Westermo MRD-350 User manual

©Westermo Teleindustri AB
MRD-350
Industrial Mobile Broadband Router
GSM / GPRS / EDGE / 3G /
HSDPA / HSUPA / HSPA
www.westermo.com
User Guide
6623-2221

26623-2221
Legal information
The contents of this document are provided “as is”. Except as required by applicable
law, no warranties of any kind, either express or implied, including, but not limited to,
the implied warranties of merchantability and fitness for a particular purpose, are made
in relation to the accuracy and reliability or contents of this document. Westermo
reserves the right to revise this document or withdraw it at any time without prior
notice.
Under no circumstances shall Westermo be responsible for any loss of data or income
or any special, incidental, and consequential or indirect damages howsoever caused.
More information about Westermo can be found at the following Internet address:
http://www.westermo.com

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Safety
Before using this unit:
Read this manual completely and gather all information on the unit. Make sure
that you understand it fully. Check that your application does not exceed the safe
operating specifications for this unit.
Hazardous voltages may occur within this unit when connected to a power supply.
Prevent access to hazardous voltages by disconnecting the unit from its power
supply.
Prevent damage to internal electronics from electrostatic discharges (ESD) by
discharging your body to a grounding point (e.g. use of wrist strap).
Before installation:
This unit should only be installed by qualified personnel.
This unit should be built-in to an apparatus cabinet, or similar, where access is
restricted to service personnel only.
The power supply wiring must be sufficiently fused, and if necessary it must be
possible to disconnect manually from the power supply. Ensure compliance to
national installation regulations.
This unit uses convection cooling. To avoid obstructing the airflow around the unit,
follow the spacing recommendations (see Installation section).
Care recommendations
Follow the care recommendations below to maintain full operation of unit and to fulfil
the warranty obligations.
This unit must not be operated with covers or lids removed.
Do not attempt to disassemble the unit. There are no user serviceable parts inside.
Do not drop, knock or shake the unit, rough handling beyond the specification may cause
damage to internal circuit boards.
Do not use harsh chemicals, cleaning solvents or strong detergents to clean the unit.
Do not paint the unit. Paint can clog the unit and prevent proper operation.
Do not expose the unit to any kind of liquids (rain, beverages, etc). The unit is not
waterproof.-Keep the unit within the specified humidity levels.
Do not use or store the unit in dusty, dirty areas, connectors as well as other mechanical
part may be damaged.
If the unit is not working properly, contact the place of purchase, nearest Westermo
distributor office or Westermo Tech support.
GSM specific safety
Please read and follow the guidelines listed below. The precautions must be observed
during all phases of the operation. Breaking these rules may be dangerous, illegal or affect
performance of the unit and/or invalidate the unit’s approval and/or warranty.
!
!

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General
Remember to follow any special regulations and warnings in force in any area and never
use the unit whenever it’s forbidden to use it. Do not use the unit when it may cause
interference or danger. A wireless device exposed to interference above specified limits
could result in deteriorated performance.
Hospitals or other Medical environment
Do not use the unit in a medical environment such as health care facilities. Follow any
regulations or rules that instruct you to not use the unit.
Pacemakers
The Health Industry Manufacturers Association recommends that a minimum separation
of six (6”) inches be maintained between cellular wireless equipment and a pacemaker
to avoid potential interference with the pacemaker. These recommendations are consist-
ent with the independent research by and recommendations of-Wireless Technology
Research.
Persons with pacemakers:
… Should ALWAYS keep the the unit and its antenna more than six inches from their
pacemaker when the unit is turned ON.
… If you have any reason to suspect that interference is taking place, turn your wireless
equipment OFF immediately.
Hearing Aids
Some digital wireless equipment may interfere with some hearing aids. In the event of
such interference, you may want to consult your service provider [or call the customer
service line to discuss alternatives.]
Other Medical Devices
If you use any other personal medical device, consult the manufacturer of your device to
determine if they are adequately shielded from external RF energy.-Your physician may be
able to assist you in obtaining this information.
Turn the wireless equipment OFF in health care facilities when any regulations posted in
these areas instruct you to do so. Hospitals or health care facilities may be using equip-
ment that could be sensitive to external RF energy.
Aircraft
Do not use the unit in an aircraft. The use of a wireless unit in an aircraft may be danger-
ous to the operation of the aircraft, disrupt the wireless network, and may be illegal.
Failure to observe these instructions may lead to suspension or denial of cellular services
to the offender, legal action, or both.
Vehicle
If the unit is incorrectly installed in a vehicular environment, the operation of the unit
could interfere with the vehicle electronics. Faulty installation and/or operation can con-
stitute a safety hazard.

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For Vehicles equipped with an airbag
An air bag inflates with great force. DO NOT place objects, including either installed or
portable wireless equipment, in the area over the air bag or in the air bag deployment
area. If in-vehicle wireless equipment is improperly installed and the air bag inflates, seri-
ous injury could result.
Blasting areas
Do not use the unit where blasting is in progress or in “blasting areas”.
Observe restrictions and follow any regulation or rules.
Explosive atmospheres
Do not use the unit in any area with a potentially explosive atmosphere.
Potentially explosive areas are often, but not always, clearly marked.
They include fuelling areas such as petrol stations, below decks on boats, fuel or chemical
transfer or storage facilities, and areas where the air contains chemicals or particles, such
as grain, dust, or metal powder.
RF energy
The unit is a low power radio transmitter and receiver. When it is ON, it receives and
also sends out radio frequency (RF) signals.
Most modern electronic equipment is shielded from RF signals. However, certain elec-
tronic equipment may not be shielded against the RF signals from the wireless unit. All
radio-transmitting devices send signals, which may cause interference in different elec-
tronic devices. To avoid interference, place the units antenna a sufficiently long distance
from other electronics.
Critical applications
Cellular units operate using radio signals and cellular networks cannot be guaranteed to
connect in all conditions. Therefore you should never rely solely on a wireless device for
essential communications, for example medical emergencies.
Backup copies
Remember to make backup copies of all important data, for example PIN/PUK codes,
contents of SIM card etc.
Antenna care
Use only the supplied or an approved replacement antenna. Unauthorized antennas,
modifications, or attachments could damage the unit and may violate current regulations.
Do not touch the antenna unnecessarily when the unit is in use. Contact with the anten-
na affects call quality and may cause the unit to operate at a higher power level than
otherwise needed.
Maintenance
No maintenance is required, as long as the unit is used as intended within the specified
conditions.

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Type Approval / Compliance
EMC
EN 55024, EN 55024 A1, EN 55024 A2,
Electromagnetic compatibility – Immunity IT equipment
EN 55022, EN 55022 A1,
Information technology equipment.
Radio disturbance characteristics.
Limits and methods of measurement
Safety IEC / EN 60950-1, IT equipment
R&TTE
Article 3.1a EN 60950-1 Safety
EN 50385 EMF exposure
Article 3.1b EN 301 489-1 ERM/EMC
EN 301 489-7 ERM/EMC GSM
EN 301 489-24 ERM/EMC 3G
Article 3.2 EN 301 908-1 ERM 3G
EN 301 908-2 ERM 3G
EN 301 511 GSM
Agency approvals and standards compliance

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Declaration of Conformity, MRD-350
Westermo Teleindustri AB
Declaration of conformity
Org.nr/
Postadress/Postal address
Tel.
Telefax
Postgiro
Bankgiro
Corp. identity number
Registered office
S-640 40 Stora Sundby 016-428000 016-428001 52 72 79-4 5671-5550 556361-2604 Eskilstuna
Sweden Int+46 16428000 Int+46 16428001
The manufacturer Westermo Teleindustri AB
SE-640 40 Stora Sundby, Sweden
Herewith declares that the product(s)
Type of product Model Art no
3G Cellular Modem Router MRD-350 3623-0201
is in conformity with the following EC directive(s).
No Short name
1999/5/EC R&TTE Radio and Telecommunications Terminal Equipment
References of standards applied for this EC declaration of conformity.
No Title Issue
EN 301 419-1 Digital cellular telecommunications system (Phase 2);
Attachment requirements for global system for mobile communications
(GSM); Part 1: Mobile stations in the GSM 900 and DCS 1800 bands;
Access
V4.1.1 (04/2000)
EN 301 511 Global system for mobile communications (GSM);
Harmonized standard for mobile stations in the GSM 900 and DCS
1800 bands covering essential requirements under Article 3(2) of the
R&TTE
Directive (1999/5/EC)
V9.0.2 (03/2003)
EN 301 489-1
EN 301 489-7
EN 301 489-24
Electromagnetic compatibility and radio spectrum matters (ERM);
Electromagnetic compatibility (EMC) standard for radio equipment and
services
Part 1: Common technical requirements
Part 7: Specific conditions for mobile and portable radio and ancillary
equipment of digital cellular radio telecommunications systems (GSM
and DCS)
Part 24: Specific conditions for IMT-2000 CDMA Direct Spread
(UTRA) for Mobile and portable (UE) radio and ancillary equipment
V1.8.1 (04/2008)
V1.3.1 (11/2005)
V1.5.1 (10/2010)
EN 60950-1 Safety of information technology equipment 2006 +A11:2009
EN 50385 Product standard to demonstrate the compliance of radio base stations
and fixed terminal stations for wireless telecommunication systems with
the basic restrictions or the reference levels related to general public
exposure to radio frequency electromagnetic fields (110 MHz – 40
GHz)
2002
EN 301 908-1
EN 301 908-2
Electromagnetic compatibility and Radio spectrum Matters (ERM);
Base Stations (BS), Repeaters and User Equipment (UE) for IMT-2000
Third-Generation cellular networks;
Part 1 & 2: Harmonized EN for IMT-2000, introduction and common
requirements, covering essential requirements of article 3.2 of the
R&TTE Directive
V4.2.1 (03/2010)
The last two digits of the year in which the CE marking was affixed: 11
_________________________________
Pierre Öberg
Technical Manager
7 June 2011

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Type tests and environmental conditions
Phenomena Test Description Test levels
ESD EN 61000-4-2 Enclosure contact ± 4 kV (crit A)
Enclosure air ± 8 kV (crit A)
RF field AM modulated IEC 61000-4-3 Enclosure 10 V/m (crit A)
(80 – 2700 MHz)
Fast transient EN 61000-4-4 Signal ports ± 1 kV (crit A)
Power ports ± 2 kV (crit A)
Surge EN 61000-4-5 Ethernet ports ± 1 kV (direct) (crit A)
Power ports ± 0.5 kV (line to earth) (crit A)
± 0.5 kV (line to line) (crit A)
RF conducted EN 61000-4-6 All ports 10 V/m, (crit A)
(0.15 – 80 MHz)
Radiated emission EN 55022 Enclosure Class B
Conducted emission EN 55022 AC power ports Class B
DC power ports Class B
Ethernet ports Class B
Temperature Operating –20 to +60ºC
(–30 to +70ºC restricted operation)
Storage & Transport –40 to +85ºC
Humidity Operating 0 to 90% relative humidity non
condensing.
Storage & Transport 0 to 90% relative humidity non
condensing.
Altitude Operating 2000 m / 70 kPa
Service life Operating 10 year
Dimension W x H x D 53 x 103 x 134 mm
Weight 0.40 kg
Degree of protection IEC 529 Enclosure IP 40
Cooling Convection
Mounting Horizontal on 35 mm DIN-rail

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Description
Remote access removes boundaries, eliminates the need for time consuming site visits
and provide a network infrastructure suitable for today's “always-on” society.
The MRD-350 industrial mobile broadband GPRS / EDGE / 3G router uses the Internet
to cost effectively inter-connect systems, allowing HMI, PLCs, sensors etc to communi-
cate with each other.
A compact design bundled with all interfaces and LEDs in the front make the unit
extremely well suited for industrial applications. With isolation between the PSU and the
Ethernet and serial ports the MRD-350 protects against issues caused by ground loops.
The dual SIM support in the device ensures that site connectivity is not dependent on a
single carrier, should something happen the unit just switches to the other SIM.
Devices connected to the Internet require countermeasures towards cyber threats. The
MRD-350 offers protection of transmissions from malicious eavesdroppers via encrypted
communication tunnels (VPN), and features a simple, yet powerful, packet inspection
firewall.
For solar powered applications energy efficiency is vital and the MRD-350 has a special
low-power mode to only be fully powered when needed. The MRD-350 with its built-in
serial port offers a simple router replacement solution with the benefit of not having to
reprogram or change any other component.
Dimensional drawing
92,3 ±0,5 10,3 ±0,5
36
±0,5
103
±0,5
53 ±0,5
(mm)

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Interface specifications
Power
Rated voltage 12 – 48 VDC
Operating voltage 10 – 60 VDC
Rated current (max) 370 mA @ 12 VDC
Start-up current (max) 1000 mA @ 12 VDC
Rated frequency DC
Consumption guidance* Voltage Mode Consumption
12 VDC GPRS Idle 165 mA
24 VDC GPRS Idle 90 mA
48 VDC GPRS Idle 55 mA
12 VDC GPRS Send 240 mA
24 VDC GPRS Send 130 mA
48 VDC GPRS Send 75 mA
12 VDC 3G Idle 225 mA
24 VDC 3G Idle 120 mA
48 VDC 3G Idle 70 mA
12 VDC 3G Send 275 mA
24 VDC 3G Send 155 mA
48 VDC 3G Send 80 mA
12 VDC 3G Send&Receive 330 mA
* For example purpose only. Hard to predict exact values since there are a lot of factors that affect the power
consumption, such as signal strength. Example measurement was carried out in-doors in a 25ºC room with
"normal" signal strength.
RS-232
Electrical specification EIA RS-232
Data rate 300 bit/s – 115.2 kbit/s
Data format 7 or 8 data bits, Odd, even or none parity, 1 or 2 stop bits
Protocol Transparent, optimised by packing algorithm
Circuit type SELV
Transmission range 15 m / 49 ft
Connection 9 pin D-sub female
Shielded cable Not required
Conductive housing Yes
Number of ports 1

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Ethernet TX
Electrical specification IEEE std 802.3. 2005 Edition
Data rate 10 Mbit/s, 100 Mbit/s, manual or auto
Duplex Full or half, manual or auto
Circuit type SELV
Transmission range 100 m / 328 ft
Isolation to All other
Connection RJ-45 auto MDI/MDIX
Shielded cable Not required, except when installed in Railway applications as signalling
and telecommunications apparatus and located close to rails.*
Conductive housing Yes
Number of ports 1
* To minimise the risk of interference, a shielded cable is recommended when the cable is located inside 3 m
boundary to the rails and connected to this port.
The cable shield should be properly connected (360º) to an earthing point within 1 m from this port.
This earthing point should have a low impedance connection to the conductive enclosure of the apparatus
cabinet, or similar, where the unit is built-in. This conductive enclosure should be connected to the earthing
system of an installation and may be directly connected to the protective earth.
Antenna
Frequency bands GSM / GPRS / EDGE 850 / 900 / 1800 / 1900 MHz
3G / HSDPA / HSUPA / HSPA 850 / 900 / 2100 MHz
Main Antenna (TX / RX) Antenna connector labeled ANT
Optional Antenna* (RX only) Antenna connector labeled AUX, receive diversity
Connection SMA female, impedance: 50 ohm
* Please note that the unit will be fully functional without the optional-antenna (AUX). However, for locations
where the signal strength is poor connecting the AUX-antenna may improve the receive signal strength.
SIM
Electrical specification 3 volts SIM supported
Number of slots 2

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1 2
Connections
Router Serial Port (DCE Female)
Position Name Direction Description
5
1
9
6
1 DCD Out Data Carrier Detect
2 RxD Out Receive Data
3 TxD In Transmit Data
4 DTR In Data Terminal Ready
5 SG – Signal Ground
6 DSR Out Data Set Ready
7 RTS IN Request to Send
8 CTS Out Clear to Send
9 RI Out Ring Indicator
Led indicators
(for details,
see next page)
Optional antenna
(for details, see page 11)
Main antenna
(for details, see page 11)
Protective
Earth
SIM card
drawers
SIM switch trigger
Factory default
reset switch
Power connector
SIM card 2 drawer
eject button
SIM card 1 drawer
eject button
Ethernet TX Connections
(RJ-45 connector) LAN1-2
Position Direction Description
1 In/Out TD+
2 In/Out TD–
3 In/Out RD+
4 – Not Connected
5 – Not Connected
6 In/Out RD–
7 – Not Connected
8 – Not Connected

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LED Indicators
LED Status Description
STS
Status
RED No wireless network has been detected
RED FLASH A wireless network has been detected
GREEN No valid SIM installed
SIG
Signal strength
RED RF circuitry initialising or network
registration fault
GREEN / RED Network connection fault
GREEN 1 BLINK
Signal strength indication
1 Very poor
3 Normal
6 Very good
GREEN 2 BLINKS
GREEN 3 BLINKS
GREEN 4 BLINKS
GREEN 5 BLINKS
GREEN 6 BLINKS
PWR
Power
OFF Unit has no power
GREEN All OK
NET
Network indicator
OFF Not ready
GREEN FLASH Searching for network
GREEN Locked to network
Power Indicator
The power indicator will light green when power is applied. If the indicator does not light
when power is applied then check the power supply connections.
Network Indicator
The network indicator reports the status of the connection to the network. When pow-
ered up the indicator will be off, the indicator will then flash green whilst the unit search-
es for a network, once connected to the network the indicator will light green.
Status Indicator
The status indicator reports the health of the unit. In normal operation the indicator will
be green, if a fault is detected either at boot-up or during normal operation the indicator
will light red. When the unit is first switched on or is reset the indicator will first light
red, then flash red in sequence with the Signal Strength Indicator, this is normal behaviour
during boot-up and does not indicate a fault.

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Signal Strength Indicator
The Signal Strength Indicator reports the level of the received RF signal as well as any
network connection faults that occur. The signal strength is indicated by the number of
green flashes of the indicator within an indicator period. Each indicator green flash will
be followed by a short off time, an extended off time indicates the end of the indicator
period. So an indicator period starts with a green flash followed by up to 5 additional
flashes, then an extended off time, the cycle will then repeat. The maximum number of
flashes in an indicator period is 6.
The indicator may be red during the extended off time following the green flashes, this
indicates a network connection fault. The indicator will flash red if a SIM card is not
present and will be solid red if the RF circuitry is restarting, network registration has
failed or the RF signal level is too low for a connection.
When the unit is first switched on, or is reset the indicator will first light red, then flash
red in sequence with the Status Indicator, this is normal behaviour during boot-up and
does not indicate a fault.
Factory Default Reset Switch
The reset switch is used to restore the configuration of the MRD-350 to factory default
settings. The switch is accessed through a small hole on the rear of the unit adjacent to
the power connector.
To reset the configuration:
• Power down the unit.
• Using a suitable tool depress the reset switch.
• Power up the unit ensuring the switch remains depressed for approximately 5 seconds
after power is applied. The STS and SIG LED will flash twice to indicate a reset.
• The router will now re-boot as normal with the factory default settings.
Note: Using the Factory Default Reset Switch will erase all existing configuration
settings and restore the factory default settings. This includes the network
connection profile settings APN, user name and password.
Factory default reset switch
1 2

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Protocols and Functionality
Ethernet Technologies IEEE 802.3 for 10BaseT
IEEE 802.3u for 100BaseTX
Cellular Technologies Circuit Switched Data mode (CSD)
GSM
GPRS Multi-slot class 12, mobile station class B, PBCCH support,
coding schemes CS 1-4
EDGE Multi-slot class 12 (max 236.8 kbit/s), mobile station class B,
modulation and coding scheme MCS 1-9
3G (WCDMA/UMTSt) 384 kbit/s downlink / uplink
HSDPA up to 14.4 Mbit/s downlink
HSUPA up to 5.7 Mbit/s uplink
Serial Port Technologies RS-232
Serial Over IP (Serial Extender and Virtual Serial Port)
Router emulation
AT command interpreter
MODBUS
DNP3
Layer-2 QoS IEEE 802.1p Class of Service
IP Routing,
Firewall,
VPN
and Cyber Security
Static IP routing
Dynamic IP routing
• RIPv1/v2
VRRP
GRE
Stateful inspection Firewall / ACL, NAT, Port Forwarding
3 x IPsec VPN, PSK & X.509
1 x L2TP client
1 x PPTP client
1 x OpenVPN / SSL VPN client
RADIUS
PPP Dial in/Dial out
Manageability Management tools
• Web interface (HTTP and HTTPS)
• Command Line Interface (CLI) via SSHv2 and TELNET
• SNMPv1/v2c/v3
• SMS Control
Flexible alarm/event handling system
Syslog (log files and remote syslog server)
SNTP (NTP client)
DHCP client
DHCP server
DDNS (Dynamic DNS update client)
For more information on the features and functionality, please refer to the Reference Guide on the
product website.

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Getting started
Installing the SIM Card
The SIM card is accessed from the rear of the unit.
To eject the SIM card drawer press the SIM card …
eject button using a suitable tool and remove
the drawer, refer to figure for the location of
the SIM card eject button.
Insert the SIM card into the SIM card drawer …
with the contacts facing up, let chambered
corners align.
Slid the drawer back into the unit ensuring that …
it locks into place.
Note: Before removing or inserting the SIM card,
ensure that the power has been turned off
and the power connector has been removed from the MRD-350.
Connecting the Antenna
The unit has two antenna connectors (SMA). Please ensure that the connecting nut is
done up tightly in order to make a good connection.
Connect the Power Supply
The MRD-350 requires a DC power source in the voltage range of 10 to 60 VDC.
The unit is designed to self protect from permanent damage if the voltage exceeds
60 VDC or if reverse polarity is applied. The router may need to be returned for service
if this occurs. The router can also be damaged if there is any potential difference between
the chassis-ground, RS-232 signal ground, power (–) input, or antenna shield. Before con-
necting any wiring, ensure all components are earthed to a common ground point. An
external isolator will be required if a positive earth power supply is used.
Ethernet
The Ethernet ports are on the front of the unit and are marked LAN 1 and LAN 2, each
port has a LED indicating the connection speed and a LED indicating activity as shown
in figure below. Both ports are capable of auto-negotiation, meaning cross-over cables
are not required. The Ethernet ports are switched, allowing more than one
Ethernet device to be connected to the unit at one time.
Activity LED
Connection speed LED
SIM card drawer
eject button

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Configuration
Accessing and Using the Web Interface
All configuration of the MRD-350 is performed via the web interface. In order to view
the web pages a computer with a fixed IP address, on the same sub-net as the MRD-350,
will need to be connected to one of the LAN ports.
The default IP settings of the MRD-350 are:
• IP Address: 192.168.2.200
• Netmask: 255.255.255.0
The recommended IP settings for the PC used to configure the MRD-350 Router:
• IP Address: 192.168.2.100
• Netmask: 255.255.255.0
• Default Gateway: 192.168.2.200
• Primary DNS: 192.168.2.200
Note: Although it is possible to connect the MRD-350 directly to a Local Area Network
(LAN) it is recommend that the network configuration as described in this sec-
tion is performed prior to doing so. The DHCP server of the unit is by default
disabled.

18 6623-2221
Windows PC Network Settings
The following describes how to configure the network settings of a Windows XP PC so
that it can access the MRD-350.
Note: This procedure will change the network settings of the Windows PC, if the PC is
connected to a network the connection should be removed before performing
the changes. To restore the network settings of the PC record the current settings
at Step6 in the following procedure, then when the MRD-350 has been configured
following the procedure again and use the recorded values at Step 6.
1. Open the Control Panel by selecting Start > Control Panel.
2. Double click the Network Connections icon.
3. Double click the Network icon.
4. The Local Area Connection Status dialog box will be displayed, click the Properties but-
ton.
5. The Local Area Connection Properties dialog box, as shown in Figure 1, will be
displayed
Click on Internet Protocol (TCP/IP) to highlight it and then click the Properties
button.
Figure 1

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6. The Internet Protocol (TCP/IP)Properties dialog box, change the settings to match
those shown in Figure 2, and then click ”OK.
Figure 2
Note: If a web browser was open prior to making the network changes, then it will
need to closed and re-started before attempting to connect to the MRD-350.
Accessing the MRD-350
• Open a web browser on the PC and browse to http://192.168.2.200
(the default MRD-350, IP address) .
• A login box will popup. If the box fails to display, re-check the cable connections
to the unit and the IP address settings of the PC.
Enter the following login details:
• User Name: admin
• Password: westermo

20 6623-2221
• The Status summary page will be displayed, it will be similar to Figure 3.
Figure 3
Note: If the unit is not yet configured it is likely that the Network Status and
Connection Status will indicate a fault condition.
Basic Configuration
The three sections below detail the steps needed to configure the MRD-350 for basic
packet mode functionality. For details on how to configure the unit for Circuit Switched
mode and for more advanced configuration refer to the Advanced Configuration section
of the Reference Guide.
Configure the 3G Wireless interface
To access the configuration page for the 3G Wireless interface, click on Wireless.
The Basic Wireless configuration page will be displayed as shown in Figure 4.
Figure 4