Chapter 5 ________________________________________________________________ Operation
VAISALA _______________________________________________________________________ 67
The meaning of the questions asked by the system is described below.
Bold text indicates user actions. The old settings do not change if the
user only presses ENTER as the answer.
1. If there is no valid password, the system requests a new password:
CONF. PASSWORD (4 CHARACTERS MAX)
If a password update is requested by the N parameter and
an empty line is given as an answer, the password is
removed. Otherwise, the user enters a new password.
2. The system asks the following:
UPDATE CONFIGURATION PARAMETERS
UNIT ID (2 CHAR) ( 1)
If the PWD22/52 unit is named by one or two character ID
codes, the OPEN and polling commands use it as a
parameter.
The ID code is also included in the data message heading.
If no other ID is given, the default value is ID 1 in the
message heading.
The user can remove the current ID by pressing the
hyphen ( - ) as an answer to the question.
In multidrop configuration, where several sensors are on
the same communication line, the units are differentiated
by the ID.
3. The next CONF parameters are hardware or system dependent.
They can be changed from the factory set values to improve
performance or for maintenance purposes.
In the example configuration session:
The currently measured offset value (not a parameter) is
shown in the brackets:
OFFSET ( 136.86) Y
OFFSET REFERENCE UPDATED
4. After receiving the Y answer, the system accepts the offset
frequency as the reference parameter for hardware monitoring. The
parameter value is further compared with the current value to detect
drift or other failure in the optical signal measurement electronics.
5. Visibility alarm limits are checked to ensure that Limit 1 is higher
than Limit 2, and Limit 2 higher than Limit 3. Limit values are
expressed in meters.
ALARM LIMIT 1 ( 1000)
ALARM LIMIT 2 ( 200) 300
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