Echelon i.LON SmartServer 2.0 Power Line - Manual (Page 23)

i.LON SmartServer 2.0 Power Line Repeating Network Management Guide 9
5. If a network message fails, a data point and its device are marked offline. You can select the Use
Minimal Offline Time check box so that all the data points on the offline device with pending
network messages (read/write requests, polls, or heartbeats) are marked offline and network
messages are not sent to them. This ensures that network performance is not impacted by an
offline device.
You can also set the minimum period of time (in seconds) that the SmartServer waits before
transmitting network messages to offline data points. During this period, an offline device
transmits an OFFLINE status in response to data point requests. Once the Minimal Offline Time
elapses, the SmartServer sends a read/write request to one offline data point. If the read/write
request succeeds, the data point and its device are marked online, and all cached read/write
requests for the offline data points on the device are executed. If you do not configure this
property on a power line repeating channel, it is set to 60 seconds.
6. Optionally, you can set the Use Offline Delay property to specify the period of time (in seconds)
that the SmartServer waits before marking a data point and its parent device offline (red) in the
SmartServer tree after the LON driver detects that the data point is offline.
For example, if you poll a data point every 5 minutes and you set Use Offline Delay to 1 hour, it
takes 12 polls for the data point and its parent device to be marked offline—even though the LON
driver detected that it could not communicate with the data point after the first poll.
7. Optionally, you can click Advanced to set the retry timer and retry counts that determine the
frequency in which network messages are re-sent to a device after no confirmation of delivery is
received. Although you can change these properties, it is recommended that you use the default
transmit timer (512 ms) and the default retry count (3).
Use Transmit
Timer You can change the interval (in milliseconds) the final repeating device in
the repeating chain (the proxy agent) waits for confirmation before
resending network messages to the target device. The default value is 512
ms. Note that the SmartServer may use a longer interval than the one you
specify if it determines that a longer interval is needed.
Note that the retry interval used by the devices on the repeating chain prior
to the proxy agent is calculated based on the total transaction time