Guardian SA12020 User Manual

N8724V1 5/00

downloaded from: http://www.guardianalarms.net

PTDCM

(SA12020)

PassPoint Door Control Module

INSTALLATION INSTRUCTIONS

General Information

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.

Power Requirements

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.)

DCM Relay Outputs

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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If you choose to connect the supervision inputs, make sure that you enable the corresponding
relay’s voltage supervision.

DCM Trigger Outputs

The DCM provides two trigger outputs (15mA, 15VDC, open collector, sink to ground). Each
trigger contains a 680 ohm series resistor. A trigger is considered “ON” when its output
transistor is turned on, allowing current (up to 15mA) to flow into the trigger output pin from a
higher potential.

Normally, triggers are configured as part of an access point, as pre-alarm triggers. Pre-alarm
triggers can operate a sounder or LED to indicate to a user that a door is being held open too long
and, unless the door is closed, the access point will go into alarm. The pre-alarm trigger is also
turned on when an access point is in an alarm state. If it is desired that the trigger control a loud
sounder that requires more than 15 mA to operate, the trigger can be used to energize a separate
relay that in turn will control the sounder.

Triggers can be configured in three different ways:

•

Controlled - The system or a user can command the trigger on or off.

•

One-Shot - When commanded by the system or a user, the trigger turns on or off for a
specified number of seconds, then de-energizes.

•

Repeating - When commanded by the system or a user, the trigger turns on for a specified
number of seconds, then turns off for a specified number of seconds. This cycle is then
repeated, also for a specified period of time or repeated indefinitely until commanded to stop.

DCM Zone Inputs

The DCM provides four zone inputs. Each zone is capable of a supervised (3-state) or
unsupervised (2-state) configuration. Normally, zones are configured as part of an access point
to provide Door Status Monitoring or Request-To-Exit inputs.

DCM zone inputs can be configured in one of four ways:

•

Normally Open

•

Normally Closed

•

EOLR (End of Line Resistor) Normally Open

•

EOLR (End of Line Resistor) Normally Closed
(EOLR zones require Ademco’s standard 2K ohm end of line resistors)

The following table details the various configuration options for DCM zone inputs:

Zone States TWO STATE ZONE

Normal

Sensor State

0

(short)

R NA NA NORMAL NORMAL

2R NA NA NA NA
infinite
(open)

Sensor

Connections

(unsupervised)

Normally

Open (N.O.)

FAULT NORMAL FAULT TROUBLE

NORMAL FAULT TROUBLE FAULT

Normally

Closed (N.C.)

THREE STATE ZONE

(EOLR supervised)

Normally

Open (N.O.)

R

Normally

Closed (N.C.)

R

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