Echelon SmartServer 2.2 Uživatelský manuál stáhnout pdf (Strana 180)

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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.

LONWORKS Connections

Select one of the following messaging service types for a LONWORKS

connection. These message service types vary in reliability and resources

consumed. Note that all LONWORKS 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

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