1 Autosub Electronics and Data Processing James Perrett Ocean Engineering Division Southampton Oceanography Centre

2 Overview l The Electrical/Electronic Architecture l Distributed Software Architecture l Data Logging and Processing

3 Power System l Manganese Alkaline - 96V Nominal l Individual battery currents continuously monitored l Motor runs at raw battery voltage l All other systems on 48V or 24V bus l Most sub systems electrically isolated

4 Wiring Harness l One cable carries all connections required by most sub systems LONWorks data networkLONWorks data network 48V Power Supply48V Power Supply 24V Power Supply24V Power Supply

5 Electronic Hardware l Standard Types Analogue I/O nodeAnalogue I/O node Serial I/O nodeSerial I/O node LTM 10 (Flash programmable) nodeLTM 10 (Flash programmable) node RouterRouter HPSN based nodeHPSN based node l Specials Data logger (PC104 based)Data logger (PC104 based)

6 Network Configuration - Binding network output int nvo_1 network input int nvi_2 network input int nvi_3 network output int nvo_4

7 Data Logger l Event Driven Variables are recorded as they arriveVariables are recorded as they arrive l Scheduled Variables are polled at regular intervalsVariables are polled at regular intervals Output variables sent to telemetry systemsOutput variables sent to telemetry systems Files opened, closed and renamed.Files opened, closed and renamed. l Diagnostic Mode Data sent to serial port.Data sent to serial port. l Ethernet Network File Server

8 Background - Possible Changes l Reduce wiring harness complexity by standardising on 48V l Add ethernet to harness.