Digital Watchdog D2365T Installationshandbuch PDF herunterladen (Seite 8)

Duet2 D2600 / Duet3 D2650 Installation Manual – EU-D2600-D2650-INST/A10/v1 - 8

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7. Operation

The basic operation of the Duet is to intercept communication activity from the alarm control panel or

other digital communication device (Digicom) to the PSTN and redirect it to 1 or more locations using 1

or more signalling paths. The signalling paths can be WIRED (PSTN, LAN) or RADIO (GSM, GPRS,

SMS).

The Duet performs the following functions:

1. Intercepts alarm communication from the alarm control panel; stores the data for later or

immediate transmission and acknowledgement, according to programming;

2. Monitors the wired and radio paths for integrity. Signals any change of status;

3. Sends regular test transmissions;

4. Sends regular polling transmissions;

5. Allows SMS or downloader control of the 4 outputs;

6. Monitors the PSTN for incoming ringing and switches the alarm control panel to the PSTN

for any downloader transmissions;

7. Monitors the GSM network for incoming calls, either to download to the Duet, or to receive

SMS controls;

8. Monitors the alarm control panel calls via PSTN, and intercepts if required;

9. Operates according to NVM programmable features and options (see NVM programmer).

7.1 Call Interception

The Duet works in 1 of 2 modes: Duet Priority or PSTN Priority.

7.1.1 Duet Priority

The PSTN relay is energised, so that the control panel is connected to the Duet. All calls are

intercepted by the Duet and re-transmitted via radio or LAN.

If the radio and LAN paths fail, or if a programmable number of call attempts fails, the PSTN relay is

de-energised and the alarm control panel is connected directly to the PSTN, so that its normal calling

function may proceed as if the Duet was not there.

In DUET PRIORITY MODE, the Duet intercepts alarm communication from the alarm control panel

and, depending on programming, will either:

- Acknowledge the message and store the data for later transmission, or

- Store the data and immediately attempt to forward the call without sending an ACK to the

control panel.

7.1.1.1

Store and Forward

In this case, the Duet accepts the call from the alarm control panel, stores it and sends and ACK

message back to the alarm control panel. The Duet then calls the ARC and passes the message on.

The Duet works in this way automatically for 5 minutes (or whatever the “Acknowledge Timer” is set to

in programming) after every successful call to the ARC.

Note: SIA format only works in this mode regardless of NVM programming.

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Digital Watchdog D2365T Installationshandbuch Seite 8