Operating manual: PHOTOMETER FM-4 9
3. 1. Writing Data to the Photometer
Select working parameters, switching combinations, working modes, etc. By clicking
Write button the data are downloaded to the photometer. Data is only applied to device
with accurate ID number (see System Settings tab). When download is done
successfully, read data is refreshed in all fields. In case of error at the procedure, “Error!”
message appears. In this case check the ID number and try downloading again.
Contactor Outputs
When Manual Manipulation option is selected user can manipulate contactor outputs by
clicking Level.., Event.. or contactor A..F on/off buttons. Currently switched contactors
will be marked red after first read/write operation. No “Read” / “Write” clicking required.
When Light Level option is selected the photometer responds to user defined contactor-
output combinations. Fields “Level 1..16” represents the upper limit for each switching
combination. They can be set for each level independently in cd/m
2
. Only numerical data
entry is excepted. When using less than 16 light level combinations, fill the rest of Light
Level fields with zeros, and first zero-level-field with the combination used when the
highest level specified is exceeded. (see: Picture 3 ; Table 2)
Averaging interval is the moving-average of light-level calculating time in minutes before
contactor outputs are switched. This eliminates switching due to short-time light changes
(approaching car, etc.) and provides hysteresis between the light levels. Numerical data
within 1.. 24 minutes can be selected.
There are two more combination fields “Event 1,2”. Fill those with combinations used at
special events (e.g. accident or fire). The combination is engaged when photometer
receives event status information via communication or frequency port (when configured
as Event input).
Wiper/Washer function is used with optional unit. When set, E and F contactor outputs
are dedicated to the wiper motor and the washer pump. Select the washing interval in
days for photometer’s front screen cleaning or apply immediate action by clicking Clean
Now button.
Range
Use Range setting to define measuring sub-range of the photometer. Always use the
lowest range possible, taking care that light level never exceeds it. In Auto Range mode
photometer switches ranges according to light conditions and offers best accuracy. Use
this option when light level data acquisition is done from serial communication, frequency
port or contactor outputs.
Click Write button to apply any chances.
Summary of Contents for Photometer FM-4
Page 2: ......
Page 23: ...V 1 2 rev 12 2012...