MODEL 7748 SINGLE CHANNEL RS530 DB25 A/B SWITCH W/CUTOFF, TELNET AND GUI
Electro Standards Laboratories, Inc.
(401) 943-1164
www.electrostandards.com - pg 12 - Pub. 4703-02
If use of the DeviceInstaller software is not something that can be done
in a particular circumstance, please consult Electro Standards for
specialized and tailored instructions on finding the unit on the network.
Unreachable Status in Red
If the desired device shows up in red and says “Unreachable”, typically
with an IP address that starts with “169” as the first octet, then the IP
Address will need to be reconfigured (see Figure 6). Alternatively, the
unit can be power cycled while the unit’s remote port is connected to the
network.
The reason for the “Unreachable” status has to do with a failure to
obtain an IP address through DHCP. When a unit is configured for
DHCP, upon power up, it will spend a certain period of time (typically a
few minutes) attempting to obtain an IP address from a DHCP server. If
no server can be found, the unit will assign itself an IP Address via its
AutoIP protocol. This AutoIP assignment is what allows the unit to still
be found via DeviceInstaller. It is strongly recommended to keep AutoIP
enabled if DHCP is in use.
Figure 6: Unreachable unit shown in red in DeviceInstaller
Static/ IP Address Configuration
The switch must be configured to use a static IP address in order to be
compatible with the Java security protocols associated with the nature
of the Java code inside the switch. This is done through the
DeviceInstaller software. After finding the unit in DeviceInstaller,
regardless of whether it is unreachable or not, select the desired item in
the list in the right pane. Click the “Assign IP” button along the top
menu bar (see Figure 5 or Figure 6). Follow the prompts shown either
to assign a static IP address.
Note that if the unit was unreachable, the unit can be re-assigned to
DHCP to force the unit to search for a DHCP server again and obtain an
IP address.
Setting a static IP address does override both DHCP and AutoIP,
meaning that the unit will always come up with that static IP address.
Note that this may cause conflicts if another device on the network is
using the same IP address, as the unit will not change its IP address
