Revision 3.1
WebRelay
TM
Users Manual
2.2.2 Network Connection
Connect the Ethernet port to a 10 Base T or 10/100 Base T Ethernet connection. This typically connects to
an Ethernet hub, switch, or router. For configuration, WebRelay
TM
may be connected directly to the
Ethernet port on a computer using a “crossover” cable. Otherwise, for connection through a hub or router,
a standard “straight-thru” cable should be used.
2.2.3 Relay Connection
The relay contacts internally connect directly to the terminal connector. No internal fuse is provided. If the
power source connected to the relay contacts can deliver more than rated maximum contact current, an
external fuse or circuit breaker must be used. Direct access to Common, Normally Open, and Normally
Closed contacts are provided. The relay contacts may be wired in series with the power source for a device
that will be controlled (the load).
For loads greater than the maximum relay contact rating, an external relay may be used. The illustration
below shows how a 20-Amp motor can be controlled using an external relay. In the example, WebRelay
TM
controls the external relay and the external relay controls the load.
Many of the illustrations in this manual show WebRelay
TM
contacts wired in series with a power source,
which allows the power for the device to be switched on and off remotely. In many cases, however, it is
useful to control other functions and not just power. One way to do this is to connect relay contacts in
parallel with pushbutton switches within a device. An example is useful to illustrate this. Suppose you
have a gate controller system that has a pushbutton switch that opens a gate when pressed. The button that
controls the gate is located on one side of a building, but you want to be able to open the gate from a room
on the other side of the building. Since the building is pre-wired for networking, it is a simple task to
accomplish this goal by connecting the WebRelay
TM
contacts in parallel with the pushbutton. An
illustration of this is shown below. In doing this, users can now operate the gate with the existing
Xytronix Research & Design, Inc.
page 15
25 Amp
Solid State Relay
WebRelay
Power Supply
(Powers WebRelay)
(5VDC or 9-28VDC)
240V
AC Power
Source
(with circuit
breaker)
Device to be
Controlled
Vin-
NO
C
+
Input
-
Line
Neutral
Vin+
