FT Technologies acures FT742-SM User manual

1 FT742-SM (RS422 & RS485) Sensors –User Manual
FT TECHNOLOGIES LTD.
SUNBURY HOUSE
BROOKLANDS CLOSE
SUNBURY-ON-THAMES
MIDDLESEX TW16 7DX
TEL: [phone]
FAX: [phone]
WEB: www.fttechnologies.com
E-MAIL: [e-mail]
A4281-2-EN
August 2017
The FT and Acu-Res logos are registered trademarks of FT Technologies Ltd.
Copyright © 2017 FT Technologies Ltd. All rights reserved.
FT742-SM –Digital Wind Sensor User Manual
Surface-Mounted - Digital RS422 & RS485 options

2 FT742-SM (RS422 & RS485) Sensors –User Manual
Contents
Product Symbols....................................................................................................... 4
Safety Instructions .................................................................................................... 5
Consignes de sécurité.............................................................................................. 6
1INTRODUCTION.................................................................................................. 7
1.1 Product Overview .............................................................................................................7
1.2 Build Versions and Labelling...........................................................................................7
1.3 Scope of Use.....................................................................................................................7
1.4 Disclaimer .........................................................................................................................8
2FUNCTIONAL DESCRIPTION ............................................................................9
2.1 Technical Performance.....................................................................................................9
2.2 Wind Speed Calibration..................................................................................................10
2.3 Wind Speed and Direction Filtering...............................................................................10
2.4 Electronically Offsetting the Wind Direction Datum.....................................................11
2.5 Compass & Declination Angle Operation......................................................................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
3MECHANICAL & ELECTRICAL INSTALLATION ............................................13
3.1 FT742-SM Sensors..........................................................................................................13
3.1.1 Mechanical & Electrical Integration...............................................................................13
3.1.2 Connector Details.........................................................................................................16
3.1.3 Lightning, Surge & EMI Protection................................................................................16
4SERVICE, CONFIGURATION & TESTING....................................................... 17
4.1 Inspection........................................................................................................................17
4.2 Fault Finding & Troubleshooting...................................................................................18
4.3 Returns............................................................................................................................18
5Evaluation .........................................................................................................19
5.1 Evaluation Pack ..............................................................................................................19
5.2 Acu-Test Software ..........................................................................................................19
5.3 FT058 & FT059 Evaluation Cables.................................................................................20
5.4 Software Installation.......................................................................................................21
6SENSOR COMMUNICATION............................................................................22

3 FT742-SM (RS422 & RS485) Sensors –User Manual
6.1 Introduction.....................................................................................................................22
6.2 RS422 & RS485 Protocol................................................................................................22
6.3 Configuring the Sensor ..................................................................................................25
6.4 Communication...............................................................................................................25
6.4.1 Conventions used in this manual ..................................................................................25
6.4.2 Data Transmission........................................................................................................26
6.4.3 Message Format...........................................................................................................26
6.4.4 Listener and Talker Identifiers.......................................................................................27
6.4.5 Calculating the Message Checksum.............................................................................27
6.4.6 Disabling the Checksum ...............................................................................................27
7PARAMETER SETTINGS.................................................................................. 29
7.1 Command Types.............................................................................................................29
7.1.1 Set Commands.............................................................................................................29
7.1.2 Query Commands.........................................................................................................30
7.2 User Calibration Table....................................................................................................31
7.3 Timing Constraints .........................................................................................................32
7.4 Command Parameters....................................................................................................33
7.4.1 BR: Set or Query the Serial Interface Baud Rate ..........................................................33
7.4.2 CF: Set or Query the Wind Compass Settings ..............................................................34
7.4.3 CU: Set or Query the Continuous Update Setting .........................................................36
7.4.4 DF: Set or Query the Wind Velocity Data Format..........................................................37
7.4.5 DG: Query the Run-time Counter..................................................................................38
7.4.6 DL: Set or Query the Command Delay Interval.............................................................39
7.4.7 ER: Query or Reset the Error Report ............................................................................40
7.4.8 FL.1: General Filter Settings.........................................................................................41
7.4.9 FL.2: Set or Query Filter Lengths..................................................................................42
7.4.10 FL.3: Set or Query the Selective Filter......................................................................43
7.4.11 HT.1: General Heater Settings.................................................................................44
7.4.12 HT.2: Delay Heater Settings....................................................................................45
7.4.13 ID: Set or Query the Listener & Talker Identifiers......................................................46
7.4.14 MM: Reset or Query the Min/Max Recorded Wind Speed.........................................47
7.4.15 OS: Overspeed Warning Scheme............................................................................48
7.4.16 PR: Query the Parameter Report..............................................................................49
7.4.17 RS: Reset the Sensor...............................................................................................50
7.4.18 SN: Query the Serial Number and Platform Version .................................................51
7.4.19 SV: Query the Software Version...............................................................................52
7.4.20 UC.1: General User Calibration Settings ..................................................................53
7.4.21 UC.2: Clear User Calibration Table Record ..............................................................54
7.4.22 UC.3: Set User Calibration Table Record .................................................................55
7.4.23 UC.4: Save and Read User Calibration Table...........................................................56
7.4.24 UC.5: Set & Query User Calibration Table Label ......................................................57
7.4.25 US: Set or Query Saved Parameters........................................................................58
7.4.26 WV Polar: Query the Wind Velocity Reading ............................................................60
7.4.27 WV NMEA: Query the Wind Velocity Reading ..........................................................61

4 FT742-SM (RS422 & RS485) Sensors –User Manual
Product Symbols
The following symbols may be used upon the product and within the manual.
Meaning / Description
Symbol
Signification / Description
Warning/ Caution
An appropriate safety instruction should be
followed or caution to a potential hazard
exists
Avertissement / Attention
Une instruction de sécurité doit être
suivie ou attention portée à un
danger potentiel qui existe.
DC Current only
Equipment operates under Direct Current
(DC) supply only.
Courant continu uniquement
L'équipement fonctionne sous une
alimentation en courant continu (CC)
uniquement.
Recognized Component
Sensors marked with the ETL label indicate
that the product conforms to UL Standard
61010-1 and is certified to CSA Standard
C22.2 No. 61010-1.
4000105
Composant Reconnu
Les capteurs marqués avec
l’étiquette ETL indiquent que le
produit est conforme à la norme UL
61010-01 et est certifié à la norme
CSA22.2 61010-01.
Product 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 Technologies or by using an appropriate
waste disposal company. This product
should not be disposed of in general waste
of landfill. This product complies with the
RoHS2 (2011/65/EU) directive.
Élimination du produit
Conformément à la directive
européenne 2012/19/EU relative aux
déchets d'équipements électriques et
électroniques (DEEE), ces
composants du produit doivent être
recyclés. Cela doit être fait par le
retour du produit à FT Technologies
ou en utilisant une entreprise
d'élimination de déchets. Ce produit
ne doit pas être éliminé avec les
ordures ménagères ou en décharge.
Ce produit est conforme à la
directive RoHS2 (2011/65/EU).
CE Mark
The EU Declaration of Conformity
complies with the essential requirements
of the following applicable EMC Directive
2014/30/EU, and carries the CE Marking
accordingly.
Marquage CE
Déclaration de conformité CE de la
compatibilité électromagnétique
(EMC) et marquage CE
conformément à la directive CE
2014/30/EU.

5 FT742-SM (RS422 & RS485) Sensors –User Manual
Safety Instructions
English
To ensure the safe installation and operation of this product the equipment must be installed and
integrated:
oUsing suitably qualified and trained personnel
oIn accordance with any regional electrical codes
oIn accordance with the instructions set out in this manual, observing all information, warnings
and instructions
oIn accordance with any other instructions or guidance FT Technologies provide
To ensure that the product remains compliant with the electrical safety requirements of the UL / CSA
61010-1 Standards it must be;
oConnected to an appropriately approved isolated power supply (for example UL/CSA IEC
60950-1:2005 + A1:2009 + A2:2013) rated 6-30VDC and be current limited (2.5A Maximum)
oProtected by UL 1449 listed surge protection devices
oConnected with an approved interface cable (for example UL/ CSA recognised AWM style
21198, rated 300V, 80°C)
The equipment must only be operated within the range of the specified technical data and used for the
purposes for which it was designed.
The equipment should always be transported in packaging which is appropriate, that will prevent any
accidental damage from occurring.
Always ensure that any failures or errors from the product cannot cause any damage to any other
equipment or property or cause any other consequential effects.

6 FT742-SM (RS422 & RS485) Sensors –User Manual
Consignes de sécurité
Français
Pour assurer la sécurité de l'installation et le fonctionnement de ce produit, l'équipement doit être
installé et intégré :
oÀ l'aide de personnel qualifié et formé
oConformément à tous les codes électriques régionaux
oConformément aux instructions figurant dans ce manuel et en observant toutes les
informations, avertissements et instructions
oConformément à d'autres instructions ou directives que FT Technologies fournit
Pour garantir que le produit reste compatible avec les exigences de sécurité électrique de l'UL/CSA
61010-1 normes, l'équipement doit être :
oConnecté à une alimentation agrée convenablement isolée (par exemple UL/CSA IEC 60950-
1:2005 + A1:2009 + A2:2013) de tension nominale 6-30 VCC et avec courant limité (2.5 A
max)
oProtégé par des dispositifs de protection UL 1449 contre les surtensions
oConnecté avec un câble d'interface (par exemple UL/CSA reconnu AWM style 21198, de
valeur nominale 300 V, 80°C)
L'équipement doit être utilisé uniquement dans la plage des données techniques spécifiées et utilisé
aux fins pour lesquelles il a été conçu.
L'équipement doit toujours être transporté dans un emballage qui est approprié, qui permettra d'éviter
qu'un quelconque dommage accidentel ne survienne.
En toutes circonstances, garantir que les défaillances ou les erreurs du produit ne puissent pas causer
des dommages à d'autres équipements ou autres biens ou provoquer d'autres effets indirects.

Section 1 Introduction
7 FT742-SM (RS422 & RS485) Sensors –User Manual
1 INTRODUCTION
1.1 Product Overview
The FT742-SM is a solid-state ultrasonic wind sensor, using a patented Acoustic Resonance airflow
sensing technique to measure accurately both wind speed and direction. The sensors have been
specifically designed to operate in harsh environments including offshore and ice-prone areas. The
wind sensor has no moving parts to degrade or wear and is designed for applications requiring high
reliability. This helps reduce costly down-time and unscheduled maintenance visits.
Mounting and aligning the sensor is very simple. A wind datum feature mark can be used to align the
sensor to a reference point, while the integrated compass allows reference to magnetic North. For
operation in ice-prone areas, the FT742 is fitted with a thermostatically 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) communication outputs, this
communication setting is programmed at the factory and cannot be modified by the user.
1.2 Build Versions and Labelling
Figure 1 shows how to identify the sensor platform version and individual serial number, depending on
the attached main labels:
Additional labels may be attached.
Figure 1: Main Sensor Labels
1.3 Scope of Use
The sensor is designed, manufactured and optimised for high availability.
No promise in part or full can be given to guarantee a sensor’s continuous operation, as exceptional
circumstances can occur that may result in the failure of the output from a sensor. Exceptional
circumstances can include:
Poor installation
Inadequate inspection
Power supply failures
Poor quality electrical connections
Lightning exposure
Problematic environmental conditions or combination of conditions
Physical Damage

Section 1 Introduction
8 FT742-SM (RS422 & RS485) Sensors –User Manual
Typically higher levels of wind speed and wind direction data availability are achieved through the use
of an additional FT sensor or alternative sensor. Control strategies or algorithms, which compensate in
whole or in part, for any temporary interruption of data from individual sensors should also be applied.
The choice and implementation of such methods is entirely the Purchaser’s responsibility.
1.4 Disclaimer
There are no warranties, representations or conditions, expressed or implied of any kind given in this
manual for any particular design application. The Purchaser should 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 warranty given by FT Technologies in respect of the Equipment is conditional upon the sensor
being handled, installed, integrated and operated in accordance within the guidelines given in this
manual.
FT Technologies can take no responsibility for the effectiveness of any sensor lightning protection
scheme implemented. The wind sensor has passed a wide range of EMC tests but FT Technologies
does not warrant the sensor to survive lightning strikes.
Information supplied by FT Technologies Ltd. shall not be construed as permission to license to operate
under, or recommendation to infringe any existing or pending patent, patent applications or trademarks.

Section 2 Functional Description
9 FT742-SM (RS422 & RS485) Sensors –User Manual
2 FUNCTIONAL DESCRIPTION
2.1 Technical Performance
Sensor Performance1 & 2
Measurement Principle Acoustic Resonance (compensated against variations in temperature,
pressure and humidity)
Wind Speed Measurement
Range 0-75m/s
Resolution 0.1m/s
Accuracy ±0.3m/s (0-16m/s)
±2% (16m/s-40m/s)
±4% (40m/s-75m/s)
Wind Direction Measurement
Range 0 to 360°
Sensor Accuracy 4RMS
Compass Accuracy 5RMS
Resolution 1
Environment
Temperature Range -40 to +85C (operating and storage)
Humidity 0-100%
Altitude 0-4000m
Data I/O
Interface RS422 (full-duplex) or RS485 (half-duplex). The communications
interface option is programmed at the factory.
Format ASCII, polled or Continuous Update modes (CU on RS422 only)
Data Update Rate Up to 10 measurements per second (10Hz)
Power Requirements3, 4 & 5
Supply Voltage 24VDC nominal (6-30VDC range). A minimum of 9VDC is required
for heater operation
Sensor Current (Heater off) 25mA nominal (29mA with compass enabled)
Heater Current (Heater on)6 Up to 2A + nominal
Physical
Weight 252g
Material Aluminium alloy (external body hard anodised)
I/O Connector 8-way M12 connector
Mounting Method Surface-Mount with compressed O-ring/screw fit
Notes:
1.All specifications subject to change without notice.
2.Specifications calculated with the default settings and filters enabled.
3.See safety instruction requirements (page 5 and 6).
4.The heater set-point temperature can be configured by the user. Modifications to the heater current
limit and under-voltage limit are not permitted on the FT742-SM range, for further details contact FT
Technologies.
5.The current draw from the heater will depend on the environmental cooling and the temperature
setpoint. The sensor is limited to 2A4 nominal by default. The maximum power is 60W (30V & 2A).
6.A suitable PSU capable of providing up to 2.5A maximum is recommended.

Section 2 Functional Description
10 FT742-SM (RS422 & RS485) Sensors –User Manual
2.2 Wind Speed Calibration
The wind sensor is calibrated in our wind tunnels before dispatch. As the sensor has no moving parts, there is
no need to recalibrate a sensor over its lifetime as no measurement degradation will occur. The sensor’s
compact strong monolithic shape is designed to prevent accidental transducer movement or damage. FT
Technologies’calibration procedure and wind tunnels are designed to give a calibration profile that is within the
accuracy limits set in the product technical specification (see Section 2.1). Periodically the accuracy of FT’s
wind tunnels are compared with the accuracy of an independent wind tunnel to ensure that no drift has
occurred.
In exceptional circumstances users may wish to apply additional calibration factors. The sensors have an option
to set a User Calibration Table, which can modify the wind sensor’s wind speed output (see Section 7.4.20).
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 speed output is adjusted according to the stored User
Calibration Table records using linear interpolation. The adjustments are applied to wind speed readings
regardless of wind direction.
2.3 Wind Speed and Direction Filtering
It is important that the system does not rely exclusively on a single wind reading for any control decision. A
single reading may be inaccurate due to measurement error, turbulence, corruption or interference. It is
recommended that an average of wind readings is used. In addition if 100% data availability is required then a
second FT sensor or alternative wind sensors should be fitted in addition.
The sensor has optional internal filtering available. This is a digital finite impulse response (FIR) filter, which
works by calculating the moving average of a fixed number of previous readings. If filtering is being applied
externally, the sensor’s output filters can be disabled. If filtering inside the sensor is preferred, the length of the
averaging for both wind speed and direction can be independently set (See Sections 7.4.8 and 7.4.9).
Figure 2: Examples of FIR Filtering
It is recommended to use average readings to reduce the effects of air turbulence.