Integrating Digiquartz MET3 and MET3A Broadband
Contents
1. please contact Trimble or Paroscientific Inc GPS Antenna comes with cable G p Ethernet Cable RS 232 Service Cable Power amp Ethernet Port Power Adapter Table 1 Items provided by Trimble MET Station MET Cable optional Power breakout supply kit optional Digiquartz Software CD Table 2 Items provided by Paroscientific 2003 Paroscientific Inc 3 Paroscientific Inc Technical Note Precision Pressure Instrumentation Doc No G8036 Rev NC 25 November 2003 4 Operating Principle of MET Stations MET stations include the world s most accurate stable and reliable Broadband Digiquartz Barometers environmentally packaged with a precision temperature and humidity probe Integral electronics and integrated compact packaging make installation and communication with these instruments an easy task In order for a MET station to work with any GPS receiver regardless of the GPS receiver manufacturer the following conditions must be met a The MET instrument must be powered up Paroscientific MET stations require a power source providing a voltage output of 7 to 16 VDC through pin 9 of its RS 232 connector Some GPS receivers e g Thales provide power on pin 9 of the RS 232 cable Trimble NetRS does not provide power through its communication ports So you have to use the power adapter kit optionally supplied by Paroscientific Inc If you don t have this kit please contact Paroscientific Sales an2. 5 November 2003 p Clickon the OK button You will see the Port Configuration window in Figure 12 again This time the port you just configured will show Met Tilt across the port number To start logging data in the GPS receiver you must enable datalogging Click on the Data Logging menu option You will see a window similar to the one in Figure 14 Z Trimble NetRS RS Microsoft Internet Explorer a D Tri NetR S gt Trimble NetRS Data Logging Status 7 Session Schedule Duration Status Enable Name minutes Paros Continuous 60 Disabled F Trimcom Continuous 60 Disabled O UTC Date amp Time 20 Nov 2003 Thu of GPS Week 1245 00 24 29 Logging Space 26 187 Mbytes Used 146 827 Mbytes Available AutoDelete Mode is Enabled Power Saving Mode is Disabled Create a New Session Figure 14 Trimble NetRS Data Logging Configuration q In data logging screen create a new session by clicking on the Create a New Session link Assign a name to the new session and click on the OK button If you would like to start logging data immediately select the Enable check box You can also start or stop a datalogging session any time from the datalogging menu Once datalogging is enabled NetRS interrogates the MET station at the interval it was set to r After logging is enabled observe the TX and RX lights to see if MET station receives and transmits data If the MET station recei
3. C l l power Conxall Figure 3 Trimble NetRS GPS Receiver Back Panel RS 232 Ports Port 2 Port 3 and Port 4 are used to connect to a MET3 3A Broadband Meteorological Measurement System Power connection Side B Ethernet connections Figure 4 Trimble Multiport Adapter Primary Power Ethernet portis used to provide power and Ethernet access to GPS receiver Connect the Side A of the Trimble Multi port adapter seen in Figure 4 to this port 2003 Paroscientific Inc 7 Paroscientific Inc Technical Note Precision Pressure Instrumentation Doc No G8036 Rev NC 25 November 2003 6 Trimble NetRS and MET Integration Procedure To integrate a Trimble NetRS GPS receiver with a Paroscientific MET station You will need a notebook or desktop computer to configure the receiver and access data files a Connect the appropriate end of the RS 232 cable that came with your GPS receiver to the portl service on the front panel of your GPS receiver and the other end to RS 232 port of your computer as in Figure 5 Figure 5 Front Panel Service Port RS 232 Connection b Connect the Trimble Multiport adapter to the Primary Power port on the back of the NetRS receiver At this time do not connect the power adapter to the multi port adapter This will be done in step e c Connect the GPS antenna cable to the GPS port on the back panel as in Figure 6 Figure 6 Back Panel Antenna and Power Connection d In MS Windows use Hype
4. Engineers either at 425 883 8700 or send a description of your problem including the serial number of your instrument via e mail to support paroscientific com 2003 Paroscientific Inc 15
5. IP address subnet mask and the gateway address Once these parameters are entered the receiver will ask you to confirm the parameters as in Figure 8 Hyper Tenminal Bie Edit yew Cel Dese Hels Dae os D g T iRLRiRLELELLLLLLLLLL LULL LGR ia LiAiRiLIRiRGRARiMGRLRiLLELLiRLELLiRLELLLLLL ULL LG ibiaRidinihininahidil Current EtherNet Port Configuration MAC address 00 60 35 00 03 32 Mode dhep IP 0 0 0 0 Hetmask A h B h a a i Gateway 8 0 0 8 Do pin viu want to change Ethernet Configuration yes no nol New Mode static dhe p New Mode static dhep statise7H New static IP Address 0 0 81 192 168 168 5 New Gateway Address 0 0 0 0 192 168 100 100 New Netmask 255 255 255 801 1355 299 200 8 Configuration static IP 192 168 100 5 192 168 100 100 Netmask 200 200 209 0 Accept New Configuration yes no yes yes_ Auto detect L150 Ai i Figure 8 NetRS Ethernet Interface Configuration 2003 Paroscientific Inc 9 Paroscientific Inc Technical Note Precision Pressure Instrumentation Doc No G8036 Rev NC 25 November 2003 g If your operating system is not MS Windows you can use any terminal program that can access your COM ports to configure the GPS receiver and the Ethernet interface h After the GPS receiver completes initialization connect the Ethernet cable that came with your GPS receiver to the Ethernet Connection port on side B of the multiport connector as seen in Hgure 4
6. Paroscientific Inc Technical Note Precision Pressure Instrumentation Doc No G8036 Rev NC 25 November 2003 Integrating Digiquartz METS3 and MET3A Broadband Meteorological Systems with a Trimble NetRS GPS Receiver Paroscientific Inc 4500 148 Ave N E Redmond WA 98052 USA Tel 425 883 8700 Fax 425 867 5407 www paroscientific com Technology support paroscientific com The standard by which other standards are measured 2003 Paroscientific Inc Paroscientific Inc Technical Note Precision Pressure Instrumentation Doc No G8036 Rev NC 25 November 2003 Integrating Digiquartz METS3 and MET3A Broadband Meteorological Systems with a Trimble NetRS GPS Receiver By Mustafa Yilmaz support paroscientific com 1 Introduction Paroscientific s MET3 and MET3A Broadband Meteorological Measurement Systems were specifically designed for GPS Meteorology and geophysical applications For both of these applications it 1s necessary to calculate the amount of precipitable water vapor PWV in the atmosphere for very accurate position measurements or short term weather forecasts nowcasting For these applications precision accuracy reliability and long term stability of the MET stations correspond to low total cost of ownership in the long run The broadband feature of these instruments also enables scientists to measure other atmospheric and geophysical signals with a network of GPS receivers co located wit
7. and Figure 6 Connect the other end of the Ethernet cable to a hub or switch in your network i At this point you should be able to access the Trimble NetRS receiver over the Ethernet network via a web browser Launch your web browser and in the address line type the IP address of your GPS receiver For this technical note we will use http 192 168 100 5 Once you launch your browser you will see the GPS receiver home page in Figure 9 a Trimble Wetkhs RS Microsoft Internet Explor ef ja ia EJ A E S ri LL KS SN99999090004 Receiver Status Identity System Name RS Senal Number 9999990004 Ethernet IP 192 168 100 3 DNS resolved name Unknown host Froware Version 1 0 1 06 Oct 2003 Set System Name 2003 Trimble Navigation Limited All rights reserved Trimble is a trademark of Trimble Navigation Limited registered in the United States Patent and Trademark Office The Globe amp Triangle logo is a trademark of Trimble Navigation Lamted All other trademarks are the property of them respective owners Figure 9 GPS Receiver Home Page j You are now ready to connect the MET station to the GPS receiver and configure the GPS receiver to log data from the MET station k As mentioned before as opposed to some other GPS receivers e g Thales Trimble NetRS does not provide power to the MET station You need the power breakout supply kit available from Paroscientific See Table 2 Connect the MET cable to the power breako
8. ation 2 Port Summary o Port Configuration o Reference Station Firmware to Browser Serial Port 2 Serial Port 4 TCP Port 8080 TCP Port 100 Trimcom F TCP Pon 9000 New Create NetRS RS 5N99999090004 PPP RT17 RIIT New Port Setups TCP Port UDP Port Figure 12 Trimble NetRS Serial Port Configuration n Inthe I O Configuration page click on the Serial Port 2 link This opens the Port Configuration window In this window click on the Met Tilt option This will bring up the window in Figure 13 o Set Baud to 9600 Parity and Flow Control to None At the bottom of the screen in the first Command box enter O100P9 r n If you set the ID of your MET station to a value other than 01 make sure to change that in the command string as well Trimble Weths Hs Micros ft Internet Eoplorer S gt Trimble Receiver States Satellites Data Logging Roceiver Configuration 0 Port Configuration 0 Reference Station Security Firmware In Browser Alala NetRS KS SN9999990004 Port Configuration SerialPot2 w Service OPPP E Met Tit OCMR ORTI ORTCM None Baud 3600 Parity Even Odd Paremeters for Mot TM moder _ a PIDPA Control Figure 13 Trimble NetRS MET Port Configuration 2003 Paroscientific Inc 12 Paroscientific Inc Technical Note Precision Pressure Instrumentation Doc No G8036 Rev NC 2
9. d Application engineers to get the power breakout supply kit Part Number 1727 00X X 1 for 110 VAC for 220 VAC X 2 You may order this kit during your purchase of the MET station as well Note MET stations shipped after 8 02 have Power amp Status LEDs which indicate the instrument is powered up and or transmitting receiving data b The MET station must be set to transmit pressure data in units of bar UN 3 MET stations have 8 user selectable pressure units available However MET stations will only respond to commands sent from a GPS receiver when the pressure unit is set to bar Broadband MET3 and MET3A Meteorological Measurement Systems pressure units are preset to bar by the factory before shipment This corresponds to UN parameter set to 3 in the configuration If your instrument is set to a different pressure unit you can use the Digiquartz Interactive DQI software provided with the MET station to change the pressure unit as illustrated in Figure 1 To download the most recent version of the DQI software please visit our web site at http www parosceintific com software htm fii Digiquartz Interactive Ver 1 2 ER File Communication Measure Help Configuration Calibration System Mets Temini Instrument ID fi Instrument Information Auto Stat Serial Number SM E9856 ETJ Number Transmission Background Mode Units Baud Fate BR 9600 peda AE p Unit LIN Parity PT O
10. e used The power breakout must be connected to the PC s serial port and plugged into the MET station RS 232 cable If your MET station has LEDs you should see the red power light ON The power for the MET unit is 7 to 16 VDC Download our setup and configuration software Digiquartz Interactive DQI from www paroscientific com software htmor load it from the Digiquartz CD Library that was shipped to you with the purchase of your MET station Figure 16 MET to PC Connection 2003 Paroscientific Inc 14 Paroscientific Inc Technical Note Precision Pressure Instrumentation Doc No G8036 Rev NC 25 November 2003 c Start the DQI program Select the Communication Port to which the MET station is connected and press Start The communication baud rate of the unit has been pre set to 9600 baud 8 data bits and 1 stop bit DQI will try to communicate with an Intelligent Instrument on the selected Communication Port by using a succession of baud rates The screen will display a baud rate and instrument identification numbers upon successful communication d If your instrument is powered up see the LED and DQI cannot detect your MET station there is either a problem with the interface cable or the MET station Please make sure to use the original MET station cable and power breakout Part Number 1727 O0X X 1 for 110 VAC X 2 for 220VAC supplied by Paroscientific If the problem continues and you are sure you are not having a cabl
11. evices such as GPS and DGPS receivers It defines electrical signal requirements data transmission protocol timing and specific sentence formats 2003 Paroscientific Inc 5 Paroscientific Inc Technical Note Precision Pressure Instrumentation Doc No G8036 Rev NC 25 November 2003 5 Getting Acquainted with the Trimble NetRS GPS Receiver The Trimble NetRS receiver is a dual frequency GPS receiver which runs on a Linux operating system and communicates through local and wide area networks All operating controls ports and connectors on the NetRS are either on the front or back panel Figure 2 shows the front panel LEDs service port Port 1 and the power button Service Port Ethernet Data Logging Secondary Power PATE BAAL FHTANENEY iD service Satellite Tracking Primary Power Power Rutton Figure 2 Trimble NetRS GPS Receiver Front Panel Service Port Port 1 is used for initial configuration IP address assignment and servicing the unit The default parameters for the RS 232 communication are 115 200 baud rate 8 data bits No parity and 1 stop bit Linux diagnostics messages are also available through this port during boot and shutdown processes Power button is used to control the GPS receiver s power states LED status is summarized in the table below External Frequency Shows if there is an external frequency source network traffic tracking fewer than four satellites If more flashes faster Logging Fla
12. h Digiquartz MET3 and MET3A Meteorological Measurement Systems The purpose of this document is to provide specific integration and diagnostics information additional to the MET3 and MET3A User s Manual to facilitate the integration of a MET station with a Trimble NetRS GPS receiver Once the MET stations are set up properly in the field these instruments are designed to work under rugged environmental conditions for years without problems The operating principle of a MET station with a GPS receiver is simple and relies on a few critical parameters This technical paper elaborates on these critical parameters and provides a technical recipe to integrate a Trimble NetRS GPS receiver with a MET station Since surface pressure and temperature measurements are vital parameters for PWV calculations the data reliability and integrity from the MET stations are of paramount importance 2 MET3 amp METS3A Broadband Meteorological Systems Performance Summary The MET3 and MET3A precision measurement instruments provide high accuracy data from barometric pressure temperature and relative humidity sensors Pressure resolution is better than 1 mcrobar with a total accuracy of 0 08 hPa over the extended barometric range of 620 to 1100 hPa Temperature resolution is 0 01 degree C The fan aspirated MET3A has a total temperature accuracy of 0 1 degree C over the operating temperature range of 50 to 60 degrees C Relative humidity performance is bette
13. ing problem please contact us at 425 883 8700 or at support paroscientific com e If DQI detects your instrument click on the OK button You should now see the DQI Configuration screen On this screen click on the Start button to read the configuration parameters of your MET station Check the Pressure Unit UN parameter Make sure that it is set to bar factory default If it is not in bar click on the pressure unit field and select bar then click on the OK button Make sure that the pressure unit field is changed to bar on the screen f On the top menu bar click on Measure and select MET3 from the drop down list The MET measurement panel will appear on the screen Each measurement parameter has its own window Verify that the pressure temperature and humidity fields have a reasonable data value If any field displays characters there may an instrument problem Try increasing the time out value on this screen to see if it will solve the problem If t does not contact our support department The DQI Help file also has troubleshooting suggestions g In early 2002 a status indicator panel LEDs was added to the MET stations These status indicators allow you to determine whether input power is supplied to the unit and to monitor RS 232 serial activity The status indicator panel is located on the bottom surface of the unit adjacent to the electrical connector The following
14. o send a P9 command to the MET station The MET station returns the pressure temperature and humidity in standard NMEA l format Two digit address of the MET Station 00P9 lt cr gt lt lf gt In this format Two digit address of the MET Station corresponds to the address of your MET station By default itis 01 If you changed this address please use the correct address in the format above If you did not change the address of the MET station 0100P9 lt cr gt lt If gt command should be issued by the GPS receiver to get a response from the MET station The lt cr gt and lt lf gt correspond to carriage return Character 13 and line feed Character 11 The MET station P9 command only works with a single device It will not work in an RS 232 loop A typical response to a P9 command is as below WIXDR P lt Pres Value gt B lt SN gt C lt Temp value gt C lt SN gt H lt Hum value gt P lt SN gt lt CR gt lt LF gt Pressure Temperature Humidity Transducer Field Units Pressure P B Bar Temperature C C Celsius Humidity H P Percent lt SN gt Transducer Serial Number Typically DQ This response will be parsed out and stored in your GPS receiver The NMEA 0183 National Marine Electronics Association Standard for Interfacing Marine Electronics Devices is a voluntary industry standard first released in March of 1983 The NMEA has become a standard protocol for interfacing navigational d
15. r than 2 at 25 degrees C and humidity recovery time for the MET3A after 100 water saturation is less than 2 minutes These fully integrated systems are housed in environmental enclosures allowing stand alone indoor or outdoor mounting Installation hardware and software are included and optional interface cabling is available for easy system integration The MET3 radiation shield protects the temperature and humidity sensors from precipitation and solar radiation The MET3A utilizes a high performance tuned barometric pressure port to reduce dynamic pressure errors caused by wind Microprocessor based electronics provide fully temperature compensated and linearized outputs via a two way RS 232 interface The serial interface allows complete remote configuration and control of all operating parameters including resolution sample rates choice of engineering units integration time and sampling commands Individual measurement parameters or a unified data word with all sensor outputs are easily interfaced with computer systems GPS receivers and data loggers 2003 Paroscientific Inc 2 Paroscientific Inc Technical Note Precision Pressure Instrumentation Doc No G8036 Rev NC 25 November 2003 3 What do you need for GPS MET Integration Purchase of Trimble NetRS and a Broadband Digiquartz MET3 or MET3A Meteorological package should include the following items from each vendor If any of these items are missing from your package
16. rTerminal to configure a session to access the Trimble GPS receiver via the RS 232 port to which NetRS is connected The HyperTerminal program is located in the Accessories and Communication menus Configure the HyperTerminal session as shown in Figure 7 Select the COM Port to which the GPS receiver is connected By default GPS receiver has 115200 baud rate 8 data bits No parity and flow control OFF Click on the OK button 2003 Paroscientific Inc g Paroscientific Inc Technical Note Precision Pressure Instrumentation Doc No G8036 Rev NC 25 November 2003 Trimble peciar os E COM1 Properties Port Settings Bits per second 1 15200 Data bits 2 Panty None Stop bits i Flow control om Auto detect Auto detect Figure 7 MS Windows HyperTerminal Configuration e When the HyperTerminal status bar shows Connected Connect the power adapter to the power connection port on side B of the multiport adapter as seen in Figure 6 The GPS receiver s operating system will start booting and sending messages to the HyperTerminal window Follow the messages on the screen f When the message from the GPS receiver asks do you want to change Ethernet Configuration Yes No type Yes and press the enter key This will give you an opportunity to enter the new network parameters Please talk to your network adminstrator or Internet Service Provider to get an
17. shes slowly when logging data Amber Power On when power source is healthy but not in use Flashing quickly when power source is low but in use On when power source is healthy 12 V or more Flashing when power source 1s low Table 3 Trimble NetRS LED Functions To review the details of the LED status codes please review the NetRS GPS Receiver User Guide from Trimble Figure 3 shows the Trimble NetRS back panel and connectors A brief description of each back panel item is as below Antenna port connects to the GPS antenna Multi port adapter portis used to provide power and Ethernet connectivity 10BaseT to the instrument Side A of this cable is connected to the port labeled Primary Power Side B of the cable is connected to an Ethernet cable and power adapter Please pay special attention to the type of cable used to connect the GPS receiver to different Ethernet devices straight through vs crossover cables Use a straight through cable when connecting to a hub ora 2003 Paroscientific Inc 6 Paroscientific Inc Technical Note Precision Pressure Instrumentation Doc No G8036 Rev NC 25 November 2003 switch Use a crossover cable when connecting directly to a computer Ethernet card Multi port adapter cable details are as illustrated in Figure 4 Mult port adapter 1PPS Output BNC Antenna N Primary power Ethernet DE26 F Port 3 DEQ F External Dari Secondar Port 2 DES M Port 4 DES M Y BN
18. table explains the function of the status indicators Indicator color Function ON Input power on OFF Input power off FLICKERING Activity on RS 232 receive line OFF No activity on RS 232 receive line FLICKERING Activity on RS 232 transmit line Yellow OFF No activity on RS 232 transmit line Table 4 MET LED Status h The RS 232 interface is capable of driving signals over distances of up to 30 meters with good quality shielded cable It is recommended that you bench test your unit with the installation cable especially if you are driving the signal a long distance i If your MET station seems to be operating properly and you can not make the GPS receiver communicate with the MET station this means there is either a problem with the connection between the GPS receiver and MET station or a configuration problem with the GPS receiver j Please make sure that when the GPS receiver cable is connected to the RS 232 cable of the MET station the Power LED on the MET station must be ON k If you still can t log data make sure that the logging feature is on and enabled Review the steps in section 5 of this document l If you still cannot log data from the GPS receiver and your MET station has passed the stand alone communication test explained in steps 1 6 of this section please contact Trimble technical support m If you are still having problems with the MET station please contact Paroscientific s Application Support
19. ut adapter and connect and secure the adapter to Port 2 or Port 4 on the back panel of the GPS receiver as shown in Figure 10 When you connect the MET cable to the power adapter and supply power the MET station power LED red should turn on as in Figure 11 The MET station connection to the power breakout adapter and the GPS receiver will be the same as the PC connection as in Figure 16 except the connection will be made to the NetRS instead of a PC l At this point the MET station is ready to respond It is now time to configure the GPS receiver to interrogate the MET station periodically 2003 Paroscientific Inc 10 Paroscientific Inc Technical Note Precision Pressure Instrumentation Doc No G8036 Rev NC 25 November 2003 GPS Antenna MET Station Connection hernet Cable Hower Cable Figure 11 MET Station LEDs Power ON m In the GPS receiver home page click on the I O Configuration menu option to the left of the screen You will be presented with different port options as in Figure 12 Select the COM port that the MET station is connected to We will use Port 2 in this technical note 2003 Paroscientific Inc 11 Paroscientific Inc Precision Pressure Instrumentation Technical Note Doc No G8036 Rev NC 25 November 2003 2 Trimble HetRS BS Microsoft Internet Explorer gt Trimble Receiver Status Input Output Summary Satelites Data Logging Receiver Configuration Internet VO Configur
20. verpressure Taring Ee Zero Set 25 Po saa oF Software Version Display Ott Distance DE Ea Beep EF Ea ee Decimals DP Resolution 4 0001 GH EISS 16 Bit Output E Pese PR 00238 Ee o 0001BL 0 imit Low LL Temperature TR 00952 o001MD 0 Limit High LH 0001 PR 00238 Int Mode IM Analog AR 0001 TR 00952 OOO AR 1 Inhibit Cort IC aie P EA aao l aar ooodon Command 0100 Figure 1 MET Station pressure unit must be set to UN 3 bar 2003 Paroscientific Inc 4 Paroscientific Inc Technical Note Precision Pressure Instrumentation Doc No G8036 Rev NC 25 November 2003 c Correct cable type between the GPS receiver and MET station must be used Paroscientific provides optionally available GPS to MET interface cables This cable connects the MET station directly to the GPS or to another GPS interface cable provided by the GPS receiver manufacturer If you are using a custommade cable or don t have the right GPS cable to interface with the MET cable you may experience communication problems If you are using a custom made MET cable please check the MET3 and MET3A User s Manual to see the pin connections d The GPS receiver must be configured to send a P9 command to the MET station Once the GPS receiver and MET station are connected and powered up the MET station is ready to respond to a P9 command issued from the GPS receiver The GPS receiver must be configured t
21. ves a command from NetRS the RX LED will blink TX LED will blink when it transmits data s Unless NetRS logging session is disabled it continuously logs position and MET data You can access these files download them or delete them via your web browser from the Data Files submenu under the Data Logging menu To access the active file you must disable datalogging first t For FTP access to the NetRS unit and downloading and converting the data files to RINEX format please see the instructions in NetRS User Manual 2003 Paroscientific Inc 13 Paroscientific Inc Technical Note Precision Pressure Instrumentation Doc No G8036 Rev NC 25 November 2003 W Trimble MetRS RS Microsoft Internet Explores fa fe a Co Tr ae bi NetRS Ss rim e RS etRS Logged Data Files 7 Logging Space 26 190 Mbytes Used 146 824 Mbytes Avadable Threctory path 1 subdirectory and 0 files Name Mociibed a FOOSE I 20 07 2003 do 28 Figure 15 NetRS Data Flies Access 6 Troubleshooting The MET Station Before integrating your GPS and MET station or in the event of communication loss between a GPS receiver and a MET station the MET station should be tested separate from the GPS receiver To perform this test please follow these steps a Connect the MET station to a laptop computer via the MET station interface cable and the power breakout as in Figure 16 Since PC s are not equipped to power up a MET station a power breakout must b
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