Vaisala PTB220 - Manual (Page 58)

U SER ' S G UIDE _______________________________________________________________________
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5. Use ENT key to acknowledge a selection. The selected
characters then move one step to the left and the next character
can be selected. Entering characters is ended by selecting a
space ' ' and then by pressing ENT key.
Note that modifications made using the keyboard will affect the serial
interface settings, too. Only the tracking function is separate for the
serial interface and for the display (see Chapter RUN and STOP
modes, TRACK command).
Only the display contrast can be adjusted if the KEYLOCK is ON. No
other modifications are allowed. It is possible to inspect the settings of
the barometer using the keyboard although the KEYLOCK has been
turned ON. However, the settings cannot be changed and the
barometer displays NO MODIFICATIONS ALLOWED message for
a few seconds before reverting to the original display. The barometer
will automatically return to the original display after a time-out limit
of approximately two minutes in case the inspecting is stopped in an
uncontrolled way.
The MENU mode is entered with the ENT key. Two windows are
then available for further selections:
Use the arrow keys ↑ and ↓ to scroll the alternatives and the ENT key
to acknowledge a selection. Use CL key to revert to the original
display.
The F IGURE 6-1 shows all the available functions and selections of the
local display of PTB220 series barometers.