D4220 Installation Manual - D4220-INST/09F/v2
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2.4 Mounting
When the board is removed, use at least two of the screw slots in the back of the case to fix the case
to the mounting surface. Remove the knocknout chosen to make the cable entry; there are a total of
14 knockout slots situated in the 4 case corners.
The antenna should be fitted to the antenna socket before the board is clipped in. When fitting the
aerial, do not hold the aerial shaft, but use the brass fitting at the base of the aerial.
If an optional antenna with cable is fitted, the SMA plug should be fed through the antenna aperture
first and screwed into the board SMA connector.
When the board is fitted, adjust the back tamper screw by turning it clockwise until a click is heard,
signifying that the back tamper switch has closed.
2.5 Connections
RST
Reset input, used to reset the unit from a remote output active high, compatible with 5V and 12V
logic voltage signals. When activated, this input can reset the relay outputs the same as the front
panel reset button, but cannot clear the reset pending LED display or fault displays. It can clear
alarm displays.
12V
Nominal 12V, 10.5V to 15V, normal quiescent current 40mA, 220mA maximum, low voltage
detection between 10 to 10.5V.
A/T
Pair of clean contacts that open when:
1. Lid
is
removed
2. Unit is removed from mounting surface
3. When the expander lid or back tamper is violated (if fitted)
The contacts are closed when all the inputs are in a normal condition (no reset required).
CH1
Changeover relay clean contacts energised when the channel 1 activations are received. The
connections are common, normally open and normally closed. The contacts are rated at 24V 2A
maximum.
CH2
Changeover relay clean contacts energised when the channel 2 activations are received. The
connections are common, normally open and normally closed. The contacts are rated at 24V 2A
maximum.
TAMP
Changeover relay clean contacts energised when any radio transmitter tamper condition is sensed.
The tamper relay is de-energised either with a reset or when all the radio tampers are restored. A
supervision fault (detector periodic supervision report missing) for more than 4 hours will be
registered as a tamper. The connections are common, normally open and normally closed. The
contacts are rated at 24V 2A maximum.
