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Summary of Contents for WATSON INDUSTRIES ARS-G152
- Page 1 Angular Rate Sensor Owner’s Manual PART NUMBER: ARS-G152 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. ARS-G152 Rev A 05/02/2019...
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Page 2: Table Of Contents
Appendix C.2 Three Byte Binary Data Format......................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
Product Description The Watson Industries angular rate gyro is a solid state, single axis angular rate sensor. The gyro provides a voltage proportional to the rate of turn about its sensitive axis. During rotation, positive voltage output occurs in the direction of the rotational arrow indicated in figure 2. -
Page 4: Calibration
RS-232 serial link. This message gives information about the Gyro such as the full model number, serial number, and firmware revision. The message can be read by using a terminal program or by using the terminal mode of Watson Industries’ communication software. Interface RS-232 Output Format The standard RS-232 output is received from the 12-pin connector. -
Page 5: Rs-232 Input Commands
A “:” command will toggle the output to send a frame of data upon receiving any non- command character (On to Off; Off to On). This change is made non-volatile in the unit on Watson Industries, Inc. ARS-G152 Rev A 05/02/2019... - Page 6 This will not happen in the decimal or hexadecimal modes because command characters recognized by the system are not produced in those modes. Watson Industries, Inc. ARS-G152 Rev A 05/02/2019...
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Page 7: Analog Outputs
This output is Low (ground) when a fault is indicated. Flag reset is normal operation. The fault condition is set if the Angular Rate sensor has failed or the sensors temperature range has been extended. Watson Industries, Inc. ARS-G152 Rev A 05/02/2019... -
Page 8: Specifications
3.0 x 7.1 x 3.0 (cm) Weight: 2.1 oz 60 grams Connection: Amp 4-794627-2 (12 pin) • Specifications are subject to change without notice. • This product may be subject to export restrictions. Export Classification ECCN 7A994 Watson Industries, Inc. ARS-G152 Rev A 05/02/2019... -
Page 9: Connections
+Vin Power +8 to +45 VDC) The RS-232 serial and analog output connections are referenced to Signal Ground on pin 8. The power ground is already connected internally to the signal ground. Dimensions Figure 2 Watson Industries, Inc. ARS-G152 Rev A 05/02/2019... -
Page 10: 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 11 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 12 Unused Unused If set, Unit is in Initialization Unused If set, Command Mode is Selected Unused Example: The Status channel output in ASCII Decimal is “120 Octal Digit Binary Equivalent Status Bit # Watson Industries, Inc. ARS-G152 Rev A 05/02/2019...
- Page 13 This translates into the information below: Bit 7 Reset Bit 6 Reset Bit 5 Bit 4 Rate Sensor Failure Bit 3 Reset Temp Sensor in range Bit 2 Reset Bit 1 Reset Bit 0 Reset Watson Industries, Inc. ARS-G152 Rev A 05/02/2019...
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Page 14: 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. ARS-G152 Rev A 05/02/2019... -
Page 15: Appendix B.2 List Output Channels
3) Changes made will not change the non-volatile settings. To make these new settings the default value, send a Quotation Mark (“). 4) Press the space bar after quitting or updating the output range to restart the data flow. Watson Industries, Inc. ARS-G152 Rev A 05/02/2019... -
Page 16: Appendix B.4 Set Output Bandwidth
2 = TWO BYTE BINARY OUTPUT FORMAT 2) To change the binary output format to three byte, type ‘1’. To change the binary output format to two byte, type ‘2’. See Appendix C for more information binary formatting. Watson Industries, Inc. ARS-G152 Rev A 05/02/2019... -
Page 17: Appendix B.6 Set Baud Rate
3) Press the space bar to resume data transmission. Note: The factory settings for serial communications are 9.6K baud with 8 bits and one stop bit, no parity. Watson Industries, Inc. ARS-G152 Rev A 05/02/2019... -
Page 18: Appendix C Binary Output Format
1). What remains is a signed fractional word with a resolution of 13 bits plus a sign bit. Scale factor: 0.0122 ˚/s /bit To convert binary data: Angular Rate 0xEFBB Split each word into two bytes: Angular Rate 0xEF 0xBB Watson Industries, Inc. ARS-G152 Rev A 05/02/2019... - Page 19 For Angular Rate: Scale factor is: (400 ˚/s) / 32768 counts Angular Rate -100.24 ˚/s The nominal interface settings are: 9600 Baud 8 Bit Data 1 Start Bit 1 Stop Bit No Parity Watson Industries, Inc. ARS-G152 Rev A 05/02/2019...
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Page 20: Appendix C.2 Three Byte Binary Data Format
0x800000 = -400.000 ˚/s To convert binary data: Angular Rate Byte 1 Byte 2 Byte 3 0x90 0x84 0xDB Shift Byte 3 left once to remove the high bit (bit 7) of the low byte: Watson Industries, Inc. ARS-G152 Rev A 05/02/2019... - Page 21 For Angular Rate: Scale factor is: (400 ˚/s) / 8388608 counts Angular Rate 100.23 ˚/s The nominal interface settings are: 9600 Baud 8 Bit Data 1 Start Bit 1 Stop Bit No Parity Watson Industries, Inc. ARS-G152 Rev A 05/02/2019...
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