CSIRO Marine Research Commonwealth Scientific and Industrial Research Organisation, Australia

The Devil An XBT Acquisition System with USB Interface Alex Papij and Lindsay Pender CSIRO Marine Research Castray Esplanade Hobart, Tasmania 7000 Australia

Background XBT recording system comprises a computer an acquisition and control program data acquisition hardware a launcher

CMR and BoM XBT Background - Issues - SIPPICAN MK9 Still in use Not supported by Sippican SIPPICAN MK12 Different versions exist, not all compatible Future support by Sippican?? ISA bus card, few pc’s had this slot SIPPICAN MK21 Not used by CMR or BoM ISA bus card, few pc’s had this slot

CMR and BoM XBT Background Sippican MK9 and MK12 XBT Systems - Issues - CMR and BoM software has to run under DOS neither the MK12 nor the MK21 can plug into a laptop style computer MK9 and MK12 require ISA slots – not available in modern desktop computers the computer has to be an older slow machine

The Devil Project Devil Project Objectives software to operate in a Windows 2000 environment multi-platform network or single PC operation suitable for Ship of Opportunity Program (SOOP) use (non-expert) climatology overlay and other QC use existing Sippican launcher support for MK9 hardware new hardware using USB interface to PC long term maintenance support

The Devil Project

Step 1:Develop the Devil software with Sippican MK9 control. This becomes the Devil 1 system. Step 2:Design the USB device + drivers, integrate Devil software. This becomes the Devil 2 system.

Concept and Structure

Client/Server model

For the Developer Client/Server model

For the Developer – Interfaces and Boundaries – Software socket boundary

For the Developer – Interfaces and Boundaries – Software socket boundary CONT hardware query->CONT XBT USB hardware detected CONT Configure USB XBT T >CONT USB XBT T7 is set up : : CONT Commence Launch->CONT Pass commence launch ->DATA :22: : : DATA format

For the Developer – Interfaces and Boundaries – Driver boundary

For the Developer – Interfaces and Boundaries – Driver boundary

For the Developer – Interfaces and Boundaries – Driver boundary The dll exposed functions that the developer uses are: int WriteToXBT(char* message, int* plen); int ReadFromXBT(char* message, int* plen);

Devil System Devil USB device circuit board

Devil System Devil 2 – SOOP version

Performance How does it perform? User interface Research vessel network environment Windows platform missing data issue Accuracy

Performance – User Side – Configuration – different levels of permissions

Performance – User Side – Different levels of permissions

Performance – User Side –

Performance – Real Time, No Missing Data – MK9 Check for missing data

Performance – Real Time, No Missing Data – Timing of Devil acquisition of MK9 data. sample interval sec:mean = sd = max – mean = max – mean =

Performance – Real Time, No Missing Data – Devil USB hardware: Devil Software uses similar techniques to access Devil USB as for the MK9 Devil USB device can buffer large amounts of data Software access to USB has no critical timing requirements

Sea Trials Summary of April 2002 sea trials Mean Temperature Offset (ºC) Mean Depth Offset (m) Mean Depth Stretch Devil USB ± ± ± Mk ± ± ± Mk ± ± ± XBT drops for the Devil USB system 22 XBT drops for the Mk 9 system 21 XBT drops for the Mk 12 system Each drop accompanied by a CTD cast

Issues to Resolve Power dissipation in the XBT thermistor Devil USB version 1 hardware was used in April 2002 trials. Devil USB version 2 hardware to be used in August 2003 trials.

Issues to Resolve Version 2 of Devil USB hardware: Revised analogue circuit Constant power dissipation in thermistor Lower noise Sea trials in August 2003

The Future Devil 1 system currently being deployed by BoM USB version 2 device sea trials in August USB devices to be delivered to BoM in 2003 for Devil 2 System deployment 5 USB devices to be delivered to CMR in 2003/2004 for Devil 2 System deployment Multi-auto launcher + Devil feasibility investigations

Acknowledgements Bureau of Meteorology: Ross Hibbins Graeme Ball Ross McKenzie CSIRO Marine Research: Erik Madsen

Acknowledgements The Tasmanian Devil

Sea Trials If viewed as a constant calibration error, then the USB has an error of about +/ ºC

The Future Power dissipation in the XBT thermistor Devil USB version 1 hardware was used in April 2002 trials. Devil USB version 2 hardware to be used in August 2003 trials.

Sea Trials