Specifications

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3.1.2 User Interface
The LCD display is used to show detailed information about the status of the control system and the configuration parameters to the user. The keypad (Figure 3-3) is used to select the
information displayed and to enter the configuration parameters, which are stored in the DVP-120 memory. The keypad consists of the usual ten digit keys, four direction keys, plus a
MENU key that is used to access the configuration menu and a HUSH key that will silence the audible alarm indicators.
Figure 3-3 Keypad Layout
In normal mode, holding the zero key for three (3) seconds can be used to lock the keypad against accidental (or unauthorized) use. See Section 4.5 for details.
Cursor Keys
In normal mode, (no warnings or alarms indicated), the up and down cursor keys will scroll the display to any configured sensors’ status. In normal mode, the left and right cursor keys will
scroll through the status of each of the relays. When the left (or right) key is used to scroll to another relay, the display will remove the underlining under the sensor number and underline
the relay number; this indicates that the digit keys can be used to jump directly to a particular relay’s status. When the up or down key is again used the display will switch back to the digit
keys jumping to a particular sensor.
MENU Key
The MENU key has three functions. First, when the system is presenting the normal display, pressing the MENU key will cause the system to shift to the Configuration Menu. The second
function of the MENU key is to return to the next-higher menu level, e.g. from the sensor configuration menu to the system menu, or from the system menu out to normal mode. If in the
middle of entering a multi-digit parameter, the MENU key also cancels any changes to the parameter. When the MENU key is used to return to normal mode, any changed configuration
parameters are saved in the DVP-120’s memory. The third function of the MENU key is to change the LCD contrast by holding the MENU key for five (5) seconds, at which point the LCD will
prompt for further activities, see sections 4.4 for more detail.
HUSH Key
The HUSH key is only used to silence the audible indicators (internal buzzer and possible external Horn and Strobe devices). Pressing and releasing the button will silence the internal
buzzer. The HUSH button must be held for 3 seconds to silence the Horn and Strobe devices.
3.1.3 Normal Status Display
Figure 3-4 Normal System Display
The display shows the day of the week and the time of day, in 24-hour format. It also shows the status of one of the relays, R1 in this example, and the type and indicated gas
concentration of one of the configured sensors, S01 is a CO sensor indicating 5ppm in this example.
Notice in Figure 3-4 that the digits 0 1 are underlined; this indicates that the digit keys can be used to jump directly to another sensor’s status. When the first digit is pressed, the display
will prompt for the second digit of the target sensor.
Figure 3-5 Sensor Prompt
In this example, the first digit entered was 1. Since the DVP-120 can handle 12 sensors, the first digit for a sensor number is either 0 or 1. The leading zero must be entered when selecting
a sensor less than ten. When the second digit is entered, the normal display will be restored; showing the type and value for the selected sensor.
As mentioned above, the left and right scroll keys will display the next or previous relay’s status. The display will also change the underline to indicate that the digit keys (zero, one and two)
can be used to jump directly to a particular relay. Since only one digit is needed to select a relay, the system does it immediately rather than prompting to show the relay.
If the sensor is indicating a gas level that is greater than the alarm or warning levels, the gas reading will alternate with the words ALARM or WARNING as appropriate. If a sensor fails,
a connection is lost or the panel itself detects a failure of its own, the panel will enter TROUBLE mode and the gas reading will be replaced by the word TROUBLE (the TROUBLE status
condition is discussed in Section 3.1.6).
3.1.4 ALARM Status Display
When any sensor indicates a gas level that is at or above the configured alarm level for the sensor, the panel will enter ALARM mode, during which the internal buzzer will sound, the alarm
lamp will be red and the LCD will show the sensor type and channel number.
Figure 3-6 Alarm Display
The display will cycle through all sensors that are signaling alarm levels, at five seconds per display. Pressing any key (except HUSH) will advance the display to the next sensor that is
signaling an alarm level.
W WARNING
Do not cover or obstruct audible alarm opening or visual alarm LED. Doing so may adversely affect product performance and result in sickness or death.