ARTS User Manual v1.1
Contents
1. Byte Meaning 1 Preceding lt CR gt 2 ID 0x03 3 Flight State 4 Barometric Sensor High byte 5 Barometric Sensor Low byte 6 Minimum Barometric Sensor High byte 7 Minimum Barometric Sensor Low byte 8 11 Reserved should be ignored 12 GPS Status 13 CKSUM 14 Terminating lt CR gt Flight State This reports the ARTS s state during the flight and takes one of the following values 0x00 Awaiting Launch 0x01 After Launch before arming 0x02 Awaiting motor burnout 0x03 After burnout before apogee 0x04 At apogee 0x05 Post Apogee before main deploy 0x06 After deployment drifting 0x07 Reserved Barometric Sensor Value This is the current value being read from the ARTS s barometric sensor Use this value for reporting the rocket s current altitude Convert to altitude using the formulas given Appendix C 18 Minimum Barometric Sensor Value This is the minimum barometric sensor value recorded by the ARTS during the current flight Remember that atmospheric pressure reduces as you go higher so this minimum value can be used to determine the rocket s peak altitude Convert this value to altitude using the formulas given in section 2 2 GPS Status This gives the current status of a GPS unit attached to the ARTS It takes one of the following values 0x00 No GPS connected 0x01 GPS connected2. OZARK WV AGROSPACE ARTS User Manual v1 1 Altimeter Recording amp Telemetry System 2003 Ozark Aerospace LLC Table of Contents l IMFOAUCTION Re 2 Il Mounting the ARTS snnnrneese 4 ll Configuring the ARTS se 5 IV PPI PSS 8 V POS FHQN ES tnuine 8 VI Downloading Analyzing Data 8 Vil Saving Loading Exporting Data see 13 VIII Altimeter Diagnostic FUNCTIONS ss 13 IX Advanced Diagnostics mme 14 Appendix A Telemetry Subsystem ssesesscscscoscscsccscsse 15 Appendix B Terminal Communications 21 Appendix SenSofrS ssesscscscoscscscoscscscoscscscoscscocoscscscosesse 31 Appendix D Connector PINOUtS ss 33 ARTS Warranty Terms and Conditions os osossoss0s00s000 34 l Introduction Thank you for purchasing the ARTS flight computer by Ozark Aerospace Please read this manual carefully and completely before using the ARTS and we highly recommend gaining some flight experience by using the ARTS with a backup or for data collection only before going solo with it Precautions The ARTS contains parts that are sensitive to damage from ESD electro static discharge Always ground yourself before handling the ARTS ESD damage is not covered under warranty Always allow the ARTS and the battery to adjust to ambient temperature prior to arming and flying Never handle or move the rocket or the ARTS when the ARTS is armed and connected to live py
3. Igniter Expansion Board Profile 1 DIP SW 1 ON Channel 1 Apogee 4 Load from At will fire 0 0 seconds after Apogee i Save to Alt Channel 2 Main will fire 0 0 seconds after Altitude 800 feet Sampling Rate im Samples Second 164 Seconds You should first click on Load from Altimeter first to verify the settings that are currently saved Once the Altitude and or the Sampling Rate have been satisfactorily set click on Save to Altimeter to program the ARTS 6 To set Profile 2 click on the Profile 2 tab You will see FA Ozark Aerospace ARTS Data Analyzer k fol 4 2 EE F A Altimeter Configuration File Profie1 Profile 2 GPS Port Igniter Expansion Board Profile 2 DIP SW 1 OFF Channel 1 Apogee lt Load from A will fire 0 5 gt seconds after Apogee z Save to Alt Channel 2 Main will fire 0 0 7 seconds after Altitude v Sampling Rate e0 feet 200 z Samples Second 82 Seconds This profile is a bit more complex For each channel you can set the time to fire after a certain event Itis recommended to load the data from the ARTS change the values and then save the changes to the ARTS The Launch event will typically be used for air starts and timed events The MECO event will typically be used for Staging The Apogee event will typically be used to deploy the drogue chute The Altitude event will typically be used to deploy the m
4. This command tells the ARTS to sample its barometric and accelerometer sensors and send their raw data values The data sent is in the following format Byte Meaning ASCII B Barometric Sensor High Byte Barometric Sensor Low Byte ASCII A Accelerometer High Byte Accelerometer Low Byte Wi Ny HIS ID I 22 This sequence 1s repeated until any byte is sent to the ARTS This byte will be ignored it is just used as a signal to stop sending sensor data Status Request This command tells the ARTS to report its status This 1s sent as a serried of bytes defined as follows Byte Meaning 1 Status 1 2 Status 2 3 GPS Status 4 25 GPS Position Status 1 Bit 7 Switch SW 2 Status 1 Off 0 On Bit 6 Switch SW 1 status 1 Off 0 On Bits 5 0 Reserverd Status 2 Bits 7 3 Reserved Bit 2 Output Channel 2 Main status 1 Open 2 OK Bit 1 Output Channel 1 Apogee status 1 Open 0 OK Bit 0 Reserved GPS Status 0 No GPS attached 1 GPS attached but no fix 2 GPS attached and reporting locked on a fix 23 GPS Position These 22 bytes are only transmitted if the GPS is reporting that it is locked on a fix The 22 bytes containing the GPS position are the 22 bytes following the comma after the time in a GPGGA NMEA sentence or the 22 bytes following the first comma in a GPGLL sentence Reques
5. but no fix being reported 0x02 GPS connected and reporting a valid fix GPS Position Packet The GPS position packet is defined as follows Byte Meaning 1 Preceding lt CR gt 2 ID 0x04 3 25 22 bytes containing GPS position 26 CKSUM 27 Terminating lt CR gt The 22 bytes containing the GPS position are the 22 bytes following the comma after the time in a GPGGA NMEA sentence or the 22 bytes following the first comma in a GPGLL sentence 19 Post Flight Status Packet The Post Flight Status packet is defined as follows Byte Meaning 1 Preceding lt CR gt 2 ID 0x05 3 Minimum Barometric Sensor High byte 4 Minimum Barometric Sensor Low byte 5 10 Reserved should be ignored 11 CKSUM 12 Terminating lt CR gt Minimum Barometric Sensor Value This is the minimum barometric sensor value recorded by the ARTS during the current flight Remember that atmospheric pressure reduces as you go higher so this minimum value can be used to determine the rocket s peak altitude Convert this value to altitude using the formulas given in section 2 2 Ping Test Packet The Ping Test packet is defined as follows Byte Meaning 1 Preceding lt CR gt 2 ID 0x06 3 Count 4 26 Reserved should be ignored 27 CKSUM 28 Terminating lt CR gt Count DataAnalyzer increments this byte by one for each packet sent
6. This is the value the ARTS actually compares to its ADC readings during flight to determine an altitude trigger This value can be calculated as follows val1 101 304 exp 1 Altitude 26216 val2 5 0 01059 val1 0 152 ADC_val val2 5 1024 ADC_val 2 Note that this value is only looked for after apogee is detected Checksum This is a simple one byte addition of the 15 profile bytes Ack Nack The ARTS will return an Ack ASCII Y if the profile is received intact or a Nack ASCII N if it is not The ARTS will also chirp its beeper once if profile 1 is received properly or twice if profile 2 is received correctly If the profile is not received correctly the ARTS will beep five times 28 Upload Profile This command requests the ARTS to send one of its stored profiles This command requires a dialog between the ARTS and the host computer The dialog is as follows ASCII U gt r ASCII x o i H ASCII P Profile 0x01 or 0x02 U gt T i 15 byte Profile defined below S i 1 byte checksum ka The 15 byte profile and the 1 byte checksum are identical to those defined in section 3 11 Download Profile Upload Firmware This command tells the ARTS to prepare for receiving a new firmware image Download GPS Config This command tells the ARTS to prepare for receiving new GPS configuration parameters This command requir
7. is zoomed in on An example of zooming shows the acceleration under thrust here 10 CP Ozark Dato Chart re Yew AS EREE I met 0236s atrude 461 306 Aroel 152 482 tyet s Untitled There are a few buttons at the top that will change the view of the graph A Zooms the graph out to original size Turn On Off barometric altitude g El Turn On Off accelerometer altitude El Turn On Off Velocity El Turn On Off Acceleration lI Turn On Off MECO Apogee Main lines 11 There are 2 other buttons on the bar Saves the current graph to disk as a BMP Bitmap file BS Prints the current graph to the selected printer There is also a real time plot function To access this feature click View gt Real Time Plot The graph will clear itself and you will see Real Time Chart Control O69 gt Start MET 0 000 s Il Pause Alt 0 000 ft I gt Step Acc 0 000 ft s s CG Reset Vel 0 000 ft s Click play and DataAnalyzer will start drawing the graph Pause will pause the graph and Step will advance the graph one time unit To exit click the Close button 12 Vil Saving Loading Exporting Data To save your data file click Flight gt Save As on the main screen or click the Ea icon also located on the main screen The filename will have an extension of ODF To load a data file click Flight gt Open on the main screen or click the icon also located on the main
8. out It can be used to determine link packet loss 20 Appendix B Terminal Communications Once the ARTS is in command mode it is then ready to accept commands The ARTS signals it is ready to accept a new command with a gt prompt Commands are single characters followed by data if necessary The available commands are Command Meaning z Buzzer Test y Version Information Request a Sensor Test s Status Request dV Request Data Dump T Radio Test T Fire Output Channel 1 Apogee P Fire Output Channel 2 Main g Request GPS Status D Calibrate Accelerometer DA Download Profile U Upload Profile F Upload Firmware 7 Download GPS Config Buzzer Test This command tells the ARTS to perform a buzzer test Listen for a series of tones to come from the buzzer 21 Version Information Request This command tells the ARTS to send its version information This is sent as a series of bytes as follows Byte Meaning 1 Hardware Type High Byte 2 Hardware Type Low Byte 3 Firmware Version High Byte 4 Firmware Version Low Byte 5 Firmware Version Tenths 6 Firmware Version Hundredths 7 Sensor Type High Byte 8 Sensor Type Low Byte 9 x Firmware ID String X 1 Firmware Build Date y The Firmware ID String and Firmware Build Date are lt CR gt terminated ASCII strings Sensor Test
9. screen To use the data in an external program you can export the interpreted data as a Comma Separated Values csv text file Click on Flight gt Export gt Interpreted Data Vill Altimeter Diagnostic Functions To access the diagnostic menu click Altimeter gt Diagnostics on the main screen ees A Altimeter Diagnostics BAX Edit Advanced RadioT est Boomer Sw Sensors pg Es Puy Z ersion Download Data Fire Apoge if Q Fire Main fl Close No Com wi Altimeter 0 The red circle indicates no connection to the ARTS or no power When the ARTS is properly connected and is powered on the circle will turn green The button functions are as follows Chirp Sound a tone on the ARTS Radio Test If you have the Telemetry system this will perform a radio check Boomer Sw Shows the status of both output channels and the DIP switches Sensors Shows live values of both the accelerometer and barometric sensors Try shaking the ARTS to test the acceleromter FW Version Shows the current Firmware Revision Download Data Download the Flight Data WARNING Both of the next buttons can be dangerous Fire Apogee Fire output channel 1 Fire Main Fire output channel 2 IX Advanced Diagnostics To re calibrate select Advanced gt Calibrate Altimeter from the Altimeter Diagnostics Menu The ARTS is calibrated during production so you should
10. taken only at power up and are not updated continuously lll Configuring the ARTS One of the most powerful features of your ARTS system is the ability to program the 2 output channels Each output channel can respond to any of 4 events Launch Main Engine Cutoff MECO Apogee and Altitude Also a specific time delay between the event and the activation of the output channel can be set The most basic configuration would have Channel set to fire 0 0 seconds after apogee and Channel 2 set to fire 0 0 seconds after a specified Altitude say 800 feet The ARTS can hold two different flight profiles They are selected via DIP Switch 1 These profiles allow the ARTS to quickly change functions without having to attach a laptop Profile 1 is an Apogee Altitude only profile while Profile 2 is fully customizable Also configurable is the sampling rate Higher sampling rates increase the number of data points but decrease the recording time The recording time is displayed next to the sampling rate in the profile screens If the recording time is too short for your flight simply decrease the sampling rate To set these values start up DataAnalyzer connect the ARTS using the serial cable to your computer and power it on Select Altimeter gt Configuration or click the Ed icon on the main screen You will see EX Ozark Aerospace ARTS Data Analyzer BaS a Be F FA Altimeter Configuration File Profile 1 Profile 2 GPS Port
11. the rocket for the ARTS that is protected from ejection gasses and is vented to external pressure The ARTS must be mounted vertically with the arrow on the board facing up when the rocket is in the firing position The ARTS is supplied with two 1 2 standoffs and 6 machine screws that can be placed either on the front or back of the board Alternatively the four corner holes can be used with 4 machine screws The ARTS must be rigidly mounted The ARTS uses the accelerometer to detect both liftoff and apogee The ARTS will only function properly when securely mounted Use a fresh 9V alkaline battery A snap type battery clip can be used However a more reliable method is to solder wires directly to the battery terminals Observe the correct polarity when attaching the battery to the ARTS plus is marked on the board Connecting the battery does not power up the ARTS There are separate power and switch connectors and when the switch is off there is no load on the battery The switch connector should be connected to an external switch for arming Choose a high quality switch Use caution with the output channels Always wear eye protection when working with live pyrotechnic charges Always shunt charges and igniters until the rocket is in the firing position Do not arm the ARTS until the rocket is on the pad and in the FIRING POSITION Unlike some other accelerometers the baseline readings are
12. a GPGGA NMEA sentence or the 22 bytes following the first comma in a GPGLL sentence Calibrate Accelerometer This command will tell the ARTS to calibrate its accelerometer sensor It will sum 64 reading from the accelerometer at each orientation 1g Og and 1g and store these sums in its internal memory These values will be sent along with flight data when a Data Download Request is sent Your application should use these values to calibrate its 1g value for flight calculations This command requires a dialog between the ARTS and the host computer The dialog is as follows 25 ASCII D gt ASCII requesting 1g orientation ASCII lt CR gt gt 64 ASCII one for each sample taken ASCII 0 requesting Og orientation Tin O ASCII lt CR gt M gt P R U 64 ASCII one for each sample taken T TK s E R ASCII requesting 1g orientation ASCII lt CR gt gt 64 ASCII one for each sample taken ASCII X r 6 bytes of data The 6 bytes of data comprise the 16 bit sums of the 64 samples taken at each orientation They are defined as follows Byte Meaning 1 1g High Byte 2 1g Low Byte 3 Og High Byte 4 Og Low Byte 5 6 lg High Byte 1g Low Byte 26 Download Profile This command will tell the ARTS to receive and store a new flight profile This c
13. ain chute IV Pre Flight Once the rocket is on the pad the switch is turned on You will hear a series of beeps repeated to show the state of the output channels 1 long beep low tone Neither channel has continuity 1 short beep high tone Channel 1 continuity 2 short beeps high tone Channel 2 continuity 3 short beeps high tone Both 1 and 2 have continuity V Post Flight Post flight the ARTS continues to record data until its memory is full This can take from 82 seconds to up to 26 minutes at the slowest sample rate When the memory is full the ARTS begins to beep out the maximum altitude Thus if you recover your rocket before the memory is full the ARTS will not yet be beeping You may wait for the ARTS to beep the altitude or the switch can be turned off to conserve battery life This will not erase the ARTS memory and the flight can be downloaded at a later time VI Downloading Analyzing Data To retrieve the flight data start up the DataAnalyzer program connect the serial cable between the ARTS and the computer and then power up the ARTS The status bar on the bottom of the main screen will show the connection status If you hear the ascending 8 beeps the ARTS has gone into flight mode Check your cables and Com port settings and try power cycling the ARTS Once communication has been established select Altimeter gt Download Flight Data or click on the Y icon on the main screen A progress bar will app
14. ear and when the download is done you will see a summary screen A ozark Aerospace ARTS Data Analyzer terry 2104t odf Flight Edit View Altimeter Tools Help e En F Event Value MET Max G 10 772 0 255 MAX Ace 346 531 0 255 Max Velocity 226 819 1 020 Max Altitude 817 436 10 730 Max Acc Alt 744 011 6 845 Apogee Drogue Deployment 7 465 s Descent Rate under Drogue 30 696 ft s Main Deployment 23 345 s Decent Rate under Main 26 013 ft s This screen shows the most pertinent information of the flight To view a graph of the data select View gt Flight Data Graph or click on the El icon on the main screen You will see A Ozark Data Chart Fie Wew Bal IEEE I Mer 26 2465 Abuda 7512854 Accel 1 550 44 f sif e e 5 2 SJ L S gt Mission Elapsed Time MET is shown on the X Axis On the left side of the graph is the scale for the Altitude and on the right side is the scale for the Velocity and Acceleration As you move the cursor around the graph you will see the numbers at the top of the graph change These are showing your current place on the X an Y axis The graph can also be moved and zoomed Moving the graph is accomplished by right clicking and holding the button down while dragging the cursor Zooming is accomplished by left clicking on the graph and moving the yellow crosshairs from the upper left to the lower right forming a box This box will be the area that
15. en though 5V DC is provided on two connectors it is not recommended to use these a power source DO NOT draw more than 10mA from these sources 33 ARTS Warranty Terms and Conditions Reasonable care has been exercised in the design fabrication and testing of the ARTS by Ozark Aerospace its subcontractors Ozark Aerospace warrants the ARTS for a period of 90 days from the date of purchase Ozark Aerospace will repair or replace any ARTS at its discretion during the warranty period Damage to the ARTS resulting from rocket flight recovery failures or ground testing is not warranted under any circumstances ARTS recovery modes are used for experimental purposes only and shall not be used where failure would cause injury or property damage The purchaser and user of the ARTS accept all risks and responsibilities for its testing installation and use The ARTS purchaser or user shall not hold Ozark Aerospace or its employees and contractors liable for any consequential or incidental damages resulting from its use First time use of the ARTS signifies acceptance of these terms Any modifications made to the ARTS by the user or connection of equipment not provided by Ozark Aerospace shall make this warranty void 34
16. es a dialog between the ARTS and the host computer The dialog is as follows 29 ASCII J gt c GPS Baud Rate O gt a 3 Reserved Bytes U gt T T 1 byte checksum S E gt R Ack ASCII Y or Nack ASCII N e GPS Baud Rate This sets the baud rate at which the ARTS sets it GPS port It can be one of the following values 0 4800bps 1 9600bps 2 19200bps Reserved Bytes These three bytes are reserved for future use Checksum This is a simple one byte addition of the 4 GPS configuration bytes 30 Appendix C Sensors The ARTS uses the Analog Devices ADXL150 accelerometer and the Motorola MPXA4100A pressure sensor The sensors are read using the PIC16F876 processor s built in 10 bit ADC To facilitate other ARTS functions both of the sensors are read at 200Hz regardless of the recorded rate Accelerometer The ADXL150 is set for 50G with a resolution of 38mV G per its datasheet Its output is then passed through a low pass RC filter set at 600Hz The calibration value used for computations during flight is calculated when the ARTS enters flight mode and is the average of 16 samples This value is used as a Zero G baseline This value is saved in FLASH and is downloaded along with flight data The calibration values used for post flight computations are calculated by averaging 64 samples at 1g 1g and 0 When commanded throug
17. h using DataAnalyzer for example the ARTS will sum 64 readings at each orientation and save them into its internal FLASH These values are sent along with flight data during download Barometric Sensor The Motorola MPXA4100A pressure is used to sense air pressure during flight The sensor s output is filtered through an RC filter before being read by the processor 31 The calibration value used for computations during flight is calculated when the ARTS enters flight mode and is the average of 16 samples This value is used as a Zero Altitude baseline This value is saved in FLASH and is downloaded along with flight data Readings from this sensor can be converted to altitude using the following formulas BaroADC_Val 1024 0 152 0 01059 26216 log Pressure 101 304 Pressure Altitude The pressure calculation comes from Motorola s datasheet for the MPXA4100A The altitude calculation is based on NOAA S definition of a Standard Day To obtain a real altitude above ground you should calculate the altitude using the calibration value and subtract it from the altitude calculated from the recorded flight data 32 Appendix D Connector Pinouts For all connectors Pin 1 is denoted by a square pad Terminal RS232 levels 1 GND 2 RxD 3 TxD GPS RS232 levels 1 GND 2 TxD 3 RxD 4 5V DC AUX TTL levels 1 TxD 2 GND 3 Tx Switch 4 RxD 5 5V DC Please note that ev
18. not normally have to calibrate your unit 14 Appendix A Telemetry Subsystem The ARTS flight computer is designed with full support for real time telemetry What follows are the technical details required for a live telemetry interface Ozark Aerospace plans to offer a complete telemetry package with transmitter receiver GPS and associated software for sale in the near future Telemetry data is sent out the AUX port at 1200bps NRZ at TTL levels Packet Structure The packets have the following structure lt CR gt ID Data CKSUM lt CR gt 1 byte 1 byte multiple bytes 1 byte 1 byte Where lt CR gt is ASCII Carriage Return decimal 13 0x0d The packets are delimited by a preceding and terminating ASCII lt CR gt It is up to the receiving software to determine and maintain synchronization ID The packet ID byte is one of the following ID Function 0x01 PreLaunch Status 0x02 Prelaunch GPS Position 0x03 Flight Status 0x04 GPS Position 0x05 Postflight Status 0x06 Ping Test 15 Data The data portion of each packet is described in the packet detail sections to follow CKSUM is the checksum of the packet It is a simple one byte addition of the ID and data bytes Pre Launch Status Packet The pre launch status packet has the following structure Byte Meaning 1 Preceding lt CR gt 2 ID 0x01 3 Barometric Sensor Cal High byte 4 Ba
19. ommand requires a dialog between the ARTS and the host computer The dialog is as follows ASCII Y gt ASCII X eit O ASCII P Profile 0x01 or 0x02 M gt P R U 15 byte Profile defined below T T gt S z 1 byte checksum J Ack ASCII Y or Nack ASCII N r The 15 byte profile is Byte Meaning 1 Recording Frequency 2 Output Channel 1 Activation type 3 4 High Low byte Channel 1 Time Delay 5 6 High Low byte Channel 1 Altitude 7 8 High Low byte Channel 1 ADC Altitude 9 Output Channel 2 Activation type 10 11 High Low byte Channel 1 Time Delay 12 13 High Low byte Channel 1 Altitude 14 15 High Low byte Channel 1 ADC Altitude These are as follows 27 Recording Frequency This value defines how many samples per second are recorded and can be any of the following values 200 100 50 20 10 Activation Type This value defines which event will trigger the firing of the output channel and is defined as follows 0 Launch 1 MECO 2 Apogee 3 Specified Altitude Time Delay This value specifies an optional time delay that the ARTS will wait after the specified trigger event before it will fire the output channel This value is the number of 1 200ths of a second to delay Altitude This value is the altitude at which the output channel will trigger ADC Altitude
20. rometric Sensor Cal Low Byte 5 20 Current Flight Profile 21 GPS Status 22 CKSUM 23 Terminating lt CR gt Barometric Sensor Cal This is a 16 bit data field which contains the raw 10 bit ADC calibration value as measured by the ARTS during power up This value can then be used as the Zero Altitude value for this flight Convert this value to altitude using the formulas given in section 2 2 16 Current Flight Profile This is the flight profile selected for the current flight Its 16 byte structure is the same as used by DataAnalyzer to download the profile to the ARTS and is detailed in section GPS Status This gives the current status of a GPS unit attached to the ARTS It takes one of the following values 0x00 No GPS connected 0x01 GPS connected but no fix being reported 0x02 GPS connected and reporting a valid fix PreLaunch GPS Position Packet The pre launch GPS position packet is defined as follows Byte Meaning l Preceding lt CR gt 2 ID 0x02 3 25 22 bytes containing GPS position 26 CKSUM 27 Terminating lt CR gt The 22 bytes containing the GPS position are either the 22 bytes following the comma after the time in a GPGGA NMEA sentence or the 22 bytes following the first comma in a GPGLL sentence 17 Flight Status Packet The flight status packet is defined as follows
21. rotechnic charges as this may cause the premature firing of the charges Never arm the ARTS when connected to live pyrotechnic charges until the rocket is on the pad and in the firing position When fired the current on the output channels is 1 25 amps for 0 25 seconds This is sufficient for low current electric matches such as those made by Daveyfire and Oxral Other igniters may not work reliably or at all Don t assume that because it worked with another altimeter it will work with the ARTS Igniters can be tested by using the diagnostics panel in the DataAnalyzer program to fire the outputs The ARTS Flight Computer oe RI PULLLLELL ELEC CE St G Ozark Aerospace ARTS 8 This end up 6 1 Terminal Connector Connect to your computer using the supplied serial cable 2 GPS Connector Connect to an NMEA2 0 capable GPS to report your rocket s position over the telemetry 3 Programming header used during production to load firmware 4 AUX connector Expansion connector for future enhancements igniter expansion and telemetry are in production 5 Power switch connector 6 9V Battery connection be sure to note polarity marks on board 7 Option switches SW1 left selects flight profile 1 on or 2 off SW right selects flight data bank 1 on or 2 off 8 Output channel terminals Channel 1 Apogee Channel 2 Main ll Mounting the ARTS Select a location within
22. t Data Dump This command tells the ARTS to send its stored flight data Radio Test This command is used for setting up and testing the optional telemetry link When the ARTS receives this command it will key the transmitter and begin sending Ping Test Packets over the telemetry See section 1 11 for a description of these packets The packets will continue being sent over the telemetry link until any byte is sent to the ARTS term port This byte will be ignored it is just used as a signal to end the radio test Note that most transmitters have a transmit time out which will prevent them from continuously transmitting for longer than some set amount of time If you encounter this problem and need to continue the test simply send a byte to the ARTS to end the test and then re start it Fire Output Channel 1 This command will tell the ARTS to fire a squib attached to output channel 1 Apogee 24 Fire Output Channel 2 This command will tell the ARTS to fire a squib attached to output channel 2 Main Request GPS Status This command will tell the ARTS to report the status of a GPS attached to it Its possible responses are r nNG No GPS attached r nNF GPS attached but not reporting a fix If an attached GPS is reporting that it is fixed on a position 22 bytes will be sent containing the reported position The 22 bytes containing the GPS position are the 22 bytes following the comma after the time in
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