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Rev:     

1.00 

Date:

    11.22.2013 

Page:

   34 of  40

 

AIMMS-20 

OPERATING MANUAL 

 

Document-P/N: 

AIMMS20-OM 

 

© Aventech Research Inc. 2013. All Rights Reserved.

 

APPENDIX A: AIMMS-20 SERIAL COMMUNICATION FORMAT 

 

A.1 Introduction 

 

The AIMMS-20 offers bi-directional RS-232 communications using a binary packet 
format.  The default broadcast packet is called the Standard Meteorology Data Packet, 
which is output at a user-defined rate up to 20Hz.  An optional Aircraft-State Data 
Packet is also available, which includes aircraft position, velocity, attitude and aircraft-
relative flow (TAS) vector, each in three dimensions.  This packet is also available at a 
user-defined output rate.  For systems that include pneumatic purge-flow data feedback, 
a Purge Flow Data Packet is transmitted at the same rate as the aircraft-state packet, 
with flow-rate data refreshed internally at a rate of approximately 12Hz. 
 

A.2 Hardware Configuration 

 
The RS-232 serial interface utilizes only three lines: receive, transmit, and ground.  The 
default baud rate is 19200.  The system operates with no parity, 8 data bits, 1 stop bit. 
 

A.3 Packet Format 

 
Each packet consists of a four-byte header, a data block from 0 to 255 bytes in length, 
and a 16-bit checksum. 
 

Byte 

     Description 

 

1 

 

Start of header = 1 

2 

 

Packet ID: 0 for standard met. packet, 1 for aircraft-state packet 

3 

Bitwise complement of ID (255, 254 respectively) used to further validate 
packet frame-lock  

4 

 

Number of bytes in data block (N) 

5 

 

First byte of data block 

5+N   

16-bit unsigned checksum, least significant byte  

6+N   

16-bit unsigned checksum, most significant byte 

 

Note: The checksum includes the leading SOH character but not the two checksum-
bytes themselves. 
 

Содержание AIMMS-20

Страница 1: ... Aventech Research Inc 2013 All Rights Reserved AIMMS 20 Aircraft Integrated Meteorological Measurement System OPERATING MANUAL Document P N AIMMS20 OM Aventech Research Inc 110 Anne Street South Unit 23 Barrie Ontario Canada L4N 2E3 Tel 705 722 4288 Fax 705 722 9077 Web www aventech com ...

Страница 2: ...re Function 21 11 2013 Bruce H Woodcock DE Checked Date Name Signature Function 22 11 2013 Bruce H Woodcock DE Approved Date Name Signature Function 22 11 2013 Bruce H Woodcock HD Customer Approval as required Date Name Signature Function Table of Functions CUST Customer DE Design Engineer HD Head of Design Engineering PM Production Manager QM Quality Manager ...

Страница 3: ...ow Aventech Research Inc 110 Anne Street South Unit 23 Barrie Ontario Canada L4N 2E3 Tel 705 722 4288 Fax 705 722 9077 E mail support aventech com Shipping costs to Aventech Research Inc are the responsibility of the end customer FOB Destination Aventech Research Inc assumes no risk for damage in transit Following warranty repair the product will be returned to Buyer transportation prepaid FOB Des...

Страница 4: ...ation contained herein Should Aventech Research Inc and the user have a separate written agreement with warranty terms covering the material in this document that conflict with these terms the warranty terms in the separate agreement shall control THIS WARRANTY IS BUYER S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY IMPLIED WA...

Страница 5: ...MMS 20 OPERATING MANUAL Document P N AIMMS20 OM Aventech Research Inc 2013 All Rights Reserved RECORD OF REVISIONS Date Issue Page Paragraph Firmware Revision Comments 21 11 2013 1 00 All All Preliminary Draft 22 11 2013 1 00 All All Release ...

Страница 6: ...n of Laptop Computer 14 3 2 Measurements 14 3 3 Calibration Flight Procedure 15 3 3 1 Pre Flight Procedure 15 3 3 2 Aerodynamic Calibration Manoeuvres 15 3 3 3 Inertial System Calibration Manoeuvres 17 3 3 4 Post Flight Procedure 18 4 AIMMS CONFIGURATION UTILITY SOFTWARE USER S MANUAL aimcfg exe 19 4 1 Installing aimcfg 19 4 2 Starting aimcfg 19 4 3 Main Program Window 21 4 4 File Menu 21 4 4 1 Lo...

Страница 7: ...sional Wind 32 5 5 ELECTRICAL 32 5 6 ENVIRONMENTAL 33 5 7 WEIGHT 33 APPENDIX A AIMMS 20 SERIAL COMMUNICATION FORMAT 34 A 1 Introduction 34 A 2 Hardware Configuration 34 A 3 Packet Format 34 A 3 1 Data Block Standard Meteorology Packet ID 0 35 A 3 2 Data Block Aircraft State Data Packet ID 1 36 A 3 3 Data Block Purge Flow Packet ID 4 37 A 3 4 Data Block Internal Probe Temperature Packet ID 5 37 A 3...

Страница 8: ...document provides a step by step description on how to setup and calibrate the AIMMS 20 instrumentation for your aircraft or helicopter airframe Section 2 provides an overall description of the components of the AIMMS 20 system Section 3 provides detail on how to perform the initial setup of the system followed by a description of the flight manoeuvres that must be performed in order to calibrate ...

Страница 9: ...ment boom and a ring of static pressure ports slightly aft of the measurement boom nose Using this set of pressure ports measurement of the barometric pitot static differential angle of attack and differential side slip pressure measurements can be obtained which define the three dimensional flow vector OAT and RH measurements are made using a small 0 038 diameter bead thermistor and thermoset pol...

Страница 10: ...egree of freedom inertial measurement unit consisting of three MEMS accelerometers and three MEMS rate gyros Utilizing inexpensive MEMS based measurement devices provides a high accuracy low cost method of measuring the dynamic high frequency motion of an airborne platform However the compromise is that MEMS based measurement devices have poorer long term DC stability The AIMMS 20 system compensat...

Страница 11: ...orm can be determined using the GPS carrier phase measurements from the two GPS receivers located in the module Lateral antennae configurations are typically used on fixed wing aircraft while longitudinal antennae configurations can be utilized on fixed or rotary wing aircraft Although the attitude measurement performed using this technique is stable it possesses a fairly low frequency response 2 ...

Страница 12: ... attitude and velocity are transformed into the earth reference frame to provide the final three dimensional wind output The CPM also acts as the main interface between the aircraft spray navigation system and the rest of the AIMMS 20 Aircraft power is provided to the AIMMS 20 through the CPM module which steps the input voltage down 12 VDC and distributes it to power the balance of the modules th...

Страница 13: ...ications The four AIMMS 20 modules communicate with each other via a high speed digital serial Controller Area Network CAN bus The four conductor cable connected between the modules provides power to each of the modules and communication between them Communication between the AIMMS 20 and a host computing device GPS navigation or data acquisition system is via a standard RS 232 serial port ...

Страница 14: ...mation will be required concerning the physical installation on your aircraft First the straight line distance between the two GPS antennas referred to as the antenna baseline must be measured see Fig 6 This can be determined from known station information utilized for the unstallation or measured directly using a plumb bob first to mark the position on the ground directly below the each antenna t...

Страница 15: ...ard the CPM which can be downloaded after landing using the aimcfg software utility Section 4 4 1 However data requirements for the GPS IMU cross axis calibration are such that all raw system data must be recorded Raw data can be captured using the aimcfg utility see Section 4 4 4 Step by step instructions are provided followed by a graphical depiction of the flight segment 3 3 1 Pre Flight Proced...

Страница 16: ...id range or spray release airspeed Once stabilized repeat the yaw manoeuvre at this airspeed v Once again when the yaw manoeuvre is complete hold the operational airspeed on a constant true north heading for approximately 10 seconds and then increase the airspeed slowly to your maximum selected airspeed determined in step 3 vi At the highest TAS repeat the yaw manoeuvre vii Turn the aircraft aroun...

Страница 17: ...oeuvres 3 3 3 Inertial System Calibration Manoeuvres i Select any heading which will locate the aircraft in low or no traffic airspace to perform the following manoeuvre ii After stabilizing perform a 360 degree orbit to starboard at a bank angle of 15 degrees When complete stabilize on the original heading for approximately 5 seconds iii Repeat step ii using an approximate bank angle of 30 degree...

Страница 18: ... six orbits in total Figure 8 Inertial System Calibration Manoeuvres 3 3 4 Post Flight Procedure i Return to base and land ii E mail the log file on the USB FLASH memory device to support aventech com or the e mail address of your dedicated Aventech support engineer for post processing The new calibration parameters will be e mailed to you for programming into the AIMMS 20 system ...

Страница 19: ...32 port of the CPM module The serial cable has a 6 pin female circular connector on one end and two DSub 9 serial connectors on the other Connect the DSub 9 connector labelled COM1 with a black hood to your computer at this point in order to communicate with and setup the AIMMS 20 Once the communications cable is connected and the AIMMS system connected to power turn on the AIMMS Navigate to the i...

Страница 20: ... below will appear indicating the status of the log If log events are noted they will be downloaded to a file in the aimcfg installation directory If a communications failure occurs a dialog box will appear indicating a timeout condition This error condition indicates that communications have not been established with the system Additional action should be taken at this point to determine the caus...

Страница 21: ...y 4 4 File Menu Clicking on the File menu will display a list of options you will use to perform basic functions such as downloading the internal AIMMS data log or changing the COM port assignment and baud rate of the computer Each of the file menu items is described in Sections 4 4 1 to 4 4 6 4 4 1 Log Download Selecting Log Download will immediately start the process of transferring the contents...

Страница 22: ...ing Download Complete Press OK to return to the main form Note The AIMMS CPM internal data log is reset when two conditions are met 1 A GPS signal is available 2 And the system has been powered up for more than one minute This allows the log to automatically clear itself and prepare to record a new flight without any user actions beyond turning on the system If the user is unsuccessful on the firs...

Страница 23: ...fer process that normally starts automatically when aimcfg is launched see Section 4 2 4 4 3 View Broadcast Data Aircraft state and meteorological data is computed in real time by the AIMMS 20 and broadcast out the COM2 port of the CPM grey hooded DSub 9 connector on the provided serial cable If this serial port is connected to your computer it is possible to view this information directly in real...

Страница 24: ... system via the COM2 serial port of the CPM connected to your computer A dialog box will be displayed showing the filename being used to record the data and the number of bytes currently transferred Information should accumulate at a rate of a little more than 20 MB hour Simply click the Quit button to close the file and terminate the raw data collection process 4 4 5 COM Port The COM port and bau...

Страница 25: ...Accuair Flight Master 38 400 baud Satloc G4 38 400 baud When a COM port or baud rate setting change is performed the aimcfg program must be restarted for the change to take effect 4 4 6 Update Firmware The AIMMS 20 CPM firmware is field upgradable Updating the CPM s internal firmware is performed using the Update Firmware menu item and is described below Simply follow the instructions provided by ...

Страница 26: ...he user to insure the AIMMS 20 is powered down Press OK once you have verified that the system is OFF Click OK The aimcfg utility will now wait for the AIMMS to be powered up Note that it is only upon a power reset that a special message is sent from the processor that permits the firmware update process to begin The firmware load process should begin immediately after power has been applied to th...

Страница 27: ... for the AIMMS 20 system These parameters include 1 Internal data log status and period 2 Antenna Baseline Length 3 ADP Offset distance 4 Baud Rate 5 Data broadcast type and period 6 Local geomagnetic declination The latter item 6 the local geomagnetic declination is a legacy item and no longer required to be entered After selecting the Setup menu item aimcfg will respond by loading an image of th...

Страница 28: ...e ADP is offset from the aircraft centerline see Section 3 2 amongst the other parameters listed at the beginning of this section The units for distance measurements is meters divide by 3 281 to convert distance measured in feet to meters Once new settings have been entered into the window click OK to upload and program these settings into the CPM Data FLASH The new parameters will take effect on ...

Страница 29: ...end user by Aventech Research Inc The dynamic heating efficiency parameter should always be set to 0 42 as this is a function of the air data probe design and not subject to change Although magnetic sensor data is no longer utilized by the CPM firmware these calibration factors have been included for backwards compatibility Once the new values have been entered into the window click OK to upload a...

Страница 30: ...tput to optimize the performance of the IMU GPS integration These are determined upon special analysis of calibration flight data by Aventech Once the new values have been entered into the window click OK to upload and program these settings into the CPM Data FLASH The new parameters will take effect on the next power cycle of the instrumentation 4 8 Version The Version menu item displays the vers...

Страница 31: ...surement Range Accuracy Static Pressure 0 110000 Pa 100Pa 0 05 Pitot Static Differential 0 14000 Pa 20 Pa 0 05 AOA AOS Differential 7000 Pa 20 Pa 0 05 Acceleration 5g 0 005g 5 2 INERTIAL MEASUREMENT UNIT IMU Internal Sampling Rate 200 Hz Digital Low Pass Frequency 20 Hz 3 dB corner frequency Data Output Rate 40 Hz Measurement Range Accuracy 3 axis accelerations 5g 0 005g 3 axis angular rates 60 de...

Страница 32: ...ant 63 Step Response 5 sec 5 4 2 Relative Humidity Resolution 0 1 RH Accuracy 2 RH 5 4 3 Three Dimensional Wind North and East Components 0 50 m s 1 0 knot 150 knot TAS Vertical 0 50 m s 1 0 knot 150 knot TAS Broadcast Log Update Rate 1 10 Hz Log Capacity 45000 Records 12 5 hours 1Hz 5 5 ELECTRICAL Operating Voltage 12 5 37 VDC Input Max Operating Current 900 mA 12 5 VDC Digital Interfaces Control...

Страница 33: ... 2013 All Rights Reserved 5 6 ENVIRONMENTAL Operating Temperature 20 C to 50 C standard 40 C to 50 C special order Storage Temperature 40 C to 90 C 5 7 WEIGHT Air Data Probe ADP 3 36 kg 7 38 lb Inertial Measurement Unit IMU 0 74 kg 1 63 lb GPS Module GPS 0 80 kg 1 76 lb Central Processing Module 0 60 kg 1 32 lb ...

Страница 34: ...ta Packet is transmitted at the same rate as the aircraft state packet with flow rate data refreshed internally at a rate of approximately 12Hz A 2 Hardware Configuration The RS 232 serial interface utilizes only three lines receive transmit and ground The default baud rate is 19200 The system operates with no parity 8 data bits 1 stop bit A 3 Packet Format Each packet consists of a four byte head...

Страница 35: ...t 100 20 Wind direction deg true lsb 21 Wind direction deg true msb Unsigned int 100 22 Status flag bit 0 wind status 0 not valid 1 valid Char 1 Status flag bit 1 purge status 0 purge off 1 purge ON Char 1 Status flag bit 2 GPS solution status 0 GPS solution bad 1 GPS solution good Char 1 Notes 1 Wind flow vector points in the direction to which the wind is blowing 2 Wind direction is reported in ...

Страница 36: ...e geoid lsb 17 Altitude msb Int 1 18 Velocity north component m s lsb 19 Velocity north component msb Int 100 20 Velocity east component m s lsb 21 Velocity east component msb Int 100 22 Velocity down component m s lsb 23 Velocity down component msb Int 100 24 Roll angle deg lsb 25 Roll angle msb Int 100 26 Pitch angle deg lsb 27 Pitch angle msb Int 100 28 Yaw angle heading deg true lsb 29 Yaw ang...

Страница 37: ...mperature Packet ID 5 Byte Description Var Type Scale 5 Heater block temp C fwd lsb Int 10 6 Heater block temp C fwd msb Int 10 7 Heater block temp C aft lsb Int 10 8 Heater block temp C aft msb Int 10 9 Low temp threshold C lsb Int 10 10 Low temp threshold C msb int 10 Note Low temperature threshold setting is the temperature below which the internal probe block heaters are engaged The high thres...

Страница 38: ...8 Message 0 CAN data byte 2 u s short int 1 9 u s short int 1 6 m0 Message 0 CAN data byte m0 0 m0 8 u s short int 1 7 m0 Message 1 CAN 2 0A ID low byte bits b 7 b 0 Int 1 8 m0 Message1 CAN 2 0A ID high byte bits b 10 b 8 Length of CAN msg data segment value 0 8 bits b 14 b 11 Int 1 Message 1 CAN data byte 1 u s short int 1 8 m0 m1 Message 1 CAN data byte m1 0 m1 8 u s short int 1 23 Message 9 CAN...

Страница 39: ... Affected Sequence 0 Purge off all ports closed 1 Pitot port only for time period input 2 Sideslip port pair only for time period input 3 Angle of attack port pair only for time period input 4 Automatically step through port purge sequence s 3 2 1 255 Purge on all ports open indefinite period must be followed by sequence 0 for off Command Acknowledgement Packet ID NONE bytes data block 0 Descripti...

Страница 40: ...Var Type Scale 5 Low temp threshold C lsb Int 10 6 Low temp threshold C msb Int 10 Command Acknowledgement Packet ID NONE bytes data block N A Description No explicit acknowledgement is sent However the new set point can be readily verified by the value sent in the next broadcast of packet ID5 Internal Probe Temperature The high threshold i e temperature above which heaters are turned off is alway...

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