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Jewell Instruments DXA/DXI Quick Start Guide v. 7/2013

QUICK START GUIDE

MODEL DXA/DXI 100/200

DIGITAL ACCELEROMETER &

INCLINOMETER

JEWELL INSTRUMENTS, LLC

Via Paolo Uccello 4 - 20148 Milano

Tel +39 02 48 009 757 Fax +39 02 48 002 070

[email protected] www.dspmindustria.it

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Summary of Contents for DXA 100

Page 1: ...tart Guide v 7 2013 QUICK START GUIDE MODEL DXA DXI 100 200 DIGITAL ACCELEROMETER INCLINOMETER JEWELL INSTRUMENTS LLC Via Paolo Uccello 4 20148 Milano Tel 39 02 48 009 757 Fax 39 02 48 002 070 info dspmindustria it www dspmindustria it ...

Page 2: ...order and significance of these bytes is fixed and is explained the following 7 Byte Data Packet Prefix UAID D0 D1 D2 Aux Checksum Prefix The prefix byte will always start the beginning of any data packet The value of this prefix for all data packets will be 0xA6 UAID The UAID byte serves as both the identifier for which axis is transmitting on a particular unit and the address for incoming comman...

Page 3: ...ster value number of samples in an output average etc Checksum Checksum computation for packet transmission verification Decoding DXA Models Value is in fractional g s with 17 fraction bits These results in the MSB representing the largest fractional portions of the output value where bit 16 of 0 17 represent 0 5g Available integer sizes in C are generally 8 n bits If 16 bits are enough you can st...

Page 4: ...t left justified in the 32 bit integer and mask off the Flag bits scale will be Q31 Reading will peg at these values but the instrument is specified only over its calibrated range these end values may not even be reachable The calibrated Full Scale and inclination values for a unit with 60 degree full scale reading correspond to 60 deg In the Q31 scaled integer above with 18 actual data bits 60 de...

Page 5: ...ment isn t required is the poll command where a combination of the prefix and unit address satisfies the requirements for decoding For single action commands as in turning off RS 422 emulation off or turning on averaging one argument is used In the event a command is issued where the tuning of a specific parameter is required the argument consists of one static byte to identify the primary command...

Page 6: ...e Data Packets Poll X A9 71 E4 7 Byte Data Packet Poll Y A9 72 E3 7 Byte Data Packet Set Baud 19 2k X Y AC 73 B0 2F A3 71 B0 3A A3 72 B0 39 Set Baud 38 4k X Y AC 73 B1 2E A3 71 B1 39 A3 72 B1 38 Turn ON RS 422 Emulation X Y AC 73 C3 1C A3 71 C3 27 A3 72 C3 26 Turn OFF RS 422 Emulation X Y AC 73 C2 1D A3 71 C2 28 A3 72 C2 27 Allow Update X Y AC 73 01 DE A3 71 01 E9 A3 72 01 E8 Update Configuration ...

Page 7: ...S 422 sub mode of the DXA DXI Demo has the break command built in for easy transition to the temporary RS 485 unit state Pressing the break button near the bottom of the VI window will automate sending the Break command continuously with rubouts As the user you need to cycle power during this 5 second window After the time has elapsed the VI will default back into the RS 485 mode as the unit shoul...

Page 8: ...nder the same name allows for an unsigned integer value between 1 and 255 to be entered This entry is used in order to convert that number back into the unsigned hexadecimal equivalent At which point it is used as the second argument for the function and the checksum is calculated for the user For more information on the implementation and calculating the effective 1 pole filter target value see t...

Page 9: ...ging polarity operational mode effective filtering etc The third operational mode is a temporary RS 485 mode which behaves in the exact some fashion and the standard RS 485 mode with one exception While in the temporary RS 485 mode a power cycle or RESET command will cause the system to reboot At which point if enabled default back into RS 422 Emulation Namely the RS 485 mode if designed for 2 pri...

Page 10: ... have successfully placed the unit into temporary RS 485 mode You can confirm this by requesting a executing a poll command If untrue the unit will continue to send data constantly and the process in step one will need to be repeated Once in temporary RS 485 mode if the unit needs to be placed into a permanent RS 485 mode the Turn RS 422 Emulation OFF command must be executed If you are just modif...

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