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SBE 38 User Manual

Digital oceanographic thermometer with rs-232 or optional rs-485 interface
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SBE 38 Digital
Oceanographic
Thermometer
With RS-232 or optional RS-485 Interface
User's Manual
Sea-Bird Electronics, Inc.
th
1808 136
Place NE
Bellevue, Washington 98005 USA
Telephone: 425/643-9866
Fax: 425/643-9954
E-mail: seabird@seabird.com
Website: www.seabird.com
Manual Version #006, 03-14-03
Firmware Version 1.2 and later

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Summary of Contents for SBE 38

  • Page 1 SBE 38 Digital Oceanographic Thermometer With RS-232 or optional RS-485 Interface User’s Manual Sea-Bird Electronics, Inc. 1808 136 Place NE Bellevue, Washington 98005 USA Telephone: 425/643-9866 Fax: 425/643-9954 E-mail: seabird@seabird.com Manual Version #006, 03-14-03 Website: www.seabird.com Firmware Version 1.2 and later...
  • Page 2 Limited Liability Statement Extreme care should be exercised when using or servicing this equipment. It should be used or serviced only by personnel with knowledge of and training in the use and maintenance of oceanographic electronic equipment. SEA-BIRD ELECTRONICS, INC. disclaims all product liability risks arising from the use or servicing of this system.

  • Page 3: Table Of Contents

    Section 2: Description of SBE 38 ..............6 System Description ....................6 Specifications.....................7 Dimensions and End Cap Connector ..............8 Baud Rate and Cable Length ................8 Section 3: Preparing SBE 38 for Deployment ..........9 Installing Software.....................9 Power and Communications Test ..............9 Test Setup ....................9 Test ......................10 Section 4: Deploying and Operating RS-232 SBE 38........13...

  • Page 4: Section 1: Introduction

    Except from April to October, when we are on summer time (1500 to 0000 Universal Time) Quick Start Follow these steps to get a Quick Start using the SBE 38 with a standard RS-232 interface. The manual provides step-by-step details for performing each task: 1.

  • Page 5: Unpacking Sbe 38

    Section 1: Introduction Unpacking SBE 38 Shown below is a typical SBE 38 shipment. SBE 38 25-pin to 9-pin adapter I/O Cable with 9V battery snap connector and 9V battery SBE 38 Digital Oceanographic Thermometer Software, and Electronic Copies of...

  • Page 6: Section 2: Description Of Sbe 38

    AC bridge and platinum thermometer at a small fraction of the cost. The SBE 38 is unaffected by shock and vibration, has high accuracy and stability, and is easy to use. It has a rugged, corrosion-proof, 10,500 meter (34,400 foot) titanium pressure housing.

  • Page 7: Specifications

    = (0.133 * NAVG) + 0.339 RS-232 (standard): Note: 8 – 15 VDC at 10 milliamps average If the SBE 38 is sampling data External Power and the voltage is less than RS-485 half-duplex (optional): 6.5 volts for 10 consecutive 8 –...

  • Page 8: Dimensions And End Cap Connector

    RS-232 Transmit or RS-485 B Power Baud Rate and Cable Length For RS-232, the length of cable that the SBE 38 can drive for transmitting Note: real-time data is dependent on the baud rate. The allowable combinations are: Baud rate is set with the BAUD= command.

  • Page 9: Section 3: Preparing Sbe 38 For Deployment

    1. If applicable, remove locking sleeve and dummy plug from bulkhead connector: A. By hand, unscrew the locking sleeve from the SBE 38’s bulkhead connector. If you must use a wrench or pliers, be careful not to loosen the bulkhead connector instead of the locking sleeve.

  • Page 10: Test

    Select the instrument type (SBE 38) and the computer COM port for communication with the SBE 38. Click OK. 2. The main screen looks like this: Menus...
  • Page 11 — another program. *See Command Descriptions in Section 4: Deploying and Operating RS-232 SBE 38. 3. In the Configure menu, select SBE 38. The dialog box looks like this: Interface for communication between computer and Computer COM port, baud rate,...
  • Page 12 Automatically start sampling on power up Default interface is RS-232 6. Command the SBE 38 to take a sample by typing TS and pressing the Enter key. The display looks like this if the output format was set to converted data (FORMAT=C) with 4 digits to the right of the decimal place (DIGITS=4): 23.7658...

  • Page 13: Section 4: Deploying And Operating Rs-232 Sbe 38

    Apply power and establish communications. Set up SBE 38 to average 4 measurements per sample and output converted data with 3 digits after decimal place. Command SBE 38 to take a sample and send data to computer. (Apply power and then click Connect on Toolbar.) S>NAVG=4...

  • Page 14: Continuous Sampling

    Example: Continuous Sampling (user input in bold) Example 1 AUTORUN=N: Apply power and establish communications. Set up SBE 38 to average 4 measurements per sample and output converted data with 3 digits after decimal place. Set up to wait for a command when power is applied.

  • Page 15: Command Descriptions

    See Appendix IV: Command Summary for a summarized command list. When entering commands: • Input commands to the SBE 38 in upper or lower case letters and register commands by pressing the Enter key. • The SBE 38 sends ? CMD if an invalid command is entered.
  • Page 16 Section 4: Deploying and Operating RS-232 SBE 38 Sampling Commands Notes: • To capture real-time data to a file, These commands are used to request data from the SBE 38. do this before starting sampling: For all sampling commands: 1. Click Toolbar’s Capture button.

  • Page 17: Data Output Formats

    B. XSG Connector (shown in photo) - Install the cable connector, aligning the raised bump on the side of the connector with the large pin (pin 1 - ground) on the SBE 38. Remove any trapped air by I/O cable burping or gently squeezing the connector near the top and moving your fingers toward the end cap.

  • Page 18: Section 5: Routine Maintenance And Calibration

    Corrosion Precautions All exposed materials are titanium or plastic. No corrosion precautions are required, but direct electrical connection of the SBE 38 housing to mooring or other dissimilar metal hardware should be avoided. Rinse the SBE 38 with fresh water after use and prior to storage.

  • Page 19: Sensor Calibration

    Coefficients are then computed, which may be used with appropriate algorithms to obtain engineering units. The temperature sensor on the SBE 38 is supplied fully calibrated, with coefficients printed on the Calibration Certificate (see back of manual).

  • Page 20: Glossary

    SBE Data Processing can be used to view and process the entire data stream, including data from the SBE 38, when the SBE 38 is integrated with the SBE 21 or 45 thermosalinograph.

  • Page 21: Appendix I: Functional Description

    NR = output from reference resistor NT = thermistor output The SBE 38’s output is computed from the raw count and the calibration coefficients that are stored in EEPROM. The number of acquisition cycles (raw counts) averaged per measurement is user-programmable (NAVG= command;...

  • Page 22: Appendix Ii: Electronics Disassembly/Reassembly

    Appendix II: ? Appendix II: Electronics Disassembly/Reassembly 1. Remove the titanium end cap and electronics from the housing as follows: A. Wipe the outside of the end cap and housing dry, being careful to remove any water at the seam between them. B.

  • Page 23: Appendix Iii: Rs-485 Interface

    Example: Wake up all SBE 38s. Set up all SBE 38s to average 4 measurements per sample and output converted data with 3 digits to the right of the decimal place. Command all SBE 38s to take a sample and hold data in buffer, and then command each SBE 38 to transmit data from buffer.

  • Page 24: Command Descriptions

    S>IDREQ=N (global command to require ID prefix) (set number of A/D cycles to average for SBE 38, no ID required as part of command) S>NAVG=4 (verify setup with status command for SBE 38, no ID required as part of command) S>DS...

  • Page 25: All Other Commands

    All other commands (status, setup, sampling, and coefficients) are listed in Section 4: Deploying and Operating RS-232 SBE 38 and in Appendix IV: Command Summary. Notes on use of these commands for an SBE 38 with RS-485 interface: • Effect of IDREQ= command: If IDREQ=Y, precede these commands with #ii (ii = 0 –...

  • Page 26: Wiring

    Conversion of RS-232 to RS-485 or RS-485 to RS-232 Sea-Bird supplies the SBE 38 with the correct wiring from the I/O connector Notes: to the Printed Circuit Board (PCB) for your ordered configuration (standard • See Appendix II: Electronics RS-232 or optional RS-485).

  • Page 27: Appendix Iv: Command Summary

    Descriptions in Section 4: x= baud rate (1200, 2400, 4800, 9600, Deploying and Operating BAUD=x 19200, 38400). Default 9600. RS-232 SBE 38 for detailed information and examples. x=C: Output converted data (°C). FORMAT=x • See Appendix III: x=R: Output raw data (counts).

  • Page 28: Appendix V: Replacement Parts

    Placed in end cap groove for 30931 N674-70 watertight seal 4-pin RMG-4FS to 25-pin DB-25S I/O cable 801093 From SBE 38 (XSG) to computer with battery snap, 2.4 m (8 ft) long 4-pin MCIL4FS to 9-pin DB-9S I/O cable From SBE 38 (wet-pluggable) to 801206...

  • Page 29: Index

    Settings · 21 Software · 6 Format installation · 9 data output · 17, 25 Specifications · 7 Functional description · 21 System description · 6 Glossary · 20 Testing · 9 Limited liability statement · 2 Unpacking SBE 38 · 5...

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