Vaisala HMT330 - Manual (Page 75)

Chapter 4 _________________________________________________________________ Operation
VAISALA ________________________________________________________________________ 73
Keypad Lock (Keyguard)
This function locks the keypad and prevents unintentional key presses.
1. Keep pressing the left-hand function button for 4 seconds to lock
the keypad (at any display).
2. To unlock the keypad, press the OPEN button 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 ►arrow button.
3. Select Menu PIN, press the ON button.
4.
Enter a PIN code by using the ▼▲arrow buttons. Press OK to
confirm the setting. Now the PIN lock is on and a key symbol is
shown in a display.
5. Press EXIT to return to the basic display. Returning to the menu is
possible only by entering the correct PIN code.
When you want to turn off the PIN lock, go to the menu by giving the
PIN code and select System, Menu PIN, press OFF button.
In case you have forgotten the PIN code, open the transmitter cover and
press the ADJ button once. Wait for a few seconds and the adjustment
menu opens. Select Clear menu PIN, press
CLEAR.
NOTE You can also disable the keypad completely with serial command
LOCK. See section Locking Menu/Keypad Using Serial Line on page
111.