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Chapter 7 __________________________________________________ Getting the Data Messages

VAISALA_______________________________________________________________________ 85

Start Measurement Command with
CRC (aMC)

Command format:

aMCx!

This command has the same function as the

aM

but a three-character

CRC is added to the response data strings before <cr><lf>. In order to
request the measured data, Send data command

aD

should be used, see

the following sections.

Start Concurrent Measurement (aC)

This command is used when there are several devices on the same bus
and simultaneous measurements are needed from the devices, or if more
than nine (9) measurement parameters are requested from a single
device.

The measured data is not sent automatically and it should be requested
with separate Send data command

aD

. See

Examples of aM, aC and aD

Commands on page 88

.

NOTE

For changing the message parameters, units and other settings, see

Chapter 8, Sensor and Data Message Settings, on page 107

.

NOTE

When the measurement takes less than one second, the response part
two is not sent. In WXT520 this is the case in the precipitation
measurement aM3.

NOTE

The maximum number of parameters that can be measured with aM
and aMC commands is nine (9). If more parameters are to be
measured, Start concurrent measurement commands aC and aCC
should be used (for which the maximum number of parameters to be
measured is 20), see the following sections.

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Содержание WXT520

Страница 1: ...USER S GUIDE Vaisala Weather Transmitter WXT520 M210906EN C...

Страница 2: ...t 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 t...

Страница 3: ...ODUCT OVERVIEW 17 Weather Transmitter WXT520 17 Heating Function 18 Optional Software for Easy Settings 18 WXT520 Transmitter Components 19 CHAPTER 3 FUNCTIONAL DESCRIPTION 25 Wind Measurement Princip...

Страница 4: ...e Cable Connection 58 Connection Through M12 Bottom Connector or Screw Terminal 59 Communication Setting Commands 60 Checking the Current Communication Settings aXU 60 Setting Fields 61 Changing the C...

Страница 5: ...ice Address 93 Acknowledge Active Command a 94 MWV Wind Speed and Direction Query 94 XDR Transducer Measurement Query 96 TXT Text Transmission 104 Automatic Mode 106 Automatic Composite Data Message a...

Страница 6: ...rials 144 General 144 Options and Accessories 145 Dimensions mm inch 146 APPENDIX A NETWORKING 149 Connecting Several WXT520s on the Same Bus 149 SDI 12 Serial Interface 149 Wiring 149 Communication P...

Страница 7: ..._______ VAISALA________________________________________________________________________ 5 APPENDIX E FACTORY CONFIGURATIONS 165 General Unit Settings 166 Wind Configuration Settings 166 PTU Configurat...

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

Страница 9: ...o Pole Mast Using Optional Mounting Kit 36 Figure 14 Mounting WXT520 to Cross Arm L Profile 37 Figure 15 Mounting Bolt Location in Cross Arm 38 Figure 16 Grounding Using the Bushing and Grounding Kit...

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

Страница 11: ...Units 70 Table 7 Transducer IDs of the Measurement Parameters 98 Table 8 Transducer Table 104 Table 9 Data Validation 133 Table 10 Communication Problems 134 Table 11 Error Messaging Text Messages Tab...

Страница 12: ...________________________________________________________________________________ 10 ______________________________________________________________________________...

Страница 13: ...ansmitter WXT520 Contents of This Manual This manual consists of the following chapters Chapter 1 General Information This chapter provides general notes for the product Chapter 2 Product Overview Thi...

Страница 14: ...3 and SDI 12 Chapter 9 Maintenance This chapter contains instructions for the basic maintenance of Weather Transmitter WXT520 and contact information for Vaisala Service Centers Chapter 10 Troubleshoo...

Страница 15: ...nded 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 deliv...

Страница 16: ...latory Compliance The electromagnetic compatibility of the WXT520 has been tested according to the following product family standard EN 61326 1 Electrical equipment for measurement control and laborat...

Страница 17: ...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 Vai...

Страница 18: ...User s Guide ______________________________________________________________________ 16 __________________________________________________________________ M210906EN C...

Страница 19: ...ISALA_______________________________________________________________________ 17 CHAPTER 2 PRODUCT OVERVIEW This chapter introduces the unique features and advantages of the Vaisala Weather Transmitter...

Страница 20: ...connector for installation and a 4 pin M8 connector for service use The following options are available Heating function for the precipitation and wind sensors Service Pack 2 Windows based Vaisala Co...

Страница 21: ..._________________________________________________________________ 19 WXT520 Transmitter Components 0804 021 Figure 2 Main Components of Weather Transmitter WXT520 The following numbers refer to Figure...

Страница 22: ...________________________________________________________ M210906EN C 0803 028 Figure 3 Cut Away View The following numbers refer to Figure 3 on page 20 1 Wind transducers 3 pcs 2 Precipitation sensor...

Страница 23: ...____ 21 0803 029 Figure 4 Bottom of Transmitter The following numbers refer to Figure 4 on page 21 1 Alignment direction sign 2 4 pin M8 connector for Service Port 3 Water tight cable gland optional i...

Страница 24: ...ounting kit alignment is needed only when mounting for the first time Using the mounting kit also improves the IP classification of the WXT520 to IP66 Without the mounting kit the WXT520 is IP65 0804...

Страница 25: ...g upward The kit is installed on top of the transmitter 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 mini...

Страница 26: ...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 agai...

Страница 27: ...or 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 tra...

Страница 28: ...eed in selected units m s kt mph km h The wind direction is expressed in degrees The wind direction reported by WXT520 indicates the direction that the wind comes from North is represented as 0 east a...

Страница 29: ...ala RAINCAP Sensor 2 technology in precipitation measurement The precipitation sensor comprises of a steel cover and a piezoelectrical sensor mounted on the bottom surface of the cover The precipitati...

Страница 30: ...cipitation message 10 seconds after the recognition of the first drop The messages are sent continuously as the precipitation proceeds and stopped when the precipitation ends Tipping bucket mode This...

Страница 31: ...the temperature dependency of the pressure and humidity sensors The PTU module includes capacitive silicon BAROCAP sensor for pressure measurement capacitive ceramic THERMOCAP sensor for air temperat...

Страница 32: ...ol The following example shows how heating behaves as Ta starts to fall When Ta falls below 4 C heating is enabled Heating keeps Th 4 C until Ta 1 C Heating keeps Th 0 C until Ta 15 C When the heating...

Страница 33: ...that is intended to help you install Weather Transmitter WXT520 Unpacking the Transmitter Weather Transmitter WXT520 comes in a custom shipping container Be careful when removing the device from the c...

Страница 34: ...ent measurements The site should represent the general area of interest Weather Transmitter WXT520 should be installed in a location that is free from turbulence caused by nearby objects such as trees...

Страница 35: ...tect personnel and the device a lightning rod should be installed with the tip at least one meter above WXT520 The rod must be properly grounded compliant with all applicable local safety regulations...

Страница 36: ...onto a horizontal cross arm When mounting WXT520 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...

Страница 37: ...nal 1 Insert the mounting kit adapter to the transmitter 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 posit...

Страница 38: ...__________ M210906EN C 0803 031 Figure 13 Mounting WXT520 to Pole Mast Using Optional Mounting Kit The following numbers refer to Figure 13 on page 36 1 Mounting kit 2 Fixing screw NOTE When removing...

Страница 39: ...h north direction see Aligning WXT520 on page 41 In case the cross arm cannot be aligned make the wind direction offset as instructed in section Wind Direction Offset on page 42 3 Mount the transmitte...

Страница 40: ...surface of the mounting point is painted or has some other finishing that prevents a good electrical connection consider using the Bushing and Grounding Kit and a cable to provide the ground connectio...

Страница 41: ...ations If it is grounded to the hull of a ship ship s ground you must remove the grounding jumper inside the WXT520 When the jumper is removed the signal ground is DC isolated from the chassis ground...

Страница 42: ...e screw terminals you should remove the jumper at the same time 1 Loosen the three long screws at the bottom of WXT520 2 Pull out the bottom part of the transmitter 3 Remove the grounding jumper from...

Страница 43: ...compass The magnetic declination is the difference in degrees between the true north and magnetic north The source for the magnetic declination should be current as the declination changes over time 0...

Страница 44: ...true north should be given to WXT520 1 Mount the transmitter to a desired position see section Mounting on page 34 2 Define the deviation angle from the north zero alignment Use the sign indication to...

Страница 45: ...Power Supplies Operating voltage Vin 5 32 VDC Notice that for the average current consumption see the graphs in Figure 20 on page 44 The minimum consumption graph is for SDI 12 standby mode The input...

Страница 46: ...voltage the lower the current see Figure 20 on page 44 0805 023 Figure 20 Average Operational Current Consumption with 4Hz Wind Sensor Sampling Heating voltage Vh one of the following three alternati...

Страница 47: ...cally 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...

Страница 48: ...isted in the table below The signal names Data in RxD and Data out TxD in the table describe the direction of data flow as seen from WXT520 The terms Default wiring and RS 422 wiring refer to the two...

Страница 49: ...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 WXT520 For testing purposes...

Страница 50: ...er supply wires and signal wires through the cable gland s in the bottom of the transmitter Cable glands are included in the optional Bushing and Grounding Kit order code 222109 4 Connect the wires ac...

Страница 51: ...D 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 f...

Страница 52: ...n resistors should 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 is suitable for twisted pair lines Resistors are co...

Страница 53: ...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 Any sensor measurement while being activated adds...

Страница 54: ...g time than starting the Automatic message However care should be taken when selecting Precipitation Autosend mode where the submodes M R and M C may cause extra consumption in rainy conditions as tri...

Страница 55: ...uld be on some 0 08 mA additional current is drawn from the operational power supply NOTE While in Service mode and or while supplied through the Service port the WXT520 consumes 0 3 0 6 mA more than...

Страница 56: ...User s Guide ______________________________________________________________________ 54 __________________________________________________________________ M210906EN C...

Страница 57: ...ve 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 Ta...

Страница 58: ...nd 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 WXT520 Table 4 Connection Cable Options Cable Name Connector on Sens...

Страница 59: ...n 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...

Страница 60: ...t of your PC and the M8 service port connector on the bottom plate of the transmitter by using the USB service cable See Figure 4 on page 21 2 Open the Vaisala Configuration Tool or a terminal program...

Страница 61: ...crew 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 i...

Страница 62: ...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 transmitter are presented in italic where a Device address which may consist o...

Страница 63: ...ous measurement T Test parameter for testing use only C Serial interface 1 SDI 12 2 RS 232 3 RS 485 4 RS 422 I Automatic repeat interval for Composite data message 1 3600 s 0 no automatic repeat B Bau...

Страница 64: ...XXU 0XXU A 0 M S T 0 C 1 I 0 B 1200 D 7 P E S 1 L 25 N WXT520 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 lowes...

Страница 65: ...ields see Setting Fields on page 61 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...

Страница 66: ...ation 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 I 0 B 19200 D...

Страница 67: ...ion for data message commands For changing the message parameters units and other settings see Chapter 8 Sensor and Data Message Settings on page 107 NOTE Type commands in CAPITAL letters NOTE The par...

Страница 68: ...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 resp...

Страница 69: ...and hail accumulation and duration parameters Rc Rd Hc and Hd Command format in ASCII and NMEA 0183 aXZRU cr lf Command format in SDI 12 aXZRU Example ASCII 0XZRU cr lf 0TX Rain reset cr lf Example S...

Страница 70: ...12 aXZRI Example ASCII 0XZRI cr lf 0TX Inty reset cr lf Example SDI 12 0XZRI 0 cr lf device address Example NMEA 0183 0XZRI cr lf WITXT 01 01 11 Inty reset 39 cr lf where a Device address XZRI Precipi...

Страница 71: ...measurements of the transmitter 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 E...

Страница 72: ...M I Ta Air temperature C F C F Tp Internal temperature C F C F Ua Relative humidity RH P Rc Rain accumulation mm in M I Rd Rain duration s S Ri Rain intensity mm h in h M I Rp Rain peak intensity mm...

Страница 73: ...smitter is connected to the bus see Appendix A Networking on page 149 If you need to change the device address see Changing the Communication Settings aXU on page 63 Acknowledge Active Command a This...

Страница 74: ...Example of the response the parameter set is configurable 0R1 Dn 236D Dm 283D Dx 031D Sn 0 0M Sm 1 0M Sx 2 2M cr lf where a Device address cr lf Response terminator where a Device address R1 Wind mess...

Страница 75: ...emperature and humidity data message Command format aR2 cr lf Example of the response the parameter set is configurable 0R2 Ta 23 6C Ua 14 2P Pa 1026 6H cr lf To change the parameters and units in the...

Страница 76: ...s Hi 0 0M Rp 0 0M Hp 0 0M cr lf To change the parameters or the units in the response message and to make other precipitation sensor settings see section Precipitation Sensor on page 117 where a Devic...

Страница 77: ...e response message and to make other settings see section Supervisor Message on page 123 The content of the parameter Id is a text string which can be modified by using the Vaisala Configuration Tool...

Страница 78: ...1M cr lf 0R2 Ta 74 6F Ua 14 7P Pa 1012 9H cr lf 0R3 Rc 0 10M Rd 2380s Ri 0 0M Hc 0 0M Hd 0s Hi 0 0M cr lf 0R5 Th 76 1F Vh 11 5N Vs 11 5V Vr 3 510V Id HEL___ cr lf Composite Data Message Query aR0 Thi...

Страница 79: ...ious sections but type the first letter of the command in lower case and add a correct three character CRC before the command terminator The response contains also a CRC For more information about the...

Страница 80: ...ters to be included in the response messages changing the units and making other configurations of the measured parameters see Chapter 8 Sensor and Data Message Settings on page 107 where a Device add...

Страница 81: ...2380s Ri 0 0M Hc 0 0M Hd 0s Hi 0 0M cr lf 0R5 Th 76 1F Vh 11 5N Vs 11 5V Vr 3 510V cr lf Example with CRC 0r1 Sn 0 1M Sm 0 1M Sx 0 1MGOG cr lf 0r2 Ta 22 7C Ua 55 5P Pa 1004 7H Fn cr lf 0r3 Rc 0 00M Rd...

Страница 82: ...ter are available except those for the Continuous measurement In the Continuous mode aXU M R measurements are made at user configurable update intervals see Chapter 8 Sensor and Data Message Settings...

Страница 83: ...cted to the bus they will all respond causing a bus collision Command format The response a cr lf Example device address 0 0 cr lf Acknowledge Active Command a This command is used to ensure that a de...

Страница 84: ...sponded 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 The response b cr lf Ex...

Страница 85: ...3Y2630000 cr lf Start Measurement Command aM This command asks the device to make a measurement The measured data are not sent automatically and should be requested with a separate Send data command a...

Страница 86: ...aM aC and aD Commands on page 88 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 requested a cr lf...

Страница 87: ...ices or if more than nine 9 measurement parameters are requested from a single device The measured data is not sent automatically and it should be requested with separate Send data command aD See Exam...

Страница 88: ...ss C Start concurrent measurement command x The desired measurement 1 Wind 2 Temperature humidity and pressure 3 Precipitation 5 Supervisor If x is left out the query refers to combined data message i...

Страница 89: ...he 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...

Страница 90: ...urement in progress 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 followi...

Страница 91: ...the device address is not sent 0D0 0 0 15 20 0 0 0 0 0 0 0 cr lf Example 4 Start a supervisor measurement with CRC and request the data 0MC5 00014 cr lf measurement ready in one second and 4 parameter...

Страница 92: ...sign of a completed measurement 0D0 0 069 079 084 0 1 0 6 1 1 21 1 21 7 32 0 1000 3 0 02 20 0 0 0 0 cr lf 0D1 0 0 0 0 1 3 0 0 0 77 1 cr lf Continuous Measurement aR The device can be configured so tha...

Страница 93: ...0 0 23 8 cr lf where a Device address R Start continuous measurement command x The desired sensor to make the measurement 1 Wind 2 Temperature humidity pressure 3 Precipitation 5 Supervisor If x is le...

Страница 94: ...rmat aRCx Has the same function 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...

Страница 95: ...ings on page 107 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 161 Device Address This command is...

Страница 96: ...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 paramete...

Страница 97: ...ype 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 terminat...

Страница 98: ...r 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 setting...

Страница 99: ...asurement data from the first transducer u1 Units of the first transducer measurement see the following transducer table c c1 First transducer identification id WXT520 s address aXU A is added as a ba...

Страница 100: ...et transducer ids A A 1 and A 2 respectively where A is WXT520 address aXU A The same applies for the wind direction Temperature internal temperature and heating temperature have the same unit thus th...

Страница 101: ...lf P T and RH data WIXDR C 23 3 C 0 C 24 0 C 1 H 50 1 P 0 P 1009 5 H 0 75 cr lf Precipitation data WIXDR V 0 02 M 0 Z 30 s 0 R 2 7 M 0 V 0 0 M 1 Z 0 s 1 R 0 0 M 1 R 6 3 M 2 R 0 0 M 3 51 cr lf Supervis...

Страница 102: ...direction 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 Transduc...

Страница 103: ...lowing Transducer table 23 3 Transducer id 0 data Temperature C Transducer id 0 units C Temperature 0 Transducer id for Temperature C Transducer id 1 type temperature 23 3 Transducer id 1 data Tp inte...

Страница 104: ...sducer id 0 data Rain intensity M Transducer id 0 units mm h Rain intensity 0 Transducer id for Rain intensity V Transducer id 1 type Hail accumulation 0 0 Transducer id 1 data Hail accumulation M Tra...

Страница 105: ...r table 20 4 Transducer id 2 data Heating temperature C Transducer id 2 units C Heating temperature 2 Transducer id for Heating temperature U Transducer id 0 type voltage 12 0 Transducer id 0 data Hea...

Страница 106: ...Heating voltage field Table 8 Transducer Table Transducer Type Units Field Comments Temperature C C Celsius F Fahrenheit Angular displacement wind direction A D degrees Wind speed S K km h M m s N kn...

Страница 107: ...re disabled from the wind message WITXT 01 01 03 Unknown cmd error 1F unknown command 0XO cr lf WITXT 01 01 08 Use chksum 2F 72 wrong checksum used in MWV query command WI Talker identifier WI weather...

Страница 108: ...nsor and Data Message Settings on page 107 Automatic Composite Data Message aR0 When automatic composite data messaging is selected the transmitter sends composite data messages at user configurable i...

Страница 109: ...ng 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 c...

Страница 110: ...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...

Страница 111: ...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...

Страница 112: ...alculations see section Wind Measurement Principle on page 25 U Speed unit M m s K km h S mph N knots D Direction offset 180 180 see section Wind Direction Offset on page 42 N NMEA wind formatter T XD...

Страница 113: ...th the following command Select the correct value letter for the setting fields see Setting Fields on page 109 See the examples Command format in ASCII and NMEA 0183 aWU R x I x A x G x U x D x N x F...

Страница 114: ...hanging the averaging time to 20 seconds the 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 01001000010...

Страница 115: ...The response in ASCII and NMEA 0183 aTU R R I I P P H H cr lf The response in SDI 12 aXTU R R I I P P H H cr lf where R I P H are the setting fields see the following section Example ASCII and NMEA 01...

Страница 116: ...essure 2nd bit Ta Air temperature 3rd bit Tp Internal temperature1 1 Tp temperature value is used in pressure calculation it does not express the air temperature 4th bit Ua Air humidity 5th bit spare...

Страница 117: ...ds see Setting Fields on page 114 See the examples Command format in ASCII and NMEA 0183 aTU R x I x P x T x cr lf Command format in SDI 12 aXTU R x I x P x T x Examples ASCII and NMEA 0183 device add...

Страница 118: ..._____________________ M210906EN C Changing the update interval 0TU I 30 cr lf 0TU I 30 cr lf The response after the change 0R2 cr lf 0R2 Ta 23 9C Ua 26 7P cr lf Example SDI 12 device address 0 Changin...

Страница 119: ...R R I I U U S S M M Z Z X X Y Y cr lf The response in SDI 12 aXRU R R I I U U S S M M Z Z X X Y Y cr lf where R I U S M Z X Y are the setting fields see the following section Example ASCII and NMEA 0...

Страница 120: ...unt 2nd bit Rd Rain duration 3rd bit Ri Rain intensity 4th bit Hc Hail amount 5th bit Hd Hail duration 6th bit Hi Hail intensity 7th bit Rp Rain peak 8th bit Hp Hail peak delimiter The bits 9 16 deter...

Страница 121: ...bucket The transmitter sends a precipitation message at each unit increment 0 1 mm 0 01 in This simulates conventional tipping bucket method T time based Transmitter sends a precipitation message in...

Страница 122: ...to zero If the hail unit aRU S x is metric the limit corresponds the range between 10 0 6553 5 hits cm2 If the unit is imperial the equivalent range varies between 100 65535 hits in2 If the unit is hi...

Страница 123: ...hail accumulation limit Make the desired setting with the following command Select the correct value letter for the setting fields see Setting Fields on page 118 See the examples Command format in ASC...

Страница 124: ...r lf Making the Rain amount Rc and Rain intensity Ri available both in the precipitation message and composite data message 0RU R 1010000010100000 cr lf 0RU R 10100000 10100000 cr lf The response afte...

Страница 125: ...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...

Страница 126: ...age 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 followin...

Страница 127: ...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...

Страница 128: ..._______________________ M210906EN C Example ASCII and NMEA 0183 device address 0 Disabling the heating and error messaging 0SU S N H N cr lf 0SU S N H N cr lf Example SDI 12 device address 0 Changing...

Страница 129: ...ains following data maximum wind direction maximum wind speed temperature humidity pressure accumulated rainfall supply voltage and heating voltage 0R0 cr lf 0R0 Dx 009D Sx 0 2M Ta 23 3C Ua 37 5P Pa 9...

Страница 130: ..._________________________________ 128 _________________________________________________________________ M210906EN C The final composite data message query and response in ASCII 0R0 cr lf 0R0 Dm 009D S...

Страница 131: ...XT520 and contact information for Vaisala Service Centers Cleaning To ensure the accuracy of measurement results Weather Transmitter WXT520 should be cleaned when it gets contaminated Leaves and other...

Страница 132: ...igure 26 on page 130 and remove the PTU module 4 Remove the vacuum bag protecting the PTU module Connect the new PTU module Avoid touching the white filter cap with your hands when handling the PTU mo...

Страница 133: ...33 4500 Fax 1 781 933 8029 E mail us customersupport vaisala com EUROPEAN SERVICE CENTER Vaisala Instruments Service Vanha Nurmij rventie 21 FIN 01670 Vantaa FINLAND Phone 358 9 8949 2658 Fax 358 9 89...

Страница 134: ...User s Guide ______________________________________________________________________ 132 _________________________________________________________________ M210906EN C...

Страница 135: ...ings 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 clearanc...

Страница 136: ...ommands 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 aX...

Страница 137: ...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 o...

Страница 138: ...ss 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 Gettin...

Страница 139: ...remarkable deviation check the wiring Note that wire gauge should be large enough to avoid remarkable voltage drop in the cable Operating Voltage Control The supervisor message aSU see Supervisor Mes...

Страница 140: ...User s Guide ______________________________________________________________________ 138 _________________________________________________________________ M210906EN C...

Страница 141: ...Performance Table 12 Barometric Pressure Property Description Value Range 600 1100 hPa Accuracy 0 5 hPa at 0 30 C 32 86 F 1 hPa at 52 60 C 60 140 F Output resolution 0 1 hPa 10 Pa 0 001 bar 0 1 mmHg 0...

Страница 142: ...ables 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...

Страница 143: ...uration counting each 10 second increment whenever droplet detected output resolution 10 s Rain intensity running one minute average in 10 second steps range 0 200 mm h broader range with reduced accu...

Страница 144: ...raded Average current consumption minimum 0 1 mA 12 VDC SDI 12 standby typical 3 mA 12 VDC with default measuring intervals maximum 14 mA 5 VDC with constant measurement of all parameters Heating volt...

Страница 145: ...ement or object snow ice bird etc blocking the measurement path between the ultrasonic transducer heads may affect the wind measurement accuracy or even invalidate the output data 0 60 m s Table 19 El...

Страница 146: ...20 Materials Property Description Value Radiation shield top and bottom parts Polycarbonate 20 glass fibre Precipitation sensor plate Stainless steel AISI 316 Weight 650 g 1 43 lbs Table 21 General Pr...

Страница 147: ...T510 WMT50 221523 USB RS 232 RS 485 cable M12 female 220782 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 p...

Страница 148: ...___________________________________________________________________ 146 _________________________________________________________________ M210906EN C Dimensions mm inch 0803 040 Figure 28 WXT520 Dimen...

Страница 149: ..._________________________________________________ Technical Specifications VAISALA______________________________________________________________________ 147 0805 013 Figure 29 WXT520 Dimensions Top an...

Страница 150: ..._________________________________________________________________ M210906EN C 0505 211 Figure 30 Mounting Kit Dimensions The following numbers refer to Figure 23 on page 120 1 Mounting kit with adapte...

Страница 151: ...otocol 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 WXT520 as described in Ch...

Страница 152: ...XXU A 0 M S C 1 B 1200 D 7 P E S 1 L 25 WXT520 2 communication settings 1XXU A 1 M S C 1 B 1200 D 7 P E S 1 L 25 WXT520 3 communication settings 2XXU A 2 M S C 1 B 1200 D 7 P E S 1 L 25 If simultaneou...

Страница 153: ...out CRC or NMEA query When using NMEA query the wind message should be set to XDR aWU N T ASCII Polled WXT520s on the bus shall be assigned with different addresses for example aXU A 0 1 2 Example a b...

Страница 154: ...last character of the query and the first character of the response from WXT520 Example a bus with three WXT520s WXT520 1 communication settings 0XU A 0 M Q C 3 I 0 B 4800 D 8 P N S 1 L 25 WXT520 2 co...

Страница 155: ...maximum transducer ID is three when WXT520 address is 0 Hence assigning address 4 for the second and address 8 for the third WXT520 on the bus the following responses to the XDR query WIQ XDR 2D cr l...

Страница 156: ...esses for example aXU A 0 1 2 The RS 485 line delays are not needed Example a bus with three WXT520s data requests with combined data message query commands the same message parameter configuration as...

Страница 157: ...2 S 0 2 M 3 55 cr lf WIXDR C 23 5 C 1 C 24 3 C 2 H 49 3 P 1 P 1010 1 H 1 59 cr lf WIXDR V 0 000 I 1 Z 0 s 1 R 0 00 I 1 V 0 0 M 2 Z 0 s 2 R 0 0 M 2 67 cr lf WIXDR C 25 8 C 3 U 10 6 N 1 U 10 9 V 1 U 3...

Страница 158: ...User s Guide ______________________________________________________________________ 156 _________________________________________________________________ M210906EN C...

Страница 159: ...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 b...

Страница 160: ...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 recorde...

Страница 161: ...eak 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...

Страница 162: ...nds 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...

Страница 163: ...nsigned 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...

Страница 164: ...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 low...

Страница 165: ...rement 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...

Страница 166: ...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...

Страница 167: ..._______________________________ 165 APPENDIX E FACTORY CONFIGURATIONS The factory configurations are read only settings which cannot be modified For each settings command the following information is...

Страница 168: ...eters 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 wee...

Страница 169: ...number A B 2005 2006 1 52 week 1 7 weekday 1 9999 serial number Table 26 Rain Configuration Settings Field Character Field Name Description p n Positive and negative gain 0 1 25 5 p 1 0 n 1 0 d Bypass...

Страница 170: ...User s Guide ______________________________________________________________________ 168 _________________________________________________________________ M210906EN C...

Страница 171: ...www vaisala com M210906EN...

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