DART Controls DP4 Control Series Instruction Manual page 18

Mode 3: Pulse & Auto Reset
In this mode, the alarm output will pulse on and off until the alarm condition ceases to
exist. The pulsed modes are commonly used for audible alarms where a constant output
would be considered distracting or awkward. The alarm will automatically reset when the
conditions return to normal.
Mode 4: Pulse & Manual Reset
In this mode, the alarm output will pulse on and off until the alarm is reset manually. See
parameter 42 for reset details. The pulsed modes are commonly used for audible alarms
where a constant output would be considered distracting or awkward.
Parameter 42 – Alarm 1 Reset Configuration
This setting determines which actions will cause an active alarm to be silenced or reset.
Mode 1: No Silencing, Reset On Any Button Press
In this mode, an active alarm cannot be silenced. Once the alarm condition ceases to
exist, however, any user-interface button may be pressed to cause a manual reset.
Mode 2: No Silencing, Reset On S2 Input High (Not Wired To Common)
Similar to Mode 1. Once the alarm condition ceases to exist, setting the S2 input to a
high (+5V) state or allowing it to float disconnected will cause a manual reset.
Mode 3: No Silencing, Reset On S2 Input Low (Wired To Common)
Similar to Mode 1. Once the alarm condition ceases to exist, setting the S2 input to a low
(COM) state or wiring it to common will cause a manual reset.
Mode 4: Silencing Enabled, Reset On Any Button Press
When the conditions for an active alarm persist, pressing any user-interface button will
result in the alarm being silenced or deactivated, but not reset. A second attempt to reset
the alarm must be made after the condition cease to exist to clear the alarm.
Mode 5: Silencing Enabled, Reset On S2 Input High (Not Wired To Common)
Similar to Mode 4. Setting the S2 input to a high (+5V) state or allowing it to float
disconnected will cause the alarm to be silenced or reset depending on the current state
of the alarm conditions.
Mode 6: Silencing Enabled, Reset On S2 Input Low (Wired To Common)
Similar to Mode 4. Setting the S2 input to a low (COM) state or wiring it to common
will cause the alarm to be silenced or reset depending on the current state of the alarm
conditions.
Parameter 43 – Alarm 1 Display Flash On Alarm
This will cause the display to flash when an alarm condition is active.
Parameter 44 – Alarm 1 Pulse on Time
This parameter defines the number of seconds the output should be enabled during the 'on'
phase of an active pulsing alarm's output.
Parameter 45 – Alarm 1 Pulse off Time
This parameter defines the number of seconds the output should be disabled during the 'off'
phase of an active pulsing alarm's output.
Parameter 46 – Alarm 1 Pulse Count
This setting determines how many pulses are output when the alarm is activated and is
configured in pulse output style. When 0 is entered, the unit will be set for continuous pulses
while the alarm is active.
Parameter 47 – Alarm 1 Lower Limit
This setting defines either the lower limit or lower end of a range for the alarm region. Alarm
limits are set in display units without regard to decimal point or colon position. In Rate Modes,
a limit of 123 could represent a display value of 123, 12.3, 1.23, or 0.123. When in Time Mode,
a limit of 123 would represent 1:23 on the display.
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