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Related Manuals for WATSON INDUSTRIES AHRS-S305
Summary of Contents for WATSON INDUSTRIES AHRS-S305
- Page 1 ATTITUDE AND HEADING REFERENCE SYSTEM OWNER'S MANUAL PART NUMBER: AHRS-S305 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 AHRS-S305 Rev J 03/22/2018...
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Page 2: Table Of Contents
Setting Baud Rate ..............................19 Appendix C..................................20 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
5G), the appropriate shock mounting should be used to prevent damage. Vibration isolation should be used for use in 2.5G or greater vibration environments. Symmetry is very important in such mount designs (consult Watson Industries for application notes on this if needed). -
Page 4: Environment
This system directly depends on the quality of the velocity signal. Delta Velocity Compensation: The compensation for forward acceleration is based on calculating the changes in average forward velocity. The result is subtracted from the vertical reference accelerometers for the pitch Watson Industries, Inc AHRS-S305 Rev J 03/22/2018... - Page 5 This is limited in unusual attitudes and the error correction system is locked out when the attitude and conditions are outside of a reasonable range. This system also directly depends on the quality of the velocity signal. Watson Industries, Inc AHRS-S305 Rev J 03/22/2018...
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Page 6: Specifications
This sensor will meet or exceed this spec within the 48 contiguous United States. • Specifications are subject to change without notice. • This product may be subject to export restrictions. Export Classification ECCN 7A994. Watson Industries, Inc AHRS-S305 Rev J 03/22/2018... -
Page 7: Rs-232 Output Format
±799.9 Km/hr. 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 AHRS-S305 Rev J 03/22/2018... -
Page 8: Rs-232 Input Commands
The RS-232 input commands are provided for the purpose of unit test and installation set-up. Use the same parameters that are used for the RS-232 output (9600 baud ASCII nominal, or as reset in the units EEPROM). Watson Industries, Inc AHRS-S305 Rev J 03/22/2018... - Page 9 (On to Off; Off to On). This change is made non-volatile in the unit on EEPROM by keying in the quote (“) character. Double spacebar at initialization Command mode is required for access to this command. Watson Industries, Inc AHRS-S305 Rev J 03/22/2018...
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Page 10: Analog Outputs
Analog Outputs Analog signals are output from a 14 bit digital to analog converter through an operational amplifier. Each analog output has a 300 ohm resistor in series to eliminate oscillations from high Watson Industries, Inc AHRS-S305 Rev J 03/22/2018... -
Page 11: Analog Inputs
80 KPH per volt. Forward motion should produce a positive signal with respect to signal ground. This input is on pin 22 of the 25 pin D-sub connector (the signal ground reference is pin 25). Watson Industries, Inc AHRS-S305 Rev J 03/22/2018... -
Page 12: Connections / Dimensions
23 - 24 No User Connection Analog Output 5 – Heading Rate Signal Ground Analog Output 6 – Roll Rate FORWARD CAUTION DELICATE INSTRUMENT HANDLE WITH CARE CAUTION DELICATE INSTRUMENT HANDLE WITH CARE AHRS-S305 Watson Industries, Inc AHRS-S305 Rev J 03/22/2018... -
Page 13: Warning
The non-magnetic connectors supplied with the unit must be used to preserve heading accuracy. The user must use non-magnetic hardware to install the unit. This unit should be protected against prolonged exposure to high humidity and/or salt air environments. Watson Industries, Inc AHRS-S305 Rev J 03/22/2018... - Page 14 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.
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Page 15: Customer Service
• Contact Information • Equipment Model Number • Equipment Serial Number • Description of Fault It is the customer’s responsibility to pay all shipping charges from customer to Watson Industries, including import and transportation charges. Watson Industries, Inc AHRS-S305 Rev J 03/22/2018... -
Page 16: Appendix A
South Heading Flag Bit 4 Reset No Velocity Error Bit 3 Reset No System Error Bit 2 Reset No Heading Error Bit 1 Reset No Elevation Error Bit 0 Reset No Bank Error Watson Industries, Inc AHRS-S305 Rev J 03/22/2018... - Page 17 Reset Velocity Enabled Bit 3 Reset Not in Reference Mode Bit 2 Reset Current System Time Constant = 010 Binary Value = 2; so Bit 1 (2+1) = 8 seconds Bit 0 Reset Watson Industries, Inc AHRS-S305 Rev J 03/22/2018...
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Page 18: Activating Command Mode (Double Spacebar Mode)
TO SET FOR OUTPUT FOR ANY OF THE FOLLOWING DATA ITEMS, PRESS Y 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) Watson Industries, Inc AHRS-S305 Rev J 03/22/2018... -
Page 19: Adjust Time Constants
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 AHRS-S305 Rev J 03/22/2018... -
Page 20: Appendix C
0x80 0x99 0x99 0xCC Remove the most significant bit from each byte: Bank Elevation Heading X Rate Y Rate Z Rate 0x05 0x7E 0x70 0x03 0x7B 0x11 0x2A 0x1C 0x00 0x19 0x19 0x4C Watson Industries, Inc AHRS-S305 Rev J 03/22/2018... - Page 21 For Angular Rates: Scale factor is: (200 ˚/sec) / 32768 counts Bank Elevation Heading X angular rate Y angular rate Z angular rate 14.985 ˚ -5.010 ˚ 315 ˚ 9.985 ˚/sec -15.015 ˚/sec 54.980 ˚/sec Watson Industries, Inc AHRS-S305 Rev J 03/22/2018...
- Page 22 Shift lower byte left once (to remove 1 bit space between bytes): X Accel Y Accel Z Accel X Rate Y Rate Z Rate 0x00 0x7E 0x79 0x03 0x7B 0x11 0x00 0x34 0xDC 0x32 0x32 0x98 Watson Industries, Inc AHRS-S305 Rev J 03/22/2018...
- Page 23 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 AHRS-S305 Rev J 03/22/2018...