Campbell Scientific CSAT3 CSAT3 3-D Sonic Anemometer - Page 61
Word 4, CSAT3 RS-232 Status Format
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Appendix B. Serial Communications with the CSAT3 TABLE B-6. Converting Speed of Sound from Word 3 Conversion speed of sound (m s-1) = word 3 ∗ 0.001 + 340.0 Output Resolution (mm s-1) (°C @ 25°C) 1 0.0017 B.4 Word 4 Word 4 contains diagnostic information and the reporting range of ux, uy, and uz wind speed. The diagnostic flags, bits b15 through b12, describe the status of the anemometer (TABLE B-7). A flag is on if the bit is set high. All the flags are on while the anemometer is acquiring signals or is in a lost trigger state (TABLE B-8). TABLE B-7. Decoding the Diagnostic Flags from Word 4 Bit Set High b15 b14 Description Difference in the speed of sound between the three non orthogonal axes is greater than 2.360 m s-1 (~ 4°C @ 25°C) Poor signal lock b13 Sonic signal amplitude too high b12 Sonic signal amplitude too low Comment The anemometer path length may have been altered or the anemometer head is broken. There may be an obstruction in the anemometer path or on the transducer face. An obstruction, in the anemometer path or on the transducer face, was removed. There may be an obstruction in the anemometer path or on the transducer face. Bits b11 through b06 are used in determining the range of the wind speed reported in words 0 through 2. Bits b05 through b00 are a diagnostic counter. This counter increments once per measurement. The minimum value is 0 and the maximum is 63. The counter wraps from 63 to 0 when the maximum value is incremented by one. TABLE B-8. Special Case - Not a Number Not a Number Conditions Not Available Lost Trigger Word 0 hex base 10 8000 -32768 8000 -32768 Word 1 hex base 10 8000 -32768 8000 -32768 Word 2 hex base 10 8000 -32768 8000 -32768 Word 3 hex base 10 8000 -32768 8000 -32768 Word 4 hex base 10 F03F 61503 F000 61440 B.5 CSAT3 RS-232 Status Format The CSAT3 returns a 10 ASCII byte status in response to a "S" or "P" command. This status provides information on the CSAT3's Trigger Source and the Execution Parameter. It also indicates if the analog outputs are on/off, if the CSAT3 is reporting good data, and serial number of the CSAT3. This software serial number matches those on the anemometer head and electronics box. B-5