pathway 7748 User manual

MODEL 7748
Single Channel RS530 DB25
A/B Switch with Cutoff Position,
Telnet and GUI
Catalog# 307748

MODEL 7748 SINGLE CHANNEL RS530 DB25 A/B SWITCH W/CUTOFF, TELNET AND GUI
Electro Standards Laboratories, Inc. [phone]
www.electrostandards.com - pg 1 - Pub. 4703-02
INFORMATION
WARRANTY AND LIMITATION OF LIABILITY
All equipment, software, and documentation is sold subject to the mutual agreement that it is
warranted by the company to be free from defects of material and workmanship but the
company shall not be liable for special, indirect or consequential damages of any kind under
this contract or otherwise. The company’s liability shall be limited exclusively to replacing or
repairing without charge, at its factory or elsewhere at its discretion, any material or
workmanship defects which become apparent within one year from the date on which the
equipment was shipped, and the company shall have no liability of any kind arising from the
installation and/or use of the apparatus by anyone. The buyer by the acceptance of the
equipment will assume all liability for any damages which may result from its use or misuse
by the buyer, his or its employees, or by others.
The warranties of the company do not cover, and the company makes no warranty with
respect to any defect, failure, deficiency or error which is:
Not reported to the company within the applicable warranty period; or
Due to misapplication, modification, dis-assembly, abuse, improper installation by others,
abnormal conditions of temperature, dirt, or corrosive matter; or
Due to operation, either intentional or otherwise, above rated capacities or in an otherwise
improper manner.
The company believes that the information in this manual is accurate. The document has
been carefully reviewed for technical accuracy. In the event that technical or typographic
errors exist, the company reserves the right to make changes to subsequent editions of this
document without prior notice to holders of this edition. The reader should consult the
company if errors are suspected. In no event shall the company be liable for any damages
arising out of or related to this document or the information contained in it.
There are no other warranties, expressed or implied including the implied warranties of
merchantability and fitness for a particular purpose.
COPYRIGHT
Under the copyright laws, this publication may not be reproduced or transmitted in any form,
electronic or mechanical, including photocopying, recording, storing in an information
retrieval system, or translating, in whole or in part, without the prior consent of Electro
Standards Laboratories.
May 11, 2016 Electro Standards Laboratories. All rights reserved.
Electro Standards Laboratories
36 Western Industrial Drive
Cranston, RI 02921 – USA
Tel: [phone] Fax: [phone]

MODEL 7748 SINGLE CHANNEL RS530 DB25 A/B SWITCH W/CUTOFF, TELNET AND GUI
Electro Standards Laboratories, Inc. [phone]
www.electrostandards.com - pg 2 - Pub. 4703-02
SOFTWARE RESTRICTIONS
IMPORTANT - READ CAREFULLY. By employing the Remote SNMP Interface via the LAN
access port on the switch and accessing its embedded software, you are agreeing to be
bound by the terms of this agreement. This is a legal agreement between you (either an
individual or an entity) and Electro Standards Laboratories (“ESL”). If you do not agree to all
the terms of this agreement, promptly return the switch and the accompanying items
(including all written materials and their containers) to the place you obtained them for a full
refund.
1. Copyright. The embedded SOFTWARE is owned by ESL or its suppliers and is
protected by United States copyright laws and international treaty provisions.
Therefore, you must treat the embedded SOFTWARE like any other copyrighted
material. You may not copy the written materials accompanying the embedded
SOFTWARE.
2. Other Restrictions. You may not reverse engineer, decompile, or disassemble
the embedded SOFTWARE.

MODEL 7748 SINGLE CHANNEL RS530 DB25 A/B SWITCH W/CUTOFF, TELNET AND GUI
Electro Standards Laboratories, Inc. [phone]
www.electrostandards.com - pg 3 - Pub. 4703-02
TABLE OF CONTENTS
INFORMATION......................................................................................1
WARRANTY AND LIMITATION OF LIABILITY....................................1
COPYRIGHT..........................................................................................1
SOFTWARE RESTRICTIONS...............................................................2
TABLE OF CONTENTS.........................................................................3
TABLE INDEX .......................................................................................4
TABLE OF FIGURES ............................................................................4
INTRODUCTION....................................................................................5
INSTALLATION.....................................................................................6
POWER SUPPLY....................................................................................6
ETHERNET REMOTE PORT PINOUT..........................................................7
OPERATION..........................................................................................8
MANUAL CONTROL................................................................................8
REMOTE TELNET COMMANDS.................................................................9
SWITCH POSITION ON POWER DOWN ......................................................9
REMOTE ETHERNET CONNECTIONS ..............................................10
VERIFY THE HARDWARE.......................................................................10
IF NO LAN IS AVAILABLE,USE A CROSSOVER CABLE...............................10
IF CONNECTING TO A LAN USE 10/100BASE-T CABLE............................10
10/100-BASE-T LAN SETUP ..............................................................11
NETWORK SETUP................................................................................11
GETTING DEVICEINSTALLER .................................................................11
FINDING THE IP ADDRESS OF THE SWITCH.............................................11
Unreachable Status in Red ..........................................................12
STATIC/IP ADDRESS CONFIGURATION ..................................................12
RESETTING THE REMOTE ETHERNET PORT............................................13
REMOTE TELNET SESSION..............................................................14
TELNET IN WINDOWS XP .....................................................................14
TELNET IN WINDOWS VISTA/7/8............................................................14
TELNET IN LINUX/MAC OS X................................................................14
TELNET SESSION ................................................................................14
REMOTE GRAPHICAL USER INTERFACE SOFTWARE..................15
SOFTWARE FEATURES.........................................................................16

MODEL 7748 SINGLE CHANNEL RS530 DB25 A/B SWITCH W/CUTOFF, TELNET AND GUI
Electro Standards Laboratories, Inc. [phone]
www.electrostandards.com - pg 4 - Pub. 4703-02
JAVA SECURITY POLICIES ....................................................................17
CHANGING SWITCH POSITION AND LOCK STATUS ...................................20
RECONFIGURING THE IP ADDRESS........................................................21
TROUBLESHOOTING.........................................................................24
SWITCHING ISSUES .............................................................................24
REMOTE CONNECTION ISSUES .............................................................24
REMOTE LOGIN ISSUES........................................................................25
SPECIFICATIONS...............................................................................26
CUSTOMER & TECHNICAL SUPPORT.............................................27
CUSTOMER SUPPORT..........................................................................27
TECHNICAL SUPPORT ..........................................................................27
TABLE INDEX
Table 1: Ethernet Remote Port Pinout....................................................7
Table 2: Remote Control Commands.....................................................9
TABLE OF FIGURES
Figure 1: Model 7748 Rear Panel ..........................................................6
Figure 2: Model 7748 Front Panel..........................................................8
Figure 3: Crossover Cable connection for no LAN...............................10
Figure 4: Connecting to a LAN with 10/100Base-T cable.....................10
Figure 5: Finding the IP address in DeviceInstaller..............................11
Figure 6: Unreachable unit shown in red in DeviceInstaller..................12
Figure 7: GUI in a Standard Web Browser...........................................15
Figure 8: GUI in DeviceInstaller ...........................................................16
Figure 9: Java Security Settings...........................................................18
Figure 10: Java Security Warning ........................................................19
Figure 11: Change the switch position and lockout from the GUI.........20
Figure 12: Reconfiguring the IP Address..............................................21
Figure 13: Windows Security Alert .......................................................22
Figure 14: Static IP address.................................................................22
Figure 15: IP address is updated. ........................................................23
Figure 16: Refresh Browser after update .............................................23

MODEL 7748 SINGLE CHANNEL RS530 DB25 A/B SWITCH W/CUTOFF, TELNET AND GUI
Electro Standards Laboratories, Inc. [phone]
www.electrostandards.com - pg 5 - Pub. 4703-02
INTRODUCTION
The PathWay® Model 7748 Single Channel DB25 A/B Switch with
Cutoff Position, Telnet and GUI allows the user the capability of sharing
a single port interface device connected to the “COMMON” port among
two other devices connected to the “A” and “B” ports with remote access
functionality. Remote Control access can be accomplished using an
Ethernet 10/100BASE-T connection and either Telnet commands or
Graphical User Interface. The Model 7748 is enclosed in a 1U, full rack
size, all metal black chassis designed to provide EMI/RFI shielding and
fit in a standard 19” rack.
Features:
•
The switch ports are transparent to all data.
•
All (25) pins of the DB25 interface are switched via break-
before-make electromechanical relays.
•
On power loss, unit reverts to a cutoff position that isolates all
communication ports.
•
When power is restored, the unit automatically switches to the
default position set by the user.
•
Front panel pushbutton control.
•
Control of the switch position from a 10/100-Base-T LAN
Ethernet environment.
•
Remote Control Telnet command interface or Graphical User
Interface that allow the user to control switch position, lockout
front panel operations and obtain switch status.
•
Front panel LED’s display present position and power status.

MODEL 7748 SINGLE CHANNEL RS530 DB25 A/B SWITCH W/CUTOFF, TELNET AND GUI
Electro Standards Laboratories, Inc. [phone]
www.electrostandards.com - pg 6 - Pub. 4703-02
INSTALLATION
This section describes the physical connections required to start
operating the Model 7748.
Figure 1: Model 7748 Rear Panel
The rear panel view of the switch is shown in the above figure. On the
rear of the switch are the following ports:
•
POWER – Phoenix (F), External Power Supply Input connector.
•
REMOTE – RJ45 (F), 10/100BASE-T LAN access Ethernet
Remote Control port.
•
COM – DB25 (F), the “COMMON” or shared device port.
•
A – DB25 (M), the “A” device port.
•
B – DB25 (M), the “B” device port.
Power Supply
After all the proper connections have been made, plug the Model 7748
into a 100VAC/240VAC, 50Hz/60Hz wall receptacle using the supplied
12VDC, 500mA, UL listed and LPS approved, 2-prong US non-polarized
NEMA 1-15P plug wall mount power supply, P/N 516682.
Option: Wide Range Power Module, (Cat. No. 517277),
100VAC/240VAC, 50Hz/60Hz, IEC 60320 C14 inlet, can be ordered for
use in place of the standard NEMA 1-15P plug power module that is
included with the unit. Ideal for international applications.
Upon power up the Model 7748 will process its power up routine. When
the routine is done the front panel LED's will indicate the present
position of the unit. At this point the unit is ready for operation.
Power
A, B, and COM ports Remote
Model 7748 Rear Panel

MODEL 7748 SINGLE CHANNEL RS530 DB25 A/B SWITCH W/CUTOFF, TELNET AND GUI
Electro Standards Laboratories, Inc. [phone]
www.electrostandards.com - pg 7 - Pub. 4703-02
Ethernet Remote Port Pinout
SIGNAL NAME PIN #
DIRECTION
TRANSMIT DATA A (XMT-A) 1 OUTPUT
TRANSMIT DATA B (XMT-B) 2 OUTPUT
RECEIVE DATA A (RCV-A) 3 INPUT
RECEIVE DATA B (RCV-B) 6 INPUT
Table 1: Ethernet Remote Port Pinout

MODEL 7748 SINGLE CHANNEL RS530 DB25 A/B SWITCH W/CUTOFF, TELNET AND GUI
Electro Standards Laboratories, Inc. [phone]
www.electrostandards.com - pg 8 - Pub. 4703-02
OPERATION
The Model 7748 can be operated either by the front panel or through its
Remote port.
Figure 2: Model 7748 Front Panel
Manual Control
The front panel view of the Switch System is shown in the above figure.
On the front of the switch are the following controls and indicators:
•
A, B INDICATORS – Red LED’s indicate the switch position as
well as the power status.
oThe LED in the steady state indicates the position of
the switch.
oIf the front panel pushbutton is locked and the button
is pressed, both LED’s will light until the pushbutton is
released.
oWhen first powering up, both LED’s will light and flash
during the power up routine.
oIf the Remote Ethernet port is reset on power up, both
LED’s will light and flash a few times for several
seconds until completing its routine and displaying the
present position.
•
MANUAL PUSHBUTTON – The front panel pushbutton allows
the switch position to be changed.
oDepressing and releasing the pushbutton allows the
user to toggle the switch position.
oPushbutton control can be inhibited if locked out
remotely.
oPressing and holding the pushbutton on power up will
initiate the Remote Ethernet port reset routine.
Model 7748 Front Panel
Pushbutton and LED’s

MODEL 7748 SINGLE CHANNEL RS530 DB25 A/B SWITCH W/CUTOFF, TELNET AND GUI
Electro Standards Laboratories, Inc. [phone]
www.electrostandards.com - pg 9 - Pub. 4703-02
Remote Telnet Commands
All remote control commands are ASCII CONTROL commands. A
CONTROL command is created by pressing and holding the [CTRL] key
and the designated character key simultaneously. For example, to
create the CTRL-A command, simply press the [CTRL] and [A] keys on
the keyboard simultaneously then release both. Do not press the Enter
key at the end of a command. See Table 1 below for details.
Table 2: Remote Control Commands
Switch Position on Power Down
If power to the Model 7748 is lost, the switch will switch to the Cutoff
Position that isolates all communication ports.
Upon power restore, the unit will automatically switch to the Default
Position. This Default Position is configurable by the user through Telnet
Commands or the Graphical User Interface (GUI).
Command
Parameters
Function
Response
CTRL-A N/A switch to A xxx Position: A, <un/locked>
(Default Position: <A/B>)
CTRL-B N/A switch to B xxx Position: B, <un/locked>
(Default Position: <A/B>)
CTRL-L N/A Locks front
panel
xxx Position: <A/B>, Locked
(Default Position: <A/B>)
CTRL-U N/A Unlocks front
panel
xxx Position: <A/B>, Unlocked
(Default Position: <A/B>)
CTRL-D
<Position> A or B Sets default position After CTRL-D: 301 Enter 'A' or 'B' to set default position. After A or
B:
xxx Position: <A/B>, <un/locked>
(Default Position: <A/B>)
CTRL-P N/A Query for
current status
xxx Position <A/B> <un/locked>
<Auto Fallback/Manual Mode>
CTRL-V N/A firmware version
number
901 M7748, Firmware Version x.x,
Compiled <Date>

MODEL 7748 SINGLE CHANNEL RS530 DB25 A/B SWITCH W/CUTOFF, TELNET AND GUI
Electro Standards Laboratories, Inc. [phone]
www.electrostandards.com - pg 10 - Pub. 4703-02
REMOTE ETHERNET CONNECTIONS
Verify the Hardware
Verify that the switch is currently powered. If the user needs to directly
connect to the switch rather than through a LAN, a 10/100BASE-T
crossover cable will be necessary (ESL can provide this – p/n 984228-
006). This cable allows direct connection of the switch’s Remote LAN
port to a computer with a Network Interface Card (NIC).
If no LAN is available, use a Crossover Cable
If no LAN connection is available, the user can use a crossover cable.
Plug one end of the cable into the RJ45 Remote port on the rear of the
switch and the other end into the computer NIC as in Figure 3.
Figure 3: Crossover Cable connection for no LAN
If connecting to a LAN use 10/100Base-T Cable
Use a straight through 10/100BASE-T patchcord from the switch’s LAN
Remote port to a LAN connection, and likewise, reconnect the computer
used to configure the system via a standard, straight through patchcord
to the LAN as in Figure 4. ESL can provide this cable (p/n 984231-
006)..
Figure 4: Connecting to a LAN with 10/100Base-T cable.
Model 7748
CROSSOVER, RED
10/100BASE-T CABLE IN LIEU
OF A NETWORK
Model 7748
Straight thru
10/100BASE-T Cable
LAN Connection

MODEL 7748 SINGLE CHANNEL RS530 DB25 A/B SWITCH W/CUTOFF, TELNET AND GUI
Electro Standards Laboratories, Inc. [phone]
www.electrostandards.com - pg 11 - Pub. 4703-02
10/100-BASE-T LAN SETUP
Network Setup
The switch is configured from the factory to use DHCP to automatically
get its IP address from a DHCP server on the local area network when
connected to the network and powered up. Therefore, a DHCP server is
needed on the local area network for the initial configuration. After that
the switch can be configured to use a static IP address. To find the IP
address of a switch that it has gotten from the DHCP server or to
reconfigure the IP Address of the switch, use the Lantronix®
DeviceInstaller application.
Getting DeviceInstaller
DeviceInstaller requires Microsoft's .NET Framework version 4.0 or
higher. If the .NET Framework is not already installed, it must first be
installed. The .NET Framework can be downloaded from Microsoft’s
website, either as a web install, or as a standalone installation. The
latest version of DeviceInstaller can be downloaded from Lantronix’s
website.
Finding the IP Address of the Switch
After installing DeviceInstaller and opening it, the software will
automatically search for devices on the network. Once found, the
devices will be listed in the right pane (see Figure 5). Match the MAC
address on the rear of the unit to the MAC address (“Hardware
Address”) shown in DeviceInstaller to correctly identify the desired unit
and find the associated IP address.
Figure 5: Finding the IP address in DeviceInstaller
If the desired device is not found in the list at all, the unit may have been
previously set with a static IP address that is not compatible with the
current network’s subnet and configuration. In this case, it may be
necessary to reset the IP address. See section “Resetting the Remote
Ethernet Port” on page 16.

MODEL 7748 SINGLE CHANNEL RS530 DB25 A/B SWITCH W/CUTOFF, TELNET AND GUI
Electro Standards Laboratories, Inc. [phone]
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

MODEL 7748 SINGLE CHANNEL RS530 DB25 A/B SWITCH W/CUTOFF, TELNET AND GUI
Electro Standards Laboratories, Inc. [phone]
www.electrostandards.com - pg 13 - Pub. 4703-02
automatically. Therefore it is important that you consult your network
administrator for a correct static IP address in order to greatly reduce
the chance of conflicts.
Resetting the Remote Ethernet Port
The Remote Ethernet port can be reset to factory defaults. This is
especially useful in the event that an invalid IP address configuration is
set and the unit becomes inaccessible through the Remote Ethernet
port. To reset the IP address settings and any security settings (such
as password protection on the Telnet Configuration port), the following
steps must be performed:
•Power down the unit.
•While holding any front panel pushbutton, power the unit back
up. The pushbutton can be released once any of the LED’s on
the front panel light up steadily.
•The unit will run through its reset routine. While this is
occurring, all LED’s will flash sporadically until it has finished.
The entire process can take about up to 7 seconds.
Once the reset routine is complete, the unit will be ready for operation
without any further power cycling. It may be a few additional moments
before the Remote Ethernet port is accessible while the unit acquires an
IP address.

MODEL 7748 SINGLE CHANNEL RS530 DB25 A/B SWITCH W/CUTOFF, TELNET AND GUI
Electro Standards Laboratories, Inc. [phone]
www.electrostandards.com - pg 14 - Pub. 4703-02
REMOTE TELNET SESSION
Telnet can be used to connect to and command the switch. Before
connecting and starting a Telnet Session, first connect the switch in
accordance with the section entitled “Remote Ethernet Connections”.
Once the network and security settings have been configured, the unit is
ready for Telnet users to connect using a Telnet client.
Note that the default port for Telnet on this unit is 10001.
Telnet in Windows XP
Telnet in Windows XP can be done either through HyperTerminal, the
command line, or any other 3rd party software that supports Telnet (such
as PuTTY). When using the command line, the command format is:
telnet <ip address or host name> 10001
Telnet in Windows Vista/7/8
In versions of Windows after Windows XP, HyperTerminal has been
removed and the command line Telnet client has been disabled. To use
Telnet in these versions of Windows, either a 3rd party software solution
that supports Telnet can be used (such as PuTTY), or the Telnet client
can be enabled for the command line.
To enable the Telnet client for command line use, open the Control
Panel. Select “Programs” if in “Category” view. In either view, select
“Programs and Features”. There will be an option to “Turn Windows
features on or off” on the left. After clicking this, a dialog box will pop up
with a list of features. Find “Telnet Client” in the list, check the box for
that option, and press the “OK” button. Windows will take a few
moments to configure itself, but once this is complete, the Telnet
Command will be available through the command line.
The Telnet Command through the command line is the same as it was
in Windows XP.
Telnet in Linux/Mac OS X
Telnet is commonly built into distributions of Linux and Mac OS X, or is
readily available through a package manager or appropriate binary
distribution. Often, Telnet Sessions are accomplished through the
terminal. For example, in Ubuntu and Mac OS X, Telnet Sessions can
be started with the command:
telnet <ip address or host name> 10001
Telnet Session
The default port for Telnet on this unit is 10001. Once connected, there
will be no prompt and the unit will immediately be ready for command
entry and status. See the Remote Control Commands in Table 2.

MODEL 7748 SINGLE CHANNEL RS530 DB25 A/B SWITCH W/CUTOFF, TELNET AND GUI
Electro Standards Laboratories, Inc. [phone]
www.electrostandards.com - pg 15 - Pub. 4703-02
REMOTE GRAPHICAL USER INTERFACE SOFTWARE
To connect to the switch from a workstation or computer having access
to the LAN that the switch’s LAN port is connected to, simply launch a
standard web browser and type in the appropriate IP address. The
Java Applet will be automatically uploaded from the switch upon
connection. The environment requirement for the GUI is Java 1.7 and
above.
Figure 7: GUI in a Standard Web Browser
The Java Applet can also be accessed from the DeviceInstaller
application. To control the Model 7748 using DeviceInstaller, follow the
steps listed below.
•
Open your DeviceInstaller application by clicking "Start-
>Programs->Lantronix->DeviceInstaller->DeviceInstaller"
•
When the DeviceInstaller GUI opens up, the first task it
performs is to look for any Lantronix devices attached to the
local area network. When devices are found, the left pane of the
DeviceInstaller GUI (see Figure 8) will indicate so by displaying
information below "Local Area Connection" which is your own
local PC. You must then expand the tree of elements until you
reach the lowest level, which represents the IP address of your
actual device. When you do so, three tabbed panels will appear

MODEL 7748 SINGLE CHANNEL RS530 DB25 A/B SWITCH W/CUTOFF, TELNET AND GUI
Electro Standards Laboratories, Inc. [phone]
www.electrostandards.com - pg 16 - Pub. 4703-02
in the right-most pane as in Figure 8. Please select the pane
labeled "Web Configuration".
•
The IP Address of the switch will appear at the top of the panel,
along with a green ‘GO’ button. To launch the Model 7748 GUI,
simply click the ‘GO’ button.
Figure 8: GUI in DeviceInstaller
Software Features
•
Access User Interface via standard web browser.
•
Easy to use, simple point and click operation.
•
Remotely access to control or monitor the Model 7748.
•
Users can change the switch’s IP address and configuration.
•
LAN access gives users across the LAN or over the Internet
access to control if user network is configured accordingly.

MODEL 7748 SINGLE CHANNEL RS530 DB25 A/B SWITCH W/CUTOFF, TELNET AND GUI
Electro Standards Laboratories, Inc. [phone]
www.electrostandards.com - pg 17 - Pub. 4703-02
Java Security Policies
As of Java 7 update 51, stricter security policies enforced by the Java
Runtime Environment that runs the GUI will require additional
attention.Please install Java 8 update 25 which can be found at the link:
http://www.google.com/url?sa=t&rct=j&q=&esrc=s&frm=1&source=web
&cd=7&cad=rja&uact=8&ved=0CEcQFjAG&url=http%3A%2F%2Fjavadl
.sun.com%2Fwebapps%2Fdownload%2FAutoDL%3FBundleId%3D984
26&ei=MeOzVOrYN8qvogT454CICQ&usg=AFQjCNGZpaLP5IT6M3r6Y
0Dd491J4tXaLg.
The file name is jre-8u25-windows-i586.exe
Over time as more recent updates become available be sure to not
allow the Java Updater to uninstall Java 8 update 25 without first
contacting Electro standards Laboratories customer support to assure
that the newer updates are compatible with the switch software.
Due to the nature of this product, the GUI application can only be self-
signed. Because of this self-signing and the new security policies, the
Java security settings may need to be changed before use of the GUI is
allowed.

MODEL 7748 SINGLE CHANNEL RS530 DB25 A/B SWITCH W/CUTOFF, TELNET AND GUI
Electro Standards Laboratories, Inc. [phone]
www.electrostandards.com - pg 18 - Pub. 4703-02
To change these settings in Windows, open the Control Panel. While in
“Large icon” or “Small icon” view, select “Java”. On the “Security” tab,
move the slider down to medium (see Figure 9). Medium allows self-
signed application to run, while still alerting to all potential security
hazards on a case-by-case basis. Optionally, if the unit is set to a static
address, this can be added to the exception list here. More recent Java
updates allow only a minimum security level of “high” and require that
you enter the static IP address (for example: “http://10.0.0.233”) in the
exception list..
Figure 9: Java Security Settings

MODEL 7748 SINGLE CHANNEL RS530 DB25 A/B SWITCH W/CUTOFF, TELNET AND GUI
Electro Standards Laboratories, Inc. [phone]
www.electrostandards.com - pg 19 - Pub. 4703-02
When connecting to the GUI in a web browser, the security warning will
prompt for permission before continuing (see Figure 10). Please
confirm that the information presented regarding the name and location
is correct before proceeding. Note that the publisher will show as
“Unknown” since this was self-signed and not verified by a certificate
authority. Selecting the checkbox at the bottom and clicking the “Run”
button will allow the GUI to finish loading and be ready for operation.
Figure 10: Java Security Warning
.