Campbell Scientific CD294 DataView Dual Line Data Display - Manual (Page 12)

DataView (CD294) Dual Line Data Display
Operating temperature range:
0 o C to +55 o C
Low power mode temperature range:
-20
o C to +55 o C
Environmental
IP65 when using supplied sealant.
Operation
Once the DataView has been programmed to display the desired location, it
can be connected directly to the datalogger via the flying lead and DB9
connector. If the datalogger has power, then the DataView will attempt to
collect the desired locations from the logger. If successful, the display will
contain the first description, with the first selected input location value and the
first units description. For example, assume that the LCD file described in the
Programming section was created and sent to the DataView then the first
screen displayed will be:
Air Temperature
24.591 deg C
Pressing the down button will make the program advance to the second screen
that is
Wind Speed
1.2315 knots
Another press of the down button will display the third screen
Wind Direction
95.343 deg
Pressing the down button again will wrap around to the first screen again. The
up button will go in the reverse direction.
The operation of the DataView once programmed is designed to be as simple
as possible and so operation at this stage consists of pressing either up and
down to move through the screens.
If no button has been pressed for the previous two minutes, the DataView will
go into low power mode and the display will be turned off. To re-activate the
unit simply press either button. The display will begin at screen 1 again.
Using in conjunction with SDS511
Often, the DataView is used in conjunction with the SDS511 dual port adaptor.
This allows the display to be permanently plugged into the datalogger while
still allowing the user to plug in their computer or a modem (for example) into
the datalogger as well.
Data transfer between the datalogger and the DataView
PC294W sends the execution interval of the program to the DataView when it
sends the locations to display. The DataView uses this information to decide
when to collect the data. Once the data has initially been collected from the
datalogger, the DataView then waits another full execution interval before re-
reading the input location values. This allows the communications port to be
used for other purposes in the meantime. If the communications port is busy
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