ABLELink EW5302 User manual

ABLELink®
EW5302 Ethernet to Wireless
Client Adaptor
User’s Manual
Version 1.0
Updated on November 13, 2008
TEL: [phone]
FAX: [phone]
http://www.atop.com.tw

User manual Version 1.0
EW5302 Wireless Serial Server
Important Announcement
The information contained in this document is the property of Atop Technologies, Inc. and is supplied for
the sole purpose of operation and maintenance of products of Atop Technologies, Inc. No part of this
publication is to be used for any other purposes, and it is not to be reproduced, copied, disclosed,
transmitted, stored in a retrieval system, or translated into any human or computer language, in any form,
by any means, in whole or in part, without the prior explicit written consent of Atop Technologies, Inc.
Published by
Atop Technologies, Inc.
2F, No. 146, Sec. 1, Tung-Hsing Rd.
Jubei, Hsinchu 30261
Taiwan, R.O.C.
Tel: [phone]
Fax: [phone]
http://www.atop.com.tw
Copyright © 2007 Atop Technologies, Inc. All rights reserved.
All other product names referenced herein are registered trademarks of their respective companies.
Copyright © 2007 Atop Technologies, Inc.
All rights reserved
I

User manual Version 1.0
EW5302 Wireless Serial Server
Copyright © 2007 Atop Technologies, Inc.
FCC WARNING
Class A for this product
This product has been tested and found to comply with the limits for a Class A 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 of the following measures:
 Reorient 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/TV technician for help.
This product complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.
FCC Caution: Any changes or modifications not expressly approved by the party responsible for
compliance could void the user's authority to operate this equipment.
IMPORTANT NOTE:
FCC Radiation Exposure Statement:
This product complies with FCC radiation exposure limits set forth for an uncontrolled environment. This
model should be installed and operated with minimum distance 20cm between the radiator & your body.
This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter.
IEEE 802.11b/g operation of this product in the U.S.A. is firmware-limited to channels 1 through 11.
UL Notice for Power supplier
All the series of EW5302 products are intended to be supplied by a Listed Power Unit marked with “LPS”,
“Limited Power Source” or “Class 2” and output rate 9~48VDC, 1.0A minimum. Or, use the recommended
power supply in “Optional Accessories”.
All rights reserved. Designed in Taiwan
- II -

User manual Version 1.0
EW5302 Wireless Serial Server
Copyright © 2007 Atop Technologies, Inc.
Contents
1. INTRODUCTION................................................................................................................................................1
1.1. OVERVIEW ......................................................................................................................................................1
1.2. FEATURES........................................................................................................................................................1
2. GETTING STARTED..........................................................................................................................................2
2.1. PACKAGING INCLUDE......................................................................................................................................2
2.2. ORDERING INFORMATION ................................................................................................................................2
2.3. INTERFACES ....................................................................................................................................................2
2.4. INSTALLATION PROCEDURES ...........................................................................................................................3
3. SOFTWARE SETUP............................................................................................................................................4
3.1. DEFAULT SETTINGS.........................................................................................................................................4
3.2. IPASSIGNMENT ..............................................................................................................................................5
3.2.1. Configure IP by SerialManager Utility......................................................................................5
3.2.2. Configure IP address using ARP commands...........................................................................5
3.2.3. Configure IP Using Web Interface...........................................................................................6
3.2.4. Automatic IP address assignment using DHCP......................................................................6
3.3. TCP/IP PORT NUMBER....................................................................................................................................6
4. APPLICATION CONNECTIVITY....................................................................................................................7
4.1. TCP & UDP PROTOCOLS................................................................................................................................7
4.1.1. Transmission Control Protocol (TCP)......................................................................................7
4.1.2. User Datagram Protocol (UDP)...............................................................................................7
4.2. CONNECTIVITY TOPOLOGY .............................................................................................................................7
4.3. ETHERNET TO WLAN BRIDGE FUNCTION.......................................................................................................8
4.4. VIRTUAL COM MODE.....................................................................................................................................8
4.4.1. TCP Server in Virtual COM Mode............................................................................................8
4.4.2. TCP Client in Virtual COM Mode.............................................................................................8
4.5. TUNNELING MODE..........................................................................................................................................9
4.6. UDP MODE....................................................................................................................................................11
5. CONFIGURE EW5302 BYWEB INTERFACE.............................................................................................12
5.1. LOGIN TO SYSTEM.........................................................................................................................................12
5.2. GENERAL INFORMATION ...............................................................................................................................12
5.2.1. Device Information.................................................................................................................14
5.2.2. Wireless Client Adaptor Information......................................................................................14
5.2.3. Serial Information...................................................................................................................14
5.3. NETWORK CONFIGURATIONS ........................................................................................................................15
5.3.1. Wireless Client Adaptor Settings...........................................................................................16
5.3.2. DNS Settings.........................................................................................................................16
5.3.3. SNMP Settings.......................................................................................................................16
5.4. WIRELESS CONFIGURATION ..........................................................................................................................17
5.4.1. Wireless Settings...................................................................................................................18
All rights reserved. Designed in Taiwan
- III -

User manual Version 1.0
EW5302 Wireless Serial Server
Copyright © 2007 Atop Technologies, Inc.
5.4.2. Sample Wireless Application Cases......................................................................................18
5.5. COM PORT CONFIGURATION ........................................................................................................................20
5.5.1. TCP Server Mode..................................................................................................................20
5.5.2. TCP Client Mode....................................................................................................................20
5.5.3. UDP Mode .............................................................................................................................22
5.5.4. Serial Settings........................................................................................................................22
5.5.5. Packet delimiter.....................................................................................................................23
5.6. CONFIGURE SYSTEM .....................................................................................................................................23
5.6.1. Configure Time by NTP Service ............................................................................................23
5.6.2. WLAN Region........................................................................................................................24
5.6.3. Security (Password Change).................................................................................................24
5.6.4. Restoring Factory Default Configurations..............................................................................25
5.6.5. Restart System......................................................................................................................25
APPENDIX A. USINGVIRTUAL COM............................................................................................................26
A.1. PRE-INSTALLATION REQUIREMENTS..............................................................................................................26
A.2. LIMITATION AND INSTALLATION....................................................................................................................26
A.3. VIRTUAL COM COMMUNICATION.................................................................................................................27
APPENDIX B. CONFIGURATION UTILITY..................................................................................................30
B.1. SERIALMANAGER UTILITY INTRODUCTION ...................................................................................................30
B.2. INTERFACE ....................................................................................................................................................30
B.3. FUNCTIONS ...................................................................................................................................................30
B.3.1. Device Search .......................................................................................................................30
B.3.2. Firmware................................................................................................................................33
B.3.3. Configuration .........................................................................................................................35
B.3.4. Security..................................................................................................................................41
B.3.5. View .......................................................................................................................................43
B.3.6. About......................................................................................................................................43
APPENDIX C. UPGRADING SYSTEM SOFTWARE.....................................................................................44
C.1. SYSTEM UPGRADING PROCEDURES...............................................................................................................44
C.2. CRITICAL ISSUES IN UPGRADING PROCESS....................................................................................................44
APPENDIX D. SPECIFICATIONS ....................................................................................................................45
D.1. HARDWARE SPECIFICATIONS .........................................................................................................................45
D.2. SOFTWARE SPECIFICATIONS ..........................................................................................................................46
D.3. PIN ASSIGNMENTS.........................................................................................................................................46
D.3.1. DB9 male connector pin assignments for Serial port............................................................46
D.3.2. Terminal block pin assignments for Serial and Power...........................................................47
D.4. BEEP & LED STATUS ....................................................................................................................................47
D.4.1. Startup status.........................................................................................................................47
D.4.2. Wireless Signal Strength status.............................................................................................47
D.4.3. WLAN LED Message.............................................................................................................48
D.4.4. COM Port LED Message.......................................................................................................48
D.4.5. RUN LED Message...............................................................................................................48
All rights reserved. Designed in Taiwan
- IV -

User manual Version 1.0
EW5302 Wireless Serial Server
Copyright © 2006 Atop Technologies, Inc.
All rights reserved
1
1. Introduction
1.1. Overview
EW5302 Wireless Client Adaptor is a bridge between wireless LAN to Ethernet and RS-232/RS-485
communications. It allows almost any Ethernet and serial devices to be connected to a new or existing
wireless network. The information transmitted by Wireless Client Adaptor is transparent to both host
computers (IP network over wireless LAN) and devices (Ethernet/RS-232/RS-485). Data from the wireless
LAN is transmitted to the designated Ethernet/RS-232/RS-485 port and data from Ethernet/RS-232/RS-485
port is transmitted to the Wireless (TCP/IP) transparently.
In the computer integration manufacturing or industrial automation area, Wireless Client Adaptor is used for
field devices to direct connect to network.
Many control devices provide the ability to communicate with hosts through Ethernet/RS-232/RS-485
however RS-232/RS-485 serial communication has its limitations. For instance, it is hard to transfer data
through Wireless or long distance. With EW5302, it is possible to communicate with a remote device in the
Intranet environment or even in the Internet and thus, increases the communication distance dramatically.
Flexible configuration options enable this unit to be setup remotely over IP network by Web browser, or
Window utility. Packed in a rugged DIN Rail mountable case and 9~48V DC power input range, EW5302 is
ideal for almost any industrial and manufacturing automation.
1.2. Features
 Transparent between Ethernet to Wireless networking
 Plus Dual serial port for more connectivity.
 Metal housing and IP50 standard with DIN-Rail mounting.
 15KV ESD protection for serial ports
 IEEE 802.11g 54Mbps wireless network connectivity
 Support UDP, TCP server and client protocols for Virtual COM mode and pair connection
 Selectable RS-232/RS-485/RS-422 serial mode by software
 Configurable via built-in web server and Windows-based utilities
 Standard 2.4GHz High-gain antenna
 Upgradeable firmware via network

User manual Version 1.0
EW5302 Wireless Serial Server
Copyright © 2007 Atop Technologies, Inc.
All rights reserved. Designed in Taiwan
- 2 -
2. Getting Started
2.1. Packaging Include
 Atop Wireless Client Adaptor x 1
 5 pins Terminal Block for Serial Connector (TB model only) x 2
 3 pins Terminal Block for Power Connector (TB model only) x 1
 4 dBi Antenna x 1
 Wall mount kits x 2
 Atop Wireless Client Adaptor quick start guide x 1
 Product CD containing configuration utility x 1
NOTE: Notify your sales representative if any of the above items is missing or damaged.
2.2. Ordering information
The EW5302 can be ordered using the following codes.
EW5302-WgN1(DB) Wireless Client Adaptor plus 2-ports with D-Sub 9pin serial connector
EW5302-WgN1(TB) Wireless Client Adaptor plus 2-ports with Terminal Block serial connector
EW5302-WgN1Sis(TB) Wireless Client Adaptor plus 2-ports RS-422/485 photo Isolated with
terminal block serial Connector
Optional Accessories and their ordering codes
US315-12 (US)
USE315-12 (EU)
1A25F(US)
1A25F(EU)
AC100~240V US plug / DC12V 3 pin Terminal block for TB model
AC100~240V EU plug / DC12V, 3 pin Terminal block for TB model
AC100~240V US plug / DC12V DC-jack for DB model
AC100~240V EU plug / DC12V DC-jack for DB model
HG055 5.5dBi antenna, SMA (R) Female connector with 180cm cable
2.3. Interfaces
The interfaces of EW5302 on the front panel are shown in Fig. 1. There are two models, DB model and
TB model as shown in the figure.
10/100M
Ethernet port
Antenna Connector
Wireless Status
LEDs
System/WLAN
status LED
Reset
button
Serial Status
LED
D-sub 9-pin
Connector
D-sub 9-pin
Connector
DC-Jack
for Power
DB Model (9 pin D-Sub Connectors) TB Model (5pin Terminal Block Connectors)
Fig. 1. EW5302 Front Panel and Interfaces

User manual Version 1.0
EW5302 Wireless Serial Server
Copyright © 2007 Atop Technologies, Inc.
All rights reserved. Designed in Taiwan
- 3 -
2.4. Installation Procedures
 Prepare necessary cables, DC power adaptor and RS-232/RS-485 connector.
 Place EW5302 under the access point signal coverage area, or connect EW5302 to Ethernet
cable with RJ45 connector.
 Connect EW5302 serial port to a Serial device. Please make sure the connector and wiring of
RS-232 or RS-485 is correct.
 Plug in EW5302 to DC-9-48V power source (with DC-jack or 3-pin terminal bock connector),
buzzer will beep and the RUN LED will blink if EW5302 functions normally. For LED Status see
Appendix D.4
Use SerialManager configuration utility on the Product CD to check the status of EW5302. If it starts up
successfully, users shall find the IP and MAC addresses of EW5302. Users can also change IP address,
gateway IP address and subnet mask networking parameters of EW5302 according to user networking
configurations.

User manual Version 1.0
EW5302 Wireless Serial Server
Copyright © 2007 Atop Technologies, Inc.
All rights reserved. Designed in Taiwan
- 4 -
3. Software Setup
Now the EW5302 hardware is installed and the power is on, network IP configuration will be set in this
section.
3.1. Default Settings
The EW5302 has two IP addresses one for Ethernet interface and another one for wireless network
interface. These default settings are shown from under information
Default IP addresses
Device IP Subnet mask Gateway IP
10.0.0.50.100 255.255.0.0 10.0.0.254
The other default settings of EW5302 are shown in the following table
Property Default Value
Wireless Client Adaptor IP
IP Address 10.0.50.100
Gateway 10.0.0.254
Subnet Mask 255.255.0.0
Security
User Name Admin
Password Null (Leave it blank)
Serial
COM 9600/None/ 8/1,No flow control, packet delimiter disabled
Link Mode TCP Server, Listen port 4660/4661,No Filter, Virtual COM disabled
SNMP
SysName of SNMP Name
SysLocation of SNMP Location
SysContact of SNMP Contact
Table 1. Factory default settings of the EW5302
NOTE: Press push Reset button for 5 seconds and then release to restart EW5302 with the factory
default settings.
Warning: Please avoid setting LAN and WLAN IP addresses in the same subnet. This may create
unexpected networking problems.

User manual Version 1.0
EW5302 Wireless Serial Server
Copyright © 2007 Atop Technologies, Inc.
All rights reserved. Designed in Taiwan
- 5 -
3.2. IP Assignment
3.2.1. Configure IP by SerialManager Utility
Use SerialManager configuration utility that comes with Product CD-ROM or Diskette to configure the
network parameters. For more details, please refer to Appendix B1.
Find a new device and IP assignment
 Use SerialManager Utility to find the new device IP address or to get the device’s current IP
address as shown in Fig. 2.
 If needed, use SerialManager Utility to re-assign a new IP address, Network Mask and Gateway
address to the new device.
 Users can also configure User ID, Password and Host Name using SerialManager Utility.
Fig. 2. IP Settings using SerialManager Utility software
Note: All settings will NOT be changed if User ID or Password was incorrect.
If there is more than one device using the same IP address in the same subnet, users need to correct the
mapping between MAC address and IP address using ARP commands as explained in the next section.
3.2.2. Configure IP address using ARP commands
ARP (Address Resolution Protocol) commands can be used to assign a static IP address on EW5302 using
its hardware MAC (Media Access Control) address. The MAC address "0060E9-xxxxxx" is printed on the
rear side of EW5302. The following procedures show how to use ARP commands on MS-DOS Command
Prompt Window.
Example: Set the IP address 10.0.50.101 to the MAC address 00-60-E9-00-79-F8. Using
C:\> arp –s 10.0.50.101 00-60-E9-00-79-F8
arp –a command shows the current mapping IP and MAC addresses.
arp –s “IP address” “MAC address” maps the IP address to a specific MAC address.
Note: ARP commands can only be used to set a static IP address of EW5302.

User manual Version 1.0
EW5302 Wireless Serial Server
Copyright © 2007 Atop Technologies, Inc.
All rights reserved. Designed in Taiwan
- 6 -
Fig. 3. Mapping IP address to MAC address using ARP Command
3.2.3. Configure IP Using Web Interface
Use common web browsers, e.g. Microsoft Internet Explorer or Mozilla Firefox, to configure the network
parameters of EW5302.
 Open a Web browser, type in the IP address (default IP: 10.0.50.100) of the EW5302 to be
configured. The default user name is admin and the default password is null (leave it blank).
 From the Web Network links page, please configure IP address, subnet mask, and gateway
address, and then click “Save Configuration” to save all settings.
 Click Restart button to reboot the device to make the changes effective.
Please refer to contents of Web Configuration section for more details of the settings.
3.2.4. Automatic IP address assignment using DHCP
DHCP server can automatically supply an IP address, gateway address, and subnet mask to EW5302
device if its DCHP client function is set. By default, the DHCP client function is disabled, users can activate
the DHCP function by following these steps.
 Execute SerialManager Utility.
 Click on the IP address of EW5302 (This can be the default IP address if it was never set before).
 Click Config to pop-up the static IP Dialog Window.
 Check on Auto IP.
 Click Config Now. (The EW5302 will restart and obtain an IP from DHCP server automatically)
Note: You need to have a DHCP Server running in your subnet to automatically supply an IP
address. Please consult your network administrator if you are not sure.
3.3. TCP/IP Port Number
Default TCP Port numbers of EW5302 are 4660 (1st port) and 4661 (2nd Port) that are associated with the
Serial port COM1 and COM2, respectively. After the application program connects to the TCP port 4660
(or 4661) on the EW5302, data of user’s application program are transparently transmitted to Serial port
COM1 (or COM2) of EW5302.

User manual Version 1.0
EW5302 Wireless Serial Server
Copyright © 2007 Atop Technologies, Inc.
All rights reserved. Designed in Taiwan
- 7 -
4. Application Connectivity
The EW5302 is designed to transmit data between one or more Ethernet/serial devices to/from one or more
TCP/IP devices through wireless Ethernet interface. EW5302 can enhance the accessibility of the serial
device through the ubiquitous TCP/IP based Ethernet as well as Wireless Ethernet. The connection
distance limit is overcome by EW5302. Examples of these devices are PLC controllers, card readers,
display signs, security controls, CNC controller, etc.
4.1. TCP & UDP Protocols
EW5302 can operate in two most common transportation protocols, TCP and UDP.
4.1.1. Transmission Control Protocol (TCP)
TCP provides a connection and a byte oriented data stream with control parameters such as flow control,
multiple ports option, and order delivery notification. Once the connection is established, data can be
transmitted in both directions. TCP guarantees data is transmitted from one node to the other node(s) in
orderly. The protocol also distinguishes the transmitted data for different applications (such as a Web server
or an Email server) on the same computer.
For redundant or dual-network connectivity purposes, EW5302 offers two TCP operation modes so users
may choose for their specific application, TCP Server Mode and TCP Client Mode.
4.1.2. User Datagram Protocol (UDP)
UDP is a faster datagram delivery protocol. User can configure EW5302 to work in the UDP mode. UDP is
connectionless protocol and can transmit multicast data to/from a serial device to one/multiple host
computer. Because UDP is the connectionless protocol, UDP does not guarantee the reliability and orderly
data streams like TCP protocol. Datagram may arrive out of order or lose without notice. But the advantage
of UDP is the speed. UDP is faster and hence more attractive in time-sensitive applications.
4.2. Connectivity Topology
EW5302 is also equipped with Tunneling and Virtual COM operation modes. It is designed to transmit data
to/from multiple serial devices and from/to multiple TCP/IP devices on Ethernet, so it can enhance the
accessibility of the serial devices immensely. The example of EW5302 connection topology is shown in Fig.
4. Note: Please do not connect more then one device on LAN port.
Fig. 4. Typical Topology of EW5302 Connection

User manual Version 1.0
EW5302 Wireless Serial Server
Copyright © 2007 Atop Technologies, Inc.
All rights reserved. Designed in Taiwan
- 8 -
4.3. Ethernet to WLAN Bridge Function
The EW5302 can also work as a network bridge between Ethernet to WLAN. Packets from WLAN to
Ethernet or from Ethernet to WLAN are transferred transparently. This will let the Ethernet devices can be
accessed from wireless networks over the wireless interface.
4.4. Virtual COM Mode
The Virtual COM software emulates a serial port with Internet or LAN topology. In the Virtual COM Mode,
COM port data is encapsulated with Ethernet data format. By creating a virtual COM port on a PC, the
Virtual COM driver redirects communications from the virtual COM port to the destination IP address (and
the designated port number) by encapsulating COM data into IP packet format. Fig. 5 illustrates a Virtual
COM connection diagram.
Fig. 5. TCP Connection in Virtual COM Mode
4.4.1. TCP Server in Virtual COM Mode
EW5302 can be configured in the TCP server mode (a computer or PC acts as a client) with a unique IP
and Port number, and EW5302 waits passively for the PC to establish a connection. After the connection is
established, PC can communicate to serial devices through EW5302.
Configure EW5302 to be TCP server
Using one of the two configuration methods, by Web-based and by Windows-based SerialManager utility,
Users can configure EW5302 to be a TCP Server as follows.
 Disabled the IP filter (default)
 Set the port number (default port is 4660 for COM1, 4661 for COM2).
 If IP filter is enabled, only the assigned source IP is allowed to be connected to EW5302.
4.4.2. TCP Client in Virtual COM Mode
EW5302 can also be configured in TCP Client mode (PC as a server) to establish a TCP connection to an
application server on PC, or the Remote Control Host. Once the connection is established, PC or Remote
Control Host can exchange data with several serial devices at the same time through EW5302 as shown in
Fig. 6.

User manual Version 1.0
EW5302 Wireless Serial Server
Copyright © 2007 Atop Technologies, Inc.
All rights reserved. Designed in Taiwan
- 9 -
Configuring EW5302 to be TCP client
User can configure EW5302 to be as a TCP client, for example, from Fig. 7, PC, as a server, has IP
address 10.0.0.100 and listening on port 1000. Each EW5302, connected with serial device, configured as
TCP client mode with destination IP address 10.0.0.100 and the destination port 1000, and the IP filter is
disabled (by default).
Fig. 6. TCP Server in Virtual COM Mode
Fig. 7. TCP Client in Virtual COM Mode
4.5. Tunneling Mode
Tunneling Mode is used for multiple serial devices to “talk” among one another through EW5302’s wireless
LAN or wired Ethernet interface. This mode is particularly useful when two or more serial devices are far

User manual Version 1.0
EW5302 Wireless Serial Server
Copyright © 2007 Atop Technologies, Inc.
All rights reserved. Designed in Taiwan
- 10 -
away. This mode can be used to extend the normal RS-232 serial communication distance of 15 m to 100 m
or longer as shown in Fig. 8.
One EW5302 can be configured to be the TCP Server Mode with serial device connected and also another
EW5302 is configured as TCP client with serial device connected. After the connection is established, both
serial devices can exchange data to each other transparently. For example, users can implement EW5302
tunneling mode for Master /Slave mode PLCs or between other serial devices.
Fig. 8. TCP Link in Tunneling mode
Configuring EW5302 to Tunneling Mode
Using one of two configuration methods (Web-based or Windows-based SerialManager utility), users can
configure EW5302 to TCP Server mode with a desired IP address and port, and with other EW5302 is
configured as TCP Clients mode with Server IP and port as destination IP and port respectively as shown
as an example in Fig. 9.
Note: TCP client has to assign the destination IP and the destination port corresponding to TCP
server’s IP and listening port (example: TCP 4660 port).
Fig. 9. TCP Tunneling Mode

User manual Version 1.0
EW5302 Wireless Serial Server
Copyright © 2007 Atop Technologies, Inc.
All rights reserved. Designed in Taiwan
- 11 -
4.6. UDP mode
In UDP mode, users may exchange Multicast data from one EW5302 with multiple EW5302 devices as
shown in Fig. 10.
Fig. 10. UDP Link in Tunneling mode
Configure EW5302 in UDP Mode
Use one of the two configuration methods (Web-based or Windows-based SerialManager utility). Users
can configure EW5302 to UDP mode. In UDP mode, EW5302 can be configured to communicate to more
than one node (Multicasting). Note that the Multicast IP address is limited by the Class of IP address and
subnet mask. As an example, for a network of Class C of subnet 192.168.1.X and a subnet mask of
255.255.255.0, the maximum Multicast IP address to be configured is four destinations IP’s.
Fig. 11. Multi-UDP Link in Tunneling Mode

User manual Version 1.0
EW5302 Wireless Serial Server
Copyright © 2007 Atop Technologies, Inc.
All rights reserved. Designed in Taiwan
- 12 -
5. Configure EW5302 by Web Interface
Users need to assign an IP address to EW5302 before working on the web configuration operations. Please
refer to Section 3.2 for IP address assignment.
5.1. Login to System
Open one of the web browsers, ex. Microsoft IE or Firefox etc. Enter the IP address of EW5302 on the URL.
Example: http://10.0.50.100 or http://your-device-IP-address.
The following authentication screen shall appear. Enter User Name and Password then click on “OK”. The
default user name is “admin” and password is null (leave it blank).
Fig. 12. Authentication request for system security
5.2. General Information
Once the login is successful, an Overview window gives the general information of EW5302, included
Network, and Serial information as shown in Fig. 13.

User manual Version 1.0
EW5302 Wireless Serial Server
Copyright © 2007 Atop Technologies, Inc.
All rights reserved. Designed in Taiwan
- 13 -
Fig. 13. Overview of system information on a Web Interface

User manual Version 1.0
EW5302 Wireless Serial Server
Copyright © 2007 Atop Technologies, Inc.
All rights reserved. Designed in Taiwan
- 14 -
5.2.1. Device Information
EW5302’s system information includes Model Name, Device Name, Kernel Version, and AP version. The
information is read only and is attributed from setting page or system status.
Fig. 14. Device Information from Overview web page
5.2.2. Wireless Client Adaptor Information
Wireless Client Adaptor Information fields display both LAN & Wireless LAN (WLAN) information. The
information provided are LAN MAC address, Region for Regulation, LAN IP address, WLAN MAC address,
WLAN IP address, and Link status.
Fig. 15. Wireless Client Adaptor Information from Overview web page
5.2.3. Serial Information
EW5302 COM1 (COM2) information includes UART mode, link mode, baud rate, parity, data bits, stop bits,
flow control and link status. The COM1 (COM2) information is read only and is attributed from Serial
settings of COM1 or COM2 Port of EW5302.
Fig. 16. Serial Information from Overview web page

User manual Version 1.0
EW5302 Wireless Serial Server
Copyright © 2007 Atop Technologies, Inc.
All rights reserved. Designed in Taiwan
- 15 -
5.3. Network Configurations
There are three items allowed to change on Networking page, included Wireless Client Adaptor Settings,
DNS Setting and SNMP Settings.
Fig. 17. Network information by Web page