16
RELAY 2
Off – Relay 2 is not on
Green (steady) – Relay 2 is on
RELAY 3
Off – Relay 3 is not on
Green (steady) – Relay 3 is on
The overall system status is visible at a distance via the status lights as described above. More detailed system information is
displayed on the LCD, which can show the status of each relay and sensor. A typical status display is shown in Figure 3-4.
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 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. 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.
Figure 3-3 Keypad layout
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.
