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Web Server
location. This can be used in an environment where a web server on the Internet provides a custom web
page to XW-111 and other ControlByWeb products. Users access the XW-111 through the web server
rather than communicating directly with it. This method is sometimes referred to as "web services" and
allows programmers to create powerful, custom web pages to multiple devices using the web
programming languages of their choice.
Remote services initiates the connection to the external web server (rather than the web server initiating
communications to the XW-111). This has two main benefits. First, the web server does not need to
know the IP address of XW-111. This means that XW-111 can get its IP address dynamically from a
DHCP server, simplifying the installation. Second, since the connection from XW-111 is outgoing, rather
than incoming, the local router on the network where XW-111 resides doesn't need to be configured to
forward sockets. This simplifies the installation. Since the router configuration is not modified, the risk of
compromising security on the local network is eliminated.
In order to allow remote services to operate is a power conscious fashion, remote services will
disconnect from the remote services server if it is the only enabled service (modbus and web server are
disabled) and external power is not available. If externally powered, remote services will be fully
available until external power is lost. However, if remote services is enabled but disconnected due to no
external power, it will still connect and push the state.xml if a temperature alarm occurs that has remote
services state message enabled. Once the message is sent, remote services will disconnect and low
power modes will be resumed. If power is restored, remote services will reconnect to the server and stay
connected.
Page 18
XW-111™ Wi-Fi Digital Sensor Users Manual
Xytronix Research & Design, Inc.
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