44 en | Panel and Area Wide Parameters D9412GV4/D7412GV4/D7212GV4
F.01U.218.312 | 04 | 2012.03 Program Entry Guide Bosch Security Systems, Inc.
When the control panel first powers up, the first Heartbeat Poll for Path 1 is sent and is
acknowledged in 1 sec. 120 sec after the first Heartbeat Poll is sent, the second Heartbeat
Poll for Path 1 is generated and sent to the central station receiver.
Example of Heartbeat as shown in Figure 3.1, Page 44:
– Path # Poll Rate is set to 120 sec
– Path # Ack Wait time is set to 1 sec
– Path # Retry Count is set to 3
Figure 3.1 Poll Rate Timeline
Example of Retry Count:
An acknowledgment of the heartbeat was not received within 10 sec. The control panel sends
the next Heartbeat Poll after the first 10-sec ACK wait period expires. If the central station
does not acknowledge this Heartbeat Poll, the control panel continues to re-send. When the
resend count is reached, the control panel declares this path as failed (and generates the
Comm Trouble SDI ## Event). The control panel continues to re-send the Heartbeat Poll at the
original poll rate time until it receives an acknowledgment, even after declaring a Comm
Trouble.
When the control panel receives acknowledgment from the central station, the control panel
returns to the normal Poll Rate (which, in this example, is 120 sec).
If more than one SDI Path is used, the control panel handles them on a successive basis. For
example, if acknowledgment from SDI Path 1 is not received within 10 sec (using the previous
example), the control panel moves to SDI Path 2 to send its Heartbeat Poll (and subsequently
waits for the ack) before returning to SDI Path 1 to re-send its heartbeat.
Entries are made in one-sec increments.
Callout Description
1 Heartbeat Poll sent
2 Acknowledgment received
3 Second Heartbeat Poll sent
4 No acknowledgment, Heartbeat re-sent, retry #1
5 No acknowledgment, Heartbeat re-sent, retry #2
6 Path declared failed
7 10-sec interval
8 Additional Heartbeats sent at the poll rate time until acknowledged
NOTICE!
If Heartbeat Polls are enabled to send by an SDI path, and the Path # Ack Wait time is
exceeded, a COMM TRBL SDI ## event occurs. When this condition occurs, all events routed
to this path go immediately to the backup path destination.
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