Vaisala PTU300 - Manual (Page 77)

Chapter 4 _________________________________________________________________ Operation
VAISALA ________________________________________________________________________ 75
Using Serial Line
Use the serial line command CON to view or set the display contrast.
CON [xxx]
where
xxx
= Contrast value for display. Recommended range -9 ... 9,
default 0. Negative values make screen lighter, positive
values make it darker.
Example (view current contrast setting):
>con
Contrast : 0
>
Example (set contrast to 5):
>con 5
Contrast : 5
>
Keypad Lock (Keyguard)
This function locks the keypad and prevents unintentional key presses.
1. Press and hold down the left function button for 4 seconds to lock
the keypad (at any display).
2. To unlock the keypad, press and hold down the same key for 4
seconds.
Menu PIN Lock
You can prevent unauthorized changes of the device settings by
activating the menu PIN lock. When this function is activated, the basic
display, graphical view, and device information displays are available,
but access to the menus is locked. The key symbol
indicates the
activation of this feature.
1. Open the Main Menu by pressing any of the arrow buttons.
2. Select System, press the right arrow button.
3. Select Menu PIN, press the ON key.
4. Enter a PIN code by using the up/down arrow buttons. Move to the
next digit by pressing the left/right arrow buttons. Press the OK
key to confirm the setting. Now the PIN lock is on and a key
symbol is shown in a display.
5. Press the EXIT key to return to the basic display. Returning to the
menu is possible only by entering the correct PIN code.