B&B Electronics Vlinx Serial Servers ESP901E User manual

Manual Documentation Number: ESP901-902_0508m
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 Pk – Oranmore, Galway, Ireland – Ph [phone] – Fax [phone] – www.bb-europe.com
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Mo od de el ls s: : E ES SP P9 90 01 1, , E ES SP P9 90 01 1E E, , E ES SP P9 90 02 2, , E ES SP P9 90 02 2E E

International Headquarters
B&B Electronics Mfg. Co. Inc.
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Ottawa, IL 61350 USA
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Website: www.bb-elec.com
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European Headquarters
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Phone [phone] -- Fax [phone]
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Sales e-mail: [email protected]
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© B&B Electronics – January 2008

Manual Documentation Number: ESP901-902_0508m
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 Pk – Oranmore, Galway, Ireland – Ph [phone] – Fax [phone] – www.bb-europe.com
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consent. Information in this manual is subject to change without notice, and does not represent a commitment on the part
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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.

ii Manual Documentation Number: ESP901-902_0508m
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.co

Manual Documentation Number: ESP901-902_0508m 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 Pk – Oranmore, Galway, Ireland – Ph [phone] – Fax [phone] – www.bb-europe.com
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Ta ab bl le e o of f C Co on nt te en nt ts s
TABLE OF CONTENTS ...................................................................................I
CHAPTER 1: INTRODUCTION..................................................................... 1
FEATURES......................................................................................................... 2
COMMUNICATION MODES ................................................................................ 3
Direct IP Mode ............................................................................................ 3
Virtual COM Mode ...................................................................................... 3
Paired Mode ................................................................................................ 4
Heart Beat.................................................................................................... 4
SERIAL SERVER QUICK START GUIDE .............................................................. 5
Hardware Setup........................................................................................... 5
Software Installation.................................................................................... 6
Serial Server Configuration......................................................................... 6
Install Virtual COM Ports on PC................................................................. 7
Check Communications ............................................................................... 7
CHAPTER 2: MAKING THE HARDWARE CONNECTIONS .................. 9
PACKAGE CHECKLIST ....................................................................................... 9
ESP901/ESP902 CONNECTIONS,INDICATORS AND RESET SWITCH ................. 9
Indicator Lights.......................................................................................... 10
Ethernet Connector.................................................................................... 10
Power Connector....................................................................................... 10
Reset Button............................................................................................... 10
DIP Switches.............................................................................................. 11
Serial Ports ................................................................................................ 12
SERIAL SERVER/PORT OPERATIONAL MODES ................................................ 12
Default Mode ............................................................................................. 13
Console Mode ............................................................................................ 13
Upgrade Mode........................................................................................... 13
RS-232 Mode.............................................................................................. 13
RS-422 Mode.............................................................................................. 14
RS-485 Mode.............................................................................................. 14
SERIAL SERVER SERIAL PORT CONNECTOR PIN-OUTS .................................... 15
CHAPTER 3: INSTALLING THE VLINX ESP SOFTWARE .................. 17
SOFTWARE INSTALLATION.............................................................................. 17
Automatic Installation................................................................................ 17
Manual Installation.................................................................................... 17
Updating an Existing Installation.............................................................. 19
Opening the ESP Manager ........................................................................ 20

ii Table of Contents Manual Documentation Number: ESP901-902_0508m
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 Pk – Oranmore, Galway, Ireland – Ph [phone] – Fax [phone] – www.bb-europe.com
CHAPTER 4: USING ESP MANAGER........................................................ 21
HARDWARE SETUP ......................................................................................... 21
SOFTWARE SETUP........................................................................................... 22
SOFTWARE OVERVIEW ................................................................................... 23
Menus......................................................................................................... 23
Server Icons Pane...................................................................................... 25
Serial Server / Virtual COM Lists.............................................................. 25
Status Bar................................................................................................... 26
SEARCH FOR SERVERS .................................................................................... 26
CONFIGURE SERVER PROPERTIES ................................................................... 27
CHAPTER 5: CONFIGURING THE SERIAL SERVER PROPERTIES. 31
DESCRIPTION OF THE SERVER PROPERTIES ..................................................... 32
Server Name............................................................................................... 32
Serial Number............................................................................................ 32
Password.................................................................................................... 32
DHCP ........................................................................................................ 32
IP Address.................................................................................................. 33
Netmask...................................................................................................... 34
Gateway..................................................................................................... 34
MAC Address............................................................................................. 34
Version & Date.......................................................................................... 34
Link Status.................................................................................................. 34
Server Serial Port ...................................................................................... 34
Baud Rate................................................................................................... 34
Data/Parity/Stop........................................................................................ 34
Flow Control.............................................................................................. 35
TCP/UDP Protocol.................................................................................... 35
Serial Timeout............................................................................................ 35
TCP Alive Timeout..................................................................................... 36
Connection Mode....................................................................................... 36
Delimiter HEX 1 and Delimiter HEX 2...................................................... 36
Force Transmit........................................................................................... 36
Port Status.................................................................................................. 37
TCP/UDP Port........................................................................................... 37
Serial Port Mode........................................................................................ 37
Connection At ............................................................................................ 38
Max Connection......................................................................................... 38
Remote IP Address..................................................................................... 38
Update/Save............................................................................................... 38
CHAPTER 6: INSTALLING VIRTUAL COM PORTS ............................. 43
VIRTUAL COM PORT INSTALLATION ............................................................. 43
MATCHING THE SERIAL SERVER AND VIRTUAL COM PORT SETTINGS .......... 46

Manual Documentation Number: ESP901-902_0508m Table of Contents iii
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CHAPTER 7: REMOVING VIRTUAL COM PORTS................................ 49
REMOVING THE VIRTUAL COM PORT WITH ESP MANAGER .......................... 49
REMOVING THE VIRTUAL COM PORT USING DEVICE MANAGER ................... 50
CHAPTER 8: UPGRADING THE SERIAL SERVER FIRMWARE........ 53
DOWNLOADING THE FIRMWARE ..................................................................... 53
UPGRADING VIA ESP MANAGER.................................................................... 53
Preparing the Software.............................................................................. 53
Upgrading the Firmware........................................................................... 54
CHAPTER 9: USING CONSOLE MODE.................................................... 55
CONSOLE MODE SETUP .................................................................................. 55
Navigating the Configuration Menus......................................................... 56
Using a Password...................................................................................... 57
CHAPTER 10: USING THE WEB SERVER............................................... 59
SETTING SERVER PROPERTIES ........................................................................ 59
CHAPTER 11: USING TELNET................................................................... 63
CONFIGURATION USING TELNET .................................................................... 63
Navigating the Configuration Menu .......................................................... 64
CHAPTER 12: ESP901 AND ESP902 TECHNICAL DATA...................... 67
APPENDIX A: RS-232 CONNECTIONS...................................................... 71
SERIAL SERVER DB-9 PIN-OUTS IN RS-232 MODE......................................... 71
RS-232 Straight-through Cable Connections............................................. 72
RS-232 Crossover (null modem) Cable Connections................................. 72
RS-232 Straight-through DB-9 to DB-25 Conversion Connections........... 73
RS-232 Crossover DB-9 to DB-25 Conversion Connections..................... 73
RS-232 DTE Loopback Connections.......................................................... 74
APPENDIX B: RS-422 CONNECTIONS...................................................... 75
SERIAL SERVER DB-9 PIN-OUTS IN RS-422 MODE......................................... 75
APPENDIX C: RS-485 CONNECTIONS...................................................... 79
SERIAL SERVER DB-9 PIN-OUT IN RS-485 MODE........................................... 79
APPENDIX D: NETWORK CONNECTIONS............................................. 81
STANDARD ETHERNET CABLE RJ-45 PIN-OUT................................................ 81
CROSSOVER ETHERNET CABLE RJ-45 PIN-OUT .............................................. 82

iv Table of Contents Manual Documentation Number: ESP901-902_0508m
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 Pk – Oranmore, Galway, Ireland – Ph [phone] – Fax [phone] – www.bb-europe.com

Introduction
Manual Documentation Number: ESP901-902_0508m Chapter 1 1
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Ch ha ap pt te er r 1 1: : I IN NT TR RO OD DU UC CT TI IO ON N
VLINX Models ESP901 and ESP902 Ethernet Serial Servers provide
Ethernet to Serial connections for RS-232, RS-422 or RS-485 devices.
The ESP901 features a single serial port and the ESP902 features two
serial ports. 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.
Figure 1. VLINX ESP901 and ESP902 Ethernet Serial Servers

Introduction
2 Chapter 1 Manual Documentation Number: ESP901-902_0508m
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 Pk – Oranmore, Galway, Ireland – Ph [phone] – Fax [phone] – www.bb-europe.com
Features
•Multi-interface serial ports
oESP901 and ESP902 Port 1 software selectable for RS-
232, RS-422, RS-485 (DIP Switch selects Console Mode)
oESP902 Port 2 is RS-232 only
•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/XP/NT 4.0 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 virtual
COM ports, viewable in the Windows Device Manager under
Ports (COM & LPT). Virtual COM port provides access to any of
the ports on the ESP901 and ESP902, 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 Serial Server. 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.

Introduction
Manual Documentation Number: ESP901-902_0508m 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
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Communication Modes
The ESP901 and ESP902 Serial Servers enable 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 Serial Server. In this type of application the Serial Server is
configured as a TCP or UDP server. The socket program running on the
PC establishes a communication connection with the Serial Server.
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
Install Virtual COM Mode allows the user 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 Serial Server.
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 Serial Server, which converts the IP
packet back to serial data and sends the data out a serial port located on
the Serial Server.
To use this mode, the Serial Server 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.

Introduction
4 Chapter 1 Manual Documentation Number: ESP901-902_0508m
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 Pk – Oranmore, Galway, Ireland – Ph [phone] – Fax [phone] – www.bb-europe.com
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 Serial Servers and the LAN.
Two Serial Servers 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
Manual Documentation Number: ESP901-902_0508m 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
B&B Electronics Ltd– Westlink Commercial Pk – Oranmore, Galway, Ireland – Ph [phone] – Fax [phone] – www.bb-europe.com
Serial Server 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
ESP901 or ESP902 Serial Server connected to the RS-232 port of a
serial device.
Hardware Setup
Figure 2. Typical Hardware Setup
Step 1: Connect the Serial Server to the network using a standard
network cable.
Step 2: Connect the Serial Server to the RS-232 port on the 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: Set all the DIP switches to the OFF position.
Step 4: Apply power to the Serial Server.

Introduction
6 Chapter 1 Manual Documentation Number: ESP901-902_0508m
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 Pk – Oranmore, Galway, Ireland – Ph [phone] – Fax [phone] – www.bb-europe.com
Software Installation
Using the CD included with the Serial Server, install the VLINX ESP
Manager software on the configuring computer.
Serial Server 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 desired Serial Server port on the list to bring
up the Server Properties configuration screen.
Figure 3. The Server Properties Window
Step 3: Change the Server Properties as required.
•Enable DHCP to allow the Serial Server to generate its
own IP address
OR
•Obtain appropriate static IP, Netmask and Gateway
addresses from your Network Administrator
(recommended)
•Set the Serial Port Mode property to RS-232 to match the
serial device connected to the Serial Server.
•Set Baud Rate, Data/Parity/Stop, and Flow Control to
match the configuration of the serial device connected to
the Serial Server 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.

Introduction
Manual Documentation Number: ESP901-902_0508m Chapter 1 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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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.
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 a port 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 4. 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 Serial
Server serial port.
Step 4: Communications with the serial device should now be
operational.

Introduction
8 Chapter 1 Manual Documentation Number: ESP901-902_0508m
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 Pk – Oranmore, Galway, Ireland – Ph [phone] – Fax [phone] – www.bb-europe.com

Making Hardware Connections
Manual Documentation Number: ESP901-902_0508m Chapter 2 9
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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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
ESP901 and ESP902 Serial Servers are shipped with the following
items included:
9ESP901 or ESP902 Serial Server Module
9Power supply
9This Operation Manual
9CD-ROM disc with manual, VLINX ESP Manager and Virtual
COM Driver software for Windows 98/ME/2000/2003/XP/NT
4.0/Vista
ESP901/ESP902 Connections, Indicators and
Reset Switch
Connectors, Indicators and Switches:
•Three indicator LEDs
•One Ethernet connector (RJ-45 female)
•A power connector
•A recessed reset switch
•Triple DIP switch
•ESP901: One serial port connector (DB-9M)
•ESP902: Two serial port connectors (DB-9M)

Making Hardware Connections
10 Chapter 2 Manual Documentation Number: ESP901-902_0508m
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 Pk – 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
Figure 5. Indicator Lights
Ethernet Connector
The Serial Server has a standard RJ-45 receptacle mounted in the top
edge of the chassis. The Serial Server 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 three
seconds. The Link and Ready lights will go out and then come back on.
RJ-45
female Reset Power jack 2.5 mm Tip (+)
Off
Figure 6. Top View of ESP901 and ESP902 (when mounted vertically)

Making Hardware Connections
Manual Documentation Number: ESP901-902_0508m Chapter 2 11
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DIP Switches
A triple DIP (dual inline package) switch allows the Serial Server to
be placed into Console Mode. When all three switches are moved into
the ON position the Serial Server enters Console Mode, allowing
configuration of the Serial Server (using an RS-232 connection
through the serial port on the ESP901 or Serial Port 1 on the ESP902)
from a PC running a terminal program such as HyperTerminal. When
the Serial Server enters Console Mode the Console Mode screen will
appear in the HyperTerminal program window. The serial port settings
must be 8-N-1 at 9600 baud.
Figure 7. The Console Mode (Server) Screen in the
HyperTerminal Window
When any of the DIP switches are switched back to the OFF position,
the Serial Server will revert to the mode it was in before Console
Mode.
N
No ot te e: :
The Serial Server can be put into Console mode using either of two
methods:
1. Switching all the DIP switches to the ON position
2. With any DIP switch in the OFF position set the Server
Properties Console Mode field to Console and Update/Save the
configuration

Making Hardware Connections
12 Chapter 2 Manual Documentation Number: ESP901-902_0508m
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 Pk – Oranmore, Galway, Ireland – Ph [phone] – Fax [phone] – www.bb-europe.com
Serial Ports
The ESP901 has one serial port. The port can be configured as a
Console Mode connection or as an RS-232, RS-422 or RS-485
interface to the Serial Server (if any of the DIP switches are in the
OFF position) using the ESP Manager software, via Telnet, or using
the Web Server.
The ESP902 has two serial ports. Port 1 operates the same as the
ESP901 serial port. Port 2 on the ESP902 is an RS-232 only interface.
The RS-232 interfaces are configured as DTEs. The connectors for all
ports are DB-9M.
Serial Port
DB-9 Male
Figure 8. The ESP901 Serial Port Connector
Serial Port 1
DB-9 Male
Serial Port 2
DB-9 Male
Figure 9. The ESP902 Serial Port Connectors
Serial Server/Port Operational Modes
Using the ESP Manager the 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. The server also
can be put into Console Mode by placing all the DIP switches into the
ON position.