B&B Electronics RS-232 User manual

Manual Documentation Number: ESP904-4513m
B&B Electronics Mfg Co Inc –707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone] –www.bb-elec.com
B&B Electronics Ltd –Westlink Commercial Park –Oranmore, Galway, Ireland –Ph [phone] –Fax [phone] –www.bb-europe.com
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Et th he er rn ne et t S Se er ri ia al l S Se er rv ve er r
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Mo od de el ls s: : E ES SP P9 90 04 4, , E ES SP P9 90 04 4E E

Manual Documentation Number: ESP904-4513m
B&B Electronics Mfg Co Inc –707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone] –www.bb-elec.com
B&B Electronics Ltd –Westlink Commercial Park –Oranmore, Galway, Ireland –Ph [phone] –Fax [phone] –www.bb-europe.com
International Headquarters
B&B Electronics Mfg. Co. Inc.
707 Dayton Road
Ottawa, IL 61350 USA
Phone [phone] -- General Fax [phone]
Website: www.bb-elec.com
Sales e-mail: [e-mail] -- Fax [phone]
Technical Support e-mail: suppor[email protected] -- Fax [phone]
European Headquarters
B&B Electronics Ltd.
Westlink Commercial Park
Oranmore, Co. Galway, Ireland
Phone [phone] -- Fax [phone]
Website: www.bb-europe.com
Sales e-mail: [e-mail]
Technical Support e-mail: [e-mail]
© B&B Electronics –January 2008

Manual Documentation Number: ESP904-4513m
B&B Electronics Mfg Co Inc –707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone] –www.bb-elec.com
B&B Electronics Ltd –Westlink Commercial Park –Oranmore, Galway, Ireland –Ph [phone] –Fax [phone] –www.bb-europe.com
2008 B&B Electronics. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photography, recording, or any information storage and retrieval system without written consent. Information
in this manual is subject to change without notice, and does not represent a commitment on the part of B&B Electronics.
B&B Electronics shall not be liable for incidental or consequential damages resulting from the furnishing, performance, or use of
this manual.
All brand names used in this manual are the registered trademarks of their respective owners. The use of trademarks or other
designations in this publication is for reference purposes only and does not constitute an endorsement by the trademark holder.

Manual Documentation Number: ESP904-4513m Table of Contents I
B&B Electronics Mfg Co Inc –707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone] –www.bb-elec.com
B&B Electronics Ltd –Westlink Commercial Park –Oranmore, Galway, Ireland –Ph [phone] –Fax [phone] –www.bb-europe.com
T
Ta ab bl le e o of f C Co on nt te en nt ts s
CHAPTER 1: INTRODUCTION.............................................................................. 1
FEATURES.................................................................................................................. 1
COMMUNICATION MODES ......................................................................................... 2
Direct IP Mode ..................................................................................................... 2
Virtual COM Mode ............................................................................................... 2
Paired Mode ......................................................................................................... 3
Heart Beat............................................................................................................. 3
ESP904 QUICK START GUIDE.................................................................................... 4
Hardware Setup .................................................................................................... 4
Software Installation............................................................................................. 4
ESP904 Configuration.......................................................................................... 5
Install Virtual COM Ports on PC.......................................................................... 6
Check Communications ........................................................................................ 6
CHAPTER 2: MAKING THE HARDWARE CONNECTIONS ........................... 7
PACKAGE CHECKLIST................................................................................................ 7
ESP904 CONNECTIONS,INDICATORS AND RESET SWITCH ........................................ 7
Indicator Lights..................................................................................................... 8
Ethernet Connector............................................................................................... 8
Power Connector.................................................................................................. 8
Reset Button.......................................................................................................... 8
Serial Ports ........................................................................................................... 9
SERIAL SERVER/PORT OPERATIONAL MODES ........................................................... 9
Default Mode ........................................................................................................ 9
Console Mode ..................................................................................................... 10
Upgrade Mode.................................................................................................... 10
RS-232 Mode....................................................................................................... 10
RS-422 Mode....................................................................................................... 10
RS-485 Mode....................................................................................................... 11
ESP904 SERIAL PORT CONNECTOR PIN-OUTS ......................................................... 12
CHAPTER 3: INSTALLING THE VLINX ESP SOFTWARE............................ 13
SOFTWARE INSTALLATION....................................................................................... 13
Automatic Installation......................................................................................... 13
Manual Installation............................................................................................. 13
Updating an Existing Installation....................................................................... 15
Opening the ESP Manager ................................................................................. 16

II Table of Contents Manual Documentation Number: ESP904-4513m
B&B Electronics Mfg Co Inc –707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone] –www.bb-elec.com
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CHAPTER 4: USING ESP MANAGER................................................................. 17
HARDWARE SETUP .................................................................................................. 17
SOFTWARE SETUP.................................................................................................... 18
SOFTWARE OVERVIEW ............................................................................................ 19
Menus.................................................................................................................. 19
Server Icons Pane............................................................................................... 21
Serial Server / Virtual COM Lists....................................................................... 21
Status Bar............................................................................................................ 22
SEARCH FOR SERVERS ............................................................................................. 22
CONFIGURE SERVER PROPERTIES ............................................................................ 23
CHAPTER 5: CONFIGURING THE ESP904 SERVER PROPERTIES ........... 27
DESCRIPTION OF THE SERVER PROPERTIES.............................................................. 28
Server Name........................................................................................................ 28
Serial Number..................................................................................................... 28
Password............................................................................................................. 28
DHCP ................................................................................................................. 28
IP Address........................................................................................................... 29
Netmask............................................................................................................... 30
Gateway.............................................................................................................. 30
MAC Address...................................................................................................... 30
Version & Date ................................................................................................... 30
Link Status........................................................................................................... 30
Server Serial Port ............................................................................................... 30
Baud Rate............................................................................................................ 30
Data/Parity/Stop................................................................................................. 31
Flow Control....................................................................................................... 31
TCP/UDP Protocol............................................................................................. 31
Serial Timeout..................................................................................................... 32
TCP Alive Timeout.............................................................................................. 32
Connection Mode................................................................................................ 32
Delimiter HEX 1 and Delimiter HEX 2............................................................... 32
Force Transmit ................................................................................................... 33
Port Status........................................................................................................... 33
TCP/UDP Port.................................................................................................... 33
Serial Port Mode................................................................................................. 33
Connection At ..................................................................................................... 34
Max Connection.................................................................................................. 34
Remote IP Address.............................................................................................. 34
Update/Save........................................................................................................ 34
CHAPTER 6: INSTALLING VIRTUAL COM PORTS ...................................... 39
VIRTUAL COM PORT INSTALLATION ...................................................................... 39

Manual Documentation Number: ESP904-4513m Table of Contents III
B&B Electronics Mfg Co Inc –707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone] –www.bb-elec.com
B&B Electronics Ltd –Westlink Commercial Park –Oranmore, Galway, Ireland –Ph [phone] –Fax [phone] –www.bb-europe.com
MATCHING THE ESP904 AND VIRTUAL COM PORT SETTINGS................................ 42
CHAPTER 7: REMOVING VIRTUAL COM PORTS......................................... 45
REMOVING THE VIRTUAL COM PORT WITH ESP MANAGER ................................... 45
REMOVING THE VIRTUAL COM PORT USING DEVICE MANAGER ............................ 46
CHAPTER 8: UPGRADING THE ESP904 FIRMWARE.................................... 49
DOWNLOADING THE FIRMWARE.............................................................................. 49
UPGRADING VIA ESP MANAGER............................................................................. 49
Preparing the Software....................................................................................... 49
Upgrading the Firmware .................................................................................... 50
CHAPTER 9: USING CONSOLE MODE............................................................. 51
CONSOLE MODE SETUP ........................................................................................... 51
Navigating the Configuration Menus.................................................................. 52
Using a Password ............................................................................................... 53
CHAPTER 10: USING THE WEB SERVER ........................................................ 55
SETTING SERVER PROPERTIES ................................................................................. 55
CHAPTER 11: USING TELNET............................................................................ 59
CONFIGURATION USING TELNET ............................................................................. 59
Navigating the Configuration Menu ................................................................... 60
CHAPTER 12: ESP904 TECHNICAL DATA....................................................... 63
APPENDIX A: RS-232 CONNECTIONS............................................................... 67
ESP904 DB-9 PIN-OUTS IN RS-232 MODE.............................................................. 67
RS-232 Straight-through Cable Connections...................................................... 68
RS-232 Crossover (null modem) Cable Connections.......................................... 68
RS-232 Crossover DB-9 to DB-25 Conversion Connections.............................. 69
RS-232 DTE Loopback Connections................................................................... 70
APPENDIX B: RS-422 CONNECTIONS............................................................... 71
ESP904 DB-9 PIN-OUTS IN RS-422 MODE.............................................................. 71
APPENDIX C: RS-485 CONNECTIONS............................................................... 75
ESP904 DB-9 PIN-OUT IN RS-485 MODE................................................................ 75
APPENDIX D: NETWORK CONNECTIONS...................................................... 77
STANDARD ETHERNET CABLE RJ-45 PIN-OUT......................................................... 77
CROSSOVER ETHERNET CABLE RJ-45 PIN-OUT ....................................................... 78

IV Table of Contents Manual Documentation Number: ESP904-4513m
B&B Electronics Mfg Co Inc –707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone] –www.bb-elec.com
B&B Electronics Ltd –Westlink Commercial Park –Oranmore, Galway, Ireland –Ph [phone] –Fax [phone] –www.bb-europe.com

Introduction
Manual Documentation Number: ESP904-4513m Chapter 1 1
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C
Ch ha ap pt te er r 1 1: : I IN NT TR RO OD DU UC CT TI IO ON N
The VLINX Model ESP904 Quad-Port Ethernet Serial Server provides
Ethernet to Serial connections for RS-232, RS-422 or RS-485 devices. The
serial ports can be accessed over a LAN/WAN using Direct IP Mode, Virtual
COM Port, or Paired Mode connections. The 10/100 Mbps Ethernet
connection auto-selects 10BaseT or 100BaseTX and indicates the type of
connection with a bi-color link light.
Features
4 multi-interface serial ports - RS-232, RS-422, RS-485; software
selectable connections
10/100 Mbps Ethernet with Auto Selection
LAN and WAN Communications
TCP or UDP Client or Server operation - configurable
Software Support - Windows 98/ME/2000/2003/NT 4.0/XP and Vista
Firmware Upload for future revisions/upgrades
Configuration of Ethernet and serial port settings can be accomplished
using any of four methods:
oVLINX ESP Manager Software for Windows allows
configuration via a network connection or directly from the
Ethernet port of a computer (using an Ethernet crossover cable).
oWeb Server allows configuration via the network using any
web browser.
oTelnet allows configuration via the network by accessing the
setup configuration menu.
oConsole Mode allows configuration through an RS-232 serial
port in using a VT100 Terminal Emulation program and an RS-
232 crossover cable.
Virtual COM Driver Software for Windows - installs a virtual COM
port, viewable in the Windows Device Manager under Ports (COM &
LPT). Virtual COM port provides access to any of the ports on the
ESP904, like any other serial port (legacy, PCI, USB or PCMCIA) on
the computer. Any program running on the computer and using
Windows-based COM ports can access the serial devices attached to the

Introduction
2 Chapter 1 Manual Documentation Number: ESP904-4513m
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ESP904. The LAN becomes transparent to the serial device and the
software running on the PC.
Heart Beat Connection - selectable protocol ensures reliable
communications in Virtual COM Port or Paired Connection modes. This
feature restores the connections if communications are temporarily lost
at either end due to loss of power or the Ethernet connection.
Communication Modes
The ESP904 enables communication with serial devices over a LAN or
WAN. Serial devices no longer are limited to a physical connection to the PC
COM port. They can be installed anywhere on the LAN using TCP/IP or
UDP/IP communications. This allows traditional Windows PC software
access to serial devices anywhere on the LAN/WAN network.
Direct IP Mode
Direct IP connections allow applications using TCP/IP or UDP/IP socket
programs to communicate with the asynchronous serial ports on the ESP904.
In this type of application the ESP904 is configured as a TCP or UDP server.
The socket program running on the PC establishes a communication
connection with the ESP904. The data is sent directly to and from the serial
port on the server. When using UDP protocol the server can be configured to
broadcast data to and receive data from multiple IP addresses.
Virtual COM Mode
Use Install Virtual COM to add a driver, to provide a virtual COM port on
the computer. The new COM port shows up in the Device Manager.
Windows programs using standard Windows API calls are able to interface
to virtual COM ports. When a program on the PC opens the new COM port,
it communicates with the remote serial device connected to one of the ports
on the ESP904.
After connection, the LAN is transparent to the program and serial device.
Applications are able to work just as if the serial device is connected directly
to a physical COM port on the computer. The virtual COM port software
converts the application’s data into IP packets, sends it across the network to
the ESP904, which converts the IP packet back to serial data and sends the
data out a serial port located on the ESP904.

Introduction
Manual Documentation Number: ESP904-4513m Chapter 1 3
B&B Electronics Mfg Co Inc –707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone] –www.bb-elec.com
B&B Electronics Ltd –Westlink Commercial Park –Oranmore, Galway, Ireland –Ph [phone] –Fax [phone] –www.bb-europe.com
To use this mode, the ESP904 must be set to either TCP/server or
UDP/server with a designated communication port number. The virtual COM
driver is the TCP or UDP client.
Paired Mode
Paired Mode is also called serial tunneling. In this mode any two serial
devices that can communicate with a serial link will be able to communicate
using two ESP904s and the LAN.
Two ESP904s are connected to a network, one configured as a TCP or UDP
client and the other as a TCP/UDP server. When setting up the server the
remote IP address section must contain the address of the client. This will
allow the client’s IP address to pass the IP address-filtering feature of the
server. Conversely, the Remote IP address of the client must contain the
server’s IP address. Both communication port numbers must be the same.
Heart Beat
The Heart Beat protocol connection provides a reliable communications
connection in Virtual COM Port Mode or with Paired Connection Mode.
This feature restores the connection if communications are temporarily lost at
either end due to loss of power or Ethernet connection.
Without this feature a device that loses a connection and stops
communicating would not be able to reconnect without human intervention.
A TCP data connection can be lost when there is a power failure or
temporary loss of an Ethernet connection on either the client or server. If a
loss occurs the Heart Beat feature will try to reconnect the TCP data
connection every five seconds until communications is established again. The
Heart Beat feature is available for use in Virtual COM Port Mode and Paired
Connection Mode. This is not available when using a UDP application.

Introduction
4 Chapter 1 Manual Documentation Number: ESP904-4513m
B&B Electronics Mfg Co Inc –707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone] –www.bb-elec.com
B&B Electronics Ltd –Westlink Commercial Park –Oranmore, Galway, Ireland –Ph [phone] –Fax [phone] –www.bb-europe.com
ESP904 Quick Start Guide
For descriptive purposes this Quick Start Guide considers a typical
configuration consisting of a PC connected via an Ethernet LAN to an
ESP904 Serial Server connected to the RS-232 port of a serial device.
Hardware Setup
Figure 1. Quick Start Hardware Setup
Step 1: Connect the ESP904 to the network using a standard network cable
Step 2: Connect the ESP904 to the RS-232 serial device.
N
No ot te e: :
If the serial device is configured as a DCE use a straight-through serial cable. If
the serial device is configured as a DTE use a crossover (null modem) cable.
Step 3: Apply power to the Serial Server.
Software Installation
Using the CD included with the ESP904, install the VLINX ESP Manager
software on the configuring computer.

Introduction
Manual Documentation Number: ESP904-4513m Chapter 1 5
B&B Electronics Mfg Co Inc –707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone] –www.bb-elec.com
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ESP904 Configuration
Step 1: Open the ESP Manager software. It will automatically search for
any reachable (ESP90x) Serial Servers. A list of all Serial Servers
connected to the LAN will appear in the Serial Server List window.
Step 2: Double click the first ESP904 port on the list (4000) to bring up the
Server Properties configuration screen.
Figure 2. The Server Properties Window
Step 3: Change the Server Properties as required.
Enable DHCP to allow the ESP904 to generate its own IP
address
OR
Obtain appropriate static IP, Netmask and Gateway addresses
from your Network Administrator (recommended)
Set the Console Mode property to RS-232 to match the serial
device connected to the ESP904 serial port 1.
Set Baud Rate, Data/Parity/Stop, and Flow Control to match
the configuration of the serial device connected to the ESP904
serial port
Step 4: When the parameters have been set, click Update. Following the
prompts in the dialogue boxes, Restart the Serial Server and
Search all reachable servers again.
Step 5: Re-enter Server Properties to verify the changes have taken effect,
or to view/change the configuration of other ports. Each port must
be configured separately.

Introduction
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B&B Electronics Mfg Co Inc –707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone] –www.bb-elec.com
B&B Electronics Ltd –Westlink Commercial Park –Oranmore, Galway, Ireland –Ph [phone] –Fax [phone] –www.bb-europe.com
Install Virtual COM Ports on PC
Step 1: From the Windows Start menu, run the Install Virtual COM Ports
utility included with the VLINX software,
Step 2: Search for all servers on the network
Step 3: Select the first port (4000) and map it to an unused COM port (e.g.
Port 15). Configure it for TCP protocol and the appropriate IP
address (determined in the last section).
Figure 3. Configuring the Virtual COM Port
Check Communications
Step 1: From the Windows Start menu, run HyperTerminal
Step 2: Configure HyperTerminal to connect using the COM port
configured in the last section (e.g. Port 15).
Step 3: Set Baud Rate, Data/Parity/Stop, and Flow Control to match the
configuration of the serial device connected to the ESP904 serial
port.
Step 4: Communications with the serial device should now be operational.

Making Hardware Connections
Manual Documentation Number: ESP904-4513m Chapter 2 7
B&B Electronics Mfg Co Inc –707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone] –www.bb-elec.com
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C
Ch ha ap pt te er r 2 2: : M MA AK KI IN NG G T TH HE E H HA AR RD DW WA AR RE E
C
CO ON NN NE EC CT TI IO ON NS S
Package Checklist
The ESP904 4-port serial server is shipped with the following items
included:
ESP904 Serial Server Module
Power supply
This manual
CD-ROM disc with manual, VLINX ESP Manager and Virtual COM
Driver software for Windows 98/ME/2000/2003/XP/NT 4.0/Vista
ESP904 Connections, Indicators and Reset Switch
The ESP904 has:
Seven indicator LEDs
One Ethernet connector
A power connector
A recessed reset switch
Four serial port connectors

Making Hardware Connections
8 Chapter 2 Manual Documentation Number: ESP904-4513m
B&B Electronics Mfg Co Inc –707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone] –www.bb-elec.com
B&B Electronics Ltd –Westlink Commercial Park –Oranmore, Galway, Ireland –Ph [phone] –Fax [phone] –www.bb-europe.com
Indicator Lights
Light
Indication
Power
Red - power is applied
Link
Yellow –10BaseT Ethernet connection established
Green –100BaseTX Ethernet connection established
Ready
Flashing Green –system is ready
Serial (4)
When set up as a TCP server:
Steady Green - client has made a connection,
communications starting
Flashing Green –data present at serial port
Light off –connection closed
When setup in UDP mode:
Steady Green (all ports)
Flashing Green –data is being transmitted
Ethernet Connector
The ESP904 has a standard RJ-45 receptacle mounted in the top edge of the
chassis. The ESP904 can be connected to an Ethernet hub, switch, or wall
plate using a standard straight-through RJ-45 (male) Ethernet cable. To
connect directly to an RJ45 Ethernet port on a PC or laptop a crossover
Ethernet cable must be used.
N
No ot te e: :
Refer to Appendix D for details on Network Cables
Power Connector
Plug the ultra-miniature phone plug from the included power supply into the
power jack and then plug the supply in. When power is applied the Red
power light will illuminate. The tip of the power plug is positive; the sleeve
is negative.
Reset Button
This switch resets the unit, similar to the effect of removing/applying power.
The Reset switch is recessed to avoid accidental operation. To reset the unit,
insert a small plastic tool, press lightly and hold for 3 seconds. The Link and
Ready lights will go out and then come back on.

Making Hardware Connections
Manual Documentation Number: ESP904-4513m Chapter 2 9
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Network
Connector
RJ-45
female Power jack
2.5 mm Tip (+)
Reset
Switch
Figure 4. Top View of the ESP904
Serial Ports
The ESP904 has four serial ports, each configurable through software as RS-
232, RS-422 or RS-485 interfaces. When in RS-232 mode the interfaces are
configured as DTEs (Data Terminal Equipment).The connectors are DB-9M.
Serial Ports
1234
Figure 5. The ESP904 Serial Port Connectors
Serial Server/Port Operational Modes
Using the ESP Manager the ESP904 Serial Server can be put into Console
Mode, Default Mode or Upgrade Mode. The serial ports can be configured
for RS-232, RS-422 or RS-485 operation.
Default Mode
When Default Mode is selected and the Server Properties are Updated
(Saved) all the configuration settings return to their default values. The
default settings for the ESP904 serial ports are: Console Mode for Port 1;
RS-232 mode for Ports 2, 3 and 4.
N
No ot te e: :
Refer to Chapter 5 for details on Server Configuration settings Refer to Chapter
12 for Serial Server default parameters.

Making Hardware Connections
10 Chapter 2 Manual Documentation Number: ESP904-4513m
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Console Mode
In Console Mode the ESP904 Configuration Menu can be accessed from a
PC by connecting its RS-232 serial port to Port 1. Since the PC is a DTE
device, and the ESP904 serial ports are configured as DTEs (with DB-9M
connectors), a null modem crossover cable must be used.
In Console Mode the default serial port settings are: 9600 baud, 8 data bits,
No parity, and 1 stop bit. From Windows, HyperTerminal with VT100
terminal emulation can be used for Console Mode configuration.
N
No ot te e: :
Refer to Chapter 9 for details on Console Mode
Upgrade Mode
In Upgrade Mode firmware can be uploaded from a PC via its serial port to
the ESP904 Port 1, using RS-232. Upgrading also can be via the network
connection, using the ESP Manager software and a virtual COM port mapped
to the ESP904 Port 1.
N
No ot te e: :
Refer to Chapter 8 for details on Upgrade Mode
RS-232 Mode
In RS-232 Mode the currently selected serial port is configured as an RS-232
interface supporting eight RS-232 signal lines plus Signal Ground and is
configured as DTE like a computer. Signals are single ended and referenced
to Ground. To use handshaking, Flow Control must be set to RTS/CTS
during Configuration.
N
No ot te e: :
Refer to Appendix A for RS-232 connection pin-outs.
RS-422 Mode
In RS-422 Mode the currently selected serial port is configured as an RS-422
interface supporting four RS-422 signal channels with full duplex operation
for Receive, Transmit, RTS (Request To Send) and CTS (Clear To Send).
The data lines are differential pairs (A & B) in which the B lines positive
relative to the A lines in the idle (mark) state. Ground provides a common
mode reference. To use handshaking Flow Control must be set to RTS/CTS
during configuration.