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Appendix A ______________________________________________________________ Networking

VAISALA______________________________________________________________________ 125

$WIXDR,C,25.8,C,2,U,10.7,N,0,U,10.9,V,1,U,3.360,V,2*7D<cr><lf>

For the transducer IDs, see

NMEA 0183 V3.0 Protocol on page 82

.

The maximum transducer ID is three when WMT52 address is 0.
Hence, assigning address 4 for the second and address 8 for the third
WMT52 on the bus the following responses to the XDR-query

$--

WIQ,XDR*2D<cr><lf>

will be obtained from these sensors (same

message parameter configuration):

The second sensor (address 4):

$WIXDR,A,330,D,4,A,331,D,5,A,333,D,6,S,0.1,M,4,S,0.1,M,5,S,0.2,
M,6*55<cr><lf>

$WIXDR,C,23.5,C,4,C,24.3,C,4,H,49.3,P,4,P,1010.1,H,
3*59<cr><lf>

$WIXDR,V,0.000,I,4,Z,0,s,4,R,0.00,I,4,V,0.0,M,5,Z,0,s,5,R,0.0,M,
5*67<cr><lf>

$WIXDR,C,25.8,C,6,U,10.6,N,4,U,10.9,V,5,U,3.362,V,6*78<cr><lf>

The third sensor (address 8):

$WIXDR,A,341,D,8,A,347,D,9,A,357,D,10,S,0.1,M,8,S,0.2,M,9,S,0.2,
M,10*53<cr><lf>

$WIXDR,C,23.5,C,8,C,24.3,C,9,H,49.3,P,8,P,1010.1,H,
8*5F<cr><lf>

$WIXDR,V,0.000,I,8,Z,0,s,8,R,0.00,I,8,V,0.0,M,9,Z,0,s,9,R,0.0,M,
9*61<cr><lf>

$WIXDR,C,25.8,C,10,U,10.6,N,8,U,10.9,V,9,U,3.360,V,
10*7C<cr><lf>

Now the response messages of all three sensors can be recognized and
parsed by the data logger.

NOTE

WMT52 address may consist of letter characters but the transducer IDs
in the NMEA XDR messages can only be numbers. The addresses
given in letters will show in the transducer IDs in the following way:
WMT52 address = A => transducer ID = 10, B => 11, a => 36, b =>
37 etc.

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Содержание WINDCAP WMT52

Страница 1: ...USER S GUIDE Vaisala WINDCAP Ultrasonic Wind Sensor WMT52 M210925EN B ...

Страница 2: ...ut prior written permission of the copyright holder The contents are subject to change without prior notice Please observe that this manual does not create any legally binding obligations for Vaisala towards the customer or end user All legally binding commitments and agreements are included exclusively in the applicable supply contract or Conditions of Sale Vaisala Oyj Phone int 358 9 8949 1 P O ...

Страница 3: ...EW 15 Introduction to Ultrasonic Wind Sensor WMT52 15 Heating Function 16 Optional Software for Easy Settings 16 Ultrasonic Wind Sensor WMT52 Components 17 CHAPTER 3 FUNCTIONAL DESCRIPTION 23 Wind Measurement Principle 23 Heating Optional 25 CHAPTER 4 INSTALLATION 27 Unpacking Instructions 27 Selecting the Location 28 Installation Procedure 30 Mounting 30 Mounting to Vertical Pole Mast 30 Mounting...

Страница 4: ...ugh M12 Bottom Connector or Screw Terminal 55 Communication Setting Commands 56 Checking the Current Communication Settings aXU 56 Setting Fields 57 Changing the Communication Settings aXU 59 CHAPTER 7 GETTING THE DATA MESSAGES 61 General Commands 62 Reset aXZ 62 Measurement Reset aXZM 63 ASCII Protocol 64 Abbreviations and Units 64 Device Address 64 Acknowledge Active Command a 65 Wind Data Messa...

Страница 5: ...nt Query 85 TXT Text Transmission 91 Automatic Mode 92 Automatic Composite Data Message aR0 93 CHAPTER 8 SENSOR AND DATA MESSAGE SETTINGS 95 Wind Sensor 95 Checking the Settings aWU 95 Setting Fields 97 Changing the Settings aWU 99 Supervisor Message 101 Checking the Settings aSU 101 Setting Fields 102 Changing the Settings aSU 103 Composite Data Message aR0 104 CHAPTER 9 MAINTENANCE 107 Cleaning ...

Страница 6: ...Wiring 122 Communication Protocol 123 ASCII Polled 123 NMEA 0183 v3 0 Query 124 NMEA 0183 v3 0 Query with ASCII Query Commands 126 APPENDIX B SDI 12 PROTOCOL 129 SDI 12 Electrical Interface 129 SDI 12 Communications Protocol 130 SDI 12 Timing 131 APPENDIX C CRC 16 COMPUTATION 133 Encoding the CRC as ASCII Characters 134 NMEA 0183 v3 0 Checksum Computation 134 APPENDIX D WIND MEASUREMENT AVERAGING ...

Страница 7: ...crew 31 Figure 12 Mounting WMT52 to Pole Mast Using Optional Mounting Kit 32 Figure 13 Mounting WMT52 to Cross Arm 33 Figure 14 Mounting Bolt Location in Cross Arm 33 Figure 15 Grounding Using the Bushing and Grounding Kit 34 Figure 16 Grounding Jumper Location 35 Figure 17 Sketch of Magnetic Declination 36 Figure 18 Wind Direction Offset 37 Figure 19 Average Operational Current Consumption with 4...

Страница 8: ...________________________________________________________________________________ 6 _______________________________________________________________________________ ...

Страница 9: ...ult Serial Communication Settings for M12 Screw Terminal Connection 55 Table 6 Abbreviations and Units 64 Table 7 Transducer IDs of the Measurement Parameters 87 Table 8 Transducer Table 91 Table 9 Data Validation 109 Table 10 Communication Problems 110 Table 11 Error Messaging Text Messages Table 112 Table 12 Performance 115 Table 13 Inputs and Outputs 116 Table 14 Operating Conditions 116 Table ...

Страница 10: ...________________________________________________________________________________ 8 _______________________________________________________________________________ ...

Страница 11: ...ng chapters Chapter 1 General Information This chapter provides general notes for the product Chapter 2 Product Overview This chapter introduces the unique features and advantages of the Vaisala Ultrasonic Wind Sensor WMT52 Chapter 3 Functional Description This chapter describes the measurement principles and heating function of Ultrasonic Wind Sensor WMT52 Chapter 4 Installation This chapter prov...

Страница 12: ...uctions for the basic maintenance of Ultrasonic Wind Sensor WMT52 and contact information for Vaisala Service Centers Chapter 10 Troubleshooting This chapter describes common problems their probable causes and remedies and includes contact information for technical support Chapter 11 Technical Specifications This chapter provides the technical data of Ultrasonic Wind Sensor WMT52 General Safety Co...

Страница 13: ...ended use However it is possible to damage the product by delivering electrostatic discharges when touching removing or inserting any objects inside the equipment housing To make sure you are not delivering high static voltages yourself Handle ESD sensitive components on a properly grounded and protected ESD workbench When this is not possible ground yourself with a wrist strap and a resistive con...

Страница 14: ...lity of the WMT52 has been tested according to the following product family standard IEC 61326 1 Electrical equipment for measurement control and laboratory use EMC requirements for use in industrial locations Additionally the EMC specification and vibration tolerance of the WMT52 has been enhanced for marine use according to the following sections of the IEC 60945 Maritime Navigation and Radiocom...

Страница 15: ... part shall should Vaisala so require be sent to the works of Vaisala or to such other place as Vaisala may indicate in writing freight and insurance prepaid and properly packed and labelled unless Vaisala agrees to inspect and repair the Product or replace it on site This warranty does not however apply when the defect has been caused through a normal wear and tear or accident b misuse or other u...

Страница 16: ...User s Guide ______________________________________________________________________ 14 ___________________________________________________________________M210925EN B ...

Страница 17: ...______________________________________________________________________ 15 CHAPTER 2 PRODUCT OVERVIEW This chapter introduces the unique features and advantages of the Vaisala Ultrasonic Wind Sensor WMT52 Introduction to Ultrasonic Wind Sensor WMT52 0806 009 Figure 1 Ultrasonic Wind Sensor WMT52 ...

Страница 18: ...ons are available Heating function Service Pack 2 Windows based Vaisala Configuration Tool software with USB service cable 1 4m USB RS 232 RS 485 cable 1 4m Mounting kit Bird spike kit Surge protector Shielded cables 2m 10m 40m Bushing and grounding kit Heating Function To improve the accuracy of measurements an optional heating function is available More about heating in section Heating Optional ...

Страница 19: ...ew VAISALA_______________________________________________________________________ 17 Ultrasonic Wind Sensor WMT52 Components 0803 041 Figure 2 WMT52 Components The following numbers refer to Figure 2 on page 17 1 Top assembly 2 Silicon gasket 3 Spacers 4 Bottom assembly 5 Allen screws ...

Страница 20: ...0925EN B 0803 029 Figure 3 Bottom of the Sensor The following numbers refer to Figure 3 on page 18 1 Alignment direction sign 2 4 pin M8 connector for Service Port 3 Water tight cable gland optional included in the Bushing and Grounding Kit 4 Opening for cable gland if unused cover with a hexagonal plug 5 8 pin M12 connector for power datacom cable optional ...

Страница 21: ... mounting kit alignment is needed only when mounting for the first time Using the mounting kit also improves the IP classification of the WMT52 to IP66 Without the mounting kit the WMT52 is IP65 0804 022 Figure 5 USB Cables optional The service cable while connected between the service port and PC forces the service port to RS 232 19200 8 N 1 The following numbers refer to Figure 5 on page 19 1 US...

Страница 22: ...spikes pointing upward The kit is installed on top of the sensor and attached with a screw The shape and location of the spikes has been designed so that the interference with wind and rain measurement is minimal The spikes are designed not to hurt the birds they are simply a barrier to make it more difficult for birds to land on top of the sensor Note that the bird spike kit does not provide comp...

Страница 23: ...s The WSP150 should be installed close to the protected instrument max 3 m Vaisala Surge Protector WSP152 is designed to be used with Vaisala WXT transmitters and WMT sensors to protect the host PC against surges entering through the USB port The WSP152 should be installed close to the PC no further than the USB cable can reach 1 4 m Vaisala recommends using surge protectors when weather instrumen...

Страница 24: ...User s Guide ______________________________________________________________________ 22 ___________________________________________________________________M210925EN B ...

Страница 25: ...ensor has an array of three equally spaced ultrasonic transducers on a horizontal plane Wind speed and wind directions are determined by measuring the time it takes the ultrasound to travel from each transducer to the other two The wind sensor measures the transit time in both directions along the three paths established by the array of transducers This transit time depends on the wind speed along...

Страница 26: ...eed in selected units m s kt mph km h The wind direction is expressed in degrees The wind direction reported by WMT52 indicates the direction that the wind comes from North is represented as 0 east as 90 south as 180 and west as 270 The wind direction is not calculated when the wind speed drops below 0 05 m s In this case the last calculated direction output remains until the wind speed increases ...

Страница 27: ...ind direction variance is returned in the traditional way The WMT52 constantly monitors the wind measurement signal quality If poor quality is detected the wind values are marked as invalid If over half of the measurement values can be considered as invalid the last valid wind values are returned as missing data However in the SDI 12 protocol the invalid values will be marked as zeroes Heating Opt...

Страница 28: ...ows how heating behaves as Ta starts to fall When Ta falls below 10 C heating is enabled Heating keeps Th 4 C until Ta 11 C Between 11 65 C Th is approximately 15 C warmer than Ta When the heating function is disabled the heating is off in all conditions see Supervisor Message on page 101 NOTE Snow accumulation may cause a temporary wind measurement problem even when the heating is enabled ...

Страница 29: ...hat is intended to help you install Ultrasonic Wind Sensor WMT52 Unpacking Instructions Ultrasonic Wind Sensor WMT52 comes in a custom shipping container Be careful when removing the device from the container CAUTION Beware of damaging any of the wind transducers located at the top of the three antennas Dropping the device can break or damage the transducers If the antenna bends or twists the re a...

Страница 30: ...ent measurements The site should represent the general area of interest The WMT52 should be installed in a location that is free from turbulence caused by nearby objects such as trees and buildings In general any object of height h will not remarkably disturb wind measurement at a minimum distance of 10 h There should be at least 150 m open area in all directions from the mast Refer to Figure 9 on...

Страница 31: ...llations on top of high buildings or masts and in sites on open grounds are vulnerable to lightning strikes A nearby lightning strike may induce a high voltage surge not tolerable by the internal surge suppressors of the instrument Additional protection is needed in regions with frequent severe thunderstorms especially when long line cables 30m are used Vaisala recommends using a surge protectors ...

Страница 32: ...or onto a horizontal cross arm When mounting WMT52 onto a pole mast an optional mounting kit can be used to ease mounting When using the optional mounting kit alignment is needed only when mounted for the first time Each of the mounting options is further described in the following sections Mounting to Vertical Pole Mast 1 Remove the screw cover and insert the WMT52 to the pole mast 2 Align the se...

Страница 33: ...nting Kit 1 Insert the mounting kit adapter to the sensor bottom in the position shown in the picture 2 Turn the kit inside the bottom firmly until you feel that the adapter snaps into the locked position 3 Mount the adapter to the pole mast do not tighten the fixing screw provided 4 Align the sensor in such a way that the arrow points to north 5 Tighten the fixing screw ot the mounting adapter to...

Страница 34: ...direction see Aligning the WMT52 on page 36 In case the cross arm cannot be aligned make the wind direction offset as instructed in section Wind Direction Offset on page 37 3 Mount the sensor into the cross arm by using a mounting bolt M6 DIN933 and a nut see Figure 13 on page 33 and Figure 14 on page 33 The following numbers refer to Figure 12 on page 32 1 Fixing screw 2 Mounting kit NOTE When re...

Страница 35: ..._______________________________________________ 33 0803 044 Figure 13 Mounting WMT52 to Cross Arm 0803 042 Figure 14 Mounting Bolt Location in Cross Arm The following numbers refer to 1 Nut M6 DIN934 2 Mounting bolt M6 DIN933 The following numbers refer to Figure 14 on page 33 1 Nut M6 DIN934 2 Mounting Bolt M6 DIN933 ...

Страница 36: ...ng the Bushing and Grounding Kit and a cable to provide the ground connection Grounding using the Bushing and Grounding Kit If necessary you can run a cable from the fixing screw to a grounding point A Bushing and Grounding Kit Vaisala order code 222109 is available for this purpose The kit includes a longer fixing screw two nuts and washers and an Abiko connector for the grounding cable Refer to ...

Страница 37: ...will still be flowing thus helping the WMT52 survive transient overvoltages The jumper is located inside the sensor on the same component board as the screw terminals The location of the jumper is indicated in Figure 16 on page 35 0803 048 Figure 16 Grounding Jumper Location To remove the jumper you must open the sensor If you need to access the screw terminals you should remove the jumper at the ...

Страница 38: ...eferred either to true north which uses the earth s geographic meridians or to the magnetic north which is read with a magnetic compass The magnetic declination is the difference in degrees between the true north and magnetic north The source for the magnetic declination needs to be current as the declination changes over time 0003 011 Figure 17 Sketch of Magnetic Declination Compass Alignment To ...

Страница 39: ... case the WMT52 cannot be aligned in such a way that the arrow on the bottom points to the north In this case the deviation angle from the true north needs to be given to the WMT52 1 Mount the sensor to a desired position see section Mounting on page 30 2 Define the deviation angle from the north zero alignment Use the sign indication to express the direction from the north line see example pictur...

Страница 40: ...User s Guide ______________________________________________________________________ 38 ___________________________________________________________________M210925EN B ...

Страница 41: ...an be wired either through the internal screw terminal or the 8 pin M12 connector optional Only one serial interface can be used at a time Power Supplies Operating Voltage Operating voltage Vin 5 32 VDC Notice that for the average current consumption see the graphs in Figure 19 on page 40 The minimum consumption graph is for SDI 12 standby mode The input power supply needs to be capable to deliver...

Страница 42: ...ge Settings on page 95 The average current consumption will decrease almost in proportion to the sampling rate since wind measurement is the most consuming operation in the system In most occasions the average consumption is less than 10 mA Typically the higher the voltage the lower the current see Figure 19 on page 40 0805 023 Figure 19 Average Operational Current Consumption with 4Hz Wind Sensor...

Страница 43: ...cally changes the heating element combination in order to consume equal power with 12 VDC and 24 VDC supplies Input resistance Rin is radically increased with voltages above 16 V see the following graph The recommended ranges for AC or full wave rectified AC are 68 Vp p 20 max 0 6 A for AC 34 Vp 20 max 0 6 A for f w rectified AC 0805 22 Figure 20 Heating Current and Power vs Vh CAUTION To avoid ex...

Страница 44: ... Data in RxD and Data out TxD in the table describe the direction of data flow as seen from the WMT52 The terms Default wiring and RS 422 wiring refer to the two internal wiring options see the diagrams on the next page Table 1 Pin outs for WMT52 Serial Interfaces and Power Supplies Default wiring RS 422 wiring Wire Color M12 Pin RS 232 SDI 12 RS 485 RS 422 Blue 7 Data out TxD Data in out Tx Data ...

Страница 45: ...terface since the Rx and Tx lines are separate at the M12 connector Bidirectional use of the RS 485 and RS 422 interface requires a proper adapter module between the PC and the WMT52 For testing purposes the inverted output of either interface screw terminal pin 3 TX is directly readable with PC s Received Data line In this case Signal Ground for PC ComPort is taken from screw terminal pin 6 SGND ...

Страница 46: ... out the bottom part of the sensor 3 Insert the power supply wires and signal wires through the cable gland s in the bottom of the sensor Cable glands are included in the optional Bushing and Grounding Kit order code 222109 4 Connect the wires according to Table 2 on page 45 5 Replace the bottom part and tighten the three screws Do not overtighten 0803 035 Figure 23 Screw Terminal Block The follow...

Страница 47: ... Data in RxD Data in out Rx 6 SGND GND for data GND for data 17 HTG GND for Vh GND for Vh GND for Vh GND for Vh 18 HTG Vh heating Vh heating Vh heating Vh heating 19 VIN GND for Vin GND for Vin GND for Vin GND for Vin 20 VIN Vin operating Vin operating Vin operating Vin operating NOTE In the true SDI 12 mode the two Data in out lines must be combined either in the screw terminal or outside the WMT...

Страница 48: ...faces 0505 206 Figure 24 Data Communication Interfaces With RS 485 and RS 422 interfaces termination resistors need to be used at both ends of the line if data rate is 9600 Bd or higher and distance is 600 m 2000 ft or longer Resistor range 100 180 Ω is suitable for twisted pair lines Resistors are connected across RX to RX and across TX to TX with two wire RS 485 only one resistor needed ...

Страница 49: ...tion of the WMT52 varies depending on the selected operating mode or protocol the data interface type and the measurement and reporting intervals Lowest consumption is achieved with the Native SDI 12 mode typically about 1 mW in standby 0 1 mA 12 V while with ASCII RS 232 or Continuous SDI 12 modes it is about 3 mW in standby Some hints for economic power management are given below The current con...

Страница 50: ...onsumption during the message sending time Also it should be noted that the host device s input data logger or PC may constantly draw some current from the TX line RS 485 and RS 422 Data interfaces consume about the same as RS 232 But with long data cables the consumption during data transmission may be much higher especially when termination resistors are used On the other hand the RS 485 driver ...

Страница 51: ...and or while supplied through the Service port the WMT52 consumes 0 3 0 6 mA more than in normal mode when supplied through the Main port M12 connector or screw terminals When supplied through the Service port the minimum voltage level for reliable operation is 6V This can also be seen in the supply voltage reading of the Supervisor message the Vs value is 1V lower than the actual input voltage ...

Страница 52: ...User s Guide ______________________________________________________________________ 50 ___________________________________________________________________M210925EN B ...

Страница 53: ... chosen the communication protocol ASCII NMEA 0183 or SDI 12 when placing the order In case you want to check and or change the protocol or other communication settings see the following sections Table 3 Available Serial Communication Protocols Serial Interface Communication Protocols Available RS 232 ASCII automatic and polled NMEA 0183 v3 0 automatic and query SDI 12 v1 3 and SDI 12 v1 3 continu...

Страница 54: ... SDI 12 can be accessed with a standard PC terminal presuming that for SDI 12 the Data in out lines have not been combined inside WMT52 Table 4 Connection Cable Options Cable Name Connector on Sensor End Connector on User End Order Code USB Service Cable 1 4m M8 female USB type A 220614 also includes Vaisala Configuration Tool software USB Service Cable Adapter for WXT510 WMT50 WXT510 WMT50 servic...

Страница 55: ...on of the driver may take several minutes 4 After the driver has been installed connect the USB cable to a USB port on your PC Windows will detect the new device and use the driver automatically 5 The installation has reserved a COM port for the cable Verify the port number and the status of the cable using the Vaisala USB Instrument Finder program that has been installed in the Windows Start menu...

Страница 56: ...n the USB port of your PC and the M8 service port connector on the bottom plate of the sensor by using the USB service cable See Figure 3 on page 18 2 Open the Vaisala Configuration Tool or a terminal program 3 Select the COM port that has been reserved for the USB cable and select the following default communication settings 19200 8 N 1 4 Use the Vaisala Configuration Tool or a terminal program t...

Страница 57: ...screw terminal Then you have to have know the communication settings of the device have a suitable cable between the device and the host and if needed use a converter for example RS 485 422 to RS 232 if the host is a PC The factory defaults settings are as follows Table 5 Default Serial Communication Settings for M12 Screw Terminal Connection Serial Interface Serial Settings SDI 12 1200 baud 7 E 1...

Страница 58: ... D P P S S L L N N V V cr lf NOTE Hereafter the commands to be typed are presented in normal text while the responses of the sensor are presented in italic where a Device address which may consist of the following characters 0 default 9 A Z a z XU Device settings command in ASCII and NMEA 0183 XXU Device settings command in SDI 12 cr lf Command terminator in ASCII and NMEA 0183 Command terminator ...

Страница 59: ...ent T Test parameter for testing use only C Automatic repeat interval for the Composite Message 0 3600 s 0 no automatic repeat Does not work in SDI 12 modes I Serial interface 1 SDI 12 2 RS 232 3 RS 485 4 RS 422 B Baud rate 1200 2400 4800 9600 19200 38400 57600 115200 D Data bits 7 8 P Parity O Odd E Even N None S Stop bits 1 2 L RS 485 line delay 0 10000 ms Defines the delay between the last char...

Страница 60: ...0XXU 0XXU A 0 M S T 0 C 1 B 1200 D 7 P E S 1 L 25 N WMT50 V 1 00 cr lf NOTE There are two different SDI 12 modes available for providing all the functionality of the SDI 12 v1 3 standard The lowest power consumption is achieved with the Native SDI 12 mode aXU M S as it makes measurements and outputs data only on request In the continuous SDI 12 mode aXU M R internal measurements are made at a user...

Страница 61: ...ields see Setting Fields on page 57 x Input value for the setting cr lf Command terminator in ASCII and NMEA 0183 Command terminator in SDI 12 NOTE When changing the serial interface and communication protocol note the following Each serial interface requires its specific wiring and or jumper settings described in Chapter 5 Wiring and Power Management on page 39 Change first the serial interface f...

Страница 62: ...unication protocol and baud settings 19200 8 N 1 to RS 485 serial interface with ASCII automatic protocol and baud settings 9600 8 N 1 Checking the actual settings 0XU cr lf 0XU A 0 M P C 2 B 19200 D 8 P N S 1 L 25 N WMT50 V 1 00 cr lf Changing several settings with one command 0XU M A C 3 B 9600 cr lf 0XU M A C 3 B 9600 cr lf Checking the changed settings 0XU cr lf 0XU A 0 M A T 1 C 3 B 9600 D 8 ...

Страница 63: ...ds For changing the message parameters units and other settings see Chapter 8 Sensor and Data Message Settings on page 95 NOTE Type commands in CAPITAL letters NOTE The parameter order in messages is as follows Wind M1 Dn Dm Dx Sn Sm Sx Supv M5 Th Vh Vs Vr Id Comp M Wind Supv parameters in above order The parameters are in the same order as in the Setting Field tables in chapter Sensor and Data Me...

Страница 64: ...al commands given in ASCII and NMEA formats Reset aXZ This command is used to perform software reset on the device Command format in ASCII and NMEA 0183 aXZ cr lf Command format in SDI 12 aXZ The response depends on the communication protocol see the examples Example ASCII 0XZ cr lf 0TX Start up cr lf Example SDI 12 0XZ 0 cr lf device address Example NMEA 0183 0XZ cr lf WITXT 01 01 07 Start up 29 ...

Страница 65: ...oing measurements of the sensor and start them from the beginning Command format in ASCII and NMEA 0183 aXZM cr lf Command format in SDI 12 aXZM Example ASCII 0XZM cr lf 0TX Measurement reset cr lf Example SDI 12 0XZM 0 device address Example NMEA 0183 0XZM cr lf WITXT 01 01 09 Measurement reset 50 cr lf where a Device address XZM Measurement break command cr lf Command terminator in ASCII and NME...

Страница 66: ...h knots M K S N Sm Wind speed average m s km h mph knots M K S N Sx Wind speed maximum m s km h mph knots M K S N Dn Wind direction minimum deg D Dm Wind direction average deg D Dx Wind direction maximum deg D Th Heating temperature C F C F Vh Heating voltage V N V W F2 2 For heating heating option is not available has not been ordered N heating option is available but have been disabled by user o...

Страница 67: ...If you need to change the device address see Changing the Communication Settings aXU on page 59 Acknowledge Active Command a This command is used to ensure that a device is responding to a data recorder or another device It asks a device to acknowledge its presence on the bus Command format a cr lf The response a cr lf Example 0 cr lf 0 cr lf where b Device address default 0 cr lf Response termina...

Страница 68: ... Dn 236D Dm 283D Dx 031D Sn 0 0M Sm 1 0M Sx 2 2M cr lf To change the parameters and units in the response message and to make other sensor settings see section Wind Sensor on page 95 where a Device address R1 Wind message query command cr lf Command terminator where a Device address R1 Wind message query command Dn Wind direction minimum D degrees Dm Wind direction average D degrees Dx Wind direct...

Страница 69: ...he response message and to make other settings see section Supervisor Message on page 101 The content of the parameter Id is a text string which can be modified by using the Vaisala Configuration Tool only Field can include customer specific additional information For more information on changing the settings refer to the Vaisala Configuration Tool on line help for the Info field in the Device Set...

Страница 70: ...Composite Data Message Query aR0 This command is used to request a combined data message with user configurable set of wind and supervisor data Command format aR0 cr lf Example of the response the parameters included can be chosen from the full parameter set of the commands aR1 and aR5 0R0 Dx 005D Sx 2 8M Th 23 6C cr lf For selecting the parameter set in the response message see Chapter 8 Sensor a...

Страница 71: ...33 Requesting a wind data message with a CRC Command format ar1xxx cr lf Example of the response the parameter set is configurable 0r1 Dn 236D Dm 283D Dx 031D Sn 0 0M Sm 1 0M Sx 2 2MLFj cr lf where the three characters before cr lf are the CRC for the response Example of asking the CRC for the wind data message query ar1 Command format ar1yyy cr lf where a Device address r1 Wind message query comm...

Страница 72: ...essage Settings on page 95 Automatic Mode When automatic ASCII protocol is selected the sensor sends data messages at user configurable update intervals The message structure is same as with data query commands aR1 and aR5 You can choose an individual update interval for each sensor see Chapter 8 Sensor and Data Message Settings on page 95 sections Changing the Settings Example 0R1 Dm 027D Sm 0 1M...

Страница 73: ...ting the parameter set in the response message see Chapter 8 Sensor and Data Message Settings on page 95 Automatic composite data messaging is a concurrent not an alternate mode to either the polled or automatic modes SDI 12 Protocol There are two different SDI 12 modes available for providing all the functionality of the SDI 12 v1 3 standard The lowest power consumption is achieved with the Nativ...

Страница 74: ...y the host device Especially the wind measurement typically consumes 60 mW average power with 4 Hz sampling rate throughout the averaging period In the Continuous mode aXU M R the power consumption is determined by the internal update intervals of the sensor and wind averaging time These have certain limits so very long measurement intervals cannot be achieved in this mode Also the power consumpti...

Страница 75: ...presence on the SDI 12 bus Command format a The response a cr lf Example 0 0 cr lf Change Address Command aAb This command changes the device address After the command has been issued and responded to the sensor is not required to respond to another command for one second time in order to ensure writing the new address to the non volatile memory Command format aAb where a Device address Command te...

Страница 76: ...format aI The response a13ccccccccmmmmmmvvvxxxxxxxx cr lf where b Device address the new address or the original address if the device is unable to change it cr lf Response terminator where a Device address I Send identification command Command terminator where a Device address 13 The SDI 12 version number indicating SDI 12 version compatibility for example version 1 3 is encoded as 13 cccccccc 8 ...

Страница 77: ... to the same bus and simultaneous measurements from the different devices are needed Start concurrent measurement aC or Start concurrent measurement with CRC aCC should be used see the next sections See Examples of aM aC and aD Commands on page 79 Command format aMx The response is sent in two parts The response part one atttn cr lf The response part two indicates that the data is ready to be requ...

Страница 78: ...s measurements are needed from the devices or if more than nine 9 measurement parameters are requested from a single device ttt The measurement completing time in seconds n The number of the measured parameters available maximum number is 9 cr lf Response terminator NOTE For changing the message parameters units and other settings see Chapter 8 Sensor and Data Message Settings on page 95 NOTE When...

Страница 79: ...RC aCC Command format aCCx where a Device address C Start concurrent measurement command x The desired measurement 1 Wind 5 Supervisor If x is left out the query refers to combined data message in which the user can request data from several sensors with just one command See the examples below Command terminator where a Device address ttt The measurement completing time in seconds nn The number of...

Страница 80: ...ommand tells the number of parameters available However the number of the parameters that can be included in a single message depends on the number of characters in the data fields If all the parameters are not retrieved in a single response message repeat the Send data commands until all the data is obtained where a Device address D Send data command x The order of consecutive Send data commands ...

Страница 81: ...gress started with commands aM aMC aC or aCC NOTE In SDI 12 v1 3 Continuous measurement mode aXU M R the sensor makes measurements at configurable update intervals The aD command following the aM aMC aC or aCC command always returns the latest updated data Thus in aXU M R mode issuing consecutive aD commands may result in different data strings if the value s happen to be updated between the comma...

Страница 82: ...phase request procedure of commands aM aMC aC aCC aD In this case the obtained parameter values are those from the latest internal updating for setting of update intervals see Chapter 8 Sensor and Data Message Settings on page 95 Command format aRx The response NOTE For using Continuous measurement commands for wind and supervisor parameters the respective protocol must be selected aXU M R The M S...

Страница 83: ...nction as the Continuous measurement command aR but a three character CRC is added to the response data strings before cr lf Example device address 0 0RC3 0 0 04 10 14 8 0 0 0 0 0INy Start Verification Command aV This command is used to query self diagnostic data from the device However the command is not implemented in WMT52 The self diagnostic data can be requested with aM5 command where a Devic...

Страница 84: ...ttings on page 95 A two character checksum CRC field is transmitted in all data request sentences For definition of the CRC see Appendix C CRC 16 Computation on page 133 Device Address This command is used to query the address of the device on the bus Command format cr lf The response b cr lf Example cr lf 0 cr lf If more than one sensor is connected to the bus see Appendix A Networking on page 12...

Страница 85: ... lf The response a cr lf Example 0 cr lf 0 cr lf MWV Wind Speed and Direction Query Request the wind speed and direction data with a MWV query command For using MWV query the NMEA Wind formatter parameter in the wind sensor settings shall be set to W see section Wind Sensor on page 95 With MWV query only wind speed and direction average values can be requested For obtaining min and max data for sp...

Страница 86: ...pe identifier WI weather instrument Q Defines the message as Query MWV Wind speed and direction query command Checksum delimiter hh Two character checksum for the query command cr lf Command terminator where Start of the message WI Talker identifier WI weather instrument MWV Wind speed and direction response identifier x x Wind direction value1 1 Wind direction is given in relation to the devices ...

Страница 87: ...ucer Measurement Query XDR query command outputs the data of all other sensors except wind When requesting also wind data with the XDR command the NMEA Wind formatter parameter in the wind sensor settings shall be set to T see section Wind Sensor on page 95 Command format WIQ XDR hh cr lf The response includes the parameters activated in the data messages see Chapter 8 Sensor and Data Message Sett...

Страница 88: ...er type for the first transducer see the following transducer table x x1 Measurement data from the first transducer u1 Units of the first transducer measurement see the following transducer table c c1 First transducer identification id WMT52 s address aXU A is added as a base number to the transducer id For changing the address see Checking the Current Communication Settings aXU on page 56 command...

Страница 89: ... wind speed are measurements of the same parameter wind speed so if all three are configured to be shown in the XDR message they get transducer ids A A 1 and A 2 respectively where A is WMT52 address aXU A The same applies for the wind direction For example for a WMT52 with device address 0 the transducer ids of all the measurement parameters are as follows Example of the XDR Query all parameters ...

Страница 90: ...______________ 88 ___________________________________________________________________M210925EN B Wind sensor data WIXDR A 302 D 0 A 320 D 1 A 330 D 2 S 0 1 M 0 S 0 2 M 1 S 0 2 M 2 57 cr lf Supervisor data WIXDR C 20 4 C 2 U 12 0 N 0 U 12 5 V 1 U 3 460 V 2 G HEL ___ 4 2D ...

Страница 91: ...D Transducer id 1 units degrees average wind direction 1 Transducer id for average wind direction A Transducer id 2 type wind direction 330 Transducer id 2 data max wind direction D Transducer id 2 units degrees max wind direction 2 Transducer id for max wind direction S Transducer id 0 type wind speed 0 1 Transducer id 0 data min wind speed M Transducer id 0 units m s min wind speed 0 Transducer ...

Страница 92: ...ing voltage M Transducer id 0 units N heating disabled or heating temperature too high1 Heating voltage 1 See Chapter 8 section Supervisor Message Setting Fields for definitions of the Heating voltage field 0 Transducer id for Heating voltage U Transducer id 1 type Supply voltage 12 5 Transducer id 1 data Supply voltage V Transducer id 1 units V Supply voltage 1 Transducer id for Supply voltage U ...

Страница 93: ...hrenheit Angular displacement wind direction A D degrees Wind speed S K km h M m s N knots S mph non standardized1 Voltage U V volts also 50 duty cycle for heating N not in use F 50 duty cycle for heating W full power for heating Generic G None null P percent 1 Not specified in the NMEA 0183 Standard where Start of the message WI Talker identifier WI weather instrument TXT Text transmission identi...

Страница 94: ...MWV query command Automatic Mode When NMEA 0183 v3 0 automatic protocol is selected the sensor sends data messages at user configurable update intervals The message format is the same as in the MWV and XDR data queries The NMEA wind formatter parameter in the wind sensor settings determines whether the wind messages are sent in MWV or XDR format You can use ASCII data query commands aR1 aR5 aR aR0...

Страница 95: ...r configurable set of wind and supervisor data Example the parameters included can be chosen from the full parameter set of the commands aR1 and aR5 WIXDR A 322 D 0 A 036 D 1 A 084 D 2 S 0 2 M 0 S 0 4 M 1 S 0 9 M 2 C 21 0 C 2 U 12 0 N 0 U 12 5 V 1 U 3 514 V 2 G Vaisala 4 4D cr lf Example only wind direction speed averages and heating temperature included WIXDR A 037 D 1 S 0 3 M 1 C 21 2 C 2 7F cr ...

Страница 96: ...User s Guide ______________________________________________________________________ 94 ___________________________________________________________________M210925EN B ...

Страница 97: ... configuration and data message formatting commands for all communications protocols ASCII NMEA 0183 and SDI 12 Sensor and data message settings can also be done by using the Vaisala Configuration Tool software With this software tool you can change the device and sensor settings easily in Windows environment See Table 18 on page 118 Wind Sensor Checking the Settings aWU With the following command...

Страница 98: ...e in SDI 12 aXWU R R I I A A G G U U D D N N F F cr lf where R I A G U D N are the setting fields see the following sections Example ASCII and NMEA 0183 device address 0 0WU cr lf 0WU R 01001000 00100100 I 60 A 10 G 1 U N D 90 N W F 4 cr lf Example SDI 12 device address 0 0XWU 0XWU R 11111100 01001000 I 10 A 3 G 1 U M D 0 N W F 4 cr lf where a Device address WU Wind sensor settings command in ASCI...

Страница 99: ...t Dx Direction maximum 4th bit Sn Speed minimum 5th bit Sm Speed average 6th bit Sx Speed maximum 7th bit spare 8th bit spare delimiter The bits 9 16 determine the wind parameters in the composite data message obtained with the following commands ASCII aR0 ar0 NMEA 0183 aR0 ar0 SDI 12 aM aMC aC and aCC SDI 12 continuous aR and aRC 9th bit Dn Wind direction minimum 10th bit Dm Wind direction averag...

Страница 100: ...ull calculations see section Wind Measurement Principle on page 23 U Speed unit M m s K km h S mph N knots D Direction offset 180 180 see Wind Direction Offset on page 37 N NMEA wind formatter T XDR transducer syntax W MWV wind speed and angle Defines whether the wind message is sent in XDR or MWV format F Sampling rate 1 2 or 4 Hz Defines how frequently the wind is measured Lower sampling rate re...

Страница 101: ...tting with the following command Select the correct value letter for the setting fields see Setting Fields on page 97 See the examples Command format in ASCII and NMEA 0183 aWU R x A x G x U x D x N x F x cr lf Command format in SDI 12 aXWU R x A x G x U x D x N x F x where R I A G U D N F The wind sensor setting fields see Setting Fields on page 97 x Value for the setting cr lf Command terminator...

Страница 102: ...f Changing the averaging time to 20 seconds wind speed unit to knots and direction offset to 10 0WU A 20 U N D 10 cr lf 0WU A 20 U N D 10 cr lf Changing the wind parameter selection 0WU R 0100100001001000 cr lf 0WU R 01001000 00100100 cr lf The wind message response after the change above 0R1 cr lf 0R1 Dm 268D Sm 1 8N cr lf Example SDI 12 device address 0 Changing the measurement interval to 10 se...

Страница 103: ...d you can check the current supervisor settings Command format in ASCII and NMEA 0183 aSU cr lf Command format in SDI 12 aXSU The response in ASCII and NMEA 0183 aSU R R I I S S H Y cr lf The response in SDI 12 aXSU R R I I S S H Y cr lf where a Device address SU Supervisor settings command in ASCII and NMEA 0183 XSU Supervisor settings command in SDI 12 cr lf Command terminator in ASCII and NMEA ...

Страница 104: ...tage 5th bit Id Information field 6th bit spare 7th bit spare 8th bit spare delimiter The bits 9 16 determine the supervisor parameters included in the composite data message obtained with the following commands ASCII aR0 and ar0 NMEA 0183 aR0 ar0 SDI 12 aM aMC aC and aCC SDI 12 continuous aR and aRC 9th bit Th Heating temperature 10th bit Vh Heating voltage 11th bit Vs Supply voltage 12th bit Vr ...

Страница 105: ...u can change the following settings parameters included in the supervisor data message update interval error messaging on off and heating control Make the desired setting with the following command Select the correct value letter for the setting fields see Setting Fields on page 102 See the examples Command format in ASCII and NMEA 0183 aSU R x S x H x cr lf Command format in SDI 12 aXSU R x S x H...

Страница 106: ...the composite data message aR0 can be defined in the parameter selection fields of each parameter aWU R and aSU R See parameter tables of wind sensor and supervisor message in the previous sections See the following examples Example ASCII and NMEA 0183 device address 0 How to format a composite data message with average wind direction average wind speed and Id field when the original composite dat...

Страница 107: ...irection Dx and speed Sx with average wind direction Dm and average wind speed Sm 0WU R 01001000 cr lf 0WU R 11110000 01001000 cr lf Remove the heating temperature Th data from the composite data message and include the information field Id 0SU R 00001000 cr lf 0SU R 11110000 00001000 cr lf The final composite data message query and response in ASCII 0R0 cr lf 0R0 Dm 009D Sm 0 2M Id HEL___ cr lf ...

Страница 108: ...User s Guide ______________________________________________________________________ 106 __________________________________________________________________M210925EN B ...

Страница 109: ... and contact information for Vaisala Service Centers Cleaning To ensure the accuracy of measurement results Ultrasonic Wind Sensor WMT52 needs to be cleaned when it gets contaminated Leaves and other such particles need to be removed from the wind transducers and the sensor is recommended to be cleaned carefully with a soft lint free cloth moistened with mild detergent CAUTION Be extremely careful...

Страница 110: ...33 4500 Fax 1 781 933 8029 E mail us customersupport vaisala com EUROPEAN SERVICE CENTER Vaisala Instruments Service Vanha Nurmijärventie 21 FIN 01670 Vantaa FINLAND Phone 358 9 8949 2658 Fax 358 9 8949 2295 E mail instruments service vaisala com TOKYO SERVICE CENTER Vaisala KK 42 Kagurazaka 6 Chome Shinjuku Ku Tokyo 162 0825 JAPAN Phone 81 3 3266 9617 Fax 81 3 3266 9655 E mail aftersales asia vai...

Страница 111: ... a sign or the data values are irrelevant Blockage trash leaves branches bird snow ice between the wind transducers Incorrect cr lf settings in the terminal program Remove the blockage and check that the wind transducers are not damaged If the blockage is ice or snow it will melt after some time if heating is enabled Time for clearance depends on the severity of the weather event If birds are caus...

Страница 112: ...mmands and cr lf with different serial settings in terminal program When the communication parameters match the device responds with its address The settings can now be changed using aXU SDI 12 or aXU cr lf ASCII NMEA commands A software hardware reset is needed to validate the changes Incorrect cr lf settings in the terminal program In ASCII and NMEA protocols both cr and lf are required after ea...

Страница 113: ...col may not be the one you want Check the communication protocol of the device by using the Vaisala Configuration Tool or any terminal with command aXU M SDI 12 aXU M cr lf ASCII NMEA and change it if needed See Chapter 6 Connection Options on page 51 Some parameters are missing from the data messages The formatting of the data messages is not what you expect Format the data messages of the concer...

Страница 114: ...Ask the device address with the SDI 12 or cr lf ASCII and NMEA command and retype the command with the correct address 03 Unknown cmd error The command is not supported use the correct command format see Chapter 7 Getting the Data Messages on page 61 04 Profile reset Checksum error in configuration settings during power up Factory settings used instead 05 Factory reset Checksum error in calibratio...

Страница 115: ...le deviation check the wiring Note that wire gauge needs to be large enough to avoid remarkable voltage drop in the cable Operating Voltage Control The supervisor message aSU see Supervisor Message on page 101 shows you continuously monitored supply voltage level Vs In case of deviations between the supplied voltage and monitored voltage check the wiring and the power supply Technical Support NOTE...

Страница 116: ...User s Guide ______________________________________________________________________ 114 __________________________________________________________________M210925EN B ...

Страница 117: ...roperty Description Value Wind speed range 0 60 m s response time 0 25 s available variables average maximum and minimum accuracy 3 at 10 m s output resolution 0 1 m s km h mph knots units available m s km h mph knots Wind direction azimuth 0 360 response time 0 25 s available variables average maximum and minimum accuracy 3 0 output resolution 1 Measurement frame averaging time 1 3600 s 60 min at...

Страница 118: ...C Serial data interfaces SDI 12 RS 232 RS 485 RS 422 Communication protocols SDI 12 v1 3 ASCII automatic polled NMEA 0183 v3 0 with query option 1 Below 5 3 V the measurement performance for high wind speeds may be degraded Table 14 Operating Conditions Property Description Value Housing protection class IP65 without mounting kit IP66 with mounting kit attached Temperature operation 52 60 C 60 140...

Страница 119: ...EC 61000 4 3 RF field immunity 10 V m A IEC 61000 4 4 Electric fast transient 2 kV B IEC 61000 4 5 Surge 2 kV B IEC 61000 4 6 Conducted RF immunity 3 Vemf A 1 A Normal performance B Temporary degradation self recoverable C Temporary degradation operator intervention needed D not recoverable Table 16 Materials Property Description Value Housing Polycarbonate 20 glass fibre Weight WMT52 510 g with m...

Страница 120: ...ool software and USB service cable 220614 USB service cable adapter for WXT510 WMT50 221523 2 meter cable with 8 pin M12 female connector 222287 10 meter cable with 8 pin M12 female connector 222288 10 meter extension cable with 8 pin M12 female and male connectors 215952 40 meter cable open ends 217020 Bushing and Grounding kit 222109 WMT52 Bottom assembly WMTBOTTOMSP Mounting Kit 212792 Surge Pr...

Страница 121: ...__________________________________________________ Technical Specifications VAISALA______________________________________________________________________ 119 Dimensions 0803 045 Figure 25 WMT52 Dimensions in mm inch ...

Страница 122: ..._____________________________________________________________M210925EN B 0505 211 Figure 26 Mounting Kit Dimensions in mm inch The following numbers refer to Figure 19 on page 94 1 Mounting kit with adapter sleeve for ø26 7 mm mast tube 2 Mounting kit without adapter sleeve for ø30 mm mast tube ...

Страница 123: ...n protocol and 2 Using RS 485 serial interface and one of the following communication protocols ASCII or NMEA 0183 v3 0 SDI 12 Serial Interface Wiring 1 Make the SDI 12 wiring in WMT52 as described in Chapter 5 Wiring and Power Management on page 39 Remember to combine the two Data in out wires of each WMT52 either in the internal screw terminal inside or outside the sensor 2 In the data logger en...

Страница 124: ...on settings 2XXU A 2 M S C 1 B 1200 D 7 P E S 1 L 25 If simultaneous measurements of the different units are needed Start concurrent measurement commands aC and aCC should be use for all devices If the measurements are to be performed consecutively for only one unit at time in addition to these also Start measurement commands aM and aMC can be used Start continuous measurement commands aR1 aR5 aR ...

Страница 125: ...e a bus with three WMT52s WMT52 1 communication settings 0XU A 0 M P C 3 I 0 B 19200 D 8 P N S 1 L 25 WMT52 2 communication settings 1XU A 1 M P C 3 I 0 B 19200 D 8 P N S 1 L 25 WMT52 3 communication settings 2XU A 2 M P C 3 I 0 B 19200 D 8 P N S 1 L 25 Example composite data message queries to the sensors 1 and 3 are assigned as follows 0R0 cr lf 1R0 cr lf 2R0 cr lf NOTE No matter which communica...

Страница 126: ...0 D 8 P N S 1 L 25 WMT52 2 communication settings 0XU A 0 M Q C 3 I 0 B 4800 D 8 P N S 1 L 1000 WMT52 3 communication settings 0XU A 0 M Q C 3 I 0 B 4800 D 8 P N S 1 L 2000 Now when the XDR query command WIQ XDR 2D cr lf is sent WMT52 1 responds after 25 ms WMT52 2 after 1000 ms and WMT52 3 responds after 2000 ms The sufficient delays depend on the maximum number of characters in the response mess...

Страница 127: ... 6 55 cr lf WIXDR C 23 5 C 4 C 24 3 C 4 H 49 3 P 4 P 1010 1 H 3 59 cr lf WIXDR V 0 000 I 4 Z 0 s 4 R 0 00 I 4 V 0 0 M 5 Z 0 s 5 R 0 0 M 5 67 cr lf WIXDR C 25 8 C 6 U 10 6 N 4 U 10 9 V 5 U 3 362 V 6 78 cr lf The third sensor address 8 WIXDR A 341 D 8 A 347 D 9 A 357 D 10 S 0 1 M 8 S 0 2 M 9 S 0 2 M 10 53 cr lf WIXDR C 23 5 C 8 C 24 3 C 9 H 49 3 P 8 P 1010 1 H 8 5F cr lf WIXDR V 0 000 I 8 Z 0 s 8 R ...

Страница 128: ...mmands the same message parameter configuration as in the previous example WMT52 1 communication settings 0XU A 0 M Q C 3 I 0 B 4800 D 8 P N S 1 L 25 WMT52 2 communication settings 0XU A 1 M Q C 3 I 0 B 4800 D 8 P N S 1 L 25 WMT52 3 communication settings 0XU A 2 M Q C 3 I 0 B 4800 D 8 P N S 1 L 25 The query for WMT52 1 and the response 0R cr lf WIXDR A 316 D 0 A 326 D 1 A 330 D 2 S 0 1 M 0 S 0 1 ...

Страница 129: ... 9 V 1 U 3 362 V 2 78 cr lf The query for WMT52 3 and the response 2R cr lf WIXDR A 341 D 2 A 347 D 3 A 357 D 4 S 0 1 M 2 S 0 2 M 3 S 0 2 M 4 53 cr lf WIXDR C 23 5 C 2 C 24 3 C 3 H 49 3 P 2 P 1010 1 H 2 5F cr lf WIXDR V 0 000 I 2 Z 0 s 2 R 0 00 I 2 V 0 0 M 3 Z 0 s 3 R 0 0 M 3 61 cr lf WIXDR C 25 8 C 4 U 10 6 N 2 U 10 9 V 2 U 3 360 V 3 7C cr lf If needed for making the transducers IDs distinguishab...

Страница 130: ...User s Guide ______________________________________________________________________ 128 __________________________________________________________________M210925EN B ...

Страница 131: ... 12 standard text is available from the SDI 12 web site in the following address www sdi 12 org SDI 12 Electrical Interface The SDI 12 electrical interface uses the SDI 12 bus to transmit serial data between SDI 12 data recorders and sensors The SDI 12 bus is the cable that connects multiple SDI 12 devices This is a cable with three conductors a serial data line a ground line and a 12 volt line Th...

Страница 132: ...n a data recorder tells a sensor to start its measurement procedure the recorder does not communicate with any other sensor until the data collection from the first sensor is complete A typical recorder sensor measurement sequence proceeds in the following order 1 The data recorder wakes all sensors on the SDI 12 bus with a break 2 The recorder transmits a command to a specific addressed sensor in...

Страница 133: ...k by setting the data line to spacing for at least 12 milliseconds The sensor will not recognize a break condition for a continuous spacing time of less than 6 5 milliseconds The sensor will always recognize a break when the line is continuously spacing for more than 12 milliseconds When receiving a break a sensor must detect 8 33 milliseconds of marking on the data line before it looks for an add...

Страница 134: ...onds tolerance 0 40 milliseconds No more than 1 66 milliseconds of marking are allowed between the end of the stop bit and the start bit for example between characters on any characters in the command or the response no tolerance This permits a response to an M command to be sent within a 380 millisecond window Sensors must return to a low power standby mode after receiving an invalid address or a...

Страница 135: ...unsigned integers The least significant bit is on the right Numbers preceded by 0x are in hexadecimal All shifts shift in a zero The algorithm is Initialize the CRC to zero For each character beginning with the address up to but not including the carriage return cr do as follows Set the CRC equal to the exclusive OR of the character and itself for count 1 to 8 if the least significant bit of the C...

Страница 136: ... cr lf Parity is applied to all three characters if selected for the character frame The CRC computation code is added to the end of the response if the first letter of the command is sent by using lower case NMEA 0183 v3 0 Checksum Computation The checksum is the last field in the NMEA sentence and follows the checksum delimiter character It is the 8 bit exclusive OR of all characters in the sent...

Страница 137: ...urement is in progress during the corresponding second Update internal calculation is always made in the end of the update interval In the auto sending protocols ASCII automatic CRC and NMEA automatic outputting the data messages is synchronized to take place immediately after the update In ASCII polled CRC NMEA query and SDI 12 continuous measurement protocols trying to request data before the up...

Страница 138: ...c time 1 sec I A all communication protocols other than SDI 12 aXU M S In this example I 5 sec and A 3 sec I A all communication protocols other than SDI 12 aXU M S In this example I 2 sec and A 5 sec I I I I A A A A A time 1 sec Communication protocol SDI 12 aXU M S In this example A 3 sec I does not have any function in this protocol Issuing measurement command Data ready A Issuing measurement c...

Страница 139: ..._______________________________ 137 APPENDIX E FACTORY CONFIGURATIONS The factory configurations are read only settings which cannot be modified For each settings command the following information is shown the command to retrieve the settings ends with character an example response from the WMT a table describing the messsage contents ...

Страница 140: ...meters o Order code Ordering identity as delivered 10 characters c Calibration date Y 2003 A B 2005 2006 1 52 week 1 7 weekday i Info Factory signature 10 characters n Device s n A B 2005 2006 1 52 week 1 7 weekday 1 9999 serial number 2 2 5 V reference 2500mV default 3 3 5 V reference 3500mV default Table 20 Wind Configuration Settings Field Character Field Name Description g Strategy A All N Nor...

Страница 141: ...ings 0SF 0SF t 19 8 b 17159 l 50 0 m 4 0 h 10 0 cr lf Table 21 General Unit Settings Field Character Field Name Description t Heat control calibration temp 50 0 60 0 C calibrate to Ta b Direct ADC value of temp diode 0 4096 l Defrosting limit w 50 duty cycle 100 0 m C default 4 0 C m Heating limit w full power l h C default 0 0 C h Heating limit w 50 duty cycle m 100 0 C default 4 0 C ...

Страница 142: ...User s Guide ______________________________________________________________________ 140 __________________________________________________________________M210925EN B ...

Страница 143: ...www vaisala com M210925EN ...

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