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Chapter 4. Basic Programming
22 TMO2D User’s Manual
4.2.1 Key Functions
The [YES] key enables you to confirm numeric entries or to select a displayed menu option.
The [NO] key enables you to clear a numeric entry or to scroll forward through the menu options.
The [

] key has two functions:
• It serves as a backspace key during numeric entry. At each press of [

], the display erases the last digit on the
right of the entry.
• It also enables you to step backward through a list of menu options.
The [

] key enables you to scroll forward through the menu options; it is equivalent to pressing the [NO] key in the
Menu Mode.
4.3 Programming the TMO2D Using the Display
This section briefly explains display and menu navigation, and then takes you step-by-step through the
programming procedure.
4.3.1 Display Navigation
On power-up, the first line of the LCD screen contains the current measurement parameter and a real-time clock.
The second line of the LCD contains the measured data on the left and the current alarm condition on the right (see
Figure 13 below).
Figure 13: TMO2D Display
While displaying the gas concentration, the display will ignore all keys except the [NO] key. If you press [NO], the LCD
will begin displaying Enter Code: and you must enter the program entry code ([1] [2] [3]). During code entry, the
display continues to update the data display, alarm status, and recorder output.