DCB EtherPath Manuale utente
Revised June 3, 2004
Firmware Version 5.3
EtherPath
User’s Guide
FCC Statement
This device complies with the limits for a Class B digital device,
pursuant to Part 15 of the FCC rules. Operation is subject to the
following two conditions:
(1) This device may not cause harmful interference.
(2) This device must accept any interference received,
including interference that may cause undesired operation.
CE Marking Warning
This is a class B product. In a domestic environment this product
may cause radio interference in which case the user may be required
to take adequate measures.
Copyright 1998…2004. All rights reserved.
Version 5.3
All trademarks and trade names are the properties of their respective
owners.
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TABLE OF CONTENTS
Chapter 1 Introduction............................................1
EtherPath Functions.....................................................2
Other Features ............................................................. 4
Physical Details...........................................................6
Chapter 2 Installation ............................................11
Overview...................................................................11
LAN Installation........................................................11
Chapter 3 Terminal/Telnet Configuration...........13
Overview...................................................................13
Terminal Configuration.............................................14
Telnet Configuration .................................................15
Terminal/Telnet Interface..........................................17
Chapter 4 Browser Configuration........................36
Overview...................................................................36
Connection Procedure ...............................................36
Web-based Interface..................................................38
Chapter 5 Operation ..............................................53
Client/Server Point-to-Point (Nailed-Up) Mode.......53
Server Mode..............................................................55
Client/Server Point-to-Multiple-Point
(EtherModem) Mode.................................................55
Client (Reverse Telnet) Mode...................................58
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Chapter 6.................................................................60
Configuration Security...........................................60
Overview...................................................................60
Level 0:......................................................................61
Level 1:......................................................................61
Level 2:......................................................................62
Level 3:......................................................................62
Chapter 7 Troubleshooting....................................64
Hardware Problems...................................................64
Can't Connect via the LAN........................................66
Other Problems..........................................................68
Checking Device Operation.......................................70
Appendix A Specifications.....................................71
EtherPath Specifications............................................71
RS-232 PIN Assignments..........................................72
Control Signal Operation...........................................73
CABLES....................................................................75
Appendix B Programming.....................................77
Introduction...............................................................77
Description and Behavior..........................................78
Application Notes......................................................81
Appendix C AT Command Summary ..................82
AT Commands...........................................................82
AT Command Responses ..........................................83
Introduction
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AT Command Operation...........................................83
Appendix D RS-422/ RS-485 Interface.................84
Introduction...............................................................84
RS-422 / 4-Wire RS-485 Interface Pinout.................85
2-Wire RS-485 Interface Pinout................................86
1
Chapter 1
Introduction
This chapter provides an overview of the
EtherPath's features and capabilities.
ongratulations on the purchase of your new EtherPath. The
EtherPath is a versatile product that enables serial communications
devices to operate via Ethernet. It is designed to easily connect a
serial port device to your network. A remote PC or other serial
device can then be used to monitor, configure, manage and send or
receive data to the serial port device through the LAN/WAN.
The EtherPath can receive data from any Serial device, convert the
data to a valid IP packet, and transmit that data over the
LAN/WAN. Serial devices can then be accessed from anywhere on
your LAN/WAN by any workstation computer running telnet,
dedicated software, or COM: port redirection software. Two
EtherPaths may be used in “nailed-up” mode to build a “RS-232
path” through the WAN/LAN. Multiple EtherPaths may be
connected via Ethernet by using them in Point-to-Multiple point
"AT Dial " mode.
Some serial port devices in common use are Bar Code Readers,
UPSs, SCADA RTUs, security alarms, access control devices, time
clocks, POS terminals, and multiplexers.
For easy connection to your LAN, the EtherPath supports both
10BaseT and 100BaseT connections.
C
EtherPath User’s Guide
2
EtherPath Functions
The EtherPath can be used in several modes – simple Client/Server
or Server, as illustrated below, point-to-multiple-point
(EtherModem) Client/Server, and reverse telnet Client. These
modes are described below.
Figure 1: Modes of Operation
Client/Server Mode
In this mode, two EtherPaths are used. Both are connected to serial
RS-232 devices. This is termed a “Nailed-Up” connection.
•The "Client" EtherPath will automatically establish a
connection to the "Server" EtherPath upon power-up.
•The device on one EtherPath communicates with the other
serial port device as if it was directly connected via a serial port
cable.
Introduction
3
•The EtherPaths and the LAN are completely transparent to PC
application and serial port device.
Server Mode
This mode requires only a single EtherPath. The EtherPath is
connected to the serial port device, and to the LAN.
Users on the LAN can then connect to the serial port device and
communicate with it via Telnet, using any assigned IP and port
address. Most LAN connected workstations provide support for
communication via Telnet.
A special-purpose utility program or port redirector program may be
used instead of Telnet, or the user may create custom software using
Visual Basic, C++, or other network programming tools. By using
port redirection, the EtherPath may function as a remote serial port
on a PC.
Point-to-Multiple-Point (EtherModem) Mode
Point-to-multiple-point (EtherModem) operation allows a single
EtherPath running in client mode to connect to multiple server-
mode EtherPaths, one at a time, under the control of the attached
RS-232 device. The client operates similar to a modem with “AT”
dialing enabled. The attached device treats the EtherPath as if it
was a modem, using remote IP addresses instead of telephone
numbers.
Reverse Telnet (Telnet Client) Mode
This mode requires only a single EtherPath. The EtherPath is
connected to the serial port device, and to the LAN.
The EtherPath will connect to most remote telnet servers under user
control by using “reverse telnet” or telnet client operation. The
EtherPath User’s Guide
4
EtherPath will connect to any port number under user control with
either hardware (pin6) dialing or AT dialing.
By using the "AT Dial" commands, the connected device can direct
the EtherPath to connect to multiple remote devices, one at a time.
Other Features
Automatic Connection
When used in Client/Server mode, the “Client” EtherPath will
automatically establish a connection to the “Server” EtherPath on
power-up, or under the control of an RS-232 control signal.
AT Commands
The EtherPath responds to most common AT commands when in
the Client mode. Commands are listed in the Appendix.
Connection Recovery
The EtherPath uses a proprietary protocol to ensure the client/server
session always exists on TCP/IP. When data hasn't been transferred
through the connection for some time, the EtherPath will
communicate with the other device (either EtherPath or PC) to
ensure that the connection is still open.
If there is no response, the device will reset to the initial state, and
attempt to reconnect.
Also, if the RS-232 link is broken, it will be reconnected
automatically if possible (when in Hardware-connect mode).
This operation is described in the Appendix.
Protocol Conversion
The RS-232 device at the client end and the device at the server end
of a link do not have to use the same communications protocols on
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