Installation manual

Duet2 D2600 / Duet3 D2650 Installation Manual – EU-D2600-D2650-INST/A10/v1 - 10

7.3 Line Monitoring
The Duet will constantly monitor the programmed paths for integrity. Should the PSTN path fail, for
example, the Duet will construct a 'PSTN Line Fail' message, using programmable details, and pass
this data message into the NVM for processing. Similarly if any other path should fail a suitable
message will be constructed and passed to the NVM.
Please refer to the Test Call and Line Monitoring NVM strings in 7.4.3 below.
Should both radio and wired paths fail, the Duet will operate the 'Fault' relay output and switch the
PSTN relay over to the alarm control panel.
If only one calling path has been programmed, and it fails, the relay output will also operate. This
output will remain active until a programmed path becomes available, or the Duet is reset.
7.4 Duet-Generated Calls
7.4.1 Test Calls
Test data messages may be set to occur at regular intervals. A single timer exists for this. If
programmed to 0, no test calls will occur. The period may be programmed from 0 to 99. The units
may be selected from Seconds, Minutes, Hours or Days.
Test calls may be programmed for any path.
7.4.2 Polling Calls
Polling calls may be set to occur at regular intervals. A single timer exists for this. If programmed to 0,
no polling calls will occur. The period may be programmed from 0 to 99. The units may be selected
from Seconds, Minutes, Hours or Days.
Polling calls may only be programmed on the GPRS and LAN paths.
Polling calls differ from alarm calls in several ways:
1. The APN (Access Point Name), IP address and port numbers are programmed
independently of the alarm details.
2. Only one call attempt is made upon polling timer expiry.
3. The APN will only be changed if the previous polling call was unsuccessful.
Note: No polling calls will occur in SIA format. They will be in Fast Format 8 or 16 if the polling data is
1 or 2 characters respectively or in Contact ID format otherwise.
7.4.3 Test Call, Line Monitoring and NVM Input Data
Programming the Test Call, Line Monitoring and Input message strings in the NVM should be done as
follows (it is assumed that the reader is familiar with Fast Format, Contact ID or SIA. If not, please
refer to the appropriate alarm format specification documents).