Chapter 5 ________________________________________________________________ Operation
VAISALA _______________________________________________________________________ 65
First the system asks for a new password:
CONF. PASSWORD (4 CHARACTERS MAX)
This question is asked, when there is no valid password. If updating is
requested by the N parameter and an empty line is given as an answer,
the password is removed. Otherwise, the user gives a new password to
the system.
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. ID 1 is used as a default in the
message heading, if no other ID is given. The current ID can be removed
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.
The next CONF parameters are hardware or system dependent. They can
be changed from the factory set values for better performance or
maintenance purposes. The example configuration session is explained in
the following.
The currently measured offset value (not a parameter) is shown in the
brackets.
OFFSET ( 136.86) Y
OFFSET REFERENCE UPDATED
After receiving the Y answer, the system accepts the offset frequency to
be 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.
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
ALARM LIMIT 2 UPDATED
ALARM LIMIT 3 ( 100)
In the example above, alarm Limit 2 gets a new value 300 m. When the
visibility now weakens below Limit 2, then the data message (0 ... 2) data
status is set to 2. The visibility alarm is not shown in the STAtus message
To Next Page
Loading...