CXM539 User`s Manual - Willow Technologies
Contents
1. ZScale 32768 ZOrtho 65536 Zout Zin ZOffset ZScale 32768 Xin XOffset XScale 32768 XOrtho Yin YOffset YScale 32768 YOrtho 65536 Doc 7430 0114 01 Rev A Page 14 CXM539 User s Manual Crossbaw 8 Appendix C Filter Values and Data Rates A table containing some filter values and corresponding data rates resolution and frequency tested on CXM539 at 38 4 kbaud is provided in Table 2 below Table 2 CXM539 Filter Values Filter Text Binary Raw A D A D 3db Value Data Data Binary Sample Resolution Frequency rate rate data rate in bits Hz sec sec rate sec sec 8000 150 150 150 150 17 5 39 3 6000 200 200 200 200 17 52 4 4000 240 300 300 300 17 78 6 3000 240 370 400 400 16 5 104 8 2000 240 370 548 600 16 5 157 1800 240 370 548 800 16 209 1000 240 370 548 1200 15 5 314 900 240 370 548 1600 15 419 2 800 240 370 548 2400 14 629 600 240 370 548 3200 13 838 4 400 240 370 548 4800 12 1260 300 240 370 548 6400 11 1676 NOTE For the text data hex data was sent the data sample length was 16 bytes and hence the baud rate will limit the data rate to 240 samples sec For binary data the data sample length was 7 bytes and hence the baud rate will limit the data rate to 548 samples sec Doc 7430 0114 01 Rev A Page 15 CXM539 User s Manual Crossb w 9 Appendix D Wa2. Doc 7430 0114 01 Rev A Page 12 CXM539 User s Manual Crossb w 7 Not Used 8 Not Used 04 Baud Rate Control BaudRate 4 9152Mhz 16 BaudRateControl 1 Values for Common Baud Rates with no clock dividing 1200 255 FFH 19200 31 1FH 2400 127 7FH 38400 7 7H 9600 63 3FH 76800 3 3H 05 Not Used 06 07 Soft Offset X 08 09 Soft Offset Y OA OB Soft Offset Z OC OD Soft Scale X OE 0F Soft Scale Y 10 11 Soft Scale Z 12 13 Soft Ortho XY 14 15 Soft Ortho XZ 16 17 Soft Ortho YX 18 19 Soft Ortho YZ IA IB Soft Ortho ZX 1C 1D Soft Ortho ZY 1E 1F Pacing Value 30 32 A D Offset Calibration 0 Set When the A D is Calibrated 33 35 A D Gain Calibration 0 Set When the A D is Calibrated 36 38 A D Offset Calibration I Set When the A D is Calibrated 39 3B A D Gain Calibration 1 Set When the A D is Calibrated 3C 3E A D Offset Calibration 2 Set When the A D is Calibrated 3F 41 A D Gain Calibration 2 Set When the A D is Calibrated 42 43 Filter Settings Set for Data Rate Vs Data Noise 01 FAST Mode Enabled 02 Skip Mode Enabled 03 Chop Mode Enabled 04 Must Be 0 Doc 7430 0114 01 Rev A Page 13 CXM539 User s Manual Crossb w 05 16 12 bit Sync Filter 7 3 Software Data Correction Equations Xout Xin XOffset XScale 32768 Yin YOffset YScale 32768 YOrtho Zin ZOffset ZScale 32768 ZOrtho 65536 Yout Yin YOffset YScale 32768 Xin XOffset XScale 32768 XOrtho Zin ZOffset
3. followed by 4 hex digits address and optional 2 digits representing the number of bytes to send Write EEROM Data followed by a 4 hex digit address and 2 hex digits of Data Reset and Calibrate A D s Send ID and many internal values Reset and Restart Sensor Display Help Doc 7430 0114 01 Rev A Page 11 CXM539 User s Manual Crossb w 7 2 EEROM Map For all EEROM constants the least significant byte is stored in the lowest address and the most the most significant byte is stored in the highest address 00 Not Used 01 CPU Clock Speed Divisor 1 7 Clock Divisor 8 O Run at Full clock speed 1 Enable clock division CPU Speed 4 9152 MHz 129 ClockDivisor This used to allow the use of lower UART baud rates and Lower power consumption For example 300 baud could be used with the Clock Divisor set to 125 to divide the clock rate by 4 and the baud rate control register set to 255 02 Operating Mode 1 Send Corrected Data 2 Autosend Data until Stop autosend command received 3 Send Data Only Once On power up or single data by command 4 Send Data in a Text Format 5 Send Data in a decimal format Only checked if in Text format 6 Calibration Mode 000 Run Mode 001 Unlocked 010 Zero Mode 7 Calibration Mode 011 XField 100 YField 101 ZField 8 Calibration Mode 110 Field Delta 03 More Operating Mode 1 Send Check Sum with Data 2 Not Used 3 Not Used 4 Not Used 5 Not Used 6 Not Used
4. 1 Connect the 9 pin end of the digital signal cable to the port on the CXM539 2 Connect the other 9 pin end of the cable with backshell to the serial port of your computer 3 The additional black and red wires on the cable supply power to the Sensor Match red to power and black to ground The Doc 7430 0114 01 Rev A Page 3 CXM539 User s Manual Crossb w input voltage can range from 7 5 15 VDC See the specifications for your unit 6 WARNING Do not reverse the power leads Applying the wrong power to the Sensor can damage the unit Crossbow is not responsible for resulting damage to the unit 3 3 Setup MagView With the Sensor connected to your PC serial port and powered open the Mag View software 1 From the MagView main display click on Configure button and select the correct COM port Baud Rate default is 9600 and Sensor model You can log data to a file by entering a data file name 3 You can also administer various Sensor Settings and Special Settings via this Configure screen and save settings 4 The main screen provides the graphical visualization of various sensor parameters that can be checked from Graph menu 5 The Monitor window allows the user to view the data being sent from the sensor and allows the operator to send commands to the sensor 3 4 Take Measurements Once you have configured Mag View to work with your sensor pick what kind of measurement you wish to
5. 7430 0114 01 Rev A CXM539 User s Manual Crossb w 1 Introduction 1 1 Description of the System The CXM539 High Speed Digital 3 Axis Fluxgate Magnetometer is the first high speed digital output 3 axis fluxgate magnetometer to be commercially available The system can convert and transmit over its serial port at 38400 baud all three axes outputs at a rate of 250 samples per second Slower data rates can also be selected transmission rate and baud rates are user programmable The CXM539 uses 3 separate 16 bit sigma delta analog to digital A to D converters to achieve the high throughput The scale factor is set so that a full scale input of 10 T 1 G represents 32768 counts on the system A to D converters The least count represents about 3 nT Noise of the system is 1 2 counts The CXM539 system is ideally suited to situations where high speed magnetic data must be acquired and analyzed In the past such systems have normally used a combination of an analog output fluxgate and an A to D board in a PC The CXM539 simplifies and reduces the cost of the magnetic data acquisition system by eliminating the cumbersome A to D board The CXM539 can be used in either a command mode or autosend mode In the command mode the CXM539 responds to commands to transmit data issued by an external computer In the autosend mode the CXM539 commences sending data as soon as power is applied to the unit 1 2 Package Contents In addition to your CX
6. CXM539 User s ang Revision A March 2005 Document 7430 0114 01 Crossb w Crossbow Technology Inc 4145 N First Street San Jose CA 95134 Tel 408 965 3300 Fax 408 324 4840 email info xbow com website www xbow com 1999 2005 Crossbow Technology Inc All rights reserved Information in this document is subject to change without notice Crossbow and SoftSensor are registered trademarks and DMU is a trademark of Crossbow Technology Inc Other product and trade names are trademarks or registered trademarks of their respective holders CXM539 User s Manual Crossbow Table of Contents 1 Introductioii ssssssesssssssesssssssseseissssssossssessesssessoscsesssotsssessvesssceses 1 1 1 Description of the System resnnnvavnnnnrnvrnnvrerennrsvannernsrrrenereresvennee 1 1 2 Package Contents anakan an seses er rE E Res 1 2 Electrical and Mechanical Interface sesesssersnssnvsvrnvsvevnverseee 2 3 Quick SEE enssonun NANANANANINNINGNANDNALANDIUN ANAN 3 3 1 Mag View Software sornrnvrnnorerennnsnaenernrrvrnnereresnnsvaenennsesrenereresvesnee 3 3 2 CONNECONS sassanidene Aa alan 3 3 setup Map VIEW mam na NANNING BIGAA NANANG 4 3 4 Take Measurements isc nan BINABANATAN 4 4 System Startup and Checkout csssscssssccsssscsssscsssescssscees 5 41 Startup Using a Terminal Emulator Program 5 4 2 System CHECK OU kn mansanas BRING TAHANANG KANA 5 5 CXM539 Configuration and Data Formats scsseseeeee 7 6 Appe
7. M539 sensor product you should have e 1 CD with MagView Software Mag View will allow you to immediately view the outputs of the Sensor on a PC running Microsoft Windows e 1 Digital Signal Cable This links the Sensor directly to a serial port Only the transmit receive power and ground channels are used e 1 User s Manual This contains helpful hints on programming installation valuable digital interface information including data packet formats and conversion factors Doc 7430 0114 01 Rev A Page 1 CXM539 User s Manual Crossb w 2 Electrical and Mechanical Interface The CXM539 is powered from a single input voltage that can range between 7 5 V and 15 VDC Current consumption is 100 mA Two serial interfaces are available one that uses RS 232 levels and one that uses TTL levels The baud rate is user programmable and can be set at the following values 300 1200 2400 4800 9600 19200 38400 and 72800 The data words employ 8 bits with one stop bit and no parity A female 9 pin D connector is used to provide an electrical interface to the CXM539 system The Pin out of this connector is shown in Table 1 Table 1 CXM539 Connector Pin Out Pin Function Not used RS 232 Transmit Data RS 232 Receive Data Not used Ground TTL Serial Out TTL Serial In Factory Use Only Input Power 7 5V to 15VDC NO 00 IQ IO In JH FH IN Je A drawing showing the dimensions and
8. Z SB M N 12 34 56 78 9A BC 5A lt CR gt lt LF gt The X Y amp Z values are each encoded as a two byte value The X Y Z data is followed by a constant synchronization byte SB of 5A M B Raw data in a binary format with a checksum M R X Y Z cs SB M E 12 34 56 78 9A BC AE 5A lt CR gt lt LF gt IMPORTANT When in Binary mode the X Y amp Z values for magnetometer data are encoded as a signed integer 2 s complement with a conversion factor of MSB 256 LSB in Gauss 215 M or Mjor M This is followed by a checksum consisting of the lower eight bits of the sum of the bytes comprising the X Y amp Z Data and calculated as sum of all bytes except checksum and SA 256 Checksum This is followed by a synchronization byte of 5 A which represents the end of the data packet Doc 7430 0114 01 Rev A Page 8 CXM539 User s Manual Crossb w To determine the mode of a CXM539 issue the command M The autosend command A enables data to be sent continuously upon power on The output rate of the sent data is set by the pacing variable which can vary from 0000 full speed to FFFF very slow Pacing values are set by commands of the form P XXXX lt CR gt lt LF gt The filter value for A D can be set and the data rate can be accordingly changed by F XXXX lt CR gt lt LF gt Different filter values and corresponding data rates resolution and frequency are provided in Appendix B The use
9. e the equipment in the original shipping container s making sure there is adequate packing around all sides of the equipment If the original shipping containers were discarded use heavy boxes with adequate padding and protection 9 3 3 Sealing the Container Seal the shipping container s with heavy tape or metal bands strong enough to handle the weight of the equipment and the container 9 3 4 Marking Please write the words FRAGILE DELICATE INSTRUMENT in several places on the outside of the shipping container s In all correspondence please refer to the equipment by the model number the serial number and the RMA number 9 3 5 Return Shipping Address Use the following address for all returned products Crossbow Technology Inc 4145 N First Street San Jose CA 95134 Attn RMA Number XXXXXX 9 4 Warranty The Crossbow product warranty is one year from date of shipment Doc 7430 0114 01 Rev A Page 17 Crossbgw Crossbow Technology Inc 4145 N First Street San Jose CA 95134 Phone 408 965 3300 Fax 408 324 4840 Email info xbow com Website www xbow com
10. mounting hole location of the CXM539 is shown in Appendix A Doc 7430 0114 01 Rev A Page 2 CXM539 User s Manual Crossb w 3 Quick Start 3 1 MagView Software The purpose of the Sensor interface program is to provide a graphical output interface to the CXM539 Magnetometer and allow the user to configure and operate the sensor The Mag View interface program allows the sensor to be monitored in every mode that the sensor can be programmed The sensor can be programmed to allow for ASCII or BINARY transfer mode and corrected or non corrected data Log files of sensor data can be created A scrolling graph of the digital data and graphical indicators of the angular data are displayed to the operator Minimum and maximum values are maintained for the magnetometer and the accelerometers 3 1 1 MagView Computer Requirements The following are the minimum capabilities that your computer should have in order to run MagView successfully e CPU Pentium Class e RAM 32MB minimum 64MB recommended e Operating System Windows 98 NT4 2000 XP 3 1 2 Install MagView To install Mag View software on to your computer 1 Insert the CD Support Tools in the CD ROM drive 2 Find the MagView folder and copy it over to your desktop and the software ready to use If you have any problems or questions you may contact Crossbow directly 3 2 Connections The CXM539 is shipped with a ribbon cable to connect the sensor to a PC COM port
11. ndix A Mechanical Specifications 00 000 00 10 6 1 CXM539 Outline Drawing esrernrnvnrnvnvrnvrrnververvrrrrversversveseevserer LO 7 Appendix B CXM539 Commands seesvssevssevssvvevsvessseessesssesenee 11 TA User Commands aan ABAD NTIN NAN NANG 11 12 EEROM Mapua aan 12 7 3 Software Data Correction Equations 14 8 Appendix C Filter Values and Data Rates 000 000s 15 9 Appendix D Warranty and Support Information 16 9 1 Customer Service r rrnnanennvnenrrvennnnerravennnnerrrrsnnenerrassnneneerssennenenr 16 9 2 Contact DIPECLO Nasaan nan ba generne sneen LO 9 3 Return Procedure aa GANGBANG e enno n K Ei 16 94 Waray nsen oriee e ae inah EEEE E ROEE Ee 17 Doc 7430 0114 01 Rev A Page iii CXM539 User s Manual Crossb w About this Manual The following annotations have been used to provide additional information NOTE Note provides additional information about the topic M EXAMPLE Examples are given throughout the manual to help the reader understand the terminology IMPORTANT This symbol defines items that have significant meaning to the user 6 WARNING The user should pay particular attention to this symbol It means there is a chance that physical harm could happen to either the person or the equipment The following paragraph heading formatting is used in this manual 1 Heading 1 1 1 Heading 2 1 1 1 Heading 3 Normal Page iv Doc
12. r can set the baud rate of the CXM539 to the standard values from 300 to 76800 baud The baud rate command is of the form B XXXX lt CR gt lt LF gt A complete list of the CXM539 commands can be found in Appendix B Doc 7430 0114 01 Rev A Page 9 CXM539 User s Manual Crossb w 6 Appendix A Mechanical Specifications 6 1 CXM539 Outline Drawing 1 3 32 8 4 cm e a e A 0o 000 Fi 4 0 10 4 cm Doc 7430 0114 01 Rev A Page 10 CXM539 User s Manual Crossb w 7 Appendix B CXM539 Commands 7 1 User Commands All commands must be followed by a return All changes to the mode value are saved as the power up mode M M R M C M B M T M E M N P P H E E W XX Send the current mode value All Data is Sent as raw A D Counts in ASCII four digit Hex values or Binary Values depending on the current mode All Data is Sent as Gammas Formatted as base Ten fixed point Text or Binary Values depending on the current mode Set Data is Formatted as Binary Numbers Set Data is Formatted as Text Numbers Send a checksum with all Data Don t Send a checksum Start Auto Send Data Stop Auto Send Send the current Data Value Send the run mode Baud Rate Set Run Mode Baud Rate 300 76800 Baud is accepted In Config Mode the baud rate is always 9600 Display the current pacing value Set a Pacing value to slow the data rate Send All EEROM Data Send EEROM Data
13. reads about 0 5G and the Y and Z axis is read near zero Repeat the measurement with the Y and Z axes in turn pointed into the field and verify that these two axes correctly read the earth s magnetic field magnitude If a terminal program is used before checking the system operation ensure that the following commands are given M T lt CR gt lt LF gt M C lt CR gt lt LF gt A lt CR gt lt LF gt Doc 7430 0114 01 Rev A Page 5 CXM539 User s Manual Crossb w These commands set the transmission mode to be autosend calibrated text After issuing the A command the terminal output will display the continuous output from the CXM539 Orient the system in the earth s magnetic field to verify proper operation as discussed above Doc 7430 0114 01 Rev A Page 6 CXM539 User s Manual Crossb w 5 CXM539 Configuration and Data Formats The user can configure the CXM539 system in the following ways 1 Mode 2 Autosend or command 3 Baud rate 4 Pacing The mode settings are used to change the format of the data output The user can select the data output to be raw A D counts M R or calibrated in Gauss M C data The serial output format can be selected to be text M T or binary M B The user can also choose whether to append a checksum to the transmission M E or omit this M N Some examples of different data output formats and the commands used to create them are as follows Commands Data Formats M T Ra
14. rranty and Support Information 9 1 Customer Service As a Crossbow Technology customer you have access to product support services which include e Single point return service e Web based support service e Same day troubleshooting assistance e Worldwide Crossbow representation e Onsite and factory training available e Preventative maintenance and repair programs e Installation assistance available 9 2 Contact Directory United States Phone 1 408 965 3300 8 AM to 5 PM PST Fax 1 408 324 4840 24 hours Email techsupport xbow com Non U S refer to website www xbow com 9 3 Return Procedure 9 3 1 Authorization Before returning any equipment please contact Crossbow to obtain a Returned Material Authorization number RMA Be ready to provide the following information when requesting a RMA e Name e Address e Telephone Fax Email e Equipment Model Number e Equipment Serial Number e Installation Date e Failure Date e Fault Description Doc 7430 0114 01 Rev A Page 16 CXM539 User s Manual Crossb w 93 2 Identification and Protection If the equipment is to be shipped to Crossbow for service or repair please attach a tag TO THE EQUIPMENT as well as the shipping container s identifying the owner Also indicate the service or repair required the problems encountered and other information considered valuable to the service facility such as the list of information provided to request the RMA number Plac
15. see AutoData will show you the output you choose as a strip chart type graph of value vs time DataOnce issues the command to send the data one time Monitor window allows the user to view the data being sent from the sensor and allows the operator to send commands to the sensor Doc 7430 0114 01 Rev A Page 4 CXM539 User s Manual Crossb w 4 System Startup and Checkout 4 1 Startup Using a Terminal Emulator Program Connect the CXM539 to serial port of a PC as described in Section 3 2 Connect a power supply 7 5 V to 15 V to the red positive and black banana plug on the cable Start up a terminal emulator program on the PC e g Windows HyperTerminal PC Plus etc Configure the terminal emulator program for direct connect to an available com port and select the baud rate 9600 with one stop bit and no parity Apply power to the system and check to see that the unit transmits a start up message APS 539 V1 12 4 2 System Checkout After the CXM539 is operational and communicating with a computer its proper operation can be qualitatively checked out by using it to measure the earth s magnetic field Around the globe the magnitude of the earth s magnetic field varies from about 0 4 Gauss to 0 6 Gauss In the northern hemisphere the field points north and dips into the ground dip angle at about 60 Point the X axis generally north and down at an angle of 60 from horizontal Verify that the X axis
16. w data in a text hex format without a checksum M R xX Y Z M N 1234 5678 9ABC lt CR gt lt LF gt The X Y amp Z values are encoded as four digit hex values separated from each other with a single space The last digit of the Z data is followed by a carriage and a line feed M T Raw data in a text hex format with a checksum cs M R X Y Z cs M E 1234 5678 9ABC 4E lt CR gt lt LF gt This just like the last example except for an addition of a space and a two digit checksum in Hex between the last digit of Z and the carriage return The checksum is composed of the sum of all of the digits in the X Y amp Z data values M T Corrected data in a text decimal format without a checksum M C X Y Z M N 0 23456 0 78900 0 23997 lt CR gt lt LF gt Doc 7430 0114 01 Rev A Page 7 CXM539 User s Manual Crossb w The X Y amp Z values are encoded as decimal values in Gauss Each is separated from the next with a single space The last digit of the Z data is followed by a carriage return and a line feed M T Corrected data in a text decimal format with a checksum M C X Y Z cs M E 0 23456 0 78900 0 23997 4C lt CR gt lt LF gt This is just like the last example except for an addition of a space and the two digit checksum in Hex between the last digit of Z and the carriage return The checksum is composed of the sum of all of the digits in the X Y amp Z data values M B Raw Data in a binary format without a checksum M R X Y
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