User manual

Files Stored On the Flash Card
For the standard MMP configuration (with a CTD and an ACM installed), during each
profile, the system creates and stores three data files on the flash card (two of these are sensor
files, one each for the CTD and the ACM) and the third file is the engineering data which
includes all of a profile’s time tags. The data is stored as scaled integers to minimize storage
requirements. Each of the three values in a CTD record requires 3 bytes (9 bytes/record). Each
of the nine values in an ACM record requires 2 bytes (18 bytes/record). The quantities selected
for measurement and storage are discussed is this manual in Chapters 7 and 8, “User Interface”,
and “Data Offload, Processing, and Interpretation”. The scaling and offset values used to pack
and unpack the binary data can be found in the sensor manuals in the tool kit. The binary data
processors provided with the MMP translate data using these specific scaling and offset values.
The engineering data file time tags record the start and stop times for sensor data and
profiler motion, battery voltage, motor current, ambient pressure, and termination condition. The
information is stored in a coded binary form to reduce file size. These data files are described in
more detail in Chapter 7, “MMP User Interface” in the section titled “<7> Offload Deployment
Data”, and in Chapter 8, Data Offload, Processing, and Interpretation”.
The flash card also contains a system file called IRQ_XCPT.LOG, which records a time
history of interrupt requests (IRQs) and other exceptions sent to or detected by the TT8v2 during
the deployment. Other logged exceptions include the creation time of the file, critical handler
faults (low level problems detectable by the 68332 CPU, the critical handler places the system in
a controlled low power state until it is rebooted by the watchdog), and unattended resets (a reboot
by the watchdog after the 68332 CPU crashes and fails to acknowledge a watchdog IRQ).
The remaining files stored on the flash card are AUTOEXEC.BAT, the firmware (MMP-
N_NN.RUN) DEPLOY.DAT (deployment settings), PROFILES.DAT (profile count, which is
the number of the last profile of the deployment) and LASTSENT.DAT (used with the
Underwater Inductive Modem option).
AUTOEXEC.BAT is automatically executed by PicoDOS when power is applied to the
system or a reboot is executed. The MMP AUTOEXEC.BAT file calls the firmware, triggering
the transfer to RAM and subsequent execution of the program.
For MMP firmware, MMP-N_NN.RUN, N_NN is the version number, e.g.,
MMP-3_13.RUN.
Appendix B-4