ControlByWeb WEBRelay-10+ User Manual page 31

WebRelay-10 Plus™ Users Manual
"Remote Services" is ideal for installations where the server and WebRelay-10 Plus™ are installed on
different networks. This is especially useful when each WebRelay-10 Plus™ is installed on a separate
private network. For example, if the user doesn't control the network connections where WebRelay-10
Plus™ is installed, "Remote Services" would initiate a TCP connection over the Internet with the control
computer. Since WebRelay-10 Plus™ initiates the connection, the control computer doesn't have to know
the IP address of WebRelay-10 Plus™. This means that WebRelay-10 Plus™ can be installed using
DHCP. In addition, no special router configuration is required. This makes the network installation of
WebRelay-10 Plus™ very simple, and since no incoming ports need to be opened in the router, security is
not compromised. See the Advanced Network Tab for more information.
WebRelay-10 Plus™ can be configured to establish a connection when triggered by an event, such as an
Outlet state changing. This is done by setting the Remote Service/SNMP checkbox in the setup tabs.
When an event occurs and a connection is open, the state.xml file is sent.
If a connection is not open and Remote Services is enabled, a connection will be established by sending
the connection string. Once the connection is established state.xml will be sent.
Connection String
With Remote Services enabled, a connection attempt will be made periodically according to the
Connection Interval setting in the Advanced Network setup tab. The Connection String is a user-defined
character string configured in the Advanced Network tab.
The connection string is also sent at the same interval once the connection is open. The external server is
responsible for closing the connection when it is done.
Xytronix Research & Design, Inc. Page 31