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Section 3

 Mechanical & Electrical Installation

 

 

          15 

 

 

                              FT742-SM (RS422 & RS485) Sensors 

– User Manual

 

 

             

 

 

Содержание FT742-D-SM

Страница 1: ...4 0 20 8943 0801 FAX 44 0 20 8943 3283 WEB www fttechnologies com E MAIL info fttechnologies com A4281 4 EN October 2021The FT and Acu Res logos are registered trademarks of FT Technologies Ltd Copyri...

Страница 2: ...11 2 5 1 Compass Calibration 11 2 6 Selective Filter Scheme 11 2 7 Error Detection 11 2 8 Overspeed Warning Scheme 12 2 9 Heater Setup 12 2 10 Low Power Operation 12 2 11 Acoustic Temperature 13 3 ME...

Страница 3: ...7 4 8 DF Set or Query the Wind Velocity Data Format 50 7 4 9 DG Query the Run time Counter 52 7 4 10 DL Set or Query the Command Delay Interval 53 7 4 11 ER Query or Reset the Error Report 54 7 4 12 F...

Страница 4: ...Disposal In accordance with European directive 2012 19 EU on Waste Electrical and Electronic Equipment WEEE these product components must be recycled This should be done by returning the product to FT...

Страница 5: ...ety requirements of the UL CSA 61010 1 Standards it must be o Connected to a regionally approved limited PSU rated 6 30VDC current limited 2 5A maximum o Protected by UL 1449 listed surge protection d...

Страница 6: ...ement doit tre o Connect une alimentation agr e r gionalement convenablement isol e de tension nominale 6 30 VCC et avec courant limit 2 5 A maximum o Prot g par des dispositifs de protection UL 1449...

Страница 7: ...controlled all body heating system A two element heater is used to ensure heat is evenly distributed over the entire surface area The FT742 SM allows either RS422 full duplex or RS485 half duplex comm...

Страница 8: ...independently undertake sufficient testing to confirm validity and suitability of any design The Purchaser assumes all risks and liability in conjunction with the use of the information given Any warr...

Страница 9: ...2 full duplex or RS485 half duplex The communications interface option is programmed at the factory Format ASCII polled or Continuous Update modes CU mode using RS485HD requires software V7 4 Data Upd...

Страница 10: ...ensor s wind speed output see Section 7 4 23 The User Calibration Table can be programmed with up to 64 correction factors which are maintained in non volatile memory When enabled the uncorrected wind...

Страница 11: ...signature of the host system change significantly because component parts have been added or removed then a recalibration may be required 2 5 1 Compass Calibration Compass calibration should be perfor...

Страница 12: ...in order to maintain the programmed set point temperature It is important to consider the resistive losses in the cable and rate the cable appropriately In general power losses in the cable should be...

Страница 13: ...operating specifications Operation with high temperature gradients between sensor body and ambient airflow extreme humidity levels and low wind conditions below 5m s may result in reduced accuracy Sof...

Страница 14: ...operation of the sensor This section is for guidance only It is the responsibility of the designer and installer to ensure that the installation and its design is fit for purpose Please see Disclaimer...

Страница 15: ...Section 3 Mechanical Electrical Installation 15 FT742 SM RS422 RS485 Sensors User Manual...

Страница 16: ...groove FT O ring part number FT029 manufacturer part number 2 127 O Ring EPDM 70 Shore One O ring is supplied with new sensors The use of lubricant on the O ring will depend on the material selection...

Страница 17: ...hat the cable is suitable for the environment it will be used in and is adequately rated and approved for example AWM Style 21198 In an area with a moderate or severe lightning strike exposure the cab...

Страница 18: ...more details on this or contact FT Technologies for more information Advanced surge and lightning protection typically requires a grounded lightning mast SPDs grounded metallic conduit and 360 termin...

Страница 19: ...ld be removed using an abrasive cloth Check that any fixings and O rings are in good condition with no signs of corrosion and tighten as necessary If corrosion is present replace with parts of the app...

Страница 20: ...on 4 3 Warning The sensor contains no user serviceable components Do not attempt disassembly as damage may result and product warranties will be invalidated During extreme weather conditions there may...

Страница 21: ...connections should be mated and operated in a dry and suitable working environment for electronics Figure 8 The FT062 Power Supply left Benchtop Electronic PSU Example right The Acu Test kit allows t...

Страница 22: ...le and attempt to update the FTDI drivers Wait for Windows to confirm the device is ready to use Please wait for Windows to install the hardware Ready for use Figure 10 Windows Driver Installation Seq...

Страница 23: ...detect the wind sensor as long as it is powered up and operating normally If the sensor is in Continuous Update mode it will disable it and provide an option at the end of the session to re enable it...

Страница 24: ...res software V7 5 and an FT temperature calibration Figure 13 Acu Vis 2 0 Live Display The program shows various configuration settings including the software version and serial number The heater stat...

Страница 25: ...r Wind Direction Datum Offset Apply a directional offset to the sensor Figure 14 Acu Vis 2 0 Settings Display The Sensor Warnings and History button will provide a history of the connected sensor sett...

Страница 26: ...ndow shows the command structure and allows the user to transmit commands using the Execute Command button If the command has a response it will be shown below Some SET commands require the user to ad...

Страница 27: ...cu Vis 2 0 will download any existing UCT settings and display them on the table and graph The easiest method of changing the UCT is to use the Standard Offset buttons to establish a calibration chang...

Страница 28: ...ure 17 Creating a Connection in TeraTerm Create a new Serial connection the COMx channel will be dynamically assigned by the user s computer but should typically be recognised as a USB Serial Port It...

Страница 29: ...onfirm it was accepted using a QUERY command This can be an issue when using CU mode at high frequencies Below are some useful commands 01 ID Query the sensor ID setting 01 CU Query the CU mode settin...

Страница 30: ...y a positive voltage on line A with respect to line B RS422 The idle marking logical 1 OFF or stop bit state is defined by a negative voltage on line A with respect to line B RS422 The active spacing...

Страница 31: ...ter makes use of a fail safe RS485 transceiver 4 Subject to testing one or both termination resistors may be omitted only if biasing is not needed and the transceivers are slew rate limited 5 Resistor...

Страница 32: ...es use of a fail safe RS422 transceiver 4 Subject to testing one or both termination resistors may be omitted only if biasing is not needed and the transceivers are slew rate limited 5 Resistors shoul...

Страница 33: ...ers e g cr for carriage return Figure 22 lists the various special characters and symbols which are used in the examples given in this Handbook Symbol Valid Characters HEX Values Definition a A to Z 0...

Страница 34: ...fields hh cr lf Message terminator 0D 0A HEX 2 chararcter checksum Checksum delimiter 2A HEX See text for details of valid commands and output data strings Field delimiter 2C HEX optional for host com...

Страница 35: ...Talker ID use the ID Command Section 7 4 17 6 4 5 Calculating the Message Checksum All messages sent to or received from the sensor include a checksum field Messages that are transmitted from the sens...

Страница 36: ...tomatically enabled 02DFP 50 cr lf Without a checksum sensor checksum validation automatically disabled 02DFP cr lf A checksum value is always transmitted by the sensor with every outgoing message How...

Страница 37: ...11 Wind velocity filter FL Enabled or Disabled Speed filter length Direction filter length Enabled 0016 0016 7 4 12 7 4 13 Selective Filter FL Enable or Disable Selective filter length Disabled 010 7...

Страница 38: ...runtime 7 4 9 Command delay interval DL 00 to 20 7 4 10 Error report ER Factory Report 7 4 11 Wind velocity filter FL Enabled or Disabled Speed filter length 1 64 Direction filter length 1 64 7 4 12 7...

Страница 39: ...Table with data the following steps need to be taken 1 The Table must first be cleared See Section 7 4 24 2 Each pair of table row values is entered into a RAM copy of the User Calibration Table See...

Страница 40: ...or a predefined delay before sending a response This delay time is programmable in increments of 50ms See Section 7 4 10 for details of how the delay between the sensor receiving a command and transmi...

Страница 41: ...orientation checksum cr lf aa AM x hh cr lf Parameters orientation N I Set Normal orientation for mounting the sensor in regular orientation Set Inverted orientation for mounting the sensor upside dow...

Страница 42: ...uery Temperature K Query the latest acoustic temperature reading Message Comment 01 AT cr lf Query acoustic temperature WI AT 297 2 K V 0C cr lf Sensor response Example 3 CU AT DFC Mode WI WVC 000 0 3...

Страница 43: ...Temperature is to be output in degrees Celsius F The Acoustic Temperature is to be output in degrees Fahrenheit K The Acoustic Temperature is to be output in Kelvin Examples Example 1 Set the Acoustic...

Страница 44: ...up to 50S then one minute increments from 01M to 10M Factory Default Setting 01M Examples Example 1 Set the filter time constant to 40 seconds Verify that the command has been accepted Message Comment...

Страница 45: ...aud Examples Example 1 Set the baud rate to 19200 baud verify the new setting and send a user reset command to activate the new baud rate Message Comment 01 BR1 cr lf Set baud rate to 19200 01 BR cr l...

Страница 46: ...y eastward declination angles are added to magnetic heading However since the declination angle on the FT742 SM is provided in the form 0 to 359 9 the user must write westerly declination in the form...

Страница 47: ...the results 01 CFC cr lf 01 CFE cr lf 01 CFMS cr lf Enable compass calibration Disable compass calibration Save compass calibration Description Use the CF command to access the compass related feature...

Страница 48: ...de 1Hz CU DFC Response 1Hz Description Use the CU command to enable or disable the continuous update mode of operation When continuous update is enabled the sensor will output wind velocity readings a...

Страница 49: ...SM RS422 RS485 Sensors User Manual WARNING Do not use the continuous update mode if there are other talkers connected to the data bus Only one active talker is allowed on the data bus at any one time...

Страница 50: ...e Examples Example 1 Set the wind velocity output data format to NMEA with wind speed in m s and verify the new setting Message Comment 01 DFN cr lf Set format to NMEA m s 01 DF cr lf Query format set...

Страница 51: ...ult values is automatically performed Polar Format The sensor returns the magnitude of the wind speed m s only and the wind direction 0 359 degrees NMEA 0183 Format The sensor returns the wind angle 0...

Страница 52: ...nter 000000 to 999999 Holds the number of hours that the anemometer has been in operation during its lifetime Examples Example 1 Query the Run Time Counter Message Comment 01 DG T cr lf Query Run Time...

Страница 53: ...erify the new setting Message Comment 01 DL05 cr lf Set delay to 250ms 01 DL cr lf Query delay setting WI DL 05 02 cr lf Sensor response Description Use the DL command to set the delay interval from w...

Страница 54: ...string is always comprised of 15 ASCII characters all shown as 0 ASCII 30 HEX in the above example The first character in the data field represents the current operational status of the sensor 0 ASCII...

Страница 55: ...r E Filter enabled Factory Default Setting D Filter disabled Examples Example 1 Enable the filter Verify that the command has been accepted Message Comment 01 FLE cr lf Enable filtering 01 FL cr lf Qu...

Страница 56: ...alent to disabling the filter Factory Default Setting 0016 Examples Example 3 Modify the filter s dimensions Verify that the command has been accepted Message Comment 01 FLL0001 0032 cr lf Set speed f...

Страница 57: ...lf Query the Selective Filter status WI FL E 005 hh cr lf Sensor reports it is enabled with a 5 reading 0 5 second filter Example 2 Enable or Disable the Selective Filter Status 01 FLSE010 cr lf Enabl...

Страница 58: ...the command has been accepted Message Comment 01 HT05 cr lf Set heater set point temp 01 HT cr lf Query heater setting WI HT 05 00 24 3B cr lf Sensor response Example 2 Turn off the sensor heater Veri...

Страница 59: ...004 to 999 Heater Delay in seconds This is the period after sensor power on before the heater will be enabled Factory Default is 004 4 seconds Examples Example 3 Set the sensor heater delay to 010 Ver...

Страница 60: ...r listener address identifier to A1 and the talker address identifier to B1 Verify that the command has been accepted Message Comment 01 IDA1B1 cr lf Set address ID s A1 ID cr lf Query ID settings B1...

Страница 61: ...eed to 999 9 and MaxSpeed to 000 0 until the first reading MinSpeed 000 0 to 999 9 Minimum detected wind speed in current unit m s knots or km h MaxSpeed 000 0 to 999 9 Maximum detected wind speed in...

Страница 62: ...isabled E Overspeed Warning Enabled Examples Example 1 Enable the Overspeed Warning scheme Verify that the command has been accepted Message Comment 01 OSE cr lf 01 OS cr lf WI OS E 56 cr lf Enable th...

Страница 63: ...ding the last parameter settings Message Comment 01 RSU cr lf Reset sensor reloading last settings Description Use the RS command to reset the sensor software The sensor will be ready to receive new c...

Страница 64: ...PlatformVersion 00 99 Platform version issue of the sensor design The 3 spaces after the 2 digit number are reserved for future use Examples Example 1 Read the sensor serial number and platform versi...

Страница 65: ...9 9 Software version of the sensor Examples Example 1 Read the software version number Message Comment 01 SV 17 cr lf Query software version WI SV 7 5 16 cr lf WI SV 7 5 1 19 cr lf Sensor response 7...

Страница 66: ...esponse Description Use the UC command to enable or disable the implementation of the user calibration table for calibrating wind speed readings The four digit user calibration table checksum is calcu...

Страница 67: ...Example 1 Erase the user calibration tables and verify Message Comment 01 UCCLEAR 62 cr lf Erase calibration tables 01 UC 04 cr lf Query user calibration table status WI UC 00 D 0000 0000 71 cr lf Sen...

Страница 68: ...ess than 0 5ms than previous record Error Data entry not allowed table has not been cleared first Error Bad argument data format not valid Error User calibration table is full all 64 rows have been en...

Страница 69: ...UCS 68 cr lf Save calibration table 01 UC 04 cr lf Query user calibration table status WI UC 55 E 5174 5174 70 cr lf Typical sensor response Example 2 Read calibration data stored in row 5 of the Flas...

Страница 70: ...label32 xxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxx 32 ASCII characters Note ASCII spaces will be added to entered ASCII string if it is less than 32 characters to form a string of 32 characters Examples Exampl...

Страница 71: ...cr lf Set saved parameters 01 US cr lf Query the saved parameters WI US F 4F cr lf Sensor response Description There are three copies of Parameters stored in Flash memory namely User Parameters Facto...

Страница 72: ...ser Parameters See command RSS Section 7 4 20 for the details of the RSS command After RSF and RSS commands are executed the restored parameters are loaded into RAM so it is imperative to execute any...

Страница 73: ...HEX If the sensor detects an error condition the status character will be set to 1 If the Overspeed Warning Scheme see Section 2 8 is enabled and if the sensor detects wind speed above the maximum ran...

Страница 74: ...returns the magnitude of the wind speed m s and the wind direction 0 359 NMEA 0183 Format The sensor returns the NMEA 0183 Wind Speed and Angle sentence MWV see WV NMEA Section 7 4 30 It is important...

Страница 75: ...rates the NMEA wind velocity data format The example shows the sensor output in m s with a wind speed of 20m s and a wind angle of 45 Message Comment 01 WV 13 cr lf Query the wind velocity WIMWV 045 R...

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