B&B Electronics Vlinx Serial Servers ESP902 User manual

Documentation Number: ESP902-2303 Manual Title Page
B&B Electronics Mfg Co Inc– 707 DaytonRd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone]
B&B ElectronicsLtd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph [phone]– Fax [phone]
Dual-Port Multi-Interface
(RS-232/422/485)
Ethernet Serial Server
Model ESP902, ESP902E
Documentation Number: ESP902-2303
International Headquarters
B&B Electronics Mfg. Co. Inc.
707 Dayton Road -- P.O. Box 1040 -- Ottawa, IL 61350 USA
Phone [phone] -- General Fax [phone]
Home Page: www.bb-elec.com
Sales e-mail: [email protected] -- Fax [phone]
Technical Support e-mail: [email protected] -- Fax [phone]
European Headquarters
B&B Electronics Ltd.
Westlink Commercial Park, Oranmore, Co. Galway, Ireland
Phone [phone] -- Fax [phone]
Home Page: www.bb-europe.com
Sales e-mail: [email protected]
Technical Support e-mail: [email protected]
B&B Electronics – May 2003

Documentation Number: ESP902-2303 Manual Table of Contents i
B&B Electronics Mfg Co Inc– 707 DaytonRd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone]
B&B ElectronicsLtd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph [phone]– Fax [phone]
Table of Contents
Chapter 1: INTRODUCTION................................................1
Features ....................................................................................1
Communication Modes............................................................2
Direct IP Mode...........................................................................2
Virtual COM Mode.....................................................................2
Heartbeat...................................................................................3
Quick Start ................................................................................3
Default ESP902 Settings..........................................................4
Specifications...........................................................................5
Protocols...................................................................................5
Indicators ..................................................................................5
Connectors ...............................................................................5
Serial Signals............................................................................5
Power & Environment..............................................................5
Hardware and Included Accessories......................................6
Optional Accessories...............................................................6
Configuration Options .............................................................6
Chapter 2: HARDWARE......................................................7
Ethernet Connection................................................................7
DC –In........................................................................................8
Reset Button.............................................................................8
Mode Switches – ESP Server Port 1.......................................8
RS-485 Mode.............................................................................9
RS-422 Mode.............................................................................9

ii Table of Contents Documentation Number: ESP902-2303 Manual
B&B Electronics Mfg Co Inc– 707 DaytonRd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone]
B&B ElectronicsLtd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph [phone]– Fax [phone]
RS-232 Mode.............................................................................9
Default Setting..........................................................................9
Upgrade Mode.........................................................................10
Console Mode.........................................................................10
Serial Connections.................................................................10
RS-232 Connections...............................................................11
RS-485 Connections...............................................................13
Chapter 3: INSTALL VLINX ESP SOFTWARE.................14
Chapter 4: USING ESP MANAGER ..................................17
Searching LAN for ESP902....................................................17
Firmware Upgrade..................................................................18
Virtual COM Configuration ....................................................18
Searching Server....................................................................18
Uninstall Virtual COM.............................................................18
Server Name ...........................................................................18
IP Address...............................................................................18
Protocol...................................................................................18
COM Name ..............................................................................19
Status ......................................................................................19
Server Properties Screen.......................................................19
Chapter 5: SERVER PROPERTIES CONFIGURATION ...21
Server Name ...........................................................................22
Password ................................................................................22
DHCP .......................................................................................22
IP Address, Netmask, and Gateway Properties...................22
Net Mask..................................................................................23
Gateway...................................................................................23

Documentation Number: ESP902-2303 Manual Table of Contents iii
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MAC Address..........................................................................23
Link Status (Shown in Telnet or Console mode only) ........23
Server Serial Port (Select 1 or 2)...........................................23
Baud Rate (Set for each port)................................................24
Data/Parity/Stop (Set for each port)......................................24
Flow Control (Set for each port)............................................24
Connection Mode (Set for each port) ...................................24
TCP/UDP Protocol (Set for each port)..................................24
TCP/UDP Port (Set for each port)..........................................24
Remote IP Address (Set for each port).................................25
Update .....................................................................................25
Chapter 6: INSTALLING VIRTUAL COM PORT...............27
Use Device Manager to View New Ports ..............................29
Chapter 7: REMOVING A VIRTUAL COM PORT .............31
Removing the Virtual COM port with ESP902 Management
Software ..................................................................................31
Removing the Virtual COM Port using Device Manager.....32
Chapter 8: UPGRADE MODE...........................................34
Using Virtual COM or Serial Connections............................34
Chapter 9: CONSOLE MODE SETUP...............................37
APPENDIX A: LOOPBACK CONNECTIONS..................A-1
APPENDIX B: RS-232 CONNECTIONS ..........................B-1
APPENDIX C: RS-422 CONNECTIONS ..........................C-1
APPENDIX D: RS-485 CONNECTIONS ..........................D-1

Documentation Number: ESP902-2303 Manual Chapter 1 1
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Chapter 1: INTRODUCTION
The VLINX Model ESP902 Dual-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” connection. The 10/100 Mbps Ethernet connection auto-
selects 10BaseT or 100BaseTX and indicates the type of connection with a bi-
color link light.
Features
Dual Serial Ports – One RS-232, One Multi-Interface Selectable
RS-232, RS-422, or RS-485 connections
10/100 Mbps Ethernet with Auto Selection
LAN and WAN Communications
Configurable as TCP or UDP Client or Server
Software Support – Windows 98/ME/2000/XP or NT 4.0
Includes VLINX ESP Manager Software for Windows
Includes Virtual COM Driver Software for Windows
Selectable Heart Beat Connection
Firmware Download for Future Revisions/Upgrades
The Heart Beat Protocol ensures reliable communications in Virtual COM port
mode or with paired connections. This feature restores the connections if
communications are temporarily lost at either end due to loss of power or the
Ethernet connection.
VLINX ESP Manager Software provides easy configuration of Ethernet and
Serial port settings. For configuration, the ESP902 can be attached to your
network or to the Ethernet port of your computer using a crossover cable.
Non-Windows users can configure it in the Console Mode using an RS-232
port, VT100 Terminal Emulation program and RS-232 crossover cable.
HyperTerminal is recommended.
The ESP Virtual COM Driver installs a virtual COM port which is viewable in
the Windows Device Manager under “Ports” (COM & LPT). This virtual COM
port provides access to one of the ports on the ESP902 the same as 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 ESP902. The LAN becomes transparent to
the serial device and the software running on the PC.

2 Chapter 1 Documentation Number: ESP902-2303 Manual
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Communication Modes
The ESP902 enables communication with serial devices over a LAN or WAN.
Serial devices are no longer 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 will allow 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 ESP902.
In this type of application the ESP902 is configured as a TCP or UDP server.
The socket program running on the PC establishes a communication
connection with the ESP902. The data is sent directly to and from the serial
port on the server.
Virtual COM Mode
Use Install Virtual COM to add a driver which provides 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 such Virtual
ports. When a program on the PC opens the new COM port, it connects to the
remote serial device connected to one of the ports on the ESP902.
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 packet, sends it across the network to the
ESP902, which converts the IP packet back to serial data and sends the data
out the serial port.
To use this mode, the ESP902 must be set to either TCP/server or
UDP/server in the menu with a designated communication port number. The
virtual COM driver is the TCP or UDP client.

Documentation Number: ESP902-2303 Manual Chapter 1 3
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Heart Beat
The Heart Beat protocol connection provides a reliable communications
connection in Virtual COM port mode or with paired (tunneling) mode. This
feature restores the connections 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 attention to
correct the problem. 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 5 seconds until communications is established again. The
Heart Beat feature is available for use with the Virtual COM port mode and
Paired Connection mode. This is not available when using a UDP application.
Quick Start
This section lists the steps needed to start using the ESP902.
Please familiarize yourself with the connections, indicators and switches
before beginning. See Hardware Chapter 2.
There are three ways to configure the ESP902 for your network and serial
devices: We recommend the first unless not using a Windows operating
system.
1. Ethernet connection using the VLINX ESP Manager under Windows.
2. Ethernet connection using the Telnet VT100 Terminal software.
3. RS-232 connection in Console mode using VT100 Terminal software.
The ESP902 can be configured on your network or connected directly to the
Ethernet port on your computer using an Ethernet crossover cable. Use the
ESP Manager with Windows or use Telnet for configuration without Windows.
We recommend using the ESP Manager.
With Console configuration, a RS-232 Crossover (null modem DTE/DTE)
cable is usually needed, the ESP902 ports are configured DTE for RS-232.
Set the mode switches to Console mode, (SW 1-ON, SW 2 - ON, SW 3 ON)
before configuration.

4 Chapter 1 Documentation Number: ESP902-2303 Manual
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Step 1: Decide which method to use for configuration and operation.
If using the Console mode for setup, refer to the Console mode
section, Chapter 9, and Chapter 5, then power up the unit.
Step 2: Attach the ESP902 to your network or computer Ethernet port. You
can connect your serial devices now if needed.
If using Telnet for setup, refer to the Console mode section, Chapter
9, and Chapter 5, then power up the unit.
Step 3: Install the VLINX ESP Manger software on the configuring Computer
Step 4: Power on the ESP902 and check the status lights.
Step 5: Start the VLINX ESP Manager from your program menu.
Step 6: Select Search to find the ESP902 on your network.
Step 7: When found, Double-Click the ESP902 to bring up the Server
Properties Configuration Screen. If more than one ESP902 shows up,
select the one that matches the Default IP Address shown on the
bottom of the ESP902. (Initially usually IP:902.168.0.1)
Step 8: Refer to the Server Properties section, Chapter 5 for details on the
Configuration parameters for each field. Configure and Save/Update.
Step 9: If you want to use Virtual COM ports with Windows, install the Virtual
COM Port or Ports on each computer requiring access.
Default ESP902 Settings
Server Name: Vlinx
Serial Number:
Password: Blank
DHCP: Disable
IP Address: 192.168.0.1
Net Mask: 255.255.255.0
Gateway: 192.168.0.254
MAC Address Fixed – see bottom label
Baud Rate: 9600
Data/Parity/Stop: 8-N-1
Flow Control: None
TCP/UDP Ports: TCP Port 1 – 4000, Port 2 - 4001
Connection Mode: Server
Remote IP Address:255.255.255.255

Documentation Number: ESP902-2303 Manual Chapter 1 5
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Specifications
Serial Memory: 8K bytes per port
LAN: 10/100 Mbps Auto-detecting
10 BaseT or 100 BaseTX
Protocols
TCP, IP, ARP, DHCP, Telnet, HTTP, UDP, ICMP
Indicators
Power – Red LED
Link – Yellow or Green (10BaseT or 100 BaseTX)
Ready – Flashing Green
Connectors
Ethernet: single RJ-45 female
Serial: two - 9 pin D-type male (DB9M)
ESP Port 1 is switch selectable as RS-232/422/485
ESP Port 2 is always RS-232
DC: ultra-miniature phone jack (2.5mm), Tip (+), Sleeve (−)
Serial Signals
RS-232(DTE): TXD, RXD, RTS, CTS, DTR, DSR, DCD and GND
RS-422: TXDB(+), TXDA(−), RXDB(+), RXDA(−), RTS(+), RTS(−), CTS(+),
CTS(−) and GND
RS-485: Data B (+), Data A (–) and GND
Baud Rate: 110 bps to 230.4 k bps
Parity: none, even, odd
Data Bits: 7, 8
Stop Bits: 1, 2
Power & Environment
Power Requirements: 12 VDC @ 300 mA
Operating Temperature: 0 to 50 °C (32 to 122 °F)
Storage Temperature: −20 to 60 °C (−4 to 140 °F)
Humidity: 0 – 90% Non-Condensing
Approvals: CE, FCC
Dimensions: 3.35 x 4.5 x 0.90 in (8.5 x 11.5 x 2.3 cm)

6 Chapter 1 Documentation Number: ESP902-2303 Manual
B&B Electronics Mfg Co Inc– 707 DaytonRd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone]
B&B ElectronicsLtd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph [phone]– Fax [phone]
Hardware and Included Accessories
ESP902 Serial Server module
Power Supply: 12VDC/500mA (tip positive/sleeve negative)
Area Dependent: US power plug (120VAC/60Hz) or
Euro or UK power AC plug (220/240VAC/50Hz)
Manual (paper copy of this manual)
CD-ROM disc with software for Windows 98/ME/2000/XP/NT 4.0
- VLINX ESP Manager and Virtual COM Driver software
Optional Accessories
232NM9 Null Modem Crossover Cable for DTE to DTE connections
DRAD35 DIN Rail mounting clips for 35mm DIN Rail
ERS35 one meter length of steel 35mm DIN Rail.
Configuration Options
Console Mode using RS-232 with VT100 emulation
Telnet using VT100 emulation
(software for Console Mode or Telnet not included)
(can use HyperTerminal in Windows)
VLINX ESP Manager using Windows 98/ME/2000/XP and NT
Manager software includes Search for VLINX ESP901/ESP902 on
network, Configure Server Properties, Add/Remove Virtual COM port in
Windows, Firmware download for future revisions.

Documentation Number: ESP902-2303 Manual Chapter 2 7
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Chapter 2: HARDWARE
This section covers indicators, switch settings and connections.
Side View – when vertical mounted
Light Indication
Power Red - Power is applied
Link Yellow – 10 BaseT Ethernet or
Green – 100 BaseTX Ethernet connection established
Ready Flashing Green – system is ready
Ethernet Connection
A straight-through RJ45 (male) Ethernet cable can be used to connect the
serial server to an Ethernet hub, switch, or wall plate. A crossover Ethernet
cable can be used to make a connection directly to the RJ45 Ethernet port on
a PC or laptop.

8 Chapter 2 Documentation Number: ESP902-2303 Manual
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Top View
DC –In
Connect the included power supply here, and then plug the supply in. When
power is applied, the Red power light will illuminate. The tip of the power plug
is positive, sleeve is negative. The standard 12VDC/500mA power supply for
US shipment is 120VAC/60Hz, for Europe or UK it will be 230VAC or
240VAC/50Hz.
Reset Button
Resets the unit similar to removing/applying power. The Reset Button 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 come back on. If you change the Mode Switch settings, you can press
Reset to reboot and read the new settings.
Mode Switches – ESP Server Port 1
Set the switches for the mode desired, then apply or cycle the power.
Mode SW1 SW2 SW3
RS-485 Operation OFF OFF OFF
RS-422 Operation ON OFF OFF
RS-232 Operation OFF ON OFF
Default ON OFF ON
Upgrade Firmware OFF ON ON
Console Menu ON ON ON
Table 2.2 – Mode Switches
The switches set the Multi-Interface serial port to RS-485, RS-422 or RS-232
operation. They also select the Server Console mode for Configuration,
Upgrade mode for new firmware downloading or Default to reset the ESP902
to the original default settings.

Documentation Number: ESP902-2303 Manual Chapter 2 9
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RS-485 Mode
The RS-485 mode supports the Transmit and Receive Channels using 2-wire
half-duplex operation. The data lines are differential with the Data B line
positive relative to Data A in the Mark state. Ground provides a common mode
reference. Refer to the Pin-out table for connections.
Internal Setting To Select RS-485 Bias
You can select RS-485 Receiver Biasing from the ESP902 if your network
doesn’t supply any. Remove the two side cover screws, slide the cover off,
then set the two bias jumpers (shown open) to enable biasing (shorting).
RS-422 Mode
The RS-422 mode supports 4 channels with full duplex operation for Receive,
Transmit, RTS (Request To Send) and CTS (Clear To Send). The data lines
are in differential pairs with the B lines positive relative to the A lines. Ground
provides a common mode reference. To use handshaking Flow Control must
be set to RTS/CTS during configuration. Refer to the Pin-out table for
connections.
RS-232 Mode
The RS-232 supports 8 channels plus Signal Ground and is configured as
DTE like a computer. Signals are single ended and referenced to Ground. To
used handshaking, Flow Control must be set to RTS/CTS during
Configuration. Refer to the Pin-out table for connections.
Default Setting
Use this mode to reset the original factory default settings when powered on.

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Upgrade Mode
You can install newly revised firmware for the ESP902 using RS-232
connections from a PC, through the ESP Manager or through the Virtual COM
port. See Chapter 8 for details.
Console Mode
The Console mode provides access to the configuration menu using RS-232
connections. Connect a null modem crossover cable between the multi-
interface port and one of the computer’s RS-232 serial ports. The ESP902
Serial ports are wired as DTE like a computer using DB9M connectors, so a
crossover cable must be used to connect to another DTE port.
In Console mode the default serial port settings are: 9600 baud, 8 data bits,
No parity, and 1 stop bit. With Windows, you can use HyperTerminal with
VT100 terminal emulation for Console mode configuration. Use the default
settings only if they have not been changed. See Chapter 7 for details.
Bottom View
Serial Connections
RS-232
Signal Name DTE RS-232 DB9M Pin RS-422 RS-485
Carrier Detect In DCD 1 RXDA (−) --
Receive (Rx) Data In RXD 2 RXDB (+) --
Transmit (Tx) Data Out TXD 3 TXDB (+) Data B (+)
DataTerminal
Ready Out DTR 4 TXDA (−) Data A (−)
Signal Ground --- GND 5 GND GND
Data Set Ready In DSR 6 CTSA (−) --
Request To Send Out RTS 7 CTSB (+) --
Clear To Send In CTS 8 RTSB (+) --
Ring Indicator In RI 9 RTSA (−)
Table 2.3 - Serial Connection Pin-outs for RS-232/RS-422/RS-485

Documentation Number: ESP902-2303 Manual Chapter 2 11
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The ESP902 has two DB-9 male connectors.
ESP Port 1 - Multi-interface, dip-switch selectable RS-232, RS-422 or
RS-485.
ESP Port 2 - RS-232 only
.
RS-232 Connections
In the RS-232 mode, the ports are configured as DTE (Data Terminal
Equipment) like a computer. ESP902 to device connections are the same.
When connecting to a PC or another DTE device, use a null modem crossover
cable. When connecting to a DCE device that can normally be plugged into a
PC, use a straight through cable. Set Flow Control to None for 3-wire RS-232.
Refer to Appendix B for DB9 to DB25 Conversion Cables.

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RS-422 Connections
In the RS-422 mode, TXD lines are outputs, RXD lines are inputs. Connect
the TXDB(+) line to the RXDB(+) line of your device, and the TXDA(-) to the
RXDA(-) of your device.
If Flow Control is set for RTS/CTS, connect the RTSB(+) to CTSB(+) of your
device and RTSA(-) to CTSA(-) of your device. Connect from CTSB(+) to
RTSB(+) of your device and from CTSA(-) to RTSB(+) of your device.
If connecting to Receive Only RS-422 devices, connect from TXDB(+) and
TXDA(-) to the receive pairs on all your devices.
Ground is signal ground and provides a common mode reference for the RS-
422 Receiver and Transmitters.
The RS-422 mode can be used for full duplex 4-wire RS-485 operation
provided that the ESP902 is acting as a sole master connecting to all the
slave devices, and all slave devices share the Receive signal lines to the
master. Set Flow Control for none, and omit connections to RTS/CTS line
pairs.

Documentation Number: ESP902-2303 Manual Chapter 2 13
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RS-485 Connections
Some RS-485 devices are marked opposite from the RS-485 standard which
defines the Data B line as positive relative to Data A during a Mark state
before enabling the transmitter, and after transmitting before tri-stating. If the
RS-485 devices don’t respond, try swapping the Data B and Data A lines.
If you want to connect 4-Wire RS-485 devices, you can use the RS-422 Mode
provided that the ESP902 will be connected as a Master in a single master
system. If you have multiple masters, you cannot use this device, it does not
tri-state the transmitter in RS-422 mode.

14 Chapter 3 Documentation Number: ESP902-2303 Manual
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Chapter 3: INSTALL VLINX ESP SOFTWARE
The Windows based ESP Manager and Virtual COM port software makes
configuration fast and easy. We recommend installing the Software to
configure the ESP902 unless you are not using Windows.
To install the ESP Manager, Install Virtual Com, Uninstall Virtual COM
programs:
Inserting the VLINX CD in the CD-ROM will automatically launch the Install
Shield Wizard.
To manually start the software installation, select the Start button on the
desktop. At the Run command line type D:start.exe Then select OK. The D: is
the drive letter for the CD Rom.
The Install Shield Wizard window will be displayed.
When the VLINX ESP Setup window appears, Click Next.

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When Choose Destination Location appears, Click Next.
The installation progress will be shown until complete.

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Select Finish when the Install Shield Wizard Complete appears.
After Finish, the Install window closes.
You can now start the ESP Manager software, use Start, Programs. B&B
Electronics. VLINX ESP Servers, VLINX ESP Manager.
If you have not already connected the ESP902 to your network or to the
Ethernet port on your computer, connect it, then apply power.
The Power indicator should light Red, the Link light should indicate which type
of Ethernet connection has been made; and the Ready LED will flash
indicating that you can begin configuration.