Specifications

Revision 2.4 WebRelay-Quad™ Users Manual
An example screenshot of a gateway router configuration is given below. This setup allows
seven ControlByWeb™ products to be accessed on a private network behind a gateway
router. Note that this screenshot is simply an example of a typical router setup page. Routers
will vary. In the example, the seven ControlByWeb™ products are assigned IP addresses of
10.10.10.41 to 10.10.10.47. The first device labeled WebRelay-Quad 1 has an IP address of
10.10.10.41 and is assigned port 8001. Note that in the WebRelay-Quad™ setup page (under
Network settings tab), TCP Port 8001 must be specified for this device. The second device,
labeled WebRelay-Quad 2 has an IP address of 10.10.10.42 and is assigned port 8002. This
WebRelay-Quad™ must have its TCP Port set to 8002 in it's network settings page. This
pattern continues through 10.10.10.77 which is assigned the port 8007. To access the
ControlByWeb™ units from the Internet, enter the IP address of the gateway plus the port
number of the desired device.
Modbus Port:
This specifies the port used for Modbus/TCP communications with WebRelay-Quad™. By
default this is set to port 502 which is the standard Modbus port. For users not familiar with
Modbus, Modbus is a messaging structure protocol used in industrial manufacturing control
and automation. 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. Both 10Mbps and 100Mbps can be
selected. The 100Mbps option offers faster communications but the amount of data to and
from WebRelay-Quad™ is so small that users will not likely notice much of a difference. When
WebRelay-Quad™ is set to 10Mbps, it draws less power and runs a little cooler which
translate into a longer product life. IT IS RECOMMENDED THAT THIS SETTING BE LEFT AT
10MBPS UNLESS THE USER HAS A SPECIFIC REASON TO USE 100MBPS.
Mode
This option allows the Ethernet port to be set to Half Duplex or Full Duplex. Legacy Ethernet
operates in Half Duplex mode which means that devices can either send data or receive data,
but not both at the same time. Full duplex means that devices can send and receive data at
the same time.
Xytronix Research & Design, Inc. page 23