ASCOM Elise3 Lite User manual

TD 92679GB
12 April 2011 Ver. D
Installation Guide
Elise3

TD 92679GB
12 April 2011 Ver. D
Installation Guide
Elise3
Contents
1 Introduction.......................................................................................................... 1
1.1 About this Document...................................................................................... 2
1.2 Abbreviations and Glossary ............................................................................. 2
1.3 Requirements.................................................................................................. 2
1.4 FCC Compliance Statements for Class B Digital Device.................................... 2
2 General Information ............................................................................................ 4
2.1 Licenses .......................................................................................................... 4
2.2 The MAC Address ........................................................................................... 4
2.3 Authentication and Administration ................................................................. 4
2.3.1 Authentication........................................................................................ 4
2.3.2 Administration........................................................................................ 4
3 Description............................................................................................................ 6
3.1 Overview of Connectors, Buttons and LEDs..................................................... 6
3.2 Label for IP Address/Host Name ...................................................................... 7
3.3 LED Indications ............................................................................................... 8
3.4 Operating Modes............................................................................................ 8
3.4.1 Normal Operation................................................................................... 8
3.4.2 Boot Mode ............................................................................................. 9
3.4.3 Demonstration Mode.............................................................................. 9
3.4.4 Troubleshoot Mode................................................................................. 9
4 Installation and Configuration.......................................................................... 10
4.1 Installation Procedure.................................................................................... 10
4.2 Mounting ..................................................................................................... 10
4.2.1 Wall Mounting...................................................................................... 10
4.2.2 Rack Mounting ..................................................................................... 11
4.3 Supply Voltage.............................................................................................. 14
4.3.1 Change Power Supply parameter.......................................................... 14
4.4 Connections ................................................................................................. 15
4.4.1 COM Ports (RS232 Communication with External Equipment)............... 15
4.4.2 Ethernet Ports....................................................................................... 15
4.4.3 A-bus connection to System 900........................................................... 15
4.4.4 LON Bus ............................................................................................... 16
4.4.5 Error Relay Output ................................................................................ 16
4.4.6 Connection of AUX Inputs and AUX Outputs........................................ 17
4.5 Accessing Elise3 ............................................................................................ 17
4.5.1 Access via the Network......................................................................... 17
4.5.2 Access via the Management port ......................................................... 18
4.6 Basic Configuration....................................................................................... 21

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4.6.1 Setup via the Setup Wizard................................................................... 21
4.6.2 Setup from the Advanced Configuration Page ...................................... 21
4.6.3 Change Secured Settings ...................................................................... 22
4.6.4 Clock Synchronization and Time Settings .............................................. 22
4.6.5 Time Synchronization............................................................................ 23
4.6.6 Message Distribution ............................................................................ 23
5 Working in Boot Mode ...................................................................................... 25
5.1 Set the Module in Boot Mode ....................................................................... 25
5.1.1 System Information............................................................................... 25
5.1.2 Network Settings .................................................................................. 26
5.1.3 Software Information............................................................................ 26
5.1.4 Install Software in Boot Mode ............................................................... 26
5.1.5 Return to Normal Operation ................................................................. 27
6 Run in Demonstration Mode............................................................................. 28
7 Maintenance....................................................................................................... 29
7.1 Software Management ................................................................................. 29
7.1.1 Installation of Software ......................................................................... 29
7.1.2 Create a Backup of the Software Settings ............................................. 29
7.1.3 Field Upgrade of the Boot Software ...................................................... 29
7.2 Restarting the Elise3...................................................................................... 30
7.2.1 Controlled Restart via the Restart Button............................................... 30
7.2.2 Forced Restart....................................................................................... 30
7.3 Reset Back to Factory Default Settings........................................................... 30
8 Troubleshooting Guide ...................................................................................... 31
8.1 Troubleshooting from Boot Mode ................................................................. 32
9 Related Documents ............................................................................................ 33
10 Document History ............................................................................................ 33
Appendix A: Move a license from ELISE2, to Elise3............................................ 34

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1 Introduction
The Elise3 module is the hardware platform for Linux based applications such as
messaging, alarm handling, administration and device management. The module can be
used independently but also works in combination with other modules or systems.
Elise3 comes in different variants; Elise3 Lite, Elise3 Standard, Elise3 LON/ISC and Elise3
LON/NSS.
The Elise3 Lite is intended for connections via IP only. It has two LAN connections, two USB
2.0 ports for communication with external devices, one mini-USB port for easy
management and is equipped with two galvanically isolated physical inputs and outputs.
The inputs can be used for trigger conditions which in turn can use the outputs for actions.
The Elise3 Standard has the same functionality as the Lite variant, but supports A-bus
connection to Ascom paging system and RS-232 communication with external systems.
The Elise3 LON variants has the same features as the Standard variant but is equipped with
a LON piggyback for connection to teleCARE local operating network (LON) and intended
for EU/EFTA only. The Elise3 LON/ISC has a LON interface for teleCARE M and Elise3 LON/
NSS for the Nurse Station Server application.
The license and supported features are application dependent and therefore described in
the application documentation.
Supply voltage: 100 – 240 V AC ±20%
12 – 24 V DC -25% / +20%
Current consumption: Max 275 mA at 100 V AC input
Max 1 A at 12 V DC input
Delivery includes: Elise3 hardwarea
The Getting started and Safety document:
“Elise3 – EMBEDDED LINUX SERVER INCLUDING SAFETY INSTRUCTIONS”
Two assembly brackets
Four screws size 3.5×40 together with four wall plugs
Four MFT screws size M3×6 for fastening the assembly brackets
Power cable
a. Separately ordered license certificate
Tools etc. required: Philips screwdriver (Ph No. 2) for the wall screws size 3.5×40
Torx (T10) for the MFT screws size M3×6
Screwdriver 0.40 x 2.5 mm for screw connectors on the rear side
Ethernet cable
System Bus Cabling
Power supply
PC with Microsoft Internet Explorer 8.0™ or later

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1.1 About this Document
This document is used for installation and configuration of the module, as well as for
administration and troubleshooting. Primary target groups:
• The field engineer that installs, maintains and troubleshoots the system
• The system administrator responsible for the IT management at the customer site, that
needs to get error messages, to survey and have control of the system.
• The administrator responsible for the daily administration at the customer site, that
needs to change and edit settings.
1.2 Abbreviations and Glossary
1.3 Requirements
Refer to the Data Sheet, Elise3, TD 92678GB.
1.4 FCC Compliance Statements for Class B Digital Device
This equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This
equipment generates, uses and can radiate radio frequency energy and, if not installed
and used in accordance with the instructions, may cause harmful interference to radio
communications.
However, there is no guarantee that interference will not occur in a particular installation.
If this equipment does cause harmful interference to radio or television reception, which
can be determined by turning the equipment off and on, the user is encouraged to try to
correct the interference by one or more of the following measures:
• Re-orient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
• Consult the dealer or an experienced radio or television technician for help.
Information to user
This device complies with Part 15 of the FCC Rules. Operation is subject to the following
two conditions:
this device may not cause harmful interference, and this device must accept any
interference received, including interference that may cause undesired operation.
Modifications
Changes or modifications to the equipment not expressly approved by the party
responsible for compliance could void the user’s authority to operate the equipment.
Elise Embedded Linux Server
GUI Graphical User Interface
LON Local Operating Network
SD-card a non-volatile Secure Digital memory card

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IC Requirements for Canada
This Class B digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de la Classe B conforme á la norme NMB-003 du Canada.

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2 General Information
2.1 Licenses
All Elise3 modules must have a valid software license. The license number can be found in
the application’s GUI in the Setup Wizard, on the Configuration page (the first view), on
the Advanced Configuration page in System Setup > Common > License. New licenses are
downloaded from the Ascom extranet (https://www.ascom-ws.com).
2.2 The MAC Address
The MAC address can be found on a label on the products rear side, in the application’s
GUI in the Setup Wizard, on the Configuration page (the first view) and on the Advanced
Configuration page in Troubleshoot > System Information. It is also found in the Boot
Mode GUI under System > Information.
2.3 Authentication and Administration
Administration is done via a web browser. The administration pages require a user name
and password.
IMPORTANT: The default passwords need to be changed to prevent unauthorized access
to the administration pages.
2.3.1 Authentication
GUI pages on the Elise3 module always have two different user accounts; “admin” and
“sysadmin”. Some applications also have additional accounts called “user” and “ftpuser”.
The admin account with the default password “changeme”, is used for administration and
simple troubleshooting of the module. The admin has permission to change all passwords
except the sysadmin password.
The sysadmin account with the default password “setmeup”, is used for advanced
troubleshooting. The sysadmin has access to all administration pages and has permission
to change passwords for all users.
The additional account user with the default password “password”,is found in some
Elise3 applications. This user is application dependent and the field of application is
described in the corresponding application documentation. This user does not have access
to the administration pages where passwords normally are changed, but the user can
change its own password on the following page; http://xxx.xxx.xxx.xxx/admin/public/
user_chpass.shtml. The password can also be changed by the admin and sysadmin.
The additional account ftpuser with the default password “changemetoo”, is found in
some Elise3 applications. The user is available in products with an FTP area. This user can
change its own password on the following page; http://xxx.xxx.xxx.xxx/admin/public/
ftpuser_chpass.shtml.
2.3.2 Administration
The application’s Advanced Configuration page requires the admin account. The page can
be reached directly by entering “xxx.xxx.xxx.xxx/admin” in the address bar, where
xxx.xxx.xxx.xxx is the modules IP address. For applications having a start page, it can also
be reached by pressing the “Configuration” button on the start page and then selecting
Other Settings > Advanced Configuration.

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All configurations can be set and changed on the Advanced Configuration page, such as
system setup, changing passwords, etc. This page also contains troubleshooting and
detailed configuration, for example Messaging interfaces, i.e. DECT, WLAN and Serial
interfaces etc.

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3 Description
The Elise3 front side has different status indications and is used for maintenance. The LEDs
indicates the status of the module and the management port makes it possible to have
direct connection to the module. It also has an SD card slot and two USB ports for external
temporary devices.
The rear side is used for connecting supply voltage, communication to Ascom systems,
external systems, inputs/outputs etc.
3.1 Overview of Connectors, Buttons and LEDs
Figure 1. Connections, buttons and LEDs
Figure 1.
Front side
Status LED Indicates the module status, see 3.3 LED Indications
Power LED Indicates the power status, see 3.3 LED Indications
USB port 1
USB port 2
for upgrade of the Boot software on the field.
Management Mini-USB port for device management, see 4.5 Accessing Elise3 on
page 17.
Mode button The Mode button is a momentary push button with a blue LED. Used
for placing the module into specific modes by different push patterns.
Restart button The Restart button is a hole button that requires a paper clip (or similar)
to be able to push. Used for performing controlled restart and forced
restart, see 7.2 Restarting the Elise3 on page 30.
SD card slot Currently not used (for future releases)
Connection for
supply voltage
Power LED
Status LED
Front side
Rear side
External
power supply
Mode
button
Restart
button
Ethernet
ports 900-bus
COM ports A-bus LON +V In In Out Out GND Error 12-24 V DC
1 2 1 2 Ext 1 2 1 2 Ext 1 2 + -
Management port
USB
ports
SD card slot
Error
relay
galvanically
isolated
inputs/outputs
A-bus LON-bus
Not applicable for the
Elise3 Lite version
1
2

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3.2 Label for IP Address/Host Name
To facilitate future support and access to the module, the module’s IP address or Host
name can be printed on a blank label and attached to the module as shown in the figure
below.
The blank label is found on the back side of the Getting started and Safety document:
“Elise3 – EMBEDDED LINUX SERVER INCLUDING SAFETY INSTRUCTIONS”, included in the delivery.
Figure 2. Label for the IP address or Host name
Rear side
COM1/COM2 COM ports for connection of RS232 communication, see 4.4.1 COM
Ports (RS232 Communication with External Equipment) on page 15.
Not applicable for the Elise3 Lite version.
LAN1 Modular jacks (RJ45) for connection of 10baseT or 100baseT Ethernet
TCP/IP network, see 4.4.2 Ethernet Ports on page 15.
LAN2 Currently not used (for future releases)
S900/S900 Modular jacks (RJ45) for connection of A-bus from System 900 with
modular system bus cabling, see 4.4.3 A-bus connection to System 900
on page 15.
Not applicable for the Elise3 Lite version.
A-bus Screw connector for connection of A-bus from System 900 when
modular system bus cable is not used, see 4.4.3 A-bus connection to
System 900 on page 15.
Not applicable for the Elise3 Lite version.
LON Screw connector for connection of the LON bus, see 4.4.4 LON Bus on
page 16.
Applicable for the Elise3 LON version only.
V+ Ext/GND Ext External 12 V power supply to provide galvanic isolation of the inputs
and outputs, see below.
In1/In2 and
Out1/Out2
Connects AUX Inputs and
AUX Outputs, see 4.4.6 Connection of AUX Inputs and AUX Outputs
on page 17.
Error Connector where an error relay output is available, see 4.4.5 Error
Relay Output on page 16.
12-24 V DC Connection for external backup battery/power supply, see 4.3 Supply
Voltage on page 14
100-240 V AC Connection of supply voltage, see 4.3 Supply Voltage on page 14
Figure 2.
IP address / Host name

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3.3 LED Indications
The LEDs show different colours to determine type of information and have different
flashing frequency for showing the priority.
Flashing patterns
Figure 3. LED indications
3.4 Operating Modes
Besides normal operation the Elise3 can be operated in three other modes, i.e. Boot
Mode, Demonstration Mode and Troubleshoot Mode.
3.4.1 Normal Operation
All configuration and settings for the application, maintenance such as backups, software
upgrade and troubleshooting, are performed in the application GUI and is described in the
separate application documentation. The application GUI is the web user interface for the
software application running on Elise3.
Colours
Red Fault indication
Yellow Mode indication
Blue Normal operation (OK)
Figure 3.
Fixed light indicates normal state
Slow flashing light indicates medium attention
Quick flashing light indicates high attention
Red
Red
Blue
Blue
Yellow
Yellow
Status LED
Blue
Error/fault
Starting up/ shutting down
Status OK
Demonstration mode
Feedback (1 second)
Mode LED
Blue
Blue
Boot mode
Waiting for automatic
startup (1 minute)
Warning
Troubleshoot mode and
during firmware upgrade
Mass storage mode
Yellow
Yellow
Power LED
Red
Red
Blue
* also used if the Power parameter conflicts
with the actual setup.
Closing down caused by
low voltage
Power OK
Low voltage*
Mode LED
Blue
Indicates that manual confirmation is required
Blue
Yellow
Status LED
Blue
Confirmation is done and
setting can be activated
Secured settings
Power

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3.4.2 Boot Mode
When the application running on Elise3 cannot be accessed the module can be set in Boot
Mode i.e.the web interface of the module. From this GUI it is possible to install new
software, start Troubleshoot Mode, see settings and to reset the module back to factory
default settings.1
Placing the module in Boot Mode is performed manually by the user but if the module
detects several major errors the module can place itself in Boot Mode. Refer to chapter
5 Working in Boot Mode on page 25.
3.4.3 Demonstration Mode
Demonstration Mode makes it possible to run the Elise3 for two hours with full or almost
full functionality, with or without a valid license. Exact functionality is application
dependent. For more information about the functionality during demonstration mode, see
the application documentation.
Refer to chapter 6 Run in Demonstration Mode on page 28.
3.4.4 Troubleshoot Mode
Troubleshoot Mode makes it possible to troubleshoot the system and access log files when
it is impossible to access and troubleshoot in the application running on Elise3, i.e. in
Troubleshoot Mode no application is started.
Troubleshoot Mode is started from the Boot Mode GUI, see 8.1 Troubleshooting from
Boot Mode on page 32.
1.Network settings such (IP address, Host name, etc.) will not be changed when resetting back to factory default.

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4 Installation and Configuration
The Elise3 can be mounted vertically on a wall or be placed horizontally in a 19" rack. It
must be fixed by screws or other fixtures to the wall or rack, and must not be easily
movable.
4.1 Installation Procedure
1 Mount the device, see 4.2 Mounting below.
2 Connect the supply voltage, see 4.3 Supply Voltage on page 14.
3 Access the module via the web interface, see 4.5 Accessing Elise3 on page 17.
4 Fill in all required data, see 4.6 Basic Configuration on page 21.
5 Connect to required equipment, such as Ascom systems, other external equipment,
etc. see 4.4 Connections on page 15.
4.2 Mounting
Elise3 should be placed in a dry environment with a temperature range of 0 to +40ºC.
4.2.1 Wall Mounting
Note: Four screws size 3,5×40 together with four wall plugs and four screws size M3×6,
are delivered with the product. The M3×6 screws are used for attaching the assembly
brackets to the module. Use the 3,5×40 screws for walls made of wood. For walls made of
concrete and bricks use them together with the wall plugs. For other types of walls use
suitable screws and plugs according to wall material.
IMPORTANT: When mounted on a wall, it is of great importance that the connections
are located in a vertical plane to fulfil the fire classification.
1 Fasten the supplied assembly brackets on the bottom side of the module.
2 Use the supplied screws and wall plugs (or other suitable screws and plugs
dependent on wall material) and mount the module as shown in the picture below.
Figure 4. Mounting on a wall
Figure 4.
Connectors Connectors

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4.2.2 Rack Mounting
The Elise3 can be either front mounted or reverse mounted in a 19´´ rack.
Note: Screws for fastening the assembly brackets in the rack are not included in the
delivery.
Front mounted single
• Requires the standard 19´´ rack kit
1 Fasten the big assembly bracket on the right side of the module and the small
assembly bracket on the left side as shown in the figure below.
2 Fasten the assembly brackets in the rack, see figure 5 (screws not included).
Figure 5. Front mounted single in rack
Accessories for mounting in a rack (ordered separately)
Standard 19´´ rack kit: Small left/right brackets for two front mounted Elise3
modules and one big bracket for one front mounted
Elise3 module.
Reverse 19´´ rack kit: Small left/right brackets for two reverse mounted Elise3
modules and one big bracket for one reverse mounted
Elise3 module.
Figure 5.

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Front mounted double
• Requires the standard 19´´ rack kit
1 Use the supplied assembly brackets and fasten the two modules together, both on
the rear side and on the bottom side, as shown in the two figures below.
2 Use the two small standard assembly brackets and fasten one on the right front
side and the other on the left front side.
3 Fasten the assembly brackets in the rack, see figure below (screws not included).
Figure 6. Front mounted double in rack
Rear mounted single
• Requires the reverse 19´´ rack kit
1 Fasten the big assembly bracket on the right side of the module and the small
assembly brackets on the left side, as shown in the figure below.
Figure 6.

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2 Fasten the assembly brackets in the rack, see below (screws not included)
Figure 7. Rear mounted single in rack
Rear mounted double
• Requires the reverse 19´´ rack kit
1 Use the supplied assembly brackets and mount the two modules together, both on
the rear side and on the bottom side, see figure below.
2 Use the two small reverse assembly brackets and fasten one on the right rear side
and the other on the left rear side.
3 Fasten the assembly brackets in the rack, see below (screws not included).
Figure 8. Rear mounted double in rack
Figure 7.
Figure 8.

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4.3 Supply Voltage
Elise3 can be connected to an external power supply (12-24 V DC battery or power
source) as a complement to the primary power supply (100-240 V AC). If the primary
power supply fails it switches over to the external power supply automatically, without any
negative influence on the running application.
Note: 24 hours backup requires a 12V battery with at least 4.8 Ah.
IMPORTANT: For installation on ships the 12 - 24 V DC input should be used to meet the
regulatory requirements for safety and EMC.
(To meet the regulatory requirements for EMC alone, the 12 - 24 V DC
input should be used on deck, bridge and in special power distribution
zones while 100 - 240 V AC input can be used in general power
distribution zones).
Primary power supply 100-240 V AC
• Connect supply voltage to the 100-240 V AC jack.
Figure 9. 100-240 V AC jack
External power supply 12-24 V DC
• Connect the external power supply to the 12-24 V DC screw connector.
Figure 10. 12-24 V DC connection to external power supply
4.3.1 Change Power Supply parameter
Elise3 is default configured to use the primary power supply (100-240 V AC). If connected
to an external battery, this must be configured from the Advanced Configuration page. If
the parameter setting conflicts with the actual setup, the Power LED will indicate with
slow flashing red light.
1 Select Other Settings > Advanced Configuration in the menu on the Configuration
page.
2 Select Power supply in the menu on the Advanced Configuration page.
Figure 9.
Figure 10.
100-240 VAC
12-24 VDC
+ -

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Figure 11. Power supply parameters
3 Select setting in the drop-down list (Internal PSU only, External PSU only, Internal
and external PSU or Internal PSU and external battery).
4 Click “Activate”.
4.4 Connections
4.4.1 COM Ports (RS232 Communication with External Equipment)
Requires the Elise3 Standard or LON variant. If the RS232 ports can be used or not is also
depending on the application software.
The Elise3 has two identical RS232 connectors; COM1 and COM2. How to connect
external equipment to the Elise3 is described in the documentation of the software
application.
4.4.2 Ethernet Ports
The Elise3 has two 10baseT/100baseT Ethernet modular jacks (RJ45) but only the jack
marked 1 is currently in use (the jack marked 2 is intended for future releases).
IMPORTANT: Shielded ethernet cables should be used for installation on trains to meet
the regulatory requirements for railway equipment.
4.4.3 A-bus connection to System 900
Note: Not applicable for the Elise3 Lite version.
The Elise3 module can be installed together with System 900 modules, either via modular
system bus cabling or via twisted-pair lines to 1and 2 on screw connector A-bus.
Figure 11.

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The module has two modular jacks (RJ45) marked S900 for connection of system 900 bus
cabling. If modular bus cabling is not used, connections are made with twisted pairs to 1
and 2on screw connector A-bus.
Figure 12. Modular jacks for system bus and screw connectors for twisted pairs
4.4.4 LON Bus
Note: Requires the Elise3 LON variant.
The Elise3 module can be installed together with teleCare M modules. Connections are
made with twisted pairs to 1and 2on screw connector LON.
Figure 13. LON connector
4.4.5 Error Relay Output
A relay output is used to indicate Elise3 module malfunction and can also be used to
indicate other errors. See the application documentation for more information about
functionality. Connections are made with twisted pairs to 1and 2on screw connector
Error.
Figure 14. Error relay
When the Elise3 is running the relay is closed, i.e. the error relay output is activated when
the relay releases, for example if the power is dropped. At power up or restart the relay is
Figure 12.
Figure 13.
Figure 14.
S900
A-bus
1 2
LON
1 2
or
A-bus
1 2
LON
1 2
+V In In Out Out GND
Ext 1 2 1 2 Ext
Error
1 2
Error rela
y
output

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released until the applications are working properly. If the relay is released longer the
Elise3 is malfunctioning.
4.4.6 Connection of AUX Inputs and AUX Outputs
Note: The application of the inputs and outputs are software dependent.
Figure 15. AUX inputs and outputs
Two digital inputs and two digital outputs can be connected.The outputs are of open-
collector type and the output signals are dimensioned for 100 mA at max 12 V. A pull-up
resistor should be connected to the output as shown in figure 15.
Galvanic isolation of the inputs and outputs is provided by using a separate power supply.
If galvanic isolation is not needed and Elise3 is supplied by an external 12 V power source,
the supply voltage can be taken from the 12-24 V DC screw connector by connecting +V
Ext to “+” and GND Ext to “-”.
The inputs In 1 and In 2 are active when they are connected to 12 V. When the output Out
1is active, the potential in point A in figure 15 will be close to 0 V. The same applies for a
similar connection for Out 2.
4.5 Accessing Elise3
The Elise3 can be accessed either via an IP network or directly via the management port
(mini-USB). The web browser Internet Explorer 8.0™ or later is used for accessing the
product´s web interface.
4.5.1 Access via the Network
It is recommended that this module always gets the same IP address if it communicates
with other equipment, to prevent it from losing contact with the equipment after a restart.
Inform the network administrator about the MAC address and ask to reserve a fixed IP
address via DHCP for this module. Write the IP address on the blank label, found on the
back side of the Getting Started and Safety document and attach the label on the front
side to facilitate future access. See 3.2 Label for IP Address/Host Name on page 7.
Note: If NetBIOS is enabled in the network, the address elise-XXXXXXXX can be used
when accessing the module via the network, where XXXXXXXX is the module key
number. The module key number can be found on the license certificate or on the label on
the back of the module.
Figure 15.
+V In In Out Out GND
Ext 1 2 1 2 Ext
External
equipment
Error
1 2
A
+12 V DC GND
Pull-up
resistor