LP SD18 – Sunshine Duration Sensor ENGLISH
Contents
1. The quality level of our instruments is the result of continuous product development This can lead to differences between the information written in this manual and the instrument you have purchased We can not entirely exclude errors in the manual for which we apologize The data figures and descriptions contained in this manual can not be legally asserted We reserve the right to make changes and corrections without notice DELTA OHM srl VIA G MARCONI 5 35030 CASELLE DI SELVAZZANO PD ITALY TEL 0039 049 89 77 150 FAX 0039 049 63 55 96 e mail info deltaohm com Web Site www deltaohm com aios2. 3 5 10 1 8 7 RS485 MODBUS RTU Communication Both LP SD18 1x and LP SD18 2x are equipped with a RS485 MODBUS RTU protocol output Before connecting the Sunshine Duration Sensor to the RS485 network it is necessary to assign it an address and set the communication parameters when different from those set by the factory The setting of the parameters is made by connecting the Sunshine Duration Sensor to a PC by using the supplied 8 pin M12 plug or the CP18 optional cable and an RS485 USB for ex RS48 or RS485 RS232 converter SDS M12 male connector CP18 Cable RS485 USB RS485 RS232 Fig 10 PC connection If an RS485 USB converter is used it is necessary to install the relevant USB drivers in the PC NOTES ON THE INSTALLATION OF UNSIGNED USB DRIVER before installing unsigned USB driver into Windows 7 and 8 operating systems it is necessary to restart the PC by disabling the driver signing request If the operating system is 64 bit even after installation the request of driver signing have to be disabled each time the PC is restarted Disabling is not necessary if the cable RS48 is used PROCEDURE FOR SETTING THE PARAMETERS 1 Start when the Sunshine Duration Sensor is not supplied 2 Start a serial communication program as Hyperterminal for instance Set the Baud Rate to 57600 and set the communication parameters as follows data bits 8 parity none stop bits 2 In the program set the COM port
3. crystals During loading avoid wetting or touching the material with the hands as it loses the power desiccant The operations to be performed in a dry place as far as possible are the following 1 unscrew the cartridge containing the silica gel by using a coin 2 remove the cartridge perforated cap 3 open the envelope supplied with the sunshine duration sensor containing the silica gel 4 fill the cartridge with the silica gel 5 close the cartridge with its own cap by making sure the O ring seal is correctly located 6 screw the cartridge to the body of the sunshine duration sensor by using a coin 7 check that the cartridge is properly screwed otherwise the duration of the drying capacity of the silica gel is strongly reduced Fig 1 briefly illustrates the operations necessary for filling the cartridge with the silica gel Silica gel LP SG cartridge lt gt Sealed sachet of J rs silica gel crystals nee Perforated B LPG Closing the PUD Da cartridge J D ey ay D Fig 1 filling the cartridge with the silica gel al i 5 Installation of the sunshine duration sensor The sunshine duration sensor should be installed in a place easy to be reached for the periodical cleaning of the glass and the maintenance At the same time it should be avoided that buildings trees or obstructions of any kind exceed the
4. horizontal plane on which the sunshine duration is placed It is acceptable to choose a location where obstacles in the path of the sun from sunrise to sunset is less than 5 from the horizontal plane of the sunshine duration sensor It should be also checked that there are no reflective elements that may alter the measure The LP SD18 does not need any positioning adjustment during the year Three installation methods are possible e LP SD18 xB basic version for installation on a flat base by using the support included The Sunshine Duration Sensor has a fixed inclination of 45 with respect to the fixing plane Fig 2 basic version LP SD18 xB e LP SD18 xO version for installation on the base LP SD18 0O The base allows the inclination of the sensor up to 80 respect to the vertical so to fit it to the position of the sun to the latitude of the place of installation Two adjustable feet and one fixed foot allow to put the sensor on an horizontal plane Fig 3 installation on the base LP SD18 0 e LP SD18 xV version for installation on a vertical 40 mm mast by using the LP SD18 V support This support allows to tilt the sensor up to 80 respect to the vertical so to fit it to the position of the sun to the latitude of the place of installation Fig 4 installation on a vertical mast by using the LP SD18 V support LP D18 xB LPSD18 19 M5x15 INOX A2 D5 UNI 6592 LPSD18 20 M6 UNI5588 INOX A2 D6 U
5. sunshine duration sensor on a horizontal plane Two adjustable feet and one fixed foot Allows the inclination of the sensor up to 80 from the vertical to suit the position of the sun to the latitude of the place of installation Support for installation of the sunshine duration sensor on a mast 40 mm Allows the inclination of the sensor up to 80 from the vertical to suit the position of the sun to the latitude of the place of installation Basic support for installation of the sunshine duration sensor on a plane The Sunshine duration sensor has 45 fixed inclination with respect to the fixing plane Support for installation of the base LP SD18 0 on a 40 mm mast 40mm mast 1 5 m length for version V M37x2 mm thread 40mm mast 750 mm length for version V M37x2 mm thread Cartridge for containing crystals of silica gel with O ring Pack of 5 cartridges of the silica gel 12 pole cable 5 m long 8 pin M12 connector on one side free wires on the other side 12 pole cable 10 m long 8 pin M12 connector on one side free wires on the other side RS485 connection cable with built in USB RS485 converter The cable is equipped with a USB connector for the connection to a PC on one side and 3 separated wires on the instrument side Heating option for installation in harsh climates for the removal of ice and snow Activation of heating below 6 C Power absorbed by heating 5W 12 Vdc l1 IGVeoltea OHMI
6. 0 minutes with 16 bit integer radiation gt 120 W m number between 0 and 60 for each interval of 10 s in the last 10 minutes is counted a 1 if SRD gt 120 W m for at least 5 s For a higher resolution use the register number 5 7 Status of the sun presence absence contact 16 bit integer 0 SRD lt 120 W m open contact 1 SRD gt 120 W m closed contact Po 8 7 Status of heating 0 off 1 on 16 bit integer Temperature in C x10 below which the heating turns 16 bit integer on 10 Circular counter from O to 32767 of the measuring cycles 16 bit integer It is increased after each measurement 10 Change of the heating activation temperature The temperature below which the heating turns on can be changed by using O6h function code Write Single Register to write the value in the Holding Register number 3 address 2 The value must be set in tenths of degrees between 450 45 0 C and 700 70 0 C The write 06h function changes only the value in the RAM memory the change is therefore cancelled in case of power supply failure in the instrument To make the change permanent write the hexadecimal value FFOO in the Coil Register number 3 address 2 by using the O5h function code Write Single Coil To check if the permanent storage has been completed successfully verify that the Holding Register number 2 address 1 contains the value 0 by using the O3h function code Read Holding Registers MODB
7. ENGLISH Nella OHM LP SD18 Sunshine Duration Sensor Rev 1 2 18 03 2014 1 Introduction The Sunshine Duration sensor LP SD18 measures status and sunshine duration The WMO World Meteorological Organization defines the sunshine duration as the time during which the direct solar radiation exceeds the level of 120 W m The LP SD18 performs the measure of radiation with an array of photodiodes arranged in a particular geometry which allows to obtain an accurate measurement in any weather conditions This solution avoids the use of mechanical moving parts and ensures high reliability over time The instrument besides indicating the presence of sun as required by the WMO measures also direct radiation SRD therefore it can be used as a low cost alternative to a pyrheliometer which use is bound to a solar tracker The instrument is available in three versions which differ in the type of output LP SD18 1 RS485 MODBUS RTU output and volt free contact output contact closed SRD 120 W m contact open SRD lt 120 W m LP SD18 2 RS485 MODBUS RTU output analog voltage output 0 1 Vdc which corresponds to 0 2000 W m of direct radiation and digital output voltage digital voltage output 1V SRD 120 W m OV SRD lt 120 W m LP SD18 3 SDI 12 output and volt free contact output contact closed SRD 120 W m contact open SRD lt 120 W m The LP SD18 is equipped with a heating eleme
8. NI 6592 D6 UNI 1751 LPSD18 21 M4x12 UNI5931 INOX A2 Fixed installation on a flat base LP D18 xV M6 UNI5588 INOX A2 D6 UNI 6592 D6 UNI 1751 M8 UNI5588 INOX A2 LPSD18 13 M8x45 UNI5923 INOX A2 HD2013 2 M6 UNI5588 INOX A2 LPSD18 22K HD2003 83 HD2003 83 1 a Adjustable installation on a mast with levelling device LP SD18 xO LPSD18 11 LPSD18 15 LPSD18 14 LPSD18 12 M6 LPSD18 16 fee BK SAIS Weal KN DM ini ay N 1 5 5 C LLA L ST a WLLL CR YA Bubble level M4x12 UNI5931 INOX A2 Adjustable installation on a flat base with levelling device Fig 5 details of the installation Before orienting the Sunshine Duration Sensor to its final position place it vertically and adjust the base for installation on a plane or support for installation on a 40 mm mast feet so that the level on the upper side of the instrument is perfectly levelled Fig 6 Fig 6 Levelling of the Sunshine Duration Sensor Orient the Sunshine Duration Sensor so that the index of the graduated scale of the support matches the value 90 Latitude and the top where the spirit level is placed is directed towards the NORTH pole if used in the northern hemisphere or towards south if used in the southern hemisphere Fig 7 Latitude Fig 7 Orientation of the Sunshine Duration Sensor The angle that instrument axis should make wit
9. SD18 22K HD 2003 83 HD 2003 83 1 LP SG LPG CP 18 5 CP 18 10 RS 48 levelling The sensor does not require any adjustment of its position during the year Equipped with anti condensation system 1W 12Vdc 8 pin M12 connector included 5 or 10 m standard cables with 8 pin M12 female connector are available upon request Available with heating option option R for installation in harsh climates for the removal of ice and snow Activation of heating below 6 C Power absorbed by heating 5W 12 Vdc Sensor for measuring sunshine duration referred to the 120 W m threshold of direct radiation according to WMO indications This sensor has no moving parts SDI 12 output and volt free contact output CLOSED radiation above the threshold OPEN radiation below the threshold Power supply 7 30 Vdc It can be fixed on a mast option V with a suitable accessory or installed on an horizontal surface option O by using the optional mounting base Built in spirit level for levelling The sensor does not require any adjustment of its position during the year Equipped with anti condensation system 1W 12 Vdc 8 pin Mi2 connector included 5 or 10m standard cables with 8 pin M12 female connector are available upon request Available with heating option option R for installation in harsh climates for the removal of ice and snow Activation of heating below 6 C Power absorbed by heating 5W 12 Vdc Base for installation of the
10. US Coils Register Register E 2 Permanent storage of the heating activation temperature MODBUS Holding Registers Register Register number address Indicator of the correct interpretation of the last Modbus 16 bit integer command sent If 0 the command has been executed correctly If 1 command execution errors occurred Indicator of the correct permanent storage of heating 16 bit integer activation temperature If O the temperature has been stored correctly If 1 storage errors occurred Temperature in C x10 below which the heating turns 16 bit integer on Check of the correct interpretation of the MODBUS commands To check if the last MODBUS command sent to the instrument has been interpreted correctly verify that the Holding Register number 1 address 0 contains the value 0 by using the 03h function code Read Holding Registers Connection of the instrument ae Other RS485 sensors 5VdcO PLC datalogger or Termination moo Termination RS485 USB or RS485 RS232 T a 4 fason converter for PC Lmax 1200m T ee L p en E lB nny OOK 4 DOOODOD Ae OOOX J Z F N T j E E a ial E cnND o CP18 cable Da Power Supply i Power suppl 7 30 Vdc a Power suppl Shield Hes Fig 11 RS485 connection 11 8 SDI 12 Communication The LP SD18 3x is equipped with an SDI 12 communication interface compliant with the version 1 3 of the protocol which all
11. ater if not enough use pure ethyl alcohol After cleaning with alcohol it is necessary to wash the surface with water and dry thoroughly In order to avoid the formation of condensation a heating element is present inside the instrument 1W 12 Vdc when connected moreover a special cartridge with desiccant material is included that prevents the condensation also in the case where it is not possible to use the heating for example to reduce consumption The efficiency of Silica gel decreases over time due to moisture absorption When crystals of silica gel are efficient their colour is yellow when gradually losing their efficiency the colour turns blue The user manual of the instrument describes the procedure for replacing them Typically the duration of the silica gel varies from 2 to 6 months depending on the environmental conditions in which the sunshine duration sensor is working 10 Ordering codes HEATING Blank no heating R with heating LP SD18 INSTALLATION B basic version O version for installation on the horizontal base V version for installation on a vertical mast OUTPUT 1 RS485 Modbus RTU output and volt free contact output 2 RS485 Modbus RTU output 0 1 Vdc voltage analog output and 0 1 V voltage digital output 3 SDI 12 output and volt free contact output LP SD18 1 Sensor for measuring sunshine duration referred to the 120 W m threshold of direct radiation according to WMO i
12. ber of seconds necessary for the instrument internal temperature and the to make the measures available 3 characters heating status n number of detected variables 1 character Note ttt 000 means that data are immediately available a nn d n lt CR gt lt LF gt Reads the internal temperature with nn d internal temperature in C and the heating status n 0 when heating OFF n 1 when heating ON gt Example of response 0 15 3 0 the instrument with address 0 measures 15 3 C of internal heating and the heater is switched off E ie e TYPE C COMMANDS START CONCURRENT MEASUREMENT Insulation status atttn lt CR gt lt LF gt with ttt number of seconds necessary for the instrument to make the measure available 3 characters n number of detected variables 1 character Note ttt 000 means that datum is immediately available a x lt CR gt lt LF gt Reads the status of insolation with x 0 if SRD lt 120 W m x 1 if SRD 120 W m presence or absence of sun Direct solar radiation atttn lt CR gt lt LF gt Request for performing the with ttt number of seconds necessary for the instrument Measurement of direct solar to make the measure available 3 characters radiation SRD in W m n number of detected variables 1 character Note ttt 000 means that datum is immediately available Request of detection of the insolation status presence or absence of sun atrrr
13. ead the RS485 address Baud Rate Read RS485 Baud Rate 0 gt 9600 1 19200 RMP Tx Mode Read RS485 transmission mode 0 gt 8 N 1 1 gt 8 N 2 2 gt 8 E 1 3 gt 8 E 2 4 gt 8 0 1 5 gt 8 0 2 RMW Rx Mode Read reception mode after RS485 transmission n 0 gt Violate protocol and go in Rx mode right after Tx n 1 gt Respect protocol and wait for 3 5 characters after Tx OPERATING MODE The instrument enters RS485 MODBUS RTU mode after 5 seconds from power on In the first 5 seconds from power on the instrument does not reply to requests from the MODBUS master unit After 5 seconds it is possible to send MODBUS requests to the instrument Reading of the measures and status of the instrument The measured values and the status of the instrument can be read in MODBUS mode by using the 04h function code Read Input Registers The following table lists the MODBUS Input Registers available MODBUS Input Registers some Som tm number address o Internal temperature C pao 16 bit integer as 2 3 2 Direct radiation SRD Direct Sunshine in W m 16 bit integer A Status register 16 bit integer BitO 1 error in the measure of radiation Bitl 1 gt error in the measure of temperature Bit2 1 gt data memory error Bit3 1 gt program memory error 1 3 5 4 Number of seconds in the last minute with radiation 16 bit integer higher than 120 W m number between 0 and 60 5 Number of tens of seconds in the last 1
14. h respect to the ground is equal to the latitude of the installation site this way the axis of the instrument will be parallel to the earth axis North South Fig 8 Fig 8 Sunshine Duration Sensor parallel to the Earth axis 6 Electrical Connections All the versions of the Sunshine Duration Sensor are equipped with an 8 pin M12 connector Upon request cables with 8 pin M12 female connector with 5 or 10 m standard length are available other lengths available upon request Cable CP18 i 5 Numbering g on the wires 5 9 ofthe cable 10 11 Instrument 12 M12 male Connector Fig 9 Connections LP SD18 1 and LP SD18 1R a B Numbering Numbering petting OO 8 a 9 Oo 5 Oo RABBE O O5 6 Voltfree contact output O Z 8 2 8 Voltfree contact output H O LP SD18 2 and LP SD18 2R Connector 12 pin cable Numbering Numbering 1 Power supply negative 0 1V analog output negative O 1V digital output negative p 2 Power supply positive 1 2 po eating pK RSA A po RS ABS BB p 6 OIV digital output positive 8 amp 8 Z po eating O10 8 AV analog output positive 1t o 12 1 3 5 10 11 LP SD18 3 and LP SD18 3R 12 pin cable Numbering Power supply negative Power supply positive j NC j SDI 12 Volt free contact output Volt free contact output C9 The connection of the heating is not polarized the two wires can be reversed 12 1
15. ilable 3 characters radiation SRD in W m n number of detected variables 1 character Note ttt 000 means that datum is immediately available atrrrr lt CR gt lt LF gt Reads the measurement of ee RD j with rrrr SRD with resolution 1 W m ee Ue Gea Cane eda Example of response 0 0135 The instrument with address 0 measures SRD 135 W m State and duration of sunshine atttn lt CR gt lt LF gt Request for detecting status with ttt number of seconds necessary for the instrument and lasting of insolation to make the measures available 3 characters n number of detected variables 1 character Note ttt 000 means that data are immediately available a x mm dd nnnnn lt CR gt lt LF gt Reads status and lasting of with isolation x 0 if SRD lt 120 W m x 1 if SRD 120 W m mm number of seconds in the last minute with x 1 dd number of tens of seconds in the last 10 minutes with x 1 dd 0 60 for each interval of 10 s a 1 is added if x 1 for at least 5 s nnnnn circular counter of the measuring cycles number gt Example of response 0 1 25 12 00048 The instrument with address 0 measures x 1 in the last minute there have been 25 s with x 1 in the last 10 min there have been from 60 to 120 s with x 1 48 measuring cycles have elapsed since the counter reset Internal temperature and heating status atttn lt CR gt lt LF gt Request of detecting the with ttt num
16. ndications This sensor has no moving parts RS485 MODBUS RTU output and volt free contact output CLOSED radiation above the threshold OPEN radiation below the threshold Power supply 7 30 Vdc It can be fixed on a mast option V with a suitable accessory or installed on an horizontal surface option O by using the optional mounting base Built in spirit level for levelling The sensor does not require any adjustment of its position during the year Equipped with anti condensation system LW 12 Vdc 8 pin M12 connector included 5 or 10 m standard cables with 8 pin M12 female connector are available upon request Available with heating option option R for installation in harsh climates for the removal of ice and snow Activation of heating below 6 C Power absorbed by heating 5W 12 Vdc LP SD18 2 Sensor for measuring sunshine duration referred to the 120 W m threshold of direct radiation according to WMO indications This sensor has no moving parts RS485 MODBUS RTU output 0 1 Vdc voltage analog output corresponding to 0 2000 W m of direct radiation voltage digital output 1V radiation above the threshold OV radiation below the threshold Power supply 7 30 Vdc It can be fixed on a mast option V with a suitable accessory or installed on an horizontal Surface option O by using the optional mounting base Built in spirit level for 16 LP SD18 3 ACCESSORIES LP SD18 0 LP SD18 V LP SD18 19K LP
17. nt separately powered and galvanically isolated which prevents the formation of condensation on the glass surface onto which the sensitive elements are placed For harsh climates the above mentioned versions are available with a second heating element option R LP SD18 xR which prevents the formation of ice and prevents snow from settling The instrument does not need any positioning adjustment during the year and it can be installed on a mast or on a proper fixing base optional The application fields are multiple from the agronomy agricultural science to the study the growth of crops to photovoltaic systems for verifying their performance to building automations for automatic opening closing of blinds shutters and in general to all those areas where it is necessary to monitor the presence of sunlight 2 Operating Principle The Sunshine Duration LPSD18 is based on the use of 16 sensors arranged in such a way that in the presence of sun at least one of the photo detectors is exposed to sun light directly from the sun besides the diffusion component Those sensors which are not directly illuminated by the sun are used for the measurement of the diffused light that is subtracted from the measurement of the sensor which sees the sun directly to get direct radiation j The cylindrical glass protects the sensors and the internal circuits of the instrument from the weather and at the same time provides an excellent transparency t
18. number to which the Sunshine Duration Sensor is connecting 3 Supply the Sunshine Duration Sensor and wait for the character amp to be displayed then send the command within 5 seconds from the power of the sensor and press the enter key Note if the Sunshine Duration Sensor does not receive the command within 5 seconds since when is powered the RS485 MODBUS mode is automatically activated In this case it is necessary to power the instrument off and then on again 4 Send the command CAL USER ON Note the command CAL USER ON turns off after 5 minutes of inactivity 5 In order to set the RS485 MODBUS parameters send the serial commands reported in the following table Command Response Description R amp I Set the address RS485 at nnn Set the address RS485 at nnn 1 247 Presettol 247 Preset to 1 a ecw Baud Rate RS485 n 0 9600 n 1 gt 19200 Preset to 1 19200 nll Set the RS485 transmission mode n 0 gt 8N1 n 1 gt 8N2 n 2 gt 8E1 n 3 gt 8E2 n 4 gt 801 n 5 gt 802 Preset to 2 gt 8 E 1 Note N no parity E even parity O odd parity CMWn Set the receiving mode after the RS485 transmission n 0 Violate protocol and go in Rx mode right after Tx n 1 Respect protocol and wait for 3 5 characters after Tx Preset to 1 Respect the protocol 6 It is possible to check the parameter settings by sending the following commands Command Response Description SS R
19. o sunlight In order to avoid the formation of condensation inside the instrument in addition to the heating element the LPSD18 is supplied with a cartridge that must be loaded with desiccant material in colloidal silica Silica gel 3 Technical specifications Sensitive elements 16 Silicon photodiodes Spectral range 360 1100 nm Direct radiation SRD measuring range 0 2000 W m Accuracy of the measurement of direct Better than 90 on the monthly total radiation Accuracy of the measurement of the Better than 90 on the monthly total sunshine duration sensor Threshold value 120 W m Power supply 7 30 Vdc Consumption 5mMA 12V Heating system 12 15 Vdc Anti condensation device consumption 1W 12V Antifreeze device consumption 5W 12V ON for internal Temp lt 6 C OFF for internal Temp gt 10 C Internal temperature Measuring range 40 80 C Accuracy ROUSE Operating temperature 40 80 C Protection degree IP66 Outputs LP SD18 1 RS485 MODBUS RTU Galvanically isolated contact closed SRD 120 W m open SRD lt 120 W m LP SD18 2 RS485 MODBUS RTU Analog output 0 1V 0 2000 W m Digital output 0 1V 1V SRD gt 120 W m OV SRD lt 120 W m LP SD18 3 SDI 12 Galvanically isolated contact closed SRD 120 W m open SRD lt 120 W m 4 Preparation of the sunshine duration sensor Before installing the instrument refill the cartridge containing silica gel desiccant
20. ows the connection to SDI 12 sensor networks The communication parameters of the PC or of the data logger should be set as follows baud rate 1200 data bits 7 parity Even stop bits 1 The communication with the instrument is performed by generating a Break signal on the serial line for at least 12 ms and then by sending a command in the following form lt Address gt lt Command gt with lt Address gt address of the instrument the command is sent to lt Command gt type of operation requested to the instrument The instrument reply is as follows lt Address gt lt Data gt lt CR gt lt LF gt with lt Address gt address of the instrument which replies lt Data gt information sent by the instrument lt CR gt ASCII character Carriage Return lt LF gt ASCII character Line Feed The LPSD18 3x comes with a factory address preset to 0 The address can be modified by using the proper SDI 12 command reported in the following table The following table reports the SDI 12 commands available To comply with the SDI 12 standard the instrument address is indicated in the table with the letter a SDI 12 Commands a lt CR gt lt LF gt Verifies the presence of the instrument allccccccccmmmmmmvvvssssssss lt CR gt lt LF gt Requests for information from with the instrument a address of the instrument 1 character Il SDI 12 compliant version 2 characters cccccccc manufacturer 8 characters mmmmmm instr
21. r lt CR gt lt LF gt Reads the measure of the with rrrr SRD with resolution 1 W m ee solar radiation SRD in m Status and lasting of insolation atttn lt CR gt lt LF gt Request for detecting status with ttt number of seconds necessary for the instrument and lasting of insolation to make the measures available 3 characters n number of detected variables 1 character Note ttt 000 means that data are immediately available a x mm dd nnnnn lt CR gt lt LF gt Reads status and lasting of with insolation x 0 if SRD lt 120 W m x 1 if SRD 120 W m mm number of seconds in the last minute with x 1 dd number of tens of seconds in the last 10 minutes with x 1 dd 0 60 for each interval of 10s a1 is added if x 1 for at least 5 s nnnnn circular counter of the measuring cycles number Internal temperature and heating status atttn lt CR gt lt LF gt Request of detecting the with ttt number of seconds necessary for the instrument internal temperature and the to make the measures available 3 characters heating status n number of detected variables 1 character Note ttt 000 means that data are immediately available a nn d n lt CR gt lt LF gt Reads the internal temperature with nn d internal temperature in C and the heating status n 0 when heating OFF n 1 when heating ON 14 TYPE R COMMAND CONTINUOUS MEASUREMENTS a x lt CR gt lt LF gt Reads the s
22. tatus of insolation with x 0 if SRD lt 120 W m x 1 if SRD 120 W m presence of absence of sun atrrrr lt CR gt lt LF gt Reads the measure of the with rrrr SRD with resolution 1 W m o solar radiation SRD in m a nn d n lt CR gt lt LF gt Reads internal temperature with nn d internal temperature in C and status of heating n 0 when heating OFF n 1 when heating ON a x mm dd nnnnn lt CR gt lt LF gt Reads status and lasting of with insolation x 0 if SRD lt 120 W m x 1 if SRD 120 W m mm number of seconds in the last minute with x 1 dd number of tens of seconds in the last 10 minutes with x 1 dd 0 60 for each interval of 10 s a 1 is added if x 1 for at least 5 s nnnnn circular counter of the measuring cycles number In addition to the above mentioned commands LPSD18 3x also implements the corresponding commands with CRC that require to add a 3 character CRC code at the end of the reply before lt CR gt lt LF gt The format of these commands is obtained from the previous by adding the letter C aMC aMC1 aMC2 aMC3 aCC aCC1 aCC2 aCC3 aRCO aRC1 aRC2 aRC3 For more information about the protocol visit the website Wwww sdi 12 org 15 9 Maintenance In order to ensure the declared high accuracy of the measures it is necessary that the protective glass is kept clean Cleaning can be performed with optical microfiber cloths for camera lenses and with some w
23. ument model 6 characters vvv firmware version 3 characters SSSSSSSS serial number 8 characters gt Example of response 013DeltaOhmLPSD1810013201518 with 0 instrument address 13 SDI 12 version 1 3 compliant DeltaOhm manufacturer s name LPSD18 instrument model 100 firmware version 1 0 0 13201518 serial number b lt CR gt lt LF gt Modification of the instrument Note if the b character is not an acceptable address the aoe instrument responds with a instead of b address a lt CR gt lt LF gt Request of the address of the instrument If more than one sensor is connected to the bus a conflict occurs 12 TYPE M COMMANDS START MEASUREMENT Insolation status atttn lt CR gt lt LF gt Request of detection of the with ttt number of seconds necessary for the instrument insolation status presence or to make the measure available 3 characters absence of sun n number of detected variables 1 character Note ttt 000 means that datum is immediately available a x lt CR gt lt LF gt Reads the status of insolation with x 0 if SRD lt 120 W m x 1 if SRD 120 W m presence or absence of sun Example of response 0 0 The instrument with address 0 measures SRD lt 120 W m Direct Solar Radiation atttn lt CR gt lt LF gt Request for performing the with ttt number of seconds necessary for the instrument Measurement of direct solar to make the measure ava
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