Campbell 21X Manuel de l'opérateur télécharger pdf (Page 83)

SECTION

8. PROCESSING

AND

PROGRAM

CONTROL

EXAMPLES

02:

03:

11:

01:

02:

03:

o4:.

05:

60

10

minute

interval

Set

high Flag 0

(output)

Wind

Vector

Rep

Samples

per

sub-interual

US,

DV, SD

(Polar

Sensor)

Wind Speed/East

Loc WS

Wind Direction/North

Loc

0-360

wD

Average

Reps

Loc Ta

3:Ta

4:SR

S:WS output

6:0-540

out

7:Ta

output

8:SR

output

10:0-540 WD

*3

01:

01:

02:

01:

02:

03:

o4:

03:

01:

04:

05:

01:

06:

O7:

P31

01: 2

Q2:

10

08: P89

01:

10

Q2:

4

03:

180

04: 30

10: P34

01:

10

02:

360

03:

10

11: P31

01:

10

Q2:

6

Table

3 Subroutines

Beginning of Subroutine

Subroutine Number

lf X<=>F

X Loc 0-540

WD

>=

F

Then Do

Do

Set high Flag

1

Else

Do

Set low Flag

1

End

Z=X

X Loc 0-360

WD

Z Loc

[:0-540

WD]

lf X<=>F

X Loc 0-540

WD

F

Then

Do

ll Flag

1 is

set

Then Do

Z=X+F

X

Loc 0-540

WD

F

Z

Loc

[:0-540

WD]

Z=X

X Loc 0-540

WD

Z

Loc

[:0-540

out]

95 End

95 End

P69

1

180

00

1

12:

P71

01:

2

02:

3

P85

1

P89

10

3

270

30

P86

11

P94

P86

21

P95

13:

P End

Table

1

8.6

CONVEHTING

0.360

WIND

DIRECTION OUTPUT

TO 0.540

FOR

STRIP

CHART

lf 0-360

degl'ee

wind direction

is output

to a

strip

chart,

the

digcontinuity at

0/360

will cause the

pen

to

jump

back

and

forth

full scale

when the

winds are

v{rying from the

north.

In the days of

strip

charts

{nis

was solved

with a 0-540 degree

pot

on

the

vriind

vane

(direction

changes

from

540 to

180

dnd

from

0

to 360

so the

pen

only

jumps

once

iivhen

the

wind

is out of

the north or

south).

When

with

the

necessity

of strip chart

output

(see

example),

the

following

algorithm

be used to

change

a 0-360 degree

.

(lf you

have a

0-540

pot,

it can

input to

be

used

the 21X

since the

Wind

Vector

Instruction,

,

willwork

with this

output.)

To change

Q-360

degrees

to the

0-540 degrees,

360

degree$

must

sometimes

be added to

the

reading

wh(n

it

is

in

the

range

of 0

to

180.

The

following

al$orithm

does this

by

assuming that

if

the

previou$

reading

was less than

270, the

vane has

shifted through

180 degrees and

does

not need

to

be

altered.

lf the

previous

0-540

reading

waq

greater

lhan27O,360

degrees

is

added.

This example

is

written

as a

subroutine

which is

used

by

the

previous

example

to

output an

analog

volt4ge

to

a strip

chart.

Input

Locatipn Labels:

1:WS

09:

P91

01:

11

02:

30

12:

P

13: P

1

8-7

2:0-360

W

1 2 ... 78 79 80 81 82 83 84 85 86 87 88 ... 190 191

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