Revision 3.1
WebRelay
TM
Users Manual
Example (to connect a 24VDC signal voltage to WebRelay
TM
with a 3-11VDC input range):
R = (24-9)/0.020=750 Ohm resistor. The resistor must be at least (24-9) x 0.020 = 0.3 Watts so use a ½
Watt resistor.
2.3 Establishing Communications for Setup
WebRelay
TM
is set up using a web browser. The first task is to establish communications between a computer and the
WebRelay
TM
device so that the browser-based configuration can begin. To do this, the computer and WebRelay
TM
must be physically connected to the same network and both must have IP addresses on the same network. There are
two ways to set up the computer and WebRelay
TM
so that they are on the same network. The first way (Option 1), is
to change the IP address of WebRelay
TM
to an address that is on the same network as the computer. The second way
(Option 2) is to change the IP address of the computer to an address that is on the same network that WebRelay
TM
is
set to by default.
2.3.1 Option 1: Assign a temporary IP address to WebRelay
TM
This option is used to TEMPORARILY assign an IP address to WebRelay
TM
without the need to change
the IP address of the configuration computer. Note that WebRelay
TM
will only use this IP address as long
as power is maintained. Once power is lost and restored, WebRelay
TM
will use the IP address assigned in
the setup page and not the temporary address assigned here. This means that once communications are
established, the desired IP address should be entered into the network setup page using the browser.
To assign the temporary IP address...
1.
Make sure WebRelay
TM
and the configuration computer are connected to the same physical
network. This will not work through routers or gateways.
2.
Assign the address as follows...
Windows
:
Open a Command Prompt (on Windows XP, select START, then RUN, then type “cmd”).
Type...
arp -s {new IP address} {serial number of WebRelay
TM
}
Note: IP address format is: xxx.xxx.xxx.xxx
Serial number format is: ss-ss-ss-ss-ss-ss
For example, to set a WebRelay
TM
device (with serial number 00-0C-C8-01-00-01 ) to
10.10.10.40 the following command would be used.
arp -s 10.10.10.40 00-0c-c8-01-00-01
Next, type...
ping -l 102 {new IP address}
For example, if the new IP address is 10.10.10.40, the following command would be
used.
ping -l 102 10.10.10.40
Linux/Unix:
Open a terminal, change to root user (su -, then enter root password).
Type...
arp -s {new IP address} {serial number of WebRelay
TM
}
Xytronix Research & Design, Inc.
page 17
