Echelon SmartServer 2.2 User Manual
Page 180
SmartServer
2.2 User’s Guide
181
4. You can configure the following Web connection properties.
Name
Displays the network path of the target data point in the following format:
<network>/<channel>/<device>/<functional block>/<data point>. This
field is read-only.
Connection
Property
Service Type
Web Connections
Web connections use the Acknowledged Web Connection messaging
service. This means that the sending device expects to receive confirmation
from the receiving device that a data point update was delivered. The
sending application is notified when an update fails, but it is up to the
developer of the sending device to handle the notification in the device
application.
Acknowledged service is very reliable; however, it can create excessive
message traffic, especially when a single source or target data point is a
member of numerous Web connections.
L
ON
W
ORKS
Connections
Select one of the following messaging service types for a L
ON
W
ORKS
connection. These message service types vary in reliability and resources
consumed. Note that all L
ON
W
ORKS
connections created in the OpenLNS
tree use subnet/node ID addressing. This means that a message packet
travels from the sending device to the destination device using the 2-byte
logical address of the destination device in the network.
Acknowledged LonConnection. The sending device expects to
receive confirmation from the receiving device or devices that a
network variable update was delivered. The sending application is
notified when an update fails, but it is up to the developer of the sending
device to handle the notification in the device application.
While acknowledged service is very reliable, it can create excessive
message traffic, especially for large fan-out or polled fan-in
connections. When acknowledged messaging is used, every receiving
device has to return an acknowledgment.
Acknowledged messaging can be used with up to 63 receiving devices,
but an acknowledged message to 63 devices generates at least 63
acknowledgements—more if any retries are required due to lost