USER'S GUIDE ____________________________________________________________________
46 __________________________________________________________________ M210543EN-F
may, however, be conditions where other parameter values give better
results.
Table 11 below lists the commands for displaying and changing the
parameters.
Table 11 Display and Change Parameters Commands
Local practice may require changes, especially in the precipitation
intensity limits (moderate, heavy). See section WSET on page 61 for a
description of the WSET command.
The precipitation intensity and amount measurement is not calibrated at
the factory. Higher accuracy can be achieved by adjusting a scaling
factor (RAIN INTENSITY SCALE) with the WSET command. The new
scaling factor can be calculated by comparing PWD22/52 against a
reference rain gauge. See section WSET on page 61 for a description of
the WSET command, and for further instructions.
The low visibility alarm limits (3) are zero by default. That is, no alarms
are generated and no relays are activated.
Use the CONF command to set the alarm limits.
Verifying the Installation
Before connecting PWD22/52 to a weather station or other host verify
the basic installation:
1. Connect a terminal through RS-232 serial line to the sensor.
2. Set the terminal baud rate to 9600 bps and the data frame to contain
7 data bits, 1 stop bit, even parity.
3. Switch the power supply on.
4. After startup, the PWD22/52 output is the following:
VAISALA PWDxx V x.xx YYYY-MM-DD SN:XXXXXX
ID is also included, if configured. Example:
VAISALA PWDxx V x.xx YYYY-MM-DD SN:XXXXXX ID STRING: 1
If the output is not as in the above example, check the cabling and
baud rate of the service terminal (program). If wrong characters are
shown, try other baud rates, such as, 300, 1200, 2400, and 4800.
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