Viola Systems ESERV-10 User manual

ESERV-10 User’s Manual
Version 2.2, June 2003

User’s Manual
Contents
Contents.............................................................................................................................................. 2
Copyright and Trademark ................................................................................................................... 3
Disclaimer and Revisions.................................................................................................................... 4
Declaration of Conformity ................................................................................................................... 5
Warranty and Safety Instructions........................................................................................................ 6
Specifically Dangerous Places and Places with Particular Risk of Damages .................................... 6
1. Introduction ..................................................................................................................................... 7
Internal Software.................................................................................................................... 8
2. Operation of ESERV-10.................................................................................................................. 9
Connection via Internet to Serial Port.................................................................................... 9
Web Server .......................................................................................................................... 10
3. Connectors and Switches ............................................................................................................. 11
Serial Port (RS-232, RS-422/485 -connector) ..................................................................... 11
Ethernet Connector..............................................................................................................12
DIP Switches........................................................................................................................ 12
LEDs .................................................................................................................................... 13
Power Supply Connector ..................................................................................................... 13
Product Information Label.................................................................................................... 13
4. Getting Started.............................................................................................................................. 14
Installation of the Device......................................................................................................14
Addresses Related to Internetworking................................................................................. 14
Connect the Device..............................................................................................................15
Install the Viola Configurator................................................................................................ 16
Add a New Device ............................................................................................................... 17
Assign the IP Address and Network Mask .......................................................................... 18
Creating duplicate configuration .......................................................................................... 19
5. ESERV-10 Configuration .............................................................................................................. 20
Configuring Using Viola Configurator .................................................................................. 20
Configuring Using ICMP PING ............................................................................................ 21
Configuring Using Telnet Connection.................................................................................. 22
Configuring Using Serial Port .............................................................................................. 23
6. Constructing and Saving Web Pages........................................................................................... 24
Construction of Web Pages ................................................................................................. 24
7. Features........................................................................................................................................ 25
Transmission Trigger Algorithms ......................................................................................... 25
Security of ESERV-10 ......................................................................................................... 25
E-mail Features.................................................................................................................... 26
COM Port Redirector SW .................................................................................................... 27
Appendix 1 Technical Specifications..................................................................................... 28
Appendix 2 Server Modes of ESERV-10............................................................................... 29
Appendix 3 Key Parameters of ESERV-10 ........................................................................... 30
Appendix 4 Supported AT Commands.................................................................................. 31
Appendix 5 Basics of Internetworking ................................................................................... 34
Appendix 6 ESERV-10 configuration parameters ................................................................. 36
Return Policy..................................................................................................................................... 40
Limited Warranty............................................................................................................................... 41
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User’s Manual
Copyright and Trademark
2003 Viola Systems Ltd. All rights to this manual are owned solely by Viola Systems Ltd (referred
to in this user’s guide as Viola Systems). All rights reserved. No part of the contents of this book
may be transmitted or reproduced in any form or by any means without the written permission of
Viola Systems.
Ethernet is a trademark of XEROX Corporation. Windows and Internet Explorer are trademarks of
Microsoft Corporation. Netscape is a trademark of Netscape Communications Corporation. All other
product names used in this manual are the properties of their respective owners and are
acknowledged.
Viola Systems Ltd.
Lemminkäisenkatu 32
FIN-20520 Turku
Finland
E-mail: [e-mail]
Technical Support
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
On-line http://www.violasystems.com
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User’s Manual
Disclaimer and Revisions
Viola Systems reserves the right to change the technical specifications or functions of its products,
or to discontinue the manufacture of any of its products or to discontinue the support of any of its
products, without any written announcement and urges its customers to ensure, that the information
at their disposal is valid.
Viola software and programs are delivered “as is”. The manufacturer does not grant any kind of
warranty including guarantees on suitability and applicability to a certain application. Under no
circumstances is the manufacturer or the developer of a program responsible for any possible
damages caused by the use of a program. The names of the programs as well as all copyrights
relating to the programs are sole property of Viola Systems. Any transfer, licensing to a third party,
leasing, renting, transportation, copying, editing, translating, modifying into another programming
language or reverse engineering for any intent is forbidden without the written consent of Viola
Systems.
Viola Systems has attempted to verify all information in this manual as of the publication date. We
assume no responsibility for any errors that may appear in this guide. Information in this manual
may change without prior notice from Viola Systems.
Revision History:
10/2002 HW Release 2.1, Preliminary version, released
11/2002 Document Release 2.1a, Preliminary version, released
03/2003 Document Release 2.1b, Preliminary version, released
05/2003 Document Release 2.1c, Preliminary version
06/2003 Document Release 2.2, Preliminary version
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User’s Manual
Declaration of Conformity
(according to ISO/IEC Guide 22 and EN 45014)
Manufacturer’s Name:
Viola Systems Ltd.
Manufacturer’s Address:
Lemminkäisenkatu 32, FIN-20520 Turku, Finland
declares that this product:
Product Name:
Device Server
Model Name(s):
ESERV-10 and ESERV-10 OEM
conforms to the following standards:
EMC:
EN 55022 Emission Test (Class A)
1. Radiated Emissions (30-1000MHz)
2. Conducted Emissions (0.15-30MHz)
EN 50082-1 Immunity Test
1. IEC 801-3: Radio Frequency Electromagnetic Field
2. IEC 801-2: Electrostatic Discharge
3. IEC 801-4: Fast Transients, AC Power Ports and Signal cables
Supplementary Information:
“The product complies with the requirements of the Low Voltage Directive 73/23/EEC and
EMC directive 89/336/EEC.”
Warning: This is a Class A product. In a domestic environment this product may cause radio
interference in which case the user may be required to take adequate measures.
Manufacturer’s Contact:
Director of Quality Assurance
Viola Systems Ltd.
Lemminkäisenkatu 32, FIN-20520 Turku, Finland
Phone: [phone]
Fax: [phone]
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User’s Manual
Warranty and Safety Instructions
Read these safety instructions carefully before using the product:
Warranty will be void, if the product is used in any way, which is in contradiction with the
instructions given this manual, or if the device server has been tampered with.
The devices mentioned in this manual are to be used only according to the instructions described in
this manual. Faultless and safe operation of the devices can be guaranteed only if the transport,
storage, operation and handling of the devices is appropriate. This also applies to the maintenance
of the products.
To prevent damage both the device server and any terminal devices must always be switched OFF
before connecting or disconnecting any cables. It should be ascertained that different devices used
have the same ground potential. Before connecting any power cables the output voltage of the
power supply should be checked.
Specifically Dangerous Places and Places with Particular
Risk of Damages
The product is not designed to be used in dangerous places including, but not limited to, equipment
monitoring patients, nuclear plants, aircrafts, weapon systems, traffic control devices or for any
other similar purposes with the possibility of risk for life or serious risk for health. Should the product
be used for the above purposes or in connection with any such purpose, Viola Systems shall under
no circumstances have any liability for such use.
Places with particular risk of damages shall include, but not be limited to, factories and similar
production plants, water transport vessels, railways or other similar places in connection with which
the malfunctioning of the product may cause major financial damages. Should the product be used
for purposes mentioned in this section without a prior written permission of Viola Systems, Viola
Systems shall under no circumstances have any liability for such use.
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User’s Manual
1. Introduction
This User’s Manual describes the operation of the ESERV-10, ESERV-10S, ESERV-10S Bridge
and ESERV-10 OEM device servers. All devices are referred to in this User’s Manual as ESERV-
10, unless otherwise mentioned.
ESERV-10 is designed to offer transparent connection between a serial device and Ethernet
without the need to modify the existing design of the device. With ESERV-10 manufacturers and
system suppliers can connect their products such as home and industrial automation devices,
measuring devices and sensors through Ethernet to Internet. Devices can be controlled and
monitored using a standard Web browser (Internet Explorer, Netscape Navigator), a Telnet
connection or some other programs with a TCP/IP connection.
ESERV-10
SERIAL
DEVICE
10BASE-T
ETHERNET POWER
SUPPLY
ESERV-10 device servers can be used, for example, in cases of:
•Remote reading of access control and work time monitoring systems
•Software updates and configuration over the Internet
•Motion sensors
•Remote control of display boards
•Global follow-up of systems
•Replacement of serial cable network with ready-made Ethernet network
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User’s Manual
ESERV-10 device server works in three different operating modes, each of which put emphasis on
a particular functionality. First, ESERV-10 is able to operate as a serial device server in both server
and client modes. Second, ESERV-10 functions through sending and receiving e-mail by using
SMTP (Simple Mail Transfer Protocol) and POP3 (Post Office Protocol) protocols, either
automatically or manually. Third, the remote control of ESERV-10 can be easily performed over the
network or locally with AT commands like in modems.
ESERV-10 device server includes the core protocols of TCP/IP and a built-in Web server. The
Internet Protocol (IP) is used for network communications and the Transmission Control Protocol
(TCP) to assure that no data is lost or duplicated, and that everything sent to the connection arrives
correctly at the target. The built-in Web server uses a graphic Java applet, which downloads from
the device server to the browser. This applet works as a virtual user interface for the device.
ESERV-10 device server can handle all Internet related functions by acting as a modem towards
the device connected to a serial port.
Internal Software
ESERV-10’s internal software consists of a TCP/IP stack, an embedded HTTP/Web server and
application software for a serial device connectivity.
OSI Layer ESERV-10 Implementation
7 – Application HTTP 1.1 Serial port POP3 SMTP BOOTP TFTP Serial port Control
6 – Presentation
5 – Session
4 – Transport TCP UDP
3 – Network IP version 4, ICMP, ARP
2 – Link IEEE 802.3
1 – Physical 10Base-T Ethernet (Twisted pair)
Viola Systems’ Ethernet driver, TCP/IP stack, HTTP/Web server and operating system are
optimized for embedded devices and are implemented with ANSI-C to ensure portability.
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User’s Manual
2. Operation of ESERV-10
The ESERV-10 device server consists of a 16-bit RISC processor, a 130-kByte Flash-memory for
Web-pages, an Ethernet controller with 10 Mbps RJ45 network interface and a serial port driver
with RS-232 or RS-422/485 interface. The following figure shows the block diagram of ESERV-10.
A more detailed technical specification of the device is given in the Appendix 1.
DIP
Switch
COL Led
ACT Led
RJ45
10BaseT port
Processor, OS
TCP/IP, Applications
Ethernet
Controller
Memory
Serial port
(RS-232,
422,485)
DC
Power
The operation of ESERV-10 can be divided into following categories:
•Connection via the Internet to a serial port
•Web server
A detailed look to the available server modes of the ESERV-10 is given in the Appendix 2.
Connection via Internet to Serial Port
ESERV-10 device server operates as an invisible modem from the serial device’s point of view.
ESERV-10 processes the data received from the Internet so that only the “payload” is directed into
the serial port without the Ethernet or TCP/IP parts. The data from the serial port is encapsulated by
ESERV-10 into the TCP/IP protocol and transmitted forward through Ethernet. Connection to the
serial port can be achieved via the Internet with TCP and UDP through a configurable port.
IP TCP/UDP DATA
Local Network / Internet
ESERV-10
DATA
Serial Device
Transmission Control Protocol (TCP) is a so-called virtual circuit / connection-oriented protocol that
establishes a fixed virtual connection between two devices. TCP takes care of the entireness of the
data by using checksum and data transmission which use automatic handshakes. Since TCP
establishes a fixed connection between devices, the serial port can only be used from one TCP
connection at a time. The TCP protocol is used, for example, in the Telnet program.
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User’s Manual
User Datagram Protocol (UDP) is a connectionless protocol that doesn’t require specific opening or
closing of the connection. UDP also uses checksum to ensure the entireness of the data, but it
doesn’t automatically take care of retransmission and it doesn’t ensure the receiving of the data.
UDP is less secure than TCP, but it is lighter and, therefore, more useful for general-purpose
applications. Since UDP doesn’t require a fixed connection, several Internet devices can use the
serial port simultaneously. ESERV-10 operates so that it transmits all the data coming to UDP port
(which is configurable) to that IP address from which a connection has lastly been established. Due
to that, ESERV-10’s UDP implementation is well suited for question-answer -type data
transmission, in case the retransmission feature is already built-in (which is the case in most serial
protocols).
As a conclusion one could say that the use of UDP protocol is simpler and even recommended if
possible. Some firewalls prevent UDP connections due to security reasons since Windows
networks use it to share files. When using such programs as Telnet, or if the data transmission
should be ensured, TCP may be a better alternative. It should be noted that in both cases the
firewalls might prevent outgoing traffic. In such occasions the firewall must be configured to support
the ports and the IP addresses used by ESERV-10 if one prefers to establish a connection
outwards (from the Internet).
Web Server
ESERV-10 includes a Web server in the TCP port 80. HTML pages, figures, documents and Java
applets smaller that 130 kB can be downloaded into that port. After downloading, these files are
accessible with a standard Web browser (Internet Explorer or Netscape Navigator) by writing the
ESERV-10’s IP address and the filename, for example http://172.16.1.1/mypage.html. If the file is
not available, the unit will return an error page.
An access to the ESERV-10 without the filename (http:// 172.16.1.1) results in that the unit tries to
find the default page (index.html) from its memory. If this page is available, ESERV-10 returns it,
otherwise an error page is displayed.
The contents of Web pages can be created by using standard development tools. However, before
they are downloaded into the unit’s memory, separate files must be copied into one single file that
ESERV-10 recognizes. This can be done with a Viola Configurator program.
All kind of files can be downloaded into ESERV-10’s memory. The text database “mimetypes.txt” in
the Viola Configurator’s set up directory (for example C:\Program Files\Viola Configurator\) lists all
the file types that ESERV-10 recognizes. The database consists of the file type extension (like .txt)
and the corresponding MIME type (like text/plain). It is possible to add more file types into the
database.
Web server can be used to save a HTML page, which includes a Java applet. That can be
downloaded into the user’s Web browser and it can be used as a virtual user interface in the
following manner:
1. User types ESERV-10’s address in the browser’s address field.
2. ESERV-10 returns the HTML page including the Java applet.
3. The applet runs in the user’s browser without reducing the processing capacity of
ESERV-10.
4. The applet makes a TCP or a UDP connection to ESERV-10’s configurable port, enabling
information transmission over the Internet between the applet and the serial port.
ESERV-10’s Web server supports 10 simultaneous connections. To ensure maximum capacity, the
number of objects (pictures, HTML pages, applets) should be limited to 10.
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