Guardian Technologies PTDCM (SA12020) Manuale Utente

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The Door Control Module (DCM) is used to control access points, or doors.  When connected
between door hardware and the Main Logic Board, the DCM accepts data from card readers
and/or keypads, and operates the electromagnetic devices used to lock and unlock the door.  The
DCM mounts in a standard cabinet and communicates with the system’s MLB via a twisted pair
network connection.

Each DCM provides all the inputs and outputs necessary to manage two single-reader access
points or one two-reader access point.

When mounted in a cabinet with a dedicated power supply, the DCM obtains its power from the
LOCAL (J1) power output connection of its associated power supply.  When added to a cabinet
along with an MLB or other module, the DCM obtains power from the power supply’s
REMOTE (J5) power output.

The DCM board requires 10.5-14VDC @ 170mA, but its actual current requirement will be
determined by the addition of the current requirements of two card readers (or keypads), which
are typically 90mA each.  The DCM also provides two power supply monitoring inputs: Low
Battery and AC Loss.  These two inputs are compatible with the corresponding monitoring
outputs of the PassPoint PTDPSU power supply only.  (Do not enable AC or Low Battery
monitoring without first wiring the power supply.)

In addition to card reader inputs, each DCM has two Form C, voltage-supervised output relays.
These relays are used to operate electromagnetic door locks or doorjamb mounted lock strikes.
Use appropriate transient suppression for the installed locking devices.

All DCM relays may be used as committed resources to control access points.  For instance, one
of the operating parameters that can be configured for DCM relays is the length of time that the
relay output is energized when allowing entry or exit through an access point.  DCM relays
cannot be commanded ON or OFF when used as a committed resource.  Instead, the access point
these relays are assigned to must be bypassed or locked.

The relay output circuitry provides for a supervision input (30VRMS or 30VDC max.) which,
when connected to the common contact of the relay, indicates that a voltage of more than
approximately 4VDC or 4VAC is present at the relay contacts.  The supervision input is rectified
and filtered before going to the comparator, therefore DC & AC voltages can be supervised.  The
module's firmware doesn't know or care if the voltage is DC or AC.  This supervision can be
useful to determine if the power supply that is used to power a connected load is fully
operational.  Each relay can be programmed to monitor the relay contact voltage or to ignore it.

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