Vaisala WXT520 Manuel d'utilisateur télécharger pdf (Page 8)

And switch the station off for 30 s. Change

the HyperTerminal to the new baud rate

(Call/Disconnect,

File/Properties/Configure and Call/Call

again).

Configuring the composite message

The composite message is configured to

contain the desired fields only.

Which wind fields are included in the

composite message, are configured with

command like:

0WU,R=&01001100,U=M

The 0's and 1's disable and enable fields.

The first 0 or 1 defines if Dn (Wind

direction minimum) is to be sent, the next

defines Dm (Wind direction average) etc.

0=not included and 1=included.

The "bits" have the meanings:

Bit Field

1 Dn Wind direction minimum

2 Dm Wind direction average

3 Dx Wind direction maximum

4 Sn Speed minimum

5 Sm Speed average

6 Sx Speed maximum

7 spare

8 spare

U=M defines that metric units are used

(m/s). This application note will not repeat

every detail about these settings – refer to

the Vaisala manual.

The pressure, temperature and humidity

fields are configured with similarly:

0TU,R=&11010000,P=H,T=C

Bit Field

1 Pa Air pressure

2 Ta Air temperature

3 Tp Internal temperature

4 Ua Air humidity

5 spare

6 spare

7 spare

Bit Field

8 spare

P=H selects pressure in Hectopascals.

T=C selects temperature in Celsius.

The rain fields are configured this way:

0RU,R=&00100100,U=M,S=M

Bit Field

1 Rc Rain amount

2 Rd Rain duration

3 Ri Rain intensity

4 Hc Hail amount

5 Hd Hail duration

6 Hi Hail intensity

7 spare

8 spare

Finally any supervisor fields are switched

off:

0SU,R=&00000000

Now, test that the composite message

contains the correct fields: Send

command

0R0

Vaisala should respond something like

this:

0R0,Dm=091D,Sm=0.1M,Ta=21.6C,Ua=9.9P,Pa=1025…

Numbering the parameters

Number the order of the parameters:

0R0,Dm=091D,Sm=0.1M,Ta=21.6C,Ua=9.9P,Pa=1025…

1...2.......3.......4........5.......6.....

This is necessary later when configuring

the 7470.

Finally enable the automatic

transmission

Send command

0XU,I=1

Now the weather station should send only

one type of message beginning with 0R0.

Vaisala is done. Close or disconnect the

HyperTerminal.

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