012105 - CSIRO Marine and Atmospheric Research
Contents
1. When all messages have been transmitted the cycle starts again at message no 1 Elapsed time since surfacing Te Te m 1 n r Where m message block number byte 03 of message 01 n total number of messages to transmit profile r repetition rate Total number of messages n is described in section IV b or may be determined from the ARGOS data Note n may be less than specified in user manual if the float is operating in shallow water causing reduced profile length Repetition rate r is the time interval between ARGOS transmissions This value can be determined from section V or from the ARGOS data Approximate time of surfacing Subtracting Te from the ARGOS time stamp can determine approximate time of surfacing Example Below is message 01 in DS format 2001 11 02 22 47 54 1 CF 01 05 02 AF 02 2F 00 85 01 01 01 16 92 17 19 9E 94 01 AD 85 09 1F 48 97 9B 00 46 62 24 0E m message block number byte 03 5 n total number of messages to transmit profile 11 17 r repetition rate 62 seconds Te elapsed time since surfacing m 1 n r 5 1 11 62 s 2728 s 00h 45m 28s Approximate time of arrival at surface ARGOS time stamp Te 22 47 54 00 45 28 22 02 26 Total time spent at surface transmitting Tsurf This is determined by subtracting ascent time from UP time Tsurf UP time hr bottom pressure ascent rate 0 08 dbar s 3600 Bottom pressure is telemetered2. 280 59 60 8 1300 34 270 60 55 9 1200 35 260 61 50 10 1100 36 250 62 45 11 1000 37 240 63 40 12 900 38 230 64 35 13 800 39 220 65 30 14 700 40 210 66 25 15 650 41 200 67 20 16 600 42 190 68 15 17 550 43 180 69 10 18 500 44 170 70 7 19 480 45 160 71 4 or surf 20 460 46 150 21 440 47 140 22 420 48 130 23 400 49 120 24 380 50 110 25 360 51 100 26 350 52 95 The SeaBird CTD is not sampled at zero pressure to avoid pumping the cell dry and or ingesting surface oil slicks The shallowest profile point is taken at either 4 dbar or at the last recorded surface pressure plus 5 dbar whichever value is larger C TEST MESSAGE FORMAT The test message is sent whenever an I2 command is given the six transmissions during the startup cycle and during the six hour surface mode period prior to the first dive Each test message has 31 Bytes in hex unless otherwise noted with the following format Byte 01 CRC described in section C 02 Message block number begins as 1 and increments by one for every ARGOS message 03 amp 04 Serial number identifies the controller board number This may not be the same as instrument number 05 amp 06 Time from start up in two second intervals Hex 07 Flag 2 byte 08 amp 09 Current pressure centibar 10 Battery voltage 11 Current Bladder pressure in counts 12 Flag 1 Byte 13 Up time in hours 14 amp 15 Down time in hours 16 amp 17 Pa
3. as bytes 7 amp 8 of message 02 Example For bottom pressure of 2000 dbar and UP time of 18 hours Tsurf 18 hr 2000 0 08 3600 11 hr 18 APPENDIX D Argos ID formats 28 bit and 20 bit In 2002 Service Argos notified its users there were a limited number of 20 bit Ids available and to begin preparing for a transition to 28 bit IDs The 28 bit IDs reduced from 32 to 31 the number of data bytes in each message Data provided by Argos will consist of 31 hex bytes per message Data acquired by use of an uplink receiver will consist of 32 hex bytes per message The first byte when using an uplink receiver is a 28 bit ID identifier used by Argos and is not represented in the Apex Data formats included in this manual APPENDIX E Storage conditions For optimum battery life storage temperature range is 10 to 25 degrees C When activated the floats should be equilibrated at a temperature between 2 and 54 degrees C If optional VOS or aircraft deployment containers are used these must be kept dry and should be stored indoors only APPENDIX G Returning APEX for factory repair or refurbishment Contact WRC before returning APEX floats for repair or refurbishment All returns from outside USA please specify our import broker Logan International Airport Boston c o DHL Danzas Freight Forwarding Agents Phone 617 886 5605 FAX 617 241 5917 500 Rutherford Avenue Charlestown MA 02129 Note on shipping documents US MADE GO
4. if float contacts sea floor 4 Hold provided magnet at RESET position marked on for several seconds then remove magnet Note Magnetic switch must be activated held for at least one second to reset the instrument This is to provide a safety against accidental reset during transport Thus if the float does not respond as below the instrument was probably not reset 5 The air pump will operate for 1 second 6 The PTT will transmit 6 times at 6 second intervals Place ARGOS receiver beeper close to antenna to detect transmissions 7 The piston pump will begin to operate The piston will move to the retracted Storage Position if not already there pause 2 seconds and then move to full extension 8 The oil bladder will expand this should take 15 25 minutes 9 After the piston pump stops PTT will transmit at specified ARGOS rate 10 At every PTT transmission the air pump will turn on for 6 seconds until the air portion of the bladder has been inflated The pump should turn on 8 10 times 11 6 hours after reset transmissions will cease the bladder will deflate and the piston pump will retract the profiler begins its programmed mission 12 Reminder replace black rubber plug in cowling hole before deployment During self test the controller checks the internal vacuum sensor If the internal pressure has increased above a preset limit i e hull leakage caused loss of vacuum the instrument will not pump If y
5. order to use this instrument safely as so provided Personnel with knowledge and training to deal with this risk should seal or operate the instrument Webb Research Corp disclaims liability for any consequences of combustion or explosion II Reset and Self Test Profilers are shipped to the deployment site in Hibernate mode Shortly before deployment reset the profiler by passing a magnet over the marked location on the pressure case The profiler will run a self test transmit for 6 hours with the bladder extended and then begin its pre programmed mission The six ARGOS transmissions during self test and the transmissions during the initial 6 hour period contain data about the instrument and are outlined in V ARGOS DATA part C TEST MESSAGE FORMAT Procedure 1 Secure float in horizontal position using foam cradles from crate IMPORTANT Remove plastic bag and three plugs from CTD sensor if they j have not already been removed O k 2 Minimum temperature 2 deg C If necessary let float warm indoors before proceding 3 Carefully remove black rubber plug from bottom center of yellow cowing to verify bladder inflation per below Use fingers only tools may puncture bladder Be sure to replace plug before deployment Note it can be very difficult to replace plug when air bladder is fully inflated Replace plug during beginning of air bladder inflation Purpose of plug is to prevent silt entry
6. 5 Initial piston extension INSTRUMENT 1689 APEX version 07 29 04 sn 2029 028 038 3654779 ARGOS ID number 044 seconds repetition rate 225 hours DOWN 015 hours UP 1000 d bar park pressure P1 085 park piston position P2 012 ascent rate correction P3 100 storage piston position P4 251 piston full extension P5 2000 d bar profile pressure P6 025 profile piston position P7 115 OK vacuum count P8 009 ascend time intervals P9 145 air bladder pressure PB 001 deep profile count PD 025 Initial piston extension 13 Appendix A Flag Byte Description Two memory bytes are used one bit at a time to store 16 different bits of program flow information Both of these bytes are telemetered in the test messages sent at startup and for the initial 6 hour surface period Only flag byte 2 is sent in the data messages as part of message number Bit one is set for each deep profile and bit 8 is set each time the last SBE sensor value used an arithmetic round up Below is a list of what each bit in each byte signifies bit Flag 2 byte 1 Deep profile 2 Pressure reached zero 3 25 minute NextP timeout 4 Piston fully extended 5 Ascend timed out 6 Test message at turn on 7 Six hour surface message 8 Seabird string length error bit Flag 1 byte 1 Trip interval time 2 Profile in progress 3 Timer done 2 min bladder deflate time 4 UP DOWN 5 Arithmetic round up 6 Measure battery while pumping 7 Piston motor running 8 N
7. NDIX B CRC ALGORITHM IN BASIC FOR 28 BIT ID ccsssssssssssssessesesversesersesessersesesserseseseens APPENDIX C SURFACE ARRIVAL TIME AND TOTAL SURFACE TIME cscsssssssssssessssesseseeeees APPENDIX D ARGOS ID FORMATS 28 BIT AND 20 BIT 0 csssssssscsscsssescssenssscsnsecessssseessssnessssnesseses APPENDIX E STORAGE CONDITIONS cscsssssesssssssessssessersessssessesessessesessersesessessesessessesersesessessesesseseers APPENDIX G RETURNING APEX FOR FACTORY REPAIR OR REFURBISHMENT cscessseees APPENDIX G CTD CALIBRATION AND BALLASTING RECORDG ccsssssssssssssessesessersesessersesesners I ALKALINE BATTERY WARNING The profiler contains alkaline D cells There is a small but finite possibility that batteries of alkaline cells will release a combustible gas mixture This gas release generally is not evident when batteries are exposed to the atmosphere as the gases are dispersed and diluted to a safe level When the batteries are confined in a sealed instrument mechanism the gases can accumulate and an explosion is possible Webb Research Corp has added a catalyst inside of these instruments to recombine Hydrogen and Oxygen into H2O and the instrument has been designed to relieve excessive internal pressure buildup by having the upper end cap release Webb Research Corp knows of no way to completely eliminate this hazard The user is warned and must accept and deal with this risk in
8. ODS 19 APPENDIX G CTD Calibration and Ballasting records provided with hard copy only 20
9. Webb Research Corporation 82 Technology Park Drive E Falmouth MA 02536 4441 508 548 2077 FAX 508 540 1686 USER MANUAL APEX SBE PROFILER APEX SBE INSTRUMENTS Serial numbers 1684 1689 WRC Job no 947 CSIRO Manual rev 01 21 05 Software Rev 07 29 04 Data message format 28 Park and Profile with 28 bit ID W ice detection IT ALKALINE BATTERY WARNING cscsssssssssssssessesssssssessssessessssessessssessessrsssesessessssessessssesseserseseesers TT RESET AND SELF TEST niiina iiiaae iai a ii s a aeiia a iiS HL UNK KN IV PARK AND PROFILE FEATURE cccsssssssssssssssesscssssessessssessessnsessessssessessssessessssessessssessesesseseesers Ve ICE DETECTION FEATURE scsssssssesssssrsesscssrsessessrsesscssrsensesersessesensssessnsessesensesseseseessesensesscsssseses VI ARGOS DATA ccssssrssssrserssssrsessssrsesscssnsesscssnsensesersessessssesscsensessesensessesensesecsensessesensesscsensnsessensesecsenees SERVICE ARGOS PARAMETER S r e e eree a pee aeea Ee E EREN EREE a ipae En DATA FORMAT 28 28 BIT ID FORMAT W ICE DRTECTION TEST MESSAGE FORMAT stees E EE E E EE eege TELEMETRY ERROR CHECKING CRCH CONVERSION FROM HEXADECIMAL TO USEFUL UNITS scccccccccecsesseeeceeececsesseaececececsessaeceecescsensaeeeeeeeeeeneas VII MISSIONS E E E E T E ET E OE TE SEKR APPENDIX A FLAG BYTE DESCRIPTION csssssssssssssssssessssessessesssessesessersesessessesessessesessersesesessesersees APPE
10. X version 07 29 04 sn 2026 028 038 365474C ARGOS ID number 044 seconds repetition rate 225 hours DOWN 015 hours UP 1000 d bar park pressure P1 085 park piston position P2 012 ascent rate correction P3 100 storage piston position P4 246 piston full extension P5 2000 d bar profile pressure P6 025 profile piston position P7 115 OK vacuum count P8 009 ascend time intervals P9 145 air bladder pressure PB 001 deep profile count PD 025 Initial piston extension INSTRUMENT 1687 APEX version 07 29 04 sn 2027 028 038 365475F ARGOS ID number 046 seconds repetition rate 225 hours DOWN 015 hours UP 1000 d bar park pressure P1 085 park piston position P2 012 ascent rate correction P3 100 storage piston position P4 244 piston full extension P5 2000 d bar profile pressure P6 025 profile piston position P7 115 OK vacuum count P8 009 ascend time intervals P9 145 air bladder pressure PB 001 deep profile count PD 025 Initial piston extension INSTRUMENT 1688 APEX version 07 29 04 sn 2028 028 038 365476A ARGOS ID number 046 seconds repetition rate 225 hours DOWN 015 hours UP 1000 d bar park pressure P1 085 park piston position P2 012 ascent rate correction P3 100 storage piston position P4 250 piston full extension P5 2000 d bar profile pressure P6 025 profile piston position P7 115 OK vacuum count P8 009 ascend time intervals P9 145 air bladder pressure PB 001 deep profile count PD 02
11. alue Y Convert Y to decimal dec_Y dec_Y 1 1000 1 degrees C The 5 most significant salinity digits are telemetered The 6 digit salinity number is rounded up and converted to hex 36 8286 rounds to 36 829 and converts to 8FDD 11 Vil MISSIONS This section lists the parameters for each float covered by this manual The parameter listing appears when the float is RESET while connected to a terminal INSTRUMENT 1684 APEX version 07 29 04 sn 2024 028 038 3654726 ARGOS ID number 046 seconds repetition rate 225 hours DOWN 015 hours UP 1000 d bar park pressure P1 085 park piston position P2 012 ascent rate correction P3 100 storage piston position P4 251 piston full extension P5 2000 d bar profile pressure P6 025 profile piston position P7 115 OK vacuum count P8 009 ascend time intervals P9 145 air bladder pressure PB 001 deep profile count PD 025 Initial piston extension INSTRUMENT 1685 APEX version 07 29 04 sn 2025 028 038 3654735 ARGOS ID number 044 seconds repetition rate 225 hours DOWN 015 hours UP 1000 d bar park pressure P1 085 park piston position P2 012 ascent rate correction P3 100 storage piston position P4 250 piston full extension P5 2000 d bar profile pressure P6 025 profile piston position P7 115 OK vacuum count P8 009 ascend time intervals P9 145 air bladder pressure PB 001 deep profile count PD 025 Initial piston extension INSTRUMENT 1686 APE
12. amp 16 T2 14 amp 15 P6 15 amp 16 P11 17 amp 18 S2 16 amp 17 T7 17 amp 18 112 19 amp 20 P2 18 amp 19 S7 19 amp 20 S12 21 amp 22 T3 20 amp 21 P7 21 amp 22 P12 23 amp 24 S3 22 amp 23 T8 23 amp 24 T13 25 amp 26 P3 24 amp 25 S8 25 amp 26 S13 27 amp 28 T4 26 amp 27 P8 27 amp 28 P13 29 amp 30 S4 28 amp 29 T9 29 amp 30 T14 31 Half P4 30 amp 31 S9 31 Half S14 Sampling continues as shown above relevant to the number of depth table points sampled After the last data point in last message a Hex value of FFFF will fill remaining bytes Tp Sp and Pp are Park Temperature Salinity and Pressure values Pets surface Pressure rr T S and P are Temperature Salinity and Pressure values APEX records a profile during ascent ie upcast Bottom pressure may change due to several causes such variation of insitu density internal waves float grounding in shallows change of float mass etc APEX automatic depth adjustment will compensate in most but not all cases The number of sample points taken is proportional to depth as per sample depth table below The first i e deepest sample is taken at the first point in the depth table above bottom pressure Depth Table No 38 Sample Pressure Sample Pressure Sample Pressure Point dbar Point dbar Point dbar Bottom 1 2000 27 340 53 90 2 1900 28 330 54 85 3 1800 29 320 55 80 4 1700 30 310 56 75 5 1600 31 300 57 70 6 1500 32 290 58 65 7 1400 33
13. egative SBE number The flag bytes are transmitted as two hex characters with four bits of information encoded in each character Each hex character can have one of 16 different values as shown in the following table 1 U 0000 10 9 1001 2 1 0001 11 A 1010 3 2 0010 12 B 1011 4 3 001l 13 C 1100 5 4 0100 14 D 1101 6 5 0101 15 E 1110 7 6 0110 16 F 1111 8 7 Olli 9 8 1000 Bit 8 is the most significant bit and bit 1 is the least significant bit in the byte 14 As an example if a deep profile ended with the piston fully extended and ascend had timed out then bits 1 4 and 5 would be set in the termination byte This binary pattern 0001 1001 would be transmitted as the two hex characters 19 As another example if a regular profile ended with the piston fully extended and the 25 minute next pressure had timed out then bits 3 and 4 would be set in the termination byte This binary pattern 0000 1100 would be transmitted as the two hex characters OC 15 Appendix B CRC Algorithm in BASIC for 28 bit Id Below is a sample program in BASIC to calculate the CRC value for a message This program can be provided upon request in Basic Fortran or C DECLARE FUNCTION CRC INQ AS INTEGER N AS INTEGER CRC routine to check data validity in ARGOS message Bathy Systems Inc RAFOS Float data transmission 3 December 1990 The 1st of 31 bytes in an ARGOS message is the CRC The function CRC will compute CRC for byte 2 t
14. epth park depth Terminology PARK intermediate depth at which the float drifts PROFILE maximum depth to which the float descends before profiling up DOWN time spent during descent and at park depth UP time includes ascent and time at surface Ascent rate approximately 08 meters per second Total Up time is typically set to 12 to 20 hours increasing proportional to depth and amount of data to be transmitted per profile Another factor is deployment location due to the polar orbit of ARGOS the number of passes per day increases at high latitudes DOWN time D Surface E P Park T H Profile TIME Parameter PD determines the frequency of deep profiles Schematic examples PD 2 ma deep profile every 2 cycle deep profile every cycle V Ice detection feature 1 The median of 7 near surface temperature points 50 45 40 35 30 25 20 db is calculated If the median is less than 1 79 C there is a high probability of ice so ascent is aborted and the profile data are discarded The next profile will occur on the same schedule and the profile number byte 06 of message one will increment for each ascent regardless of whether or not the abort occurs If a profile has been aborted due to ice detection byte 17 of message one will increment by one for each occurrence 2 If ASCEND TIME P9 expires before pressure has reached the surface pressure and current T lt 1 79 C one sample then abort If T
15. file count 18 Air bladder pressure measured in counts approximately 148 counts 19 amp 20 Park temperature sampled just before instrument descends to target depth 21 amp 22 Park salinity sampled just before instrument descends to target depth 23 amp 24 Park pressure sampled just before instrument descends to target depth 25 Park battery voltage no load 26 amp 27 Surface Pressure as recorded just before last descent with an offset of 5 dbar 28 Internal vacuum measure in counts approximately 101 counts 29 Park piston position 30 Sbe Pump Voltage 31 SBE pump current Format for message number 2 and higher Byte OI1CRC described in section C 02 Message number 03 to 31 6 bytes in sequence and continuing in the next message 2 bytes temperature 2 bytes salinity 2 bytes pressure Note byte pairs will split between messages For instance byte 31 of message 2 will contain half of the byte pair for the 5 pressure sample The other half pressure byte will appear in byte 3 of message 3 See chart below Message Format and Sampling Depths BTYE MSG 2 BIYE MSG 3 BTYE MSG 4 3 amp 4 _ Profile T 3 Half P4 3 amp 4 P9 5 amp 6 ProfieS 4 amp 5 T5 5 amp 6 T10 7 amp 8 ProfileP 6 amp 7 S5 7 amp 8 S10 9 amp 10 T1 8 amp 9 P5 9 amp 10 P10 11 amp 12 S1 10 amp 11 T6 11 amp 12 T11 13 amp 14 P1 12 amp 13 S6 13 amp 14 S11 15
16. gt 1 79 C the float will go to maximum buoyancy condition and attempt to surface Ascend time is typically set to 150 200 of expected time required for ascent at 0 08 m s A standard float goes to maximum buoyancy when ascend time expires This feature is intended to ensure that the float reaches the surface in locations with unusual near surface stratification VI ARGOS DATA A SERVICE ARGOS PARAMETERS The user must specify various options to Service ARGOS These choices depend on how the user wishes to receive and process data Typical parameters are listed below Standard location Processing Type A2 pure binary input hexadecimal output Results Format DS all results from each satellite pass Uncompressed Distribution Strategy Scheduled all results every 24 hours Number of bytes transmitted 31 per message Note Webb Research strongly recommends all users to use ARGOS Multi Satellite Service which provides receptions from 3 satellites instead of 2 for a small incremental cost Using Argos 28 bit ID Format 31 data bytes are transmitted in each message With 20 bit ID Format each message had 32 data bytes see Appendix D for more information B Dat dep DATA FORMAT 28 28 bit ID format w ice detection a are sent via ARGOS in 31 byte hex messages The number of 31 byte messages sent ends on the programmed quantity of temperature measurements per profile See appendix D Fo
17. hrough 31 Hasard is used for Random because Random is reserved by BASIC Stored as file CRC in C RAFOS RAF11 DECLARE SUB Hasard ByteN AS INTEGER DEFINT A Z DIM in 31 AS INTEGER RAF11F message number 08 HEX ID 11502 01 02 93 CRC is O K A d802075d87c64e 15078 187c64c 1 f07b287c74a3007ce87c6483f07fe87c246 N 31 FORI 1toN in l VAL amp H MID A 2 I 1 2 NEXT I PRINT in 1 CRCGnQ N FUNCTION CRC INQ AS INTEGER N AS INTEGER STATIC DIM ByteN as INTEGER L ByteN in 2 DO CALL Hasard ByteN I I 1 ByteN ByteN XOR ro LOOP UNTIL I N CALL Hasard ByteN CRC ByteN END FUNCTION DEFINT A Z SUB Hasard ByteN AS INTEGER STATIC x 0 IF ByteN 0 THEN ByteN 127 EXIT SUB IF ByteN AND 1 1 THEN x x 1 IF ByteN AND 4 4 THEN x x 1 IF ByteN AND 8 8 THEN x x 1 IF ByteN and 16 16 THEN x x 1 IF X AND 1 1 THEN ByteN INT ByteN 2 128 ELSE ByteN INT ByteN 2 END IF END SUB 16 Appendix C Surface arrival time and total surface time Some users may wish to determine surface arrival time and total surface time in order to calculate drift vectors Although each 31 byte message is time stamped by ARGOS there may not be a satellite in view when the float surfaces When the float surfaces ie detects surface pressure recorded before last descent it will begin ARGOS telemetry Messages are transmitted in numerical order starting with message no 1
18. orrupted and should be deleted before further data processing Appendix B lists a sample program in BASIC to calculate the CRC value for a message This program can be provided upon request in Basic Fortran or C E Conversion from hexadecimal to useful units The pressure is measured every 6 seconds Temperature salinity and pressure are measured and stored at each point in the depth table Two hex bytes are stored for each sensor The decimal numbers from the STD sensors are converted to hex for compression in the ARGOS transmission as follows Temperature 5 digits 1 milli degree resolution Salinity 5 digits 001 resolution Pressure 5 digits 10 cm resolution To convert the hex ARGOS message back to decimal numbers hex 3 der converted units Temperature 3EA6 gt 16038 16 038 C Temperature F58B gt 02677 2 677 C Salinity 8FDD gt 36829 36 829 Pressure 1D4C gt 7500 750 0 decibars Current 0A gt 10 130 mA Volts 99 gt 153 15 7 volts Voltage V counts 10 A counts is in decimal number nominally 15 V and decreasing Current mA counts 13 counts is in decimal number Vacuum inHg counts 0 209 26 23 counts is in decimal number nominally 5 inHg Note regarding negative temperatures T C lt 0 Positive temperature range is 0 to 62 535C 0 to F447 hex Negative temperature range is 0 001 to 3 000C FFFF to F448 hex If hex value gt F448 then compute FFFF hex v
19. ou do not detect the 6 test transmissions and if the bladder does not inflate then the self test has failed and the instrument should not be deployed Deployment RESET instrument SELF TEST starts automatically see above When piston pump stops air pump inflates external bladder is full PTT will transmit for 6 hours at ARGOS Repetition rate intervals Typical repetition rate is 90 seconds or less Programmed repetition rate can be found in the Missions section of this manual If the repetition rate is 120 seconds the controller is not communicating properly with the CTD and the float should not be deployed Six hours after reset the piston pump will retract and bladder will deflate Deploy before this time is up or reset the instrument again to re initialize the 6 hour period The purpose is to have the instrument on the surface and receive test transmissions Pass a rope through the hole in the damper plate Holding both ends of doubled up rope carefully lower the float into the water Do not let rope slide through hole in disk this may cut the plastic disk Take care not to damage the antenna Do not leave the rope with the instrument release one end and retrieve the rope The float will remain on the surface until the 6 hour interval has expired Iv PARK and PROFILE Feature APEX floats with park and profile feature can be set to profile from a maximum depth profile depth after a given number of profiles from a shallower d
20. rk pressure centibar 18 Park piston position in counts 19 Depth correction factor in counts 20 Storage piston position in counts 21 Fully extended piston position in counts 22 amp 23 Profile pressure centibar 24 Profile piston position in counts 25 OK vacuum count at launch in counts 26 Ascend time in intervals 27 Target bladder pressure in counts 28 Deep profile cycle counts 29 Month software version number in decimal 30 Day software version number in decimal 31 Year software version number in decimal Flag 2 byte 1 Deep profile Rlag 1 byte 1 Trip interval time 2 Pressure reached zero 2 Profile in progress 3 25 minute Next Pressure timeout 3 Timer done 4 piston fully extended before surface 4 UP DOWN 5 Ascend time out 5 Data entry error 6 Test message at turn on 6 Measure battery 7 Six hour surface message 7 Piston motor running 8 Seabird String length error 8 Negative SBE number 10 D Telemetry error checking CRC Because ARGOS data contains transmission errors the first byte of each message contains an error checking value This value is a Cyclic Redundancy Check CRC and is calculated as a function of the message content bytes 2 to 32 For each message calculate a CRC value Compare the calculated CRC to the transmitted CRC byte no 2 Ifthe calculated and transmitted CRC values are not equal the message has been c
21. rmat for message number only Byt e 01 CRC described in section C 02 Message number Assigned sequentially to each 32 byte message Total number of messages per profile is shown below Messages are transmitted in sequential order starting with 1 and incrementing by one for the data set 03 Message block number begins as and increments by one for every ARGOS message data set This combined with the ARGOS repetition rate section VI allows the user to track surface drift Byte 03 will roll over at 256 and will reset to 1 on each new profile 04 amp 05 Serial number identifies the controller board number This may not be the same as instrument number 06 Profile number begins with 1 and increases by one for every float ascent 07 Profile length is the number of six byte STD measurements in the profile Total number of bytes of STD data from each profile depends on the sampling strategy chosen 08 Profile termination flag byte 2 see section D 09 Piston position recorded as the instrument reaches the surface 10 Format Number identifier for message one type 11 Depth Table Number identifier for profile sampling depths 12 amp 13 Pump motor time in two second intervals multiply by 2 for seconds 14 Battery voltage at initial pump extension completion 15 Battery current at initial pump extension completion one count 13 mA 16 Profile piston position park and profile floats only 17 Ice detected aborted pro
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