WebRelay Users Manual
from LinkSys, Dlink, and Netgear perform proxy server functions. If a proxy server is used, WebRelay
will not be accessible from the Internet until the proxy server is properly configured (forward proper port
to WebRelay). This information is mentioned for convenience but details of setting up a configuration
such as this is beyond the scope of this manual.
If WebRelay is used on a private network only and is NOT used over the Internet, a routable IP address
is not necessary. This may be the case when WebRelay is used to control (or monitor) a device in
another room or a nearby building.
If WebRelay will be installed on a simple, private network that does not connect to the Internet, the
default IP address may be used as long as no other device on the network uses the same address. If
multiple WebRelay units are installed on the same network, each unit must have its own unique IP
address. For example, WebRelay comes from the factory with a default IP address of 192.168.1.2. If
multiple units are used, change the IP address for each unit (192.168.1.3, 192.168.1.4, 192.168.1.5
etc.).
Netmask
This specifies the size of the local network. This must be obtained from the network administrator. By
default, the netmask is set to 255.255.255.0.
Broadcast
This specifies the broadcast address. This must be obtained from the network administrator. By default,
this is set to 192.168.1.255.
Gateway
This specifies the IP address of the gateway router. This must be obtained from the network
administrator. By default, this is set to 192.168.1.1.
TCP Port
This specifies the TCP port used for communications with WebRelay. By default, the port is set to 80
which is the standard http port. It is recommended that the port not be changed without an
understanding of TCP/IP and ports.
Changing the port can be useful for accessing multiple WebRelay devices which are installed behind a
gateway router on a private network that uses non-routable IP addresses (192.168.x.x, 10.x.x.x, and
172.16.x.x through 172.31.x.x are non-routable or private IP addresses). In this case, each WebRelay
unit would be assigned a different port (for example 8000, 8001, 8002, etc). The gateway router would
be set up to forward all traffic for each of the assigned ports to the IP address of the WebRelay unit
which uses that port. The WebRelay units could then be accessed from outside the private network by
entering the IP address of the gateway and the port for the desired WebRelay unit.
Note: Whenever any port is assigned other than port 80, all communications with that WebRelay
device
must include the port. For example, if WebRelay is assigned port 8000, access to the setup page would
require the following URL to be entered; http://192.168.1.2:8000/setup.html.
See Appendix C:
Accessing the WebRelay Over the Internet
for further information of configuring a
router to allow access to a WebRelay behind a gateway router.
Modbus Port
This specifies the port used for Modbus/TCP communications with the WebRelay. By default this is set
to port 502 which is the standard Modbus port. Modbus is a messaging structure protocol used in the
industrial, manufacturing, control and automation industries. It is an open protocol and offers
interoperability with software and devices from other manufacturers. If Modbus is not used, this setting
can be ignored. Modbus communications are disabled whenever the control password is enabled.
Speed
This option sets the data rate of the Ethernet port. Either 10Mbps or100Mbps can be selected. The
100Mbps option offers faster communications but the amount of data to and from WebRelay is so small
that users will not likely notice much of a difference. When WebRelay is set to 10Mbps, it draws less
power and runs a little cooler which provides a longer service life. IT IS RECOMMENDED THAT THIS
Xytronix Research & Design, Inc.
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