5
Screen
All information necessary to operate the SENTRY
®
200 is displayed on its Liquid Crystal Display screen. The
contrast between the screen and displayed information may be adjusted by accessing the SETUP menu, explained
later in this Manual.
Keyboard
The keyboard consists of seventeen (17) keys displayed on the top
surface of the instrument. All information necessary to perform
tests can be entered using the instrument’s alpha-numeric
keyboard (Figure 1).
On/Off Key:
When plugged into an appropriate power source the
SENTRY
®
200 may be turned on or off by depressing the power key
on the keyboard. The power key is identified by the international
symbol for power. *Always depress the power key to turn off the
SENTRY
®
200. Disconnecting or switching off the power source
before turning off the instrument can result in the loss of the
current test result from the memory.
Arrow Keys:
The arrow keys allow you to scroll up and down,
as well as left and right within the onscreen menus of the
SENTRY
®
200.
Alpha-Numerical Keys:
Numbers can be entered by pressing the appropriate numeric key (1 for 1, 2 for 2, 3 for 3,
etc.). Alphabetical characters can be entered by depressing the corresponding key repeatedly to cycle through the
associated numbers and letters. For example, the screen will display the lower case letter ‘n’ by depressing the 6
key three times, cycling through the following entries: 6, m, n, o, M, N, O. Press the right or left arrow keys to move
to the adjacent space to enter the next letter or correct an adjacent letter.
Variable Option Selection Keys:
The two buttons directly beneath the LCD screen allow you to select variable
options that will appear within the menus of your SENTRY
®
200 reader. For example, in the Main screen (Figure 2)
the variable option selection key on the right is underneath the “Select” command. In this case, when pressed, the
variable selection key on the right will ‘Select’ the menu item that is highlighted. The variable options of the keys
include several commands: “Select’, ‘Back’, ‘Edit’, ‘Read’, etc, depending on the menu that is currently displayed on
the LCD screen. For simplicity, henceforth this manual shall refer to the command that the variable keys are associ-
ated with, rather than the keys themselves. For example, “Press the ‘Back’ key” will mean press the variable option
selection key that is underneath the ‘Back’ command.
Figure 1. Alpha-numeric keyboard.