QGE 100 • Reference Information
50
50
The following is an example of an
invalid
Class C addressing scheme:
Device
IP Address
QGE 100 viewing computer
208.132.180.41
QGE 100 encoder 1
192.157.180.42
QGE 100 encoder 2
209.100.123.43
NOTE:
The above addresses are invalid because the network identifier for each
address is not the same even though each IP address is unique.
You can perform a test from your computer to check that a device at a particular address
is responding correctly or to determine its address (see “
Pinging for the IP Address
”).
Subnet Mask
The subnet mask is another 32-bit binary number that is used to “mask” certain bits of
the IP address. This provides a method of extending the number of network options for
a given IP address. It works by allowing part of the host identifier to be used as a subnet
identifier.
It is important that you set the correct value for the subnet mask. The basic values depend
on the class of IP address being used.
Class Name
Subnet Mask
Class A
255.0.0.0
Class B
255.255.0.0
Class C
255.255.255.0
See “
Subnetting, a Primer
” on page 51 for more information.
Pinging for the IP Address
To access the QGE 100 via the Ethernet port, you need the encoder IP address. If the
address has been changed to an address comprised of words and characters, the actual
numeric IP address can be determined using the Ping utility. If the address has not been
changed, the factory-specified default is 192.168.254.254.
Ping can also be used to test the Ethernet link to the QGE 100
.
Ping to determine the Extron IP address
The Microsoft Ping utility is available at the command prompt. Ping tests the Ethernet
interface between the computer and the encoder. It can also be used to determine the
actual numeric IP address from an alias and to determine the web address.
Ping the QGE as follows:
1.
From the Windows
Start
menu, select
Run...
. The Run window opens.
2.
In the
Open
text field, enter
command
.
3.
Click
OK
. A command window opens.
