is being assumed that the values are at the factory defaults then issue an aXVm p FD command prior to aXVm
39. ddress b For example to change the address from the factory default of 0 to 2 issue the command 0A2 All future commands will then need to be sent to address 2 To query a module as to its address ensure that it is the only SDI 12 module on the bus and then issue the address query command The unit will respond with its address To confirm the SDI 12 communication with a module the SDI 12 send identification command can be issued to address 0 in the example OI The unit will respond with its identification string The string from the SDI 12 AnalogPlus module will look similar to the following 013 SUTRON 1248 11 0 A12 which shows a response from address 0 that the unit supports SDI 12 specification 1 3 and therefore 1 2 1 1 and 1 0 that the manufacturer is SUTRON and that the model is a 1248 1 Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation SDI 12 Analog Plus Module Users Manual Rev D 8800 1145 10 2010 3 If you need more than a 0 5V single ended voltage reading then refer to the measurements section of the manual for further details on configuring the different measurement types Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation SDI 12 Analog Plus Module Users Manual Rev D 8800 1145 10 2010 4 3 SDI 12 Commands Overview The
40. e used to find switched voltage and it s warm up time 35 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation Sutron Corporation SDI 22 Analog Plus Module Users Manual Rev D 8800 1145 Power control aXW s S 0 Always Off S 1 Controlled by M command default S 5 Always 5volts S 12 Always 12volts S other value no effect a0011 lt CR gt lt LF gt Switched Voltage on M command aXWMO w x w 0 No switched voltage on M command default w 5 5volts appear on SWD port on M command w 12 12volts appear on SWD port on M command x switched voltage warm up time in seconds a0012 lt CR gt lt LF gt Note1 For channel numbers use p or n 1 AN1 p or n 2 AN2 p or n 3 AN3 p or n 4 ANA p or n D DIGITAL IN p or n V Vref p or n v Vref with resistance alt connection for internal use p or n G GND p or n g GND with resistance alt connection for internal use Note 2 Input Types Analog i U non buffered i B buffered Digital i M Low voltage level signal in mV i L Meas port pulled low i H Meas port pulled high i O Meas port floating OC Note 3 Averaging Time t lt 0 09 1 reading with 15hz 0 09 lt t lt 0 19 1 reading with 7 5hz t gt 0 19 number of 3 75hz rate rdgs for avg 10 2010 36 A successive aD0 Gives a s lt CR gt lt LF gt S current power mode A successive 85
41. ement is aXSm p t where m Measurement number M command number 1 9 p Measurement channel t Threshold voltage 0 5Vmin 4 5V max for state determination Default is 1 25V For example for the module at SDI 12 address 1 if you want the M6 measurement to return if voltage on AN3 is greater than or equal to 1 9 volts and 0 if less than 1 9 volts use 1XS6 3 1 9 Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation 9501 12 Analog Plus Module Users Manual Rev D 8800 1145 10 2010 13 Setting a Measurement Specific Set up With User Defined Parameters Voltage Measurement The module has four analog ports to take analog voltage measurements The voltage can be measured single ended with respect to ground or differential between 2 channels or between a channel and Vref The measurement is done using a high precision delta sigma Analog to Digital A D converter which can be programmed for following parameters e Input Channels e Digital Filter for different data output rate averaging time to get different line rejection frequencies e Buffered or Non Buffered input e Input Gain of 1 2 4 8 16 32 64 or 128 In addition to this you can specify Slope A multiplier to convert voltage reading to a different engineering unit Offset A constant value to be added to the result after adjusting it with Slope Vref Warm up Time Time Vref
42. f a particular SDI 12 AnalogPlus module use the unknown address command to have the SDI 12 AnalogPlus module identify itself There are 3 forms of the unknown address command NOTE In order for the unknown address command to work there should be only be one SDI 12 module connected The SDI 12 command for setting the SDI 12 AnalogPlus module s address is OAn Where 0 is the current address of the device n is the new SDI 12 address 0 to 9 A to Z a to z The SDI 12 AnalogPlus module will issue a Acknowledge Active response to verify the address set If you do not get this message try the command again NOTE The SDI 12 AnalogPlus module will not respond if the command is invalid As an example the following command would set the SDI 12 AnalogPlus module address to 5 OAS Subsequently the address can be set to a different address 9 for example by the command 5A9 Verifying the Address and Operation The SDI 12 AnalogPlus module will respond with an identifying message when it receives the send identification command I The format of the command is al Where a 1s the address for the SDI 12 AnalogPlus module The SDI 12 AnalogPlus module will reply with a13 SUTRON mmmmmml OsssssssSvvv where a SDI 12 address 13 supports SDI version 1 3 commands SUTRON manufacturer SUTRON mmmmmm model number will return 1248 1 portion of 6661 1248 1 model number hardware revision level Sssssss reserved sp
43. facturing 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 its option replacement of 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 prepay transportation charges to the factory Sutron shall pay transportation for the return of the repaired equipment to the customer when the validity of the damage claim has been established Otherwise Sutron will prepay shipment and bill the customer All shipments shall be accomplished by best way surface freight Sutron shall in no event assume any
44. fset of 3 75 to the output And that the default settings for averaging time and Vref warm up are satisfactory We also say that we need Switched 12 V for this measurement and that it should be turned on for one second before the measurement is taken We chose an unbuffered input since our source impedance is low 100 ohms and we configured the unit to use automatic gain We could have just as well chosen a buffered input for this measurement since the voltage range of interest 0 4V to 2V is within the acceptable window for using buffered inputs To read water level in feet the data recorder would issue the aM2 command and then about 2 seconds later it would issue the aD0 command to read back the water level Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation 9501 12 Analog Plus Module Users Manual Rev D 8800 1145 10 2010 29 6 Troubleshooting and Maintenance Troubleshooting The following checklist will help in troubleshooting problems Possible Cause Faulty wiring check all wiring and terminations sensor There is no fuse in the sensor itself Wrong address requested make sure the data recorder is set up to request data at the proper address Wrong address set in sensor use the identify command to make sure the sensor is responding to the proper address if not double check internal address dip switches since on power up the
45. function of this port is controlled by SDI 12 command aXW s where a SDI 12 address of module S 0 if SW D is required to be always off irrespective of any M command S 1 default SW D gives Ovolts when not taking any measurements During a measurement it has a value set through corresponding measurement set up command S 5 if SW D is required to be always 5volts during idle condition as well during any M command 8 12 if SW D is required to be always 12volts during idle condition as well during any M command S other value no effect Note There is only one switched voltage terminal connection Do not connect a 5V only device to the switched voltage and then perform a measurement that has been configured to use a 12V switched voltage because 12V would then be applied to the 5V device Resetting to a Factory Default Configuration The reset to factory defaults command provides a means to reset most user configurable parameters in a unit back to the factory defaults If the previous history of a unit is not known it is recommended that this command be issued before configuring the unit to ensure a known starting configuration The SDI command for this 1s aXEFD Where a is the SDI address of the module Note It is recommended that the unit be powered down and back up after issuing this command Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation SDI
46. ice request where a is the address character Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation 9501 12 Analog Plus Module Users Manual Rev D 8800 1145 10 2010 7 Note that you still do not have any data from the SDI 12 AnalogPlus module To request the data after a measurement a is the address character and DO is the command to retrieve measured data Note the number zero follows D not the letter O C MC and CC commands The C command is used to make a concurrent measurement It operates identical to the M command except that the SDI 12 AnalogPlus module does not issue a service request when the measurement is complete The MC command is identical to the M command except that the SDI 12 AnalogPlus module adds a CRC to the end of the data The CC command is identical to the C command except that the SDI 12 AnalogPlus module adds a CRC to the end of the data Other Measurements The SDI 12 standard allows for other measurement commands such as M1 M2 etc other current measurement commands such as Cl C2 etc other non concurrent measurements with CRC 16 such as MC2 etc and other concurrent measurement with CRC 16 such as CCI CC2 etc This unit maintains symmetry across all four classes of commands that is it returns the same information to a C1 as it does to a ora MCI or a CCI Remember to issue the aDO Command af
47. in our examples command which returns e atstotp ttvti lt CR gt lt LF gt or e atNC lt CR gt lt LF gt if Mm is not set to measure rain fall 2 aXGm 1XG4 command if you are not sure whether Mm measures rainfall or something else Refer to appendix A for description of the XGm command Count Measurement Counts from an input signal can be measured on channel DIN or AN4 Channel DIN can be set up to have internal pull up or pull down but channel AN4 has no internal pull up or pull down devices SDI 12 set up command To configure for Count measurement or change a parameter other than default you can use the SDI command aXCm s o p t v where a SDI address of module m Measurement number M command number 1 9 s Slope default is 1 00 It is a multiplier to convert number of counts to an engineering unit o Offset default is 0 00 A constant value to be added to the result after adjusting it with Slope p Measurement channel D for DIN and 4 for AN4 Default is D i e DIN t Initial count Default is 0 v switching de bounce time Default is 0 000 i e OmS Note The de bounce time limits the maximum frequency of the signal which can be measured meaning if de bounce time is set to 1mS counts for a 2 KHz signal will be filtered out since the time between input transitions is less than 1 mS L Enable internal pull down H Enable internal pull up O floating no pull up or pull down This parameter is valid onl
48. infall with the factory defaults which are slope 0 01 offset 0 channel DIN with internal pull up initial count 0 de bounce time 20mS Note This takes the module out of a strictly standby mode in that it is continuously accumulating tips Measurements return the current accumulation total Counts Measurement To measure Counts on channel D issue the SDI 12 command aXCm FD where a SDI 12 address of module m Measurement number M command number 1 9 For example 1XC4 FD will configure the M4 command in the module at SDI 12 address 1 to measure the number of counts with the factory defaults which are slope 1 00 offset 0 channel DIN without a pull up or pull down initial count 0 de bounce time 0mS Note This takes the module out of a strictly standby mode in that it is continuously accumulating counts Measurements return the current accumulation total Frequency Measurement To measure Frequency on channel D issue the SDI 12 command aXFm FD Where a SDI address of module m Measurement number M command number 1 9 For example 1 XF4 FD will configure the command in the module at SDI 12 address 1 to measure the frequency of signal on DIN channel with factory defaults for slope 1 00 offset 0 without any pull up or pull down on the input de bounce time 0mS no switched voltage on SWD port Period Measurement To measure period of the signal on channel D issue the SDI 12 command Sutron
49. invoke averaging see below for details For example to configure the M4 to measure level with factory default parameters use 1XQ4 FD this will configure the command in the module at SDI 12 address l to return current level with a resolution of 0 01ft assuming wheel of 1 foot in circumference with 100 counts per rotation and current level as reference or zero reading point Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation SDI 12 Analog Plus Module Users Manual Rev D 48800 1145 10 2010 22 The SDI 12 command 1XQ4 0 0 003048 2 will set the current level as the reference level set a scale factor of 0 003048 and a measurement time of 2 seconds Therefore if wheel is 1ft 0 3048 meter in circumference and one rotation gives 100 quadrature counts the resolution will be 3 048mm and 3 281 rotations of wheel will give 1 meter change in level On receiving an M4 command the SDI module at address 1 will take 20 readings over 2 seconds sending the 1D0 will then return the average minimum and maximum level followed by the status byte Offset Offset is the value of level at the time of measurement set up with respect to reference level If you have configured just one measurement which will normally be the scenario the offset can be set modified through the SDI 12 extended command aXQOo e g OXQO 1 0 If you have configured more than one
50. l pull up O floating no pull up or pull down Default is H we tp on BE Examples Consider setting M4 to measure tipping bucket in SDI 12 module at address 1 e To configure M4 to measure rain fall with the factory default parameters use 1XB4 FD Which will configure the M4 command in the module at SDI 12 address 1 to measure rainfall with factory defaults of slope 0 01 offset 0 channel DIN with internal pull up initial count 0 de bounce time 20mS e To set offset to 2 4 and leave all other parameters unchanged default if never programmed use 1XB4 X 2 4 e To set M4 to measure rainfall with switching de bounce time equal to 10mS and all other parameters set to factory default use two commands 1XB4 FD followed by 1XB4 X X X X 0 010 or one command 1XB4 0 02 0 D 0 0 10 FD if you can specify all the parameters All parameters except the 2 4 are specified as X X means leave the parameter unchanged factory default in this example e 1XB4 X 2 4 FD will leave slope unchanged default if never programmed sets offset to 2 4 and puts factory default values for all the remaining parameters Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation SDI 12 Analog Plus Module Users Manual Rev D 8800 1145 10 2010 18 Verification and Reading current Set up There are 2 options to read the tipping bucket configuration l aXBm 1XB4
51. mber 1 9 Reading set up Set up measurement with factory defaults aXRm p FD m Measurement number M command number 1 9 p Measurement channel refer note 1 a00027 lt CR gt lt LF gt a p n s o t v i g lt CR gt lt LF gt Sutron Corporation SDI 12 Analog Plus Module Users Manual Rev D 8800 1145 10 2010 34 If this M or C number is not set for Period meas otherwise Returns the current values in set up Use aXPm Command to verify the set up Sets Period measurement with Edge wait 1 1sec slope 1 00 offset 0 Channel D Input open collector floating Debounce time 0 000sec Use aXPm Command to verify the set up Type uppercase X to leave a parameter unchanged e g aXPm X 2 4 will change slope to 2 4 and leaving all other parameters unchanged default if never programmed aXPm 2 0 X FD will leave slope unchanged default if never programmed sets Measurement time to 2sec and puts factory default values for all the remaining parameters If this M or C number is not set for Period meas otherwise Returns the current values in set up Sets Quadrature Counts measurement with offset 0 scale factor 0 01 and Measurement time 0 second Type uppercase X to leave a parameter unchanged e g aXQm X 2 4 will change slope to 2 4 and leaving all other parameters unchanged default if never programmed aXPm 2 0 FD will set offset as 2 0 and other two parameters to factory default If this
52. n Data Recorders with two SDI 12 AnalogPlus modules 38 Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com APPENDIX C Dimensions iii tetett trenen nn APPENDIX D Sutron Customer Service Policy 40 APPENDIX E Commercial Warranty siens 41 SUTRON MANUFACTURED EQUIPMENT issues 41 NON SUTRON MANUFACTURED EQUIPMENT ne 41 REPAIR AND RETURN POLICY ccccccccccccscccscceessecssecesseecescesseecueceessecsusesessscssesesseeseenes 41 EXTENDED WARRANTY AND ON SITE 41 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation SDI 12 Analog Plus Module Users Manual Rev D 48800 1145 10 2010 1 1 Introduction The SDI 12 AnalogPlus module has 5 ports to take measurements from vast variety of sensors and transfer the results to a data recorder Three of them AN1 AN2 AN3 are exclusively for analog measurements one DIN is exclusively for digital measurements and AN4 can be used for analog as well as logic level driven digital measurements GND IN DATA AN4 AnalogPLUS Vref ANZ Features e High accuracy amp
53. n 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 the benefits and advantages that Sutron equipment provides We often supply on site introductory training at your facility for no charge You provide the classroom students equipment and coffee we ll provide the instructor On Site Visits Of course not all problems can be fixed over the phone Sometimes a customer needs an on site technician to identify site related problems or troubleshoot a network Sutron can provide these services at a reasonable cost Call for details If you would like to learn more about Sutron products email sales sutron com Thanks again for your order Paul Delisi Customer Service Manager Sutron Corporation Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation SDI 12 Analog Plus Module Users Manual Rev D 8800 1145 10 2010 41 APPENDIX E Commercial Warranty SUTRON MANUFACTURED EQUIPMENT THE SUTRON CORPORATION WARRANTS that the equipment manufactured by its manu
54. nd number 1 9 p Measurement channel refer note 1 t Threshold voltage 0 5Vmin 4 5V max for logic Default is 1 25V Voltage Reading set up aXVm m Measurement number M command number 1 9 Set up measurement with factory defaults aXVm p FD m Measurement number M command number 1 9 p Measurement channel refer note 1 Set up measurement with specific parameters aXVm p n s o t v w x i g m Measurement number M command number 1 9 p Measurement channel refer note 1 n Reference channel refer note 1 Default is G S Slope Default is 1 00 o Offset Default is 0 00 t Averaging time refer note 3 Default is 0 067 v Vref warm up time Default is 0 010 i e 10mS w Switched voltage during measurement 0 5 or 12 Default is O x Switched voltage warm up time in sec Default is 0 1 i e 100mS i U Unbuffered B Buffered Default is U g Gain 0 1 2 4 8 16 32 64 128 Default is 0 which means auto gain 5 12 Analog Plus Module Users Manual a00027 lt CR gt lt LF gt atptt lt CR gt lt LF gt a0022 lt CR gt lt LF gt a NC lt CR gt lt LF gt or atp n s o t v i g lt CR gt lt LF gt a00027 lt CR gt lt LF gt a00027 lt CR gt lt LF gt Rev D 8800 1145 10 2010 A successive aD0 gives atstott v wtx g lt CR gt lt LF gt It is recommended to use aXRm command instead of 850 to verify set up if you are not interested in switched voltage
55. never programmed sets offset to 2 4 and puts factory default values for all the remaining parameters Verification and Reading current Set up There are 2 options to read set up l aXCm 1XC4 in our examples command which returns atstotptt vH CR LF or atNC lt CR gt lt LF gt if Mm is not set to measure Counts 2 aXGm 1XG4 command if you are not sure whether Mm measures Counts or something else Refer to appendix A for description on XGm command Frequency Measurement Frequency can be measured on channel DIN or AN4 Channel DIN can be configured with an internal pull up or pull down but channel AN4 has no internal pull up or pull down devices SDI 12 set up command To set up for frequency measurement or change a parameter other than default use aXFm t s o p i v w x Where SDI address of module Measurement number M command number 1 9 Time scale time period over which the frequency is measured default is 1 second Slope default is 1 00 It is a multiplier to convert frequency to an engineering unit m s or f s Offset default is 0 00 A constant value to be added to the result after adjusting it with Slope Measurement channel D for DIN and 4 for AN4 Default is D i e DIN L Enable internal pull down H Enable internal pull up O floating no pull up or pull down This parameter is valid only when the channel is D otherwise it is ignored and taken as O by default it is O for
56. om sales sutron com Sutron Corporation Sutron Corporation Tipping Bucket Reading set up aXBm m Measurement number M command number 1 9 Set up measurement with factory defaults aXBm FD m Measurement number M command number 1 9 Set up measurement with specific parameters aXBm tstotptttvti m Measurement number M command number 1 9 S Slope Default is 0 02 o Offset Default is 0 00 p Channel refer note1 Default is D t Initial count Default is 0 v Debounce time Default is 0 020 i e 20mS i Input type refer note 2 Default is H pulled up Counts Reading set up aXCm m Measurement number M command number 1 9 Set up measurement with factory defaults aXCm FD m Measurement number M command number 1 9 Set up measurement with specific parameters aXCm stotptttvti m Measurement number M command number 1 9 S Slope Default is 1 00 o Offset Default is 0 00 p Channel refer note1 D or AN4 Default is D t Initial count Default is 0 v Debounce time Default is 0 000 i e OmS i Input type ref note 2 Def is uppercase O floating Erase and Restore Factory Defaults aXEFD SDI 12 Analog Plus Module Users Manual a NC lt CR gt lt LF gt or a s o p t v i lt CR gt lt LF gt a00026 lt CR gt lt LF gt a00026 lt CR gt lt LF gt a NC lt CR gt lt LF gt or a s o p t v i lt CR gt lt LF gt a00026 lt CR gt lt LF gt
57. on com Sutron Corporation SDI 12 Analog Plus Module Users Manual Rev D 8800 1145 10 2010 14 Examples Note Note To set M3 to measure voltage on AN2 with all other parameters set to factory default use 1XV3 2 FD Which will configure the M3 command in the module at SDI 12 address 1 to measure voltage on channel AN2 with the factory defaults of slope 1 00 offset 0 Averaging time 0 067seconds Vref warm up time 0 010 seconds no switched voltage un buffered input and auto gain If M3 is currently set to measure something other than voltage then 1XV3 2 is equivalent to 1XV3 2 FD An FD except in place of reference channel is invalid i e 1XV3 FD or 1XV3 2 3 FD or 1XV3 2 3 2 0 FD are all invalid commands To set M3 to measure the voltage on AN2 with a switched voltage of 5volts and all other parameters set to factory default first use 1XV3 2 FD and then 1XV3 X X X X X X 5 All the X 5 in the example except the 2 X means leave the parameter unchanged factory default in this example Using 1XV3 2 X X X X X 5 instead of sequence of two commands in above example will also do the same but the parameters substituted by X may or may not be factory defaults They depend on what M3 was configured for prior to this set up If M3 is set for something other than voltage then parameters substituted by X will be default voltage measurement parameters If M3 is set
58. p n command to ensure this is true The factory default values are slope 1 00 offset 0 Averaging time 0 067seconds Vref warm up time 0 010 seconds no switched voltage un buffered input and auto gain Ratiometric Measurement To set up a ratiometric measurement on any of the 2 out of 4 Analog channels issue the SDI command aXRm p n where a SDI address of module Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation 9501 12 Analog Plus Module Users Manual Rev D 8800 1145 10 2010 10 m Measurement number M command number 1 9 p Measurement channel 1 ANI 2 AN2 3 AN3 4 AN4 and V Vref n Reference channel 1 ANI 2 AN2 3 AN3 4 AN4 V Vref and G ground For example 1XR3 2 3 will configure the M3 command for the module at SDI 12 address 1 to measure the ratio of voltage AN2 with respect to AN3 If AN3 is 4Volts and AN2 is 3Volts then the returned value will be 0 75 since AN2 is 34 of The other parameters slope offset Vref warm up time SW D voltage input type and gain will be left unchanged Tipping Bucket Measurement To measure rain fall connect tipping bucket between channels DIN pulled up and ground and issue SDI command aXBm FD where a SDI address of module m Measurement number M command number 1 9 For example 1XB4 FD will configure the M4 command in the module at SDI 12 address 1 measure ra
59. 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 90 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 REPAIR AND RETURN POLICY Sutron maintains a repair department at the factory 22400 Davis Drive Sterling Va 20164 Turn around time normally ranges from 10 30 days after Sutron receives equipment for repair Call Customer Service at 703 406 2800 for a Return Material Authorization RMA number Return the defective equipment to the factory transportation charges paid 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 Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com
60. should be turned on before taking a measurement Switched Voltage This can be set to 5volts or 12volts if sensor requires an external excitation voltage e Switched Voltage Warm up time Time switched voltage should be present before taking a measurement SDI 12 set up command To set up a voltage measurement or change a parameter other than default you can use the SDI command aXVm ptnts o tt v wtxtitg where SDI address of module Measurement number M command number 1 9 Measurement channel 1 AN1 2 AN2 3 AN3 4 AN4 and V Vref Reference channel Default is ground Slope Default is 1 00 Offset Default is 0 00 Averaging time less than 0 09 for 15Hz greater than 0 09 and less than 0 19 for 7 5Hz greater than 0 19 for 3 75Hz Default is 0 067 Vref warm up time Default is 0 010 1 e 10mS Switched voltage during measurement 0 5 or 12 Default is 0 Switched voltage warm up time in sec Default is 0 1 i e 100mS U Unbuffered B Buffered Default is U Gain 0 1 2 4 8 16 32 64 128 Default is 0 which means auto gain tTONB UES ju You can do a quick set up by selecting channels only For the omitted parameters the module will retain the previously specified value To ensure that unspecified parameters are at factory defaults suffix the measurement channel with FD Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutr
61. t input type Averaging or measurement time or Initial counts v warm up or debounce time a w x g lt CR gt lt LF gt a00021 lt CR gt lt LF gt Rev D 8800 1145 10 2010 33 If this M or C number is not set for Frequency meas otherwise Returns the current values in set up Use aXFm Command to verify the set up Sets Frequency measurement with Mesurement time 1sec slope 1 00 offset 0 Channel D Input open collector floating Debounce time Osec Use aXFm Command to verify the set up Type uppercase X to unchanged e g leave a parameter aXFm X 2 4 will change slope to 2 4 and leaving all other parameters unchanged default if never programmed aXFm 2 0 X FD will leave slope unchanged default if never programmed sets Measurement time to 2sec and puts factory default values for all the remaining parameters This command returns types of measurement configured for M1 through M9 If a measurement is not configured it s place is substituted by underscore This command returns almost all the set up parameters relevant to a measurement on a particular M number To get remaining 3 parameters SW D voltage during measurement SW D voltage warm up time and Gain if applicable use aXGm 2 Command A successive aD0 Command returns a m lt CR gt lt LF gt 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation Period arNC CR LF
62. t Measurement 17 SDI 12 set up command us 17 Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Examples isis snr eive teet 17 Verification and Reading current Set up 18 Count Measurement sisii 18 SDI 12 set up command ss 18 Examples eR RR hi URN RIEN Er NINE 18 Verification and Reading current Set up 19 Frequency Measurement teste tienne FER Veg e PK PASEO p ee tn RE SG dE 19 SDI 12 set up command ssssssesseseeeeer eene 19 Examples sas eren a arar Wien on ire ns 19 Verification and Reading current Set up 20 Period Measurement pe ete PERI Eepe ra NEE EROPA An RS hE EPRE 20 SDI 12 set up command us 20 Examples sim 20 Verification and Reading current Set up 21 Quadrature Shaft Encoder Measurement essere 21 re E tte eee nes 22 Nene 22 Direction Of Rotation oo viel sie iad ee Re pee 22 Average Minimum and Maximum Value Measurement time 23 Status Byte cipes dign vet dei med 23 Verification and Reading current Set up 23 State of POIL ios REOR REN I ee He KETO 23 Exainple
63. t byte in the response to an aD0 command is the status byte It will be one of the following values 0 No errors 64 The Level has never been Set 128 Shaft Over speed has been detected 192 BOTH the Level has never been set and a Shaft Over speed has been detected Verification and Reading current Set up There are 2 options to read set up 1 aXQm 1XQ4 in our examples command which returns e atot stt lt CR gt lt LF gt or e atNC lt CR gt lt LF gt if Mm is not set to measure Quadrature 2 aXGm 1XG4 command if you are not sure whether Mm measures Quadrature or something else Refer appendix A for description on XGm command State of Port The module supports reading the state of any of the 5 ports The SDI 12 command to configure this measurement is aXSm p t where m Measurement number M command number 1 9 p Measurement channel t Threshold voltage 0 5Vmin 4 5V max Default is 1 25V Example e If in the module at SDI 12 address 1 you want M6 measurement to return 1 if voltage on is greater than or equal to 1 9 volts and 0 if less than 1 9 volts use 1XS6 3 1 9 Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation SDI 12 Analog Plus Module Users Manual Rev D 48800 1145 10 2010 24 Switched Voltage SW D The module supports 2 values of switched voltage Svolts and 12 volts Switched input power on SW D port The
64. ter the measurement is complete in order to retrieve the data Factory Programmed Default Measurements From the factory the following commands will make the defined measurement Issuing an aXEFD will also restore these factory defaults All of the measurements except M C MC or CC can be configured to do other types of measurements or can have user specific parameters as explained in following sections The M C MC or CC will always return the analog readings on ANI AN4 and cannot be reprogrammed The Analog measurements assume these default values Averaging Time 0 067 seconds Vref Warm up Time 10 milli seconds Switched Voltage OFF except in measurement number 6 amp 7 Switched Voltage Warm up time 100 milli seconds Input Un Buffered Gain Auto gain This means that even though an aM3 from the factory does a frequency measurement the aM3 command can be re programmed to perform any other type of measurement M C MC CC Measure Voltage on channel AN1 through AN4 with respect to ground 0 5V scale Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation SDI 12 Analog Plus Module Users Manual Rev D 48800 1145 10 2010 8 MI CI MCI CCI Perform a differential voltage measurement on channel AN2 with respect to channel AN3 2 5V but the voltage on both AN2 and AN3 must be between 0 and 5V M2 C2 MC2 CC2 Measure ratio of ANI voltage
65. th air temperature and relative humidity using the switched excitation would require separate measurement commands being configured for each parameter This also allows the user to specify a slope and offset for each so the module would report degrees C and RH The other choice is to provide continuous excitation to the probe and then utilize the M command to read both channels at once In this case the module would report voltages and the data recorder would have to handle the conversion to degrees C and RH An example of both ways will be given Continuously Powered If there was another sensor that needed the switched voltage out then the AT RH could be powered by the 12V from the data recorder but the recommended connection would be to switched voltage connection since the SDI 12 AnalogPlus module would protect the AT RH Probe from any voltage transients on the SDI 12 bus To continuously power the AT RH probe at 5 volts off of the switched voltage connection issue the aXW 5 Command to the unit To collect the readings issue the aM command to the unit followed a couple of seconds later by the ODO Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation SDI 12 Analog Plus Module Users Manual Rev D 8800 1145 10 2010 27 command If the air temperature output is connected to AN1 and the RH output is connected to AN2 then the air temperature voltage will be
66. the software revision b lt CR gt lt LF gt Set SDI 12 address Voltage Measurement on AN1 through AN4 A successive aD0 Command returns a w x y z lt CR gt lt LF gt Voltage on AN1 w r t ground a00034 lt CR gt lt LF gt Voltage on AN2 w r t ground Voltage on AN3 w r t ground a000304 lt CR gt lt LF gt Voltage on AN4 w r t ground if it is aMC or aCC command then CRC is appended after z Configurable Measurements aM1 aC1 a0tt1 lt CR gt lt LF gt if M cmd aM2 aC2 aM3 aC3 a0tt01 lt CR gt lt LF gt if C cmd Where aM4 aC4 v Measurement result based on what is aM5 aC5 where tt is represents number of configured for this measurement number aM6 aC6 seconds that depends upon Vref time Li l f s 8 aM7 aC7 SW D voltage time Averaging time for if it is aMC or aCC command then CRC is MOJ Ca analog measurements and depens on appended after v aMo a o measurement time for digital aM9 aC9 measurements A successive aD0 Command returns atv lt CR gt lt LF gt Verify Command A successive aD0 Command returns aV a tp tc w i u lt CR gt lt LF gt p Number of power up resets a00015 lt CR gt lt LF gt c Number of clock monitor resets w Number of watchdog resets i Number of Illegal instruction resets u Number of unknown resets To clear the values use extended command aXDV 1 Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron c
67. tion SDI 12 Analog Plus Module Users Manual Rev D 8800 1145 10 2010 39 APPENDIX C Dimensions rm eae IO ee aj L35mm DIN RAIL DIMENSIONS IN INCHES Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation SDI 12 Analog Plus Module Users Manual Rev D 8800 1145 10 2010 40 APPENDIX D Sutron Customer Service Policy CUSTOMER SERM CE 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 applicatio
68. to Vref ANI Vref M3 C3 MC3 CC3 Measure Frequency on channel DIN on a time scale of 1 second M4 C4 MC4 CC4 Perform a differential voltage measurement on channel AN1 with respect to channel ANA 2 5V but the voltage on both AN1 and AN4 must be between 0 and 5V MS C5 MCS CCS Measure ratio of AN2 voltage to Vref M6 C6 MC6 CC6 Measure Voltage on channel AN4 Turn On SW 12volts 100milli seconds before measurement M7 C7 MC7 CC7 Measure Voltage on channel AN4 Turn On SW 5volts 100milli seconds before measurement MS C8 MC CCS Measure Period of a signal on channel DIN with maximum Period of three seconds M9 C9 MC9 CC9 Measure logic level of channel AN4 A low returns 0 and a high returns 1 Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation SDI 12 Analog Plus Module Users Manual Rev D 8800 1145 10 2010 9 4 Measurements Setting a Measurement Quick Set up With Default Parameters When re programming a measurement command to perform a different type of measurement it is best to start with the factory defaults for that measurement type This makes sure that the measurement has a know good starting point NOTE In all of the following cases the m measurement number is the number that would follow the issued command e g if setting up the measurement number 1 then to use the re programmed measurement issue
69. to measure voltage and you need to change just few parameters say Vref warm up time to 30 milli seconds use 1XV3 X X X X X 0 03 Verification and Reading current Set up Sutron Corporation There are 3 options to read set up 1 450 command after XV command 2 aXVm command 1XV3 in our examples 3 aXGm and aXGm 2 commands 1XG3 And 1XG3 2 in our examples All of the different kinds of set up commands return 10027 lt CR gt lt LF gt it may be 3 instead of 1 depending on SDI 12 AnalogPlus module address which means it will return 7 parameters on a successive DO command after 2 seconds The response to DO is 1 stot t vt wtxt g lt CR gt lt LF gt the alphabetic characters in lower case have the same meaning as mentioned above You won t see channel information and input type because SDI 12 command DO can not return an alphabetic character To determine the channel set up of the voltage measurement on M3 you may use the 1XV3 Command which returns 1 p n s o t v i e lt CR gt lt LF gt or 1 NC lt CR gt lt LF gt if M3 is not configured to measure voltage 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation 9501 12 Analog Plus Module Users Manual Rev D 8800 1145 10 2010 15 If you are not sure whether M3 measures voltage or something else you can read the configuration for M3 by using the XG3 command Refer appendix A for a description of the XGm command
70. ture Ecoder any switch closure output encoders The Handar 436 encoder has open collector switch closure outputs Since it does not drive its outputs high an external pull up resistor is required While the DIN port in the module provides an internal pull up for tipping buckets the shared AN4 input can not have any pull ups when used for analog readings To configure the module to read the encoder follow these steps 1 Configure a measurement command as described above 2 Connect two 10 K ohm 20 1 4 watt or better resistors between the sw d voltage and DIN and AN4 3 Set the sw d voltage to a constant 5 volts using the aXW 5 command 4 Connect the encoder outputs to the DIN and AN4 inputs 5 Connect the encoder power to to SDI 12 12 and GND connections To test that the module can now read the encoder issue the measurement command to what ever command number above was used and then issue the aD0 command to read the current level Then rotate the encoder and measure the encoder again to see that the reading changed 1 e for a 1 foot wheel verify one rotation returns 1 foot of change Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation SDI 12 Analog Plus Module Users Manual Rev D 48800 1145 10 2010 12 State of Port The module supports reading the state of any of the 5 inputs The SDI 12 command to configure this measur
71. voltage to the AN4 voltage with a switched voltage of 5 volts and all other parameters set to factory default first use 1XR5 2 FD and then 1XR5 X4 4 X X X X 45 or 1XR5 2 4 X X X X 51 All except the 2 parameter as X X means leave the parameter unchanged factory default in this example Note Using 1XR5 2 4 X X X X 5 instead of the sequence of two commands shown above will also do the same but the parameters substituted by X may or may not be factory defaults It depends on what the M5 command is programmed for prior to this set up If M5 is set for something other than Ratio then parameters substituted by X will be default Ratio measurement parameters e If M5 is set to measure Ratio and you need to change just few parameters say Vref warm up time to 30 milli seconds use 1XR5 X X X X X 0 03 Verification and Reading current Set up There are 3 options to read set up 1 450 command after XR command 2 aXRm 1XR5 in our examples command 3 aXGm and aXGm 2 commands 1XG5 and 1XG5 2 in our examples All of the different kinds of set up commands return a0027 lt CR gt lt LF gt where a is the address of SDI 12 AnalogPlus module 10027 lt CR gt lt LF gt in our examples This means it will return 7 parameters on a successive DO command after 2 seconds The response to DO is atsto tt v w x g lt CR gt lt LF gt the characters in lower case have the same meaning as mentioned above You won t see
72. y override any address set by the software Command or address is wrong case all commands are capital letters make sure address is proper case and commands are upper case Garbled data Multiple sensors set to the same address check address settings of all SDI 12 sensors Remove all other sensors from the recorder and add them one at a time Note SDI 12 communication is defined to be 1200 E 7 1 Command issued to a wild card address or Remove all other sensors from the recorder and try again Maintenance The SDI 12 AnalogPlus module is designed to operate for extended periods with very little or no maintenance required Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation Sutron Corporation SDI 22 Analog Plus Module Users Manual Rev D 8800 1145 10 2010 30 7 Specifications for SDI 12 AnalogPlus module Input Voltage Power Consumption Temperature Range Communication Interfaces SDI 12 Support Analog inputs Analog Accuracy Temperature Coefficient Shared input Dedicated Digital input 1 Input Filtering Reference output Switched Supply Output Mounting Wiring Connections Ordering Information Part Number 6661 1248 1 8 16 VDC lt 0 5mA quiescent 6 mA typ measuring exclusive of current required by sensors 409C to 602 SDI 12 V1 3 will work with V1 0 V1 1 V1 2 and V1 3 data loggers 3
73. y when channel is D Otherwise it is ignored and taken as O by default it is O for both the channels Examples Consider configuring M4 to measure counts from a module at SDI 12 address 1 e To configure M4 to measure counts with factory default parameters use 1XC4 FD Which will configure the M4 command in the module at SDI 12 address 1 to return as the measurement the count of the number of pulses seen since the issuance of the configuration command The measurement will be performed with the factory defaults of slope 1 00 offset 0 channel DIN with no pull up or pull down initial count 0 de bounce time OmS e To set the offset current counts to 2 4 and leave all other parameters unchanged default if never programmed use 1XC4 X 2 4 e To set M4 to measure counts with initial counts equal to 200 and all other parameters set to factory default use two commands 1XC4 FD followed by 1XC4 X X X 200 or one command 1XC4 0 02 0 D 200 FD if you need to specify parameters before initial counts In the example where all parameters are specified as X except for the 2v parameter the X means leave the parameter unchanged factory default in this example Sutron Corporation 22400 Davis Drive Sterling VA 20164 703 406 2800 www sutron com sales sutron com Sutron Corporation 9501 12 Analog Plus Module Users Manual Rev D 8800 1145 10 2010 19 e 1XC4 X 2 4 FD will leave slope unchanged default if

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