Campbell-scientific CSAT3 3-D Sonic Anemometer Manual de usuario Pagina 62
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Appendix B. Serial Communications with the CSAT3
TABLE B-2. RS-232 Output
Word 0
Word 1
Word 2
Word 3
Word 4
b15 - b0
b15 - b0
b15 - b0
b15 - b0
b15 b14 b13 b12
b11 b10
b09 b08
b07 b06
b05 - b00
u
x
wind
u
y
wind
u
z
wind
c
diagnostic flags
u
x
range
u
y
range
u
z
range
counter
B.3 Words 0 through 3
The u
x
, u
y
, and u
z
wind speeds are reported on one of four different ranges.
This range is given by bits b11 through b06 in word 4. In order to decode the
wind speed, first look at the wind speed range code, then decode the data with
the appropriate equations given in TABLE B-3 through TABLE B-6. The data
in words 0 through 3 must first be converted into a base 10 representation
before applying the equations in TABLE B-3 through TABLE B-6.
TABLE B-3. Converting u
x
Wind from Word 0
Range
Word 4 Range Code
Conversion
Output Resolution
b11
b10
(mm s
–1
)
0
1
1
u
x
wind (m s
–1
) = word 0 ∗ 0.001 ∗ 0.25
0.25
1
1
0
u
x
wind (m s
–1
) = word 0 ∗ 0.001 ∗ 0.50
0.50
2
0
1
u
x
wind (m s
–1
) = word 0 ∗ 0.001 ∗ 1.00
1.00
3
0
0
u
x
wind (m s
–1
) = word 0 ∗ 0.001 ∗ 2.00
2.00
TABLE B-4. Converting u
y
Wind from Word 1
Range
Word 4 Range Code
Conversion
Output Resolution
b09
b08
(mm s
–1
)
0
1
1
u
y
wind (m s
–1
) = word 1 ∗ 0.001 ∗ 0.25
0.25
1
1
0
u
y
wind (m s
–1
) = word 1 ∗ 0.001 ∗ 0.50
0.50
2
0
1
u
y
wind (m s
–1
) = word 1 ∗ 0.001 ∗ 1.00
1.00
3
0
0
u
y
wind (m s
–1
) = word 1 ∗ 0.001 ∗ 2.00
2.00
TABLE B-5. Converting u
z
Wind from Word 2
Range
Word 4 Range Code
Conversion
Output Resolution
b07
b06
(mm s
–1
)
0
1
1
u
z
wind (m s
–1
) = word 2 ∗ 0.001 ∗ 0.25
0.25
1
1
0
u
z
wind (m s
–1
) = word 2 ∗ 0.001 ∗ 0.50
0.50
2
0
1
u
z
wind (m s
–1
) = word 2 ∗ 0.001 ∗ 1.00
1.00
3
0
0
u
z
wind (m s
–1
) = word 2 ∗ 0.001 ∗ 2.00
2.00
The speed of sound reported by the CSAT3 is the average between the three
sonic paths. The relationship to find the speed of sound is given in TABLE
B-6. Word 3 must be converted to a base 10 representation before applying the
equation.
B-4
- INSTRUCTION MANUAL 1
- Limited Warranty 3
- Assistance 4
- Precautions 5
- Table of Contents 7
- Anemometer 11
- 2.2 Output Signals 12
- 2.3 Physical Description 13
- 3. Initial Setup 14
- 4. Installation 15
- 4.2 Mounting 16
- 5. Wiring 18
- 6. CSAT3 Outputs 21
- 6.1.1 CRBasic Dataloggers 22
- 6.1.2 EDLOG Dataloggers 22
- 6.1.3 CR9000 22
- 7. Operational Principles 23
- 7.2 Embedded Code Version 3 24
- 8. CSAT3 Trigger 26
- 8.1 Sampling Modes 27
- 9. Data Pipeline Delay 28
- 10.4 Diagnostic Word 32
- 11. Maintenance 47
- 11.1 Wicks 48
- 11.2 Calibration 49
- 11.2.2 Test for Wind Offset 50
- B.1 CSAT3 RS-232 Commands 59
- B.3 Words 0 through 3 62
- B.4 Word 4 63
- C.1 Theory of Operation 65
- Long Signal Cables 69
- D.2 CR3000 Example 70
- D.3 CR23X Example 70
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