Chapter 3 ________________________________________________________________ Installation
VAISALA ________________________________________________________________________ 57
message type. The sensor can also be used in a polled mode, that is, a
data message is only sent when the host computer requests one with a
special command. In addition, the baud rate of the serial line can be
changed to a higher value. The default communications settings are
listed in Table 10 below.
Table 10 Default Communication Settings
Setting Default
Baud rate 300 baud (7E1)
Polled or automatic mode,
message type
Automatic mode, message 2
interval 15
Sensor ID No ID set
In multipoint communication where several sensors share the same
communication line, the FD12P should be used in the polled mode
and individual sensors must have distinct identifiers (ID).
The baud rate should not be changed if the optional 300-baud modem
is used.
The commands for changing the default settings are listed in Table 11
below. Detailed descriptions of the commands can be found in
Chapter 4 on page 59.
Table 11 Commands for Changing the Default Settings
Operation Command
Baud rate selection BAUD
Polled or automatic mode, message type setting AMES
Sensor ID configuration CONF
The FD12P has also several changeable parameters, which control the
operation of the present weather algorithm and precipitation
measurement. The factory set parameter values have been found
appropriate in tests and usually do not need to be changed. However,
there may be conditions where other parameter values give better
results.
The commands for displaying and changing the parameters are listed
in Table 12 below.
Table 12 Commands for Displaying and Changing the
Parameters
Operation Command
Parameter listing WPAR
Parameter change WSET
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