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WATSON INDUSTRIES DMS-SGP02 Owner's Manual

Dynamic measurement system, gyro system with gps module & dual antennas
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DYNAMIC MEASUREMENT SYSTEM
OWNER'S MANUAL
PART NUMBER: DMS-SGP02
Gyro System With GPS Module & Dual Antennas
WATSON INDUSTRIES, INC.
3035 MELBY STREET
EAU CLAIRE, WI 54703
Phone: (715) 839-0628
FAX: (715) 839-8248
email: support@watson-gyro.com
Watson Industries, Inc.
DMS-SGP02 Rev K 03/22/2018
1

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  • Page 1 DYNAMIC MEASUREMENT SYSTEM OWNER'S MANUAL PART NUMBER: DMS-SGP02 Gyro System With GPS Module & Dual Antennas WATSON INDUSTRIES, INC. 3035 MELBY STREET EAU CLAIRE, WI 54703 Phone: (715) 839-0628 FAX: (715) 839-8248 email: support@watson-gyro.com Watson Industries, Inc. DMS-SGP02 Rev K 03/22/2018...

  • Page 2: Table Of Contents

    Appendix C....................... 26 Watson Industries prides itself on solving customer problems and serving their needs in a timely fashion. This manual is intended to facilitate this goal and to provide written information about your product. We ask that you carefully read this manual.

  • Page 3: Introduction

    DMS via the RS-232 serial connection. Calibration is achieved by using the maintenance software to store data in non-volatile memory within the DMS. The DMS-SGP02 differs from a “standard” DMS with the addition of a Dual Antenna GPS System. This allows the DMS to output True North heading instead of relative heading.

  • Page 4: Installation

    GPS heading output will be. Unfortunately, with larger spacing values there is also an increased risk of signal reflections between GPS antennas that can degrade accuracy. Please Note: Adjustable antenna spacing was implemented for DMS-SGP02 sensors Rev I and later. Earlier models require a fixed value for spacing that is set at the factory.

  • Page 5: Calibration

    The message can be read by using a terminal program or by using the terminal mode of Watson Industries’ communication software. The DMS can also be “re-initialized” after it has been turned on. This is especially useful if the sensor has been used in severe maneuvers that have over-ranged the angular rate sensors and caused significant errors to accumulate.

  • Page 6: Special Operation Modes

    In this mode, the DMS will output sensor data normally unless it receives a valid command character. Once a command is received, the DMS will send data in response and await the next command. Using this mode, the user can retrieve the EEPROM map, adjust baud rates, adjust Watson Industries, Inc. DMS-SGP02 Rev K 03/22/2018...

  • Page 7: Interface

    The field is filled with asterisks when the data is invalid. (“*****”). The string is terminated by a carriage return. There will then be a short interval with no data transmission before the next string begins. Watson Industries, Inc. DMS-SGP02 Rev K 03/22/2018...

  • Page 8: Rs-232 Input Commands

    These commands are available to the user (others are used at the factory for alignment and calibration). An “R” or “r” will set the outputs (analog and serial) to their Reference Command modes, replacing the Inertial mode. This will also disable the logic input Reference Command and Watson Industries, Inc. DMS-SGP02 Rev K 03/22/2018...
  • Page 9 A “+” command will suppress or restore the transmission of data. This command will toggle the data transmission (On to Off; Off to On). Command mode is required for access to this command. Watson Industries, Inc. DMS-SGP02 Rev K 03/22/2018...

  • Page 10: Analog Outputs

    In an effort to make this system more versatile, the DMS allows the user to input analog data that can then be added to the serial data output. This allows the system to act as a data acquisition unit for other vehicle information such as engine RPM, engine temperature, fuel remaining, Watson Industries, Inc. DMS-SGP02 Rev K 03/22/2018...

  • Page 11: Speed Inputs

    Leave pin open if not in use. Ground to command. NOTE: The digital logic inputs are all disabled if any one equivalent serial command is sent via RS-232. This is to prevent hardware/software conflicts. Watson Industries, Inc. DMS-SGP02 Rev K 03/22/2018...

  • Page 12: Specifications

    Acquisition time for GPS units is typical for the contiguous United States. Acquisition time may differ due to interference in your geographic area. • Specifications are subject to change without notice. • This product may be subject to export restrictions. Export Classification ECCN 7A994. Watson Industries, Inc. DMS-SGP02 Rev K 03/22/2018...

  • Page 13: Figure2

    Figure2 Watson Industries, Inc. DMS-SGP02 Rev K 03/22/2018...

  • Page 14: Connections / Dimensions

    Z Axis Rate Analog Output No Connection • ** The user receives Power Ground & Signal Ground are electrically isolated • on this line. The signal ground is connected to case. FORWARD Figure 3 DMS-SGP02 Watson Industries, Inc. DMS-SGP02 Rev K 03/22/2018...

  • Page 15: Figure 4 Gps Antenna Dimensions

    Figure 4 GPS Antenna Dimensions Watson Industries, Inc. DMS-SGP02 Rev K 03/22/2018...

  • Page 16: Warning

    DISCLAIMER The information contained in this manual is believed to be accurate and reliable; however, it is the user’s responsibility to test and to determine whether a Watson Industries’ product is suitable for a particular use. Suggestion of uses should not be taken as inducements to infringe upon any patents.

  • Page 17: Customer Service

    Customer Service All repairs, calibrations and upgrades are performed at the factory. Before returning any product, please contact Watson Industries to obtain a Returned Material Authorization number (RMA). Return Address & Contact Information Watson Industries, Inc. 3035 Melby Street Eau Claire, WI 54703...

  • Page 18: Appendix A

    Note: The Ground Track Velocity field is filled with asterisks when the data is invalid. (“****.*”) Note: The Latitude & Longitude fields are filled with asterisks when the data is invalid. (“+**.***** +***.*****”). Note: The Altitude field is filled with asterisks when the data is invalid. (“*****”). Watson Industries, Inc. DMS-SGP02 Rev K 03/22/2018...
  • Page 19 3 is reset – not in Reference Mode bit 2 is reset - valid GPS true heading data bit 1 is reset - valid GPS ground track velocity data bit 0 is reset - valid GPS ground track heading data Watson Industries, Inc. DMS-SGP02 Rev K 03/22/2018...

  • Page 20: Activating Command Mode (Double Spacebar Mode)

    TO AVOID ANY OF THE FOLLOWING DATA ITEMS, PRESS N TO QUIT AND DISREGARD ANY OTHER DATA, PRESS Q *** DO YOU WANT TO PROCEED? (Y/N/Q) 4) To proceed type ‘Y’. Stop this process by typing either ‘N’ or ‘Q’. Watson Industries, Inc. DMS-SGP02 Rev K 03/22/2018...

  • Page 21: Setting Output Format

    1 = GPS TRUE NORTH HEADING (GPHDT GPS Message Required) 2 = RELATIVE HEADING 4) To set the heading mode to GPS True North Heading type ‘1’. To use this mode, the GPS antennas must be connected to the DMS. Watson Industries, Inc. DMS-SGP02 Rev K 03/22/2018...

  • Page 22: Setting Velocity Mode

    Enter the Antenna Spacing with up to three decimal places. Note: Input values outside the limit range are rejected (with ‘ENTRY EXCEEDS LIMITS - TRY AGAIN’ message) and the unit returns to the previous menu Watson Industries, Inc. DMS-SGP02 Rev K 03/22/2018...

  • Page 23: Setting Altitude Correction

    Note: The baud rate of the software that is communicating to the sensor will need to be changed to match the new setting. 5) Press the space bar to resume data transmission. The factory settings for serial communications are 9.6K baud with 8 bits and one stop bit, no parity. Watson Industries, Inc. DMS-SGP02 Rev K 03/22/2018...

  • Page 24: Appendix B

    The values of Forward, Lateral and Vertical Acceleration should remain at the values when level. Repeat the test for the roll axis of the sensor. Under this test, Y and Z acceleration will read 0.71G and the X acceleration will retain its value at level. Watson Industries, Inc. DMS-SGP02 Rev K 03/22/2018...
  • Page 25 100 °/sec limit. The sensor should then be rotated about the vertical and the Yaw output will respond accordingly. The test should then be repeated for the Roll axis. Watson Industries, Inc. DMS-SGP02 Rev K 03/22/2018...

  • Page 26: Appendix C

    Shift lower byte left once (to remove 1 bit space between bytes): Bank Elevation Heading X Rate Y Rate Z Rate 0x05 0x7E 0x70 0x03 0x7B 0x11 0x54 0x38 0x00 0x32 0x32 0x98 Watson Industries, Inc. DMS-SGP02 Rev K 03/22/2018...
  • Page 27 LSB as a 16 bit word. This word is then shifted left to shift out the 7th bit (always set to 1). What remains is a signed fractional word with a resolution of 13 bits plus a sign bit. Watson Industries, Inc. DMS-SGP02 Rev K 03/22/2018...
  • Page 28 For Angular Rates: Scale factor is: (200 ˚/sec) / 32768 counts X Accel Y Accel Z Accel X angular rate Y angular rate Z angular rate 0.0000g -0.2808g -0.9595g 9.985 ˚/sec -15.015 ˚/sec 54.980 ˚/sec Watson Industries, Inc. DMS-SGP02 Rev K 03/22/2018...
  • Page 29 LSB as a 16 bit word. This word is then shifted left to shift out the 7th bit (always set to 1). What remains is a signed fractional word with a resolution of 13 bits plus a sign bit. To convert binary data: Latitude Longitude Altitude Velocity 0x8FF9 0xE7F7 0xDFBD 0x9FF9 0x83BF 0x81A4 Watson Industries, Inc. DMS-SGP02 Rev K 03/22/2018...
  • Page 30 Shift all bytes for each parameter left once (to remove 1 bit space a top of high byte): Latitude Longitude Altitude Velocity 0x1F 0xBE 0x06 0x02 0xE7 0xF4 0xFC 0x90 0x3F 0xFF 0x70 0x90 Watson Industries, Inc. DMS-SGP02 Rev K 03/22/2018...
  • Page 31 = 894 ft For Velocity: Scale factor is 400kph / (2 ) 32768 counts = 656 counts * (400 kph /2 counts) = 8.007 kph Latitude Longitude Altitude Velocity 44.86403 -91.46668 894 ft 8.007 kph Watson Industries, Inc. DMS-SGP02 Rev K 03/22/2018...

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