Campbell FW05 Manuel télécharger pdf (Page 60)

Appendix B. Serial Communications with the CSAT3

B-4

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

wind u

wind c diagnostic flags u

range u

range counter

B.3 Words 0 through 3

The u

, u

, and u

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

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

Wind from Word 0

Range Word 4 Range Code Conversion Output Resolution

b11 b10 (mm s

-1

)

0 1 1

wind (m s

-1

) = word 0 ∗ 0.001 ∗ 0.25

0.25

1 1 0

wind (m s

-1

) = word 0 ∗ 0.001 ∗ 0.50

0.50

2 0 1

wind (m s

-1

) = word 0 ∗ 0.001 ∗ 1.00

1.00

3 0 0

wind (m s

-1

) = word 0 ∗ 0.001 ∗ 2.00

2.00

TABLE B-4. Converting u

Wind from Word 1

Range Word 4 Range Code Conversion Output Resolution

b09 b08 (mm s

-1

)

0 1 1

wind (m s

-1

) = word 1 ∗ 0.001 ∗ 0.25

0.25

1 1 0

wind (m s

-1

) = word 1 ∗ 0.001 ∗ 0.50

0.50

2 0 1

wind (m s

-1

) = word 1 ∗ 0.001 ∗ 1.00

1.00

3 0 0

wind (m s

-1

) = word 1 ∗ 0.001 ∗ 2.00

2.00

TABLE B-5. Converting u

Wind from Word 2

Range Word 4 Range Code Conversion Output Resolution

b07 b06 (mm s

-1

)

0 1 1

wind (m s

-1

) = word 2 ∗ 0.001 ∗ 0.25

0.25

1 1 0

wind (m s

-1

) = word 2 ∗ 0.001 ∗ 0.50

0.50

2 0 1

wind (m s

-1

) = word 2 ∗ 0.001 ∗ 1.00

1.00

3 0 0

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

-6. Word 3 must be converted to a base 10 representation before applying the

equation.

1 2 ... 55 56 57 58 59 60 61 62 63 64 65 ... 71 72

Commentaires sur ces manuels

Pas de commentaire

Campbell FW05 Manuel Page 60

Commentaires sur ces manuels

Produits connexes et manuels pour Mesure, test et contrôle Campbell FW05