Black Box Server LES431A User Manual

LES431A  
Modbus Hardened Serial Server  
Connect Modbus networks (RS-232, RS-422,  
or RS-485) to Ethernet networks, allowing  
the Modbus network to become a node  
on the network.  
Access the Modbus network over a LAN/WAN using direct IP mode  
connections.  
Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500)  
Customer  
Support  
Information  
FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746  
Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018  
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FCC and IC RFI Statements  
Federal Communications Commission and Industry Canada Radio Frequency Interference  
Statements  
This equipment generates, uses, and can radiate radio-frequency energy, and if not installed and used properly, that is, in strict  
accordance with the manufacturer’s instructions, may cause interference to radio communication. It has been tested and found  
to comply with the limits for a Class A computing device in accordance with the specifications in Subpart B of Part 15 of FCC  
rules, which are designed to provide reasonable protection against such interference when the equipment is operated in a  
commercial environment. Operation of this equipment in a residential area is likely to cause interference, in which case the user  
at his own expense will be required to take whatever measures may be necessary to correct the interference.  
Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to  
operate the equipment.  
This digital apparatus does not exceed the Class A limits for radio noise emission from digital apparatus set out in the Radio  
Interference Regulation of Industry Canada.  
Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables aux appareils numériques  
de la classe A prescrites dans le Règlement sur le brouillage radioélectrique publié par Industrie Canada.  
WARNING: EXPLOSION HAZARD—DO NOT DISCONNECT EQUIPMENT WHILE THE CIRCUIT IS LIVE OR UNLESS THE AREA IS  
KNOWN TO BE FREE OF IGNITABLE CONCENTRATIONS.  
SUITABLE FOR USE IN CLASS I, DIVISION 2, GROUPS A, B, C AND D HAZARDOUS LOCATIONS, OR NONHAZARDOUS  
LOCATIONS ONLY.  
WARNING: EXPLOSION HAZARD—SUBSTITUTION OF ANY COMPONENT MAY IMPAIR SUITABILITY FOR CLASS I, DIVISION 2.  
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NOM Statement  
Instrucciones de Seguridad  
(Normas Oficiales Mexicanas Electrical Safety Statement)  
1. Todas las instrucciones de seguridad y operación deberán ser leídas antes de que el aparato eléctrico sea operado.  
2. Las instrucciones de seguridad y operación deberán ser guardadas para referencia futura.  
3. Todas las advertencias en el aparato eléctrico y en sus instrucciones de operación deben ser respetadas.  
4. Todas las instrucciones de operación y uso deben ser seguidas.  
5. El aparato eléctrico no deberá ser usado cerca del agua—por ejemplo, cerca de la tina de baño, lavabo, sótano mojado o cerca  
de una alberca, etc.  
6. El aparato eléctrico debe ser usado únicamente con carritos o pedestales que sean recomendados por el fabricante.  
7. El aparato eléctrico debe ser montado a la pared o al techo sólo como sea recomendado por el fabricante.  
8. Servicio—El usuario no debe intentar dar servicio al equipo eléctrico más allá a lo descrito en las instrucciones de operación.  
Todo otro servicio deberá ser referido a personal de servicio calificado.  
9. El aparato eléctrico debe ser situado de tal manera que su posición no interfiera su uso. La colocación del aparato eléctrico  
sobre una cama, sofá, alfombra o superficie similar puede bloquea la ventilación, no se debe colocar en libreros o gabinetes  
que impidan el flujo de aire por los orificios de ventilación.  
10. El equipo eléctrico deber ser situado fuera del alcance de fuentes de calor como radiadores, registros de calor, estufas u otros  
aparatos (incluyendo amplificadores) que producen calor.  
11. El aparato eléctrico deberá ser connectado a una fuente de poder sólo del tipo descrito en el instructivo de operación, o como  
se indique en el aparato.  
12. Precaución debe ser tomada de tal manera que la tierra fisica y la polarización del equipo no sea eliminada.  
13. Los cables de la fuente de poder deben ser guiados de tal manera que no sean pisados ni pellizcados por objetos colocados  
sobre o contra ellos, poniendo particular atención a los contactos y receptáculos donde salen del aparato.  
14. El equipo eléctrico debe ser limpiado únicamente de acuerdo a las recomendaciones del fabricante.  
15. En caso de existir, una antena externa deberá ser localizada lejos de las lineas de energia.  
16. El cable de corriente deberá ser desconectado del cuando el equipo no sea usado por un largo periodo de tiempo.  
17. Cuidado debe ser tomado de tal manera que objectos liquidos no sean derramados sobre la cubierta u orificios de ventilación.  
18. Servicio por personal calificado deberá ser provisto cuando:  
A: El cable de poder o el contacto ha sido dañado; u  
B: Objectos han caído o líquido ha sido derramado dentro del aparato; o  
C: El aparato ha sido expuesto a la lluvia; o  
D: El aparato parece no operar normalmente o muestra un cambio en su desempeño; o  
E: El aparato ha sido tirado o su cubierta ha sido dañada.  
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Table of Contents  
Table of Contents  
1. Specifications.........................................................................................................................................................................6  
2. Overview...............................................................................................................................................................................9  
2.1 Introduction...................................................................................................................................................................9  
2.2 Features.........................................................................................................................................................................9  
2.3 What’s Included ............................................................................................................................................................9  
2.4 Hardware Description..................................................................................................................................................10  
2.5 Modbus Hardened Serial Server Configuration Software............................................................................................ 11  
3. Installation and Initial Setup.................................................................................................................................................12  
3.1 Connecting the Power Supply.....................................................................................................................................12  
3.2 Connecting Modbus Hardened Serial Servers to Modbus Networks...........................................................................12  
3.2.1 RS-232................................................................................................................................................................12  
3.2.2 RS-422...............................................................................................................................................................12  
3.2.3 RS-485............................................................................................................................................................... 12  
3.3 Connecting Modbus Hardened Serial Servers to a Network .......................................................................................13  
3.4 Modbus Hardened Serial Server Configuration Connections.......................................................................................13  
3.4.1 Installing Modbus Hardened Serial Server Software...........................................................................................14  
3.4.2 Configuring the Modbus Hardened Serial Server via the Network Connection ................................................. 17  
3.4.3 Configuring the Modbus Hardened Serial Server on Networks Without a DHCP Server ...................................33  
3.4.4 Configuring the Modbus Hardened Serial Server via the Serial Port...................................................................35  
3.5 LES431A Modbus Hardened Serial Server Operational Connections ...........................................................................37  
3.6 Initiating a Hardware Reset on the Modbus Hardened Serial Server ...........................................................................37  
3.7 Reloading Factory Defaults..........................................................................................................................................37  
4. Upgrading the Modbus Hardened Serial Server Firmware...................................................................................................38  
4.1 Downloading Firmware Files........................................................................................................................................38  
4.2 Uploading the Firmware to the Modbus Hardened Serial Server..........................................................................................39  
5. Diagnostics..........................................................................................................................................................................40  
6. Application Examples ..........................................................................................................................................................42  
6.1 Ethernet Master and Serial Slaves................................................................................................................................42  
6.2 Serial and Ethernet Masters, Serial and Ethernet Slaves...............................................................................................47  
6.3 Serial Masters, IP Slaves...............................................................................................................................................49  
6.4 Identical Hard-Coded Slaves........................................................................................................................................ 51  
6.5 Identical Production Lines............................................................................................................................................ 51  
7. Modbus Help.......................................................................................................................................................................52  
7.1 Modbus ASCII/RTU Basics...........................................................................................................................................52  
7.2 Hints and Tips..............................................................................................................................................................52  
Appendix A. Default Modbus Hardened Serial Server Settings.................................................................................................53  
Appendix B. Connector Pinouts................................................................................................................................................54  
B.1 DB9 M Connector.......................................................................................................................................................54  
B.2 Terminal Block .............................................................................................................................................................54  
B.3 Standard Ethernet Cable RJ-45 Pinout .......................................................................................................................55  
Appendix C. Glossary................................................................................................................................................................56  
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Chapter 1: Specifications  
1. Specifications  
General Specifications  
FCC Part 15, Class A, CE, NEMA TS2, UL® Class 1, Division 2, Groups A, B, C, and D  
Approvals  
Compatible  
Operating Systems  
Windows® XP (32/64 bit), 2003 Server (32/64 bit), Windows Vista® (32/64 bit),  
2008 Server (32/64 bit), Windows 7 (32/64 bit)  
Configuration  
Options  
Via serial port using Modbus Hardened Serial Server Software, via network using Modbus Hardened Serial  
Server Software with an Ethernet connection or a standard Web browser such as Internet Explorer® 7, 8, or 9,  
or Firefox® 3 or 4  
Enclosure  
Rating: IP30;  
Mounting: DIN rail mount (35 mm)  
User Controls  
Connectors  
Indicators  
(1) Reset button  
(1) DB9 M, (1) 5-pin terminal block, (1) RJ-45, (1) 2-position pluggable terminal block for power  
(3) LEDs: (1) Ready, (1) Serial, (1) Ethernet Link  
Temperature  
Tolerance  
Operating: -40 to +176° F (-40 to +80° C);  
Storage: -40 to +185° F (-40 to +85° C);  
Maximum Ambient Surrounding Air Temperature: 176° F (80° C)  
Operating  
Humidity  
10 to 95%, noncondensing  
Power  
Voltage requirements: 10 to 48 VDC (58 VDC max.) extermal power supply;  
Consumption: 4.0 watts maximum;  
Terminal blocks: Wire size: 28 to 16 AWG,  
Wire Type: Copper wire only,  
Tightening Torque: 5 kg-cm,  
Wire Temperature Rating: 105° C minimum, sized for 60° C ampacity  
NOTE: One conductor per terminal.  
Dimensions  
1.2"H x 3.3"W x 4.7"D (4.6 x 12.2 x 17.1 cm)  
Serial Interface Specifications  
Baud Rates  
75, 150, 300, 600, 1200, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 38400, 57600, 115200, 230400  
Data Bits  
5, 6, 7, 8  
Flow Control  
Mode Selection  
Parity  
None, RTS/CTS, X-ON/X-OFF  
RS-232/422/485 software-selectable  
None, even, odd, mark, space  
TXD, RXD, RTS, CTS, DTR, DSR, DCD, GND  
TXDA(-), TXDB(+), RXDA(-), RXDB (+), GND  
Data(-), Data(+), GND  
RS-232 Lines  
RS-422 Lines  
RS-485 (2-Wire)  
RS-485 (4-Wire)  
TXDA(-), TXDB(+), RXDA(-), RXDB (+), GND  
RS-422/485 Biasing Auto 4.7 K-ohm pullups and pulldowns  
RS-422/485  
Termination  
Auto termination with through hole (user supplied)  
RS-485 Data  
Control  
Auto control via MCU  
1, 1.5, 2  
Stop Bits  
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Chapter 1: Specifications  
Network Specifications  
Character Count  
0 to 65535  
Connection Modes Server, Client  
Memory Serial: 8 KB per port;  
Network memory: 4 KB  
Firmware Upgrade Via serial, Ethernet, or auto Web search  
IP Port Addresses  
5300: heartbeat and configuration setting in TCP mode;  
8888: LES431A update  
Network  
LAN: 10-/100-Mbps auto-detecting 10BASE-T and 100BASE-TX  
Communications  
Network Physical  
Layer Standards  
Ethernet: IEEE 802.3 autodetecting and auto MDI/MDI-X 10BASE-T and 100BASE-TX  
Protocols  
Supported  
TCP, IPv4, UDP, ARP, HTTP 1.0, ICMP/PING, DHCP/BOOTP;  
IP mode: Static, DHCP, or Auto IP;  
TCP: User-definable  
Search  
Serial direct COM and Ethernet autosearch or specific IP  
Timeouts  
Character: 0 to 65535 ms. default set at 10 ms;  
Modbus Message: 0 to 65535 ms, default set at 1000 ms;  
Serial: 0 to 65535 sec.  
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Chapter 1: Specifications  
Dimensional Diagrams  
Figure 1-1. Dimensional diagram of a LES431A Modbus Hardened Serial Server.  
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Chapter 2: Overview  
2. Overview  
2.1 Introduction  
The 1-Port Modbus Hardened Serial Server connects Modbus networks (RS-232, RS-422, or RS-485) to Ethernet networks,  
allowing the Modbus network to become a node on the network. The serial port can be accessed over a LAN/WAN using Direct  
IP Mode connections. Modbus Hardened Serial Servers use 10BASE-T or 100BASE-TX copper network media. The servers are built  
for use in industrial environments and feature an IP30 approved slim-line DIN-rail-mountable case. The product operates from a  
range of DC power supply voltages and features pluggable terminal block power connectors. The Modbus Hardened Serial Server  
has one Ethernet port.  
Table 2-1. LES431A details.  
Part Number  
Serial Ports  
Serial Connectors  
Ethernet Media Ethernet Connector Power  
(1) DB9M and (1) 5-pin terminal block  
NOTE: Use either the DB9 or the terminal  
block connector, but not both at  
the same time.  
LES431A  
1
RJ-45  
RJ-45  
(1) 3-wire terminal block  
2.2 Features  
• Single Ethernet connector.  
• Multi-interface serial port (RS-232, RS-422, RS-485).  
• DB9M and pluggable terminal block serial port connector options.  
• All serial ports are software selectable for RS-232, RS-422, or RS-485 2- and 4-wire communication.  
• Configuration can be done via network or direct serial connection.  
• Slim-line DIN rail or panel mountable.  
• Accepts DC power over a wide voltage range.  
• Supports 10-/100-Mbps Ethernet with auto-selection and auto MDI/MDI-X.  
• LAN and WAN communications.  
• Configurable for TCP Client or Server operation.  
• Upload firmware over the Ethernet port for future revisions/upgrades.  
• Supports Windows® XP (32/64 bit), 2003 Server (32/64 bit), Vista (32/64 bit), 2008 Server (32/64 bit),  
Windows 7 (32/64 bit).  
• Configure Ethernet and serial port settings using Modbus Hardened Serial Server Software.  
2.3 What‘s Included  
Your package should include the following items. If anything is missing or damaged, contact Black Box Technical Support  
at 724-746-5500 or [email protected].  
• 1-Port Modbus Hardened Serial Server module (LES431A).  
A printed quick start guide.  
Web site (www.blackbox.com) and enter LES431A in the search bar.  
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Chapter 2: Overview  
2.4 Hardware Description  
1-Port Modbus Hardened Serial Server (LES431A)  
Figures 2-1 and 2-2 show the front, back, and top panels of the LES431A. Table 2-2 describes its components.  
4
7
6
5
1
2
3
Figure 2-1. LES431A front and back panels.  
4
8
Figure 2-2. LES431A top panel.  
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Chapter 2: Overview  
Table 2-2. LES431A components.  
Number in Figure  
2-1 or 2-2  
Component  
Description  
1
2
3
4
(1) RJ-45 connector  
Connects a standard Ethernet network drop using a straight-through RJ-45 male Ethernet cable.  
(1) 5-position terminal block connector Connects to an RS-422 or RS-485 serial device when the DB9 M (RS-232) connector is disabled.  
(1) DB9 male connector  
Connects to an RS-232 serial device when the 5-position terminal block (RS-422/RS-485) is disabled.  
Removable 2-position terminal block with +, -, and chassis ground connections.  
(1) 2-wire terminal block connector  
Flashes green when data is being transmitted or received on the serial port.  
Lights steady green when the serial port is open.  
5
6
(1) Serial Port LED  
Lights when a connection to the network is made.  
Blinking when there is data traffic on the Ethernet link.  
(1) Ethernet Link LED  
Blinks once per second when the system is operating correctly.  
7
8
(1) Ready LED  
Blinks three times per second in reset, configuration mode, or when loading factory defaults.  
Off or steady On when the system is not operating correctly.  
(1) Reset mode switch  
Used to initiate a hardware reset, enter console mode, or reload factory defaults.  
2.5 Modbus Hardened Serial Server Configuration Software  
Modbus Hardened Serial Server configuration software enables you to find connected Modbus Hardened Serial Servers, configure  
them, upgrade Modbus Hardened Serial Server firmware, and save/load configuration files. Its graphical user interface (GUI) is  
convenient and easy to use.  
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Chapter 3: Installation and Initial Setup  
3. Installation and Initial Setup  
NOTE: In this section, devices to be connected to the Modbus Hardened Serial Server’s serial connections are simply referred to as  
the “Modbus network.”  
3.1 Connecting the Power Supply  
Connect a DC power supply to the power terminals on the side of the Modbus Hardened Serial Server. Polarity of the wires is  
indicated on the label on the side of the Modbus Hardened Serial Server. Acceptable voltages are between 10 VDC and 58 VDC.  
The power supply must be capable of supplying 4 watts to the LES431A.  
2-wire terminal  
block connector  
Figure 3-1. LES431A power supply connections.  
3.2 Connecting Modbus Hardened Serial Servers to Modbus Networks  
The Modbus Hardened Serial Servers can be connected to Modbus networks using RS-232, RS-422, RS-485 2-wire, or RS-485  
4-wire. The LES431A uses either (1) DB9 M connector or (1) 5-position terminal strip.  
3.2.1 RS-232  
RS-232 connections support eight signal lines plus Signal Ground. Signals are single-ended and referenced to Ground. Default  
communication parameters are 9600, 8, N, 1, and no flow control implemented.  
3.2.2 RS-422  
RS-422 connections support two signal pairs: TDA (-), TDB (+), RDA (-), RDB (+), and GND. The data lines are differential pairs  
(A and B) in which the B line is positive relative to the A line in the idle (mark) state. In RS-422, the transmitter is always enabled.  
Signal Ground provides a common mode reference.  
3.2.3 RS-485  
RS-485 connections support 2-wire or 4-wire operation.  
When configured for 4-wire operation, the connection supports two signal pairs: TDA (-), TDB (+), RDA (-), RDB (+), and GND.  
This makes full-duplex operation possible. The data lines are differential pairs (A and B) in which the B line is positive relative to  
the A line in the idle (mark) state. Signal Ground provides a common mode reference.  
When configured for 2-wire operation, the connection supports one signal pair: Data A (-) and Data B (+). These lines transmit  
and receive signals using half-duplex operation. The data lines are differential with the Data B line positive relative to Data A in the  
idle (mark) state. Signal Ground provides a common mode reference.  
Connecting the Modbus Hardened Serial Server  
The LES431A has one serial connection that supports RS-232, RS-422, and RS-485 (2- and 4-wire). The unit has two connectors:  
a DB9 male connector and a 5-position terminal block.  
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Chapter 3: Installation and Initial Setup  
If you select RS-232 mode when you configure the Modbus Hardened Serial Server, you must connect the Modbus serial network  
to the Modbus Hardened Serial Server via a serial cable. The LES431A is a DTE. If the Modbus network is a DTE, use a null-  
modem (crossover) cable. If the Modbus network is a DCE, use a straight-through cable. DTE and DCE ports are complementary;  
the output signals on a DTE port are inputs to a DCE port, and output signals on a DCE port are inputs to a DTE port. The signal  
names match each other and connect pin-for-pin. Signal flow is in the direction of the arrows (see Table 3-1, below).  
Table 3-1. DTE to DCE Connections.  
DTE Device (Computer) DB9  
Pin # RS-232 Signal Names  
DCE Device (Modem) DB9  
Signal Direction  
Pin #  
RS-232 Signal Names  
1
2
3
4
5
6
7
8
9
Carrier Detect (CDA)  
Receive Data (RX)  
Transmit Data (TX)  
Data Terminal Ready (DTR)  
Signal Ground (SG)  
Data Set Ready (DSR)  
Request to Send (RTS)  
Clear to Send (CTS)  
Ring Indicator (RI)  
<----------------------------  
<----------------------------  
---------------------------->  
---------------------------->  
-----------------------------  
<----------------------------  
---------------------------->  
<----------------------------  
<----------------------------  
1
2
3
4
5
6
7
8
9
Carrier Detect (CD)  
Receive Data (RX)  
Transmit Data (TX)  
Data Terminal Ready (DTR)  
Signal Ground (SG)  
Data Set Ready (DSR)  
Request to Send (RTS)  
Clear to Send (CTS)  
Ring Indicator (RI)  
Soldered to DB9 metal—Shield (FGND) -----------------------------  
Soldered to DB9 metal—Shield (FGND)  
If you select RS-422 mode, RS-485 2-wire mode, or RS-485 4-wire mode when you configure the Modbus Hardened Serial  
Server, you must connect the Modbus network appropriately, via the 5-position terminal block.  
NOTE: Refer to Appendix B for connector pinout information.  
Network  
RS-232 serial cable  
Modbus  
Hardened Serial  
RS-422/485 cable  
Server (LES431A)  
Serial device  
PC  
Figure 3-2. LES431A connections.  
3.3 Connecting Modbus Hardened Serial Servers to a Network  
When connecting a Modbus Hardened Serial Server equipped with a 10BASE-T/100BASE-TX network connection (RJ-45  
connector) to an Ethernet network drop, use a standard unshielded twisted-pair cable. PCs configuring and/or communicating  
with the Modbus Hardened Serial Server are also connected to the network.  
3.4 Modbus Hardened Serial Server Configuration Connections  
The Modbus Hardened Serial Servers can be configured using three methods:  
• Via the network using Modbus Hardened Serial Server Software.  
• Via the network using a Web browser.  
• Via a serial port using Modbus Hardened Serial Server Software (Console Mode).  
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Chapter 3: Installation and Initial Setup  
3.4.1 Installing Modbus Hardened Serial Server Configuration Software  
The file name is Modbus Hardened Serial Server Manager Vx.x.x.  
a. The following screen will be displayed on your computer.  
Figure 3-3. Modbus Hardened Serial Server Manager Installation Welcome screen.  
b. Click “Next.” The License Agreement Screen will be displayed on your computer.  
Figure 3-4. Modbus License Acceptance Screen.  
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Chapter 3: Installation and Initial Setup  
c. Click “Next.” The User Information Screen will be displayed on your computer. Enter your name and organization (optional) and  
select if the software will be accessible to your account or anyone who uses the computer.  
Figure 3-5. User information screen.  
d. Click “Next.” The Destination Folder Screen will be displayed on your computer. The default directory is:  
C:\Program Files\Black Box\Modbus Hardened Serial Server\  
If desired, you can select another location by pressing the “Browse” button.  
Figure 3-6. Destination folder screen.  
e. Click “Next.” The Ready to Install Application Screen will be displayed on your computer. You can select the “Back” button to  
change the destination folder.  
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Chapter 3: Installation and Initial Setup  
Figure 3-7. Ready to Install Application screen.  
f. Click “Next.” The software will begin installing.  
Figure 3-8. Software Installing screen.  
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Chapter 3: Installation and Initial Setup  
g. After the installation is complete, an information screen will be displayed containing contact information and release notes.  
Click “Next.”  
Figure 3-9. Information screen.  
h. The Installation Complete screen will be displayed on your computer. Click “Finish” to finish the installation.  
Figure 3-10. Installation Complete screen.  
3.4.2 Configuring the Modbus Hardened Serial Server via the Network Connection  
To configure via the network, you can use either Modbus Configuration software or the Web interface.  
Configuring with Modbus Configuration Manager  
LES431A Modbus Hardened Serial Servers can be configured over the network Modbus Configuration manager software running  
on a PC.  
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Chapter 3: Installation and Initial Setup  
To open Modbus Hardened Serial Server Configuration Manager:  
1. From the Desktop, click Start—>Programs—>Modbus Hardened Serial Server Manager. An alternate method is to double-click  
the shortcut installed on the desktop.  
Figure 3-11. Opening Modbus Hardened Serial Server Configuration Manager.  
Figure 3-12. Modbus Hardened Serial Server Configuration Manager Shortcut Icon.  
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Chapter 3: Installation and Initial Setup  
2. The Modbus Hardened Serial Server Configuration Manager Device Discovery window appears.  
Figure 3-13. Modbus Hardened Serial Server Configuration Manager Discovery window.  
3. If you do not know the IP address, check the “Network” and “I don’t know the IP address of this device” selections and press  
the “Connect Button.” The software will discover any LES431A Gateways on the network. The configuration manager screen  
will be displayed on your computer. All available devices will be listed on the top portion of this screen. If you know the IP  
address, you may select “The device is at this IP address” and input the address in the box provided.  
Figure 3-14. Modbus Hardened Serial Server Configuration Manager screen.  
4. All Modbus Hardened Serial Servers on the network will be displayed in the top portion of the screen. To select a gateway,  
simply click the appropriate device on the top portion of the screen.  
a. The main portion of the screen displays the model, firmware version, hardware version, MAC address, and link status. The IP  
address is also displayed on the top portion of the screen and title graphic area.  
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Chapter 3: Installation and Initial Setup  
5. The default password is no password. Click the “Login” button. The “General” Settings screen will be displayed on your  
computer.  
6. See the Modbus Hardened Serial Server Manager Settings Screen Overview in Figure 3-15.  
Figure 3-15. Settings Screen Overview.  
A. This area shows Modbus Hardened Serial Servers available on the network.  
B. This area is used to skip directly to the specific configuration screen you need to access. An alternate method of accessing the  
configuration screens is to use the “Next” button in area C.  
C. This area contains dialog boxes specific to the configuration screen.  
NOTE: Save any configuration changes you make using the “Save” button.  
D. This area contains helpful information about the configuration screen you are currently on.  
E. This area contains shortcuts to specific functions.  
1. “Open” allows you to load a previously saved configuration file into your Modbus Hardened Serial Server.  
2. “Save” allows you to save your configuration to a file. This should not be confused with the “Save” button described  
in 6.C above.  
3. “Search” allows you to search for Modbus Hardened Serial Servers on the network.  
4. “Upgrade” allows you to upgrade your Modbus Hardened Serial Server’s firmware.  
5. “Diagnostic” allows you to test a configured Modbus Hardened Serial Server.  
6. “Monitor” allows you to monitor a Modbus Hardened Serial Server.  
7. “About” contains information about your Modbus Hardened Serial Server.  
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7. See the General Settings screen in Figure 3-16.  
Figure 3-16. General Settings screen.  
a. This screen enables you to assign a unique name to the gateway. This allows you to easily identify a particular gateway when  
multiple devices are used on the same network. To change the name, type a new name in the “The Name of this Modbus  
Hardened Serial Server is” box. The name must be a valid "hostname" as defined by RFC-952 and RFC-1123. Allowed  
characters are A to Z, a to z, 0 to 9 and “-. The “-“ symbol cannot be the first or last character. The name cannot consist of  
numbers only. To save the new name, click the “Save” button.  
b. You can also change the gateway’s password on this screen. To do this, check the “I want to change the password” box. New  
password entry boxes will appear on the screen.  
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Chapter 3: Installation and Initial Setup  
Figure 3-17. Changing the password.  
c. Type your new password in the “Type the new password box.” Verify the password by typing it again in the box provided. To  
save the new password, click the “Save” button.  
d. Password is the password assigned to the Modbus Hardened Serial Server. Valid value range is from A” to “Z,” “a” to “z,”  
“0” to ”9.”  
e. Password Confirmation is the password entered a second time to confirm that it was entered correctly. Valid value range is  
from A” to “Z,” “a” to “z,” “0” to “9.”  
8. See the Network Settings screen in Figure 3-18.  
a. To get to the Network Settings Screen, you can either click the “Next” button or click on the “Network” link on the left side of  
the screen.  
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Figure 3-18. Network Setttings screen (DHCP selected).  
NOTE: To see the rest of the information for Class D listed below that is cut off in Figure 3-18, scroll down in the screen.  
b. The default network configuration is to receive an IP address assignment from a DHCP server. DHCP controls whether or not a  
DHCP server is used to set the IP address, subnet mask, and default gateway of the Modbus Hardened Serial Server. When the  
DHCP option is enabled but the DHCP server is not found, the Modbus Hardened Serial Server will automatically configure IP  
address 169.254.102.39 with a subnet mask 255.255.0.0.  
c. To configure your Modbus Hardened Serial Server without using a DHCP Server, uncheck the “I want DHCP to setup the  
network” box. You will need to know the IP Address, Subnet Mask, and Default Gateway.  
The IP Address field contains the static internet protocol address of the Modbus Hardened Serial Server.  
Subnet Mask field contains the mask that is used to define the sub-network.  
For a Class A network (IP addresses 0.0.0.0 through 127.255.255.255), the default subnet mask is 255.0.0.0.  
For a Class B network (IP addresses 128.0.0.0 through 191.255.255.255), the default subnet mask is 255.255.0.0.  
For a Class C network (IP addresses 192.0.0.0 through 223.255.255.255), the default subnet mask is 255.255.255.0.  
For a Class D network (IP addresses 224.0.0.0 through 239.255.255.255) and a Class E network (IP addresses 240.0.0.0 through  
255.255.255.255), the subnet mask is ignored.  
The Default Gateway field contains default route to remote networks.  
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Figure 3-19. Network Settings screen (DHCP not selected).  
d. More information about assigning an IP address without using a DHCP Server is contained in the section “Configuring the  
Modbus Hardened Serial Server on Networks without a DHCP Server.”  
e. Save changes by clicking the “Save” button.  
9. See the Modbus TCP Settings screen in Figure 3-20.  
a. To access this screen, click the “Next Button” or click on the Modbus TCP link on the left side of the screen.  
b. This screen allows you to see Modbus TCP client and server settings.  
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Figure 3-20. Modbus TCP Settings screen.  
c. TCP Client Settings:  
1. “Connect to Port” identifies the TCP port to be used by the Modbus Hardened Serial Server in TCP client mode. Valid value  
range is from 1 to 65535.  
2. “Response Timeout” is the maximum amount of time to wait for a response to a request that is sent to the device connected  
through TCP. Valid value range is from 1 to 65535.  
3. Save settings by clicking the “Save” button.  
b. TCP Server Settings:  
1. “Listen on Port” identifies the TCP port to be used by the Modbus Hardened Serial Server in TCP server mode. Valid value  
range is from 1 to 65535.  
2. “Limit the number of connections to” pull-down box allows you to control the number of simultaneous TCP clients that can be  
connected. Choices are 1 through 16.  
3. “Connection Filter Mode” controls which TCP clients are able to connect. The default is: “and allow everyone to connect.”  
a. You can select “and allow specific IP addresses to connect.” This filter is limited to 4 IP addresses.  
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Figure 3-21. TCP Connection Filter “Allow Specific IP addresses to Connect.”  
b. You can select “and allow a specific range of IP addresses to connect.” This filter is limited to 4 IP address ranges.  
c. Save settings by clicking the “Save” button.  
Figure 3-22. TCP Connection Filter “and Allow Specific Range of IP Addresses to Connect.”  
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10. See the PORT x Serial Settings screen in Figure 3-23.  
a. To access this screen, click the “Next” button or click the Port X Serial link on the left side of the screen. X = The Serial Port  
number (1 or 2).  
b. This screen allows you to change the serial port settings.  
Figure 3-23. Serial Port screen.  
c. “Description” sets the description for this serial port. The maximum length is 32 symbols. Allowed characters are symbols from  
“A” to “Z,” from “a” to “z,” numbers from “0” to “9,” and the space character.  
d. “Mode” controls the physical communications mode for the server. The Mode can be RS-232, RS-422 (4-Wire), RS-485  
(2-Wire), or RS-485 (4-Wire).  
e. “Baud Rate” controls the communications speed of the serial port. The Baud Rate can be 2400, 7200, 9600, 14400, 19200,  
14400, 28800, 38400, 57600, 115200, or 230400.  
f. “Stop Bits” controls the number of bits to end a character. Choices are 1 or 2.  
g. “Parity” controls the error checking mode. Choices are “Odd,” “Even,” “Mark,” or “Space.”  
h. Save settings by clicking the “Save” button.  
11. See the Port X Modbus screen.  
a. To access this screen, click the “Next” button or click the “Port X Modbus” Link on the left side of the screen. X = The Serial  
Port Number (1 or 2).  
b. This screen allows you to change the Modbus settings for the port.  
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Figure 3-24. Modbus Port screen.  
c. “Attached”—This is selectable between Master and Slaves. If “Master” is selected, the Modbus Hardened Serial Server will run  
in TCP server mode, if “Slaves” is selected, it will run in TCP client mode.  
d. “Modbus” indicates the protocol of the device connected to the port. It can be either RTU or ASCII.  
e. ”Enable Modbus Broadcast”—Check this box to send Modbus broadcasts to a specific serial port. Modbus broadcast is Slave  
ID 0h. If selected, the Modbus Hardened Serial Server will send broadcast messages out the serial port and will not expect a  
response. If unselected, it will use slave ID 0h as a standard address.  
f. “Enable 0Bh Exception”—Check this box to enable. When the Modbus slave device does not respond before the timeout has  
been reached or has a bad response (check sum does not match), the 0Bh exception code is transmitted to the Master that  
initiated the Modbus message.  
g. “Enable Serial Message Buffering”—If this option is selected, the gateway will buffer up to 32 message requests per port. If  
this option is unselected, the Modbus Hardened Serial Server will respond with a 06h if it has a message out on the port with  
no response yet.  
h. “Modbus Serial Retries”—Select 0 through 5. This sets the maximum number of times that the Modbus Hardened Serial Server  
will retry to send a Modbus message to a Modbus client, before reporting a 0Bh exception if it is selected. Number of retries is  
limited to 5.  
i. “Milliseconds Modbus Message Timeout”—This is the maximum amount of time to wait for a response to the message. Valid  
value range is from 1 to 65535.  
j. “Milliseconds TX Delay”—This is the minimum amount of time after receiving a response before the next message can be sent  
out. Valid value range is from 1 to 65535.  
k. Save settings by clicking the “Save” button.  
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12. See the Port x ID Remap screen.  
a. To access this screen, click the “Next” button or click the “Port x ID Remap” link on the left side of the screen.  
b. This screen allows you to set Modbus Slave ID Remap settings.  
Figure 3-25. Port ID Remap screen.  
c. The first box in line is the start of the remap range on the serial port you want to remap. Valid value range is from 1 to 247.  
d. The second box in line is the last serial port of that range. Valid value range is from 1 to 247.  
e. The third box in line is the starting ID of a range to remap to. Valid value range is from 1 to 247.  
f. The fourth box in line is auto filled-in based on the range filled in the first 3 boxes. Valid value range is from 1 to 247.  
g. Save settings by clicking the “Save” button.  
13. See the Modbus ID Routing screen.  
a. To access this screen, click the “Next” button or click the “Modbus ID Routing” Link on the left side of the screen.  
b. This screen allows you to set the Modbus Slave ID routing.  
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Chapter 3: Installation and Initial Setup  
Figure 3-26. Modbus ID Routing Screen.  
c. The first box in line is the starting ID of a range you want to route. Valid value range is from 1 to 247.  
d. The second box in line is the last ID of that range. Valid value range is from 1 to 247.  
e. The third box in line is a port or IP address that has slave devices attached.  
f. The fourth box in line is an IP address of the slave device if IP address is chosen in the third box.  
g. Save settings by clicking the “Save” button.  
14. See the Modbus Priority screen.  
a. To access this screen, click the “Next” button or click the “Modbus Priority” link on the left side of the screen.  
b. This screen allows you to configure the Modbus Hardened Serial Server to move high priority messages to the front of the  
serial message buffer.  
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Figure 3-27. Modbus Priority screen.  
c. These settings allow the gateway to move high priority messages to the front of the serial message buffer. The priority can be  
based on the originating IP address, the Modbus ID, the Modbus function code, or any combination of the three. Up to five  
different priorities can be set.  
d. “IP Address”—Used to set a static Internet protocol address for the Modbus Hardened Serial Server.  
e. “Modbus ID”—Valid range is from 1 to 247.  
f. “Function Code”—Valid range is from 1 to 99.  
g. Save settings by clicking the “Save” button.  
Configuring with the Web Interface  
LES431A Modbus Hardened Serial Servers can be configured over the network using a standard Internet browser such as Internet  
Explorer® or Firefox®.  
To open the Web configuration interface:  
1. On a PC connected to the network, open a Web browser.  
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Solve most any Modbus conversion challenge with the Modbus Hardened  
Serial Server.  
Modbus Hardened Serial Servers bridge devices on Modbus serial networks (RS-232, RS-422, or RS-485 with  
those on Modbus TCP networks, allowing seamless integration of any Modbus device. Each serial port is  
accessible over a LAN or WAN by up to 16 simultaneous Modbus TCP masters. The serial servers feature  
auto-detecting 10/100BASE-T copper and fiber optic connections.  
Figure 3-28. Open Web Browser.  
2. In the browser’s address bar, type the IP address of the Modbus Hardened Serial Server.  
Figure 3-29. Type IP Address.  
NOTE: Your Modbus Hardened Serial Server comes from the factory pre-configured to receive an IP address assignment from a  
DHCP server. If a DHCP Server is not available on your network, it will default to 169.254.102.39.  
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Chapter 3: Installation and Initial Setup  
The Web interface Login page appears.  
Figure 3-30. Modbus Hardened Serial Server Login Screen.  
3. The screens for configuring your gateway using a Web browser are the same as those used to configure the Modbus Hardened  
Serial Server Manager software.  
3.4.3 Configuring the LES431A Modbus Hardened Serial Server on Networks without a DHCP Server  
Your Modbus Hardened Serial Server comes from the factory set up to receive an IP assignment from a DHCP Server. If there is  
not a DHCP server on your network, the Modbus Hardened Serial Server will default to IP address 169.254.102.39. If this address  
does not work with your PC, there are two methods to manually configure the network information.  
1. Method 1: Change your PC Network to Match the Modbus Hardened Serial Server.  
a. Open your network connection.  
Figure 3-31. Web properties screen.  
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Chapter 3: Installation and Initial Setup  
b. Click on “Internet Protocol (TCP/IP)” and click “Properties.” Change the parameters to the following:  
IP Address = 169.254.102.1  
Subnet Mask = 255.255.0.0  
Default Gateway = 169.254.102.100  
Figure 3-32. TCP/IP properties screen.  
c. Use the Modbus Hardened Serial Server Manager Software to search for, discover, and configure the Modbus Hardened Serial  
Server.  
2. Method 2: Change the Modbus Hardened Serial Server’s network settings to match your PC using Console Mode.  
a. Connect a null-modem serial cable (crossover cable) from port 1 on the Modbus Hardened Serial Server to an available COM  
port on your PC.  
b. Open Hyperterminal® or similar serial emulation software and connect to the COM port used in step one. Ensure the port is  
configured to 115,200 baud, 8 data bits, no parity, and 1 stop bit.  
c. Enter Console Mode. Press and hold the Modbus Hardened Serial Server’s Mode button for 2 to 10 seconds. The LED indicators  
will respond as follows:  
Model: LES431A  
Port 1 LED: OFF  
Ready LED: OFF  
d. Release the “Mode” button. The READY LED will blink once per second for five seconds. This indicates that the Modbus  
Hardened Serial Server is re-booting in Console Mode.  
e. When the Modbus Hardened Serial Server has successfully restarted in Console Mode, the READY LED will be OFF and the  
PORT 1 LED will be ON.  
f. Open the Modbus Hardened Serial Server Manager Software and select “Serial Port” as the method to connect to the Modbus  
Hardened Serial Server.  
g. After logging in, click on “Network.”  
h. Un-check the box next to “I Want DHCP to setup the Network.”  
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Chapter 3: Installation and Initial Setup  
i. Re-configure the Modbus Hardened Serial Server’s network settings to something within the range of your PC’s network  
settings. For example:  
PC Network Settings  
IP Address = 192.168.0.1  
Subnet Mask = 255.255.0.0  
Default Gateway = 192.168.0.100  
Change the Modbus Hardened Serial Server’s network settings to:  
IP Address = 192.168.0.50  
Subnet Mask = 255.255.0.0  
Default Gateway = 192.168.0.100  
j. Save the settings and remove power from the Modbus Hardened Serial Server.  
k. Re-apply power. Open the Modbus Hardened Serial Server Manager Software and select “Network” as the method to connect  
to the device.  
3.4.4 Configuring the LES431A Modbus Hardened Serial Server via the Serial Port  
Your Modbus Hardened Serial Server can be configured via a serial port using Modbus Hardened Serial Server Manager. To use  
this feature, the Modbus Hardened Serial Server's serial port must be connected to the serial port of a PC (using a null-modem  
cable).  
Modbus Hardened  
Serial Server  
(LES431A)  
Null-modem  
cable  
PC  
Figure 3-33. Console Mode Setup.  
To configure the Modbus Hardened Serial Server, use the Mode switch to put it into Console Mode.  
To enter Console Mode, press and hold the Mode switch for between two and ten seconds. The LED indicators respond as  
follows:  
1. The Ready LED blinks three times per second while the button is being pressed.  
2. The Modbus Hardened Serial Server is in Console Mode when Port 1 LED is On and the Ready LED is Off.  
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Chapter 3: Installation and Initial Setup  
To configure the Modbus Hardened Serial Server, open the Modbus Hardened Serial Server Manager software and set up  
the Modbus Hardened Serial Server’s parameters as required.  
1. Under Connection, select “Serial Port.”  
Figure 3-34. Connection.  
2. If you do not know which COM port your Modbus Hardened Serial Server is connected to, select “Search all serial ports for the  
device” under Serial Port Options. If you do know, you may specify the COM port by selecting “The device is connected to this  
serial port” under Serial Port Options and using the pull-down menu to choose the COM port.  
Figure 3-35. Serial Port Selection.  
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Chapter 3: Installation and Initial Setup  
3. The remaining screens are identical to those shown in configuring your gateway using a network connection.  
To exit Console Mode, press and hold the “Mode” switch for two seconds.  
The LEDs go back to their normal states when the device resumes normal operation.  
3.5 LES431A Modbus Hardened Serial Server Operational Connections  
LES431A Modbus Hardened Serial Servers can operate in Direct IP Mode.  
Using LES431A Modbus Hardened Serial Servers in Direct IP Mode  
A Direct IP connection allows applications using TCP/IP socket programs to communicate with the COM ports on the Modbus  
Hardened Serial Server. In this type of application, the Modbus Hardened Serial Server is configured as a TCP server. The socket  
program running on the PC establishes a communication connection with the Modbus Hardened Serial Server. The data is sent  
directly to and from the serial port on the server.  
To set up a Direct IP Mode connection:  
1. Connect the Modbus Hardened Serial Server to the network and a Modbus network as described in previous sections.  
2. Configure the Modbus Hardened Serial Server with the appropriate network settings (using Modbus Hardened Serial Server  
Manager or the Web interface).  
3. Configure your software application with the appropriate IP address and port number to communicate with the Modbus  
network(s).  
Network  
Serial device  
Modbus Hardened  
PC  
Serial Server  
(LES431A)  
Figure 3-36. Direct IP Connection.  
3.6 Initiating a Hardware Reset on the Modbus Hardened Serial Server  
To initiate a Hardware Reset on the Modbus Hardened Serial Server, press and hold the Mode switch for 0 to 2 seconds, and then  
release it. The LED indicators respond as follows:  
1. The Ready LED blinks three times per second while the button is being pressed.  
2. The Modbus Hardened Serial Server is in Reset Mode when the Port 1 LED is On and the Ready LED is Off.  
3. The LEDs go back to their normal states when the device resumes normal operation.  
3.7 Reloading Factory Defaults  
To reload Factory Defaults, press and hold the Mode switch for more than 10 seconds. The LED indicators respond as follows:  
1. The Ready LED blinks three times per second while the button is being pressed.  
2. The Modbus Hardened Serial Server is in Factory Default Mode when the Port 1 LED and the Ready LED are both On.  
The Modbus Hardened Serial Server reloads all factory default configuration parameters.  
3. The LEDs go back to their normal states when the device resumes normal operation.  
NOTE: Factory default parameters are listed in Appendix A.  
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Chapter 4: Upgrading the Modbus Hardened Serial Server Firmware  
4. Upgrading the Modbus Hardened Serial Server Firmware  
Occasionally, updated firmware may become available for your Modbus Hardened Serial Server. The firmware can be upgraded  
using the Modbus Hardened Serial Server Manager software. The following procedure describes the firmware updating process:  
1. Click the ”Upgrade” button to open the “Firmware Upgrade” dialog box.  
Figure 4-1. Firmware Upgrade Dialog Box.  
The name of the currently selected Modbus Hardened Serial Server appears in the top drop-down list. Other Modbus Hardened  
Serial Servers (that have already been discovered) can be selected from the drop-down list, if desired.  
The current firmware version of the selected Modbus Hardened Serial Server is shown in the text below the Modbus Hardened  
Serial Server name.  
Information about the selected firmware file is shown in the third text box.  
4.1 Downloading Firmware Files  
The “Firmware File” list (second box) displays all firmware files in the firmware installation folder. Only firmware that is compatible  
with the selected Modbus Hardened Serial Server is available in this list.  
To download the latest firmware files from an FTP site on the Internet:  
1. Click the “Internet” button at the bottom of the window. The Modbus Hardened Serial Server Manager connects to an FTP  
server on the Internet.  
2. Click the “Check for Updates” button. “Progress Bar” and “Progress Box” display information about and progress of the  
download.  
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Chapter 4: Upgrading the Modbus Hardened Serial Server Firmware  
To download the latest firmware files from a file:  
1. Click the “Browse” button to open an “Open File” dialog box.  
2. Browse to the drive and folder containing the firmware file.  
3. Select and download the file to the local firmware folder.  
4.2 Uploading the Firmware to the Modbus Hardened Serial Server  
To upgrade the firmware:  
1. In the Modbus Hardened Serial Server Selection drop down list, select the Modbus Hardened Serial Server to be upgraded.  
2. In the Firmware Description drop-down list, select the firmware to upload to the Modbus Hardened Serial Server.  
3. Click the “Upgrade” button. The Progress bar and Progress box provide information on the progress of the transfer.  
4. In the Firmware File drop-down list, select the firmware file to upload to the Modbus Hardened Serial Server.  
5. Click “Upgrade.”  
The Progress box and Progress bar display information on the upgrading process.  
6. When the upgrade process is complete, click “Close.”  
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Chapter 5: Diagnostics  
5. Diagnostics  
Clicking the Diagnostics icon opens the “Diagnostics” dialog box and enables you to check the operation of connected Modbus  
Hardened Serial Servers on the local computer.  
The Computer Information box displays information about the type of network connections, the IP addresses, Subnet Masks, and  
Default Gateways in use.  
Figure 5-1. Diagnostics dialog box.  
Testing a Modbus Hardened Serial Server Connection  
To run diagnostics on a Modbus Hardened Serial Server:  
1. Click the “Diagnostics” icon.  
The “Diagnostics” dialog box appears.  
2. In the drop-down box, select the specific Modbus Hardened Serial Server you want to check.  
3. Click the “Start” button. Information about the progress of the pinging process is displayed in the “Test Progress” box.  
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Chapter 5: Diagnostics  
Figure 5-2. Testing a Modbus Hardened Serial Server connection.  
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Chapter 6: Application Examples  
6. Application Examples  
Modbus Hardened Serial Servers can be used to integrate Modbus networks in a wide variety of settings. Because each setting  
has its own requirements, users may not understand how a Modbus Hardened Serial Servers helps, or if it’s appropriate for their  
specific needs.  
The following scenarios are examples only, and many others are possible. Contact Black Box Technical Support at 724-746-5500  
or [email protected] for information on other applications.  
6.1 Ethernet Master and Serial Slaves  
Your Modbus Hardened Serial Server can be used to integrate serial slave devices on a Modbus TCP network. This allows TCP  
Masters to control serial slave devices.  
IP slave  
IP master  
IP slave  
Ethernet  
RS-232 Serial  
19.2 kbps  
RTU slave  
ID 200  
Modbus Hardened  
Serial Server  
(LES431A)  
Figure 6-1. Ethernet Master with Serial Slaves.  
1. Log into your Modbus Hardened Serial Server software.  
2. Access the Serial Port One setup screen by clicking the link on the left side of the screen.  
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Chapter 6: Application Examples  
Figure 6-2. Serial Port 1 setup.  
3. Configure Serial Port 1. In this case, it is RS-232, 19.2 kbps, 8 data bits, 1 stop bit, and even parity. Save the settings.  
4. Access Port 1 Modbus by clicking the link on the left side of the screen.  
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Chapter 6: Application Examples  
Figure 6-3. Port 1 Modbus.  
5. Configure the Port 1 Modbus Settings. In this case, Attached” should be slaves, “Modbus” should be RTU. The other settings  
depend on your application.  
6. Access Modbus ID Remapping for each port and configure as necessary.  
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Figure 6-4. Port x Modbus Slave ID remapping.  
7. Access Modbus ID Routing. Configure as necessary. In this example, Slave ID 200 is mapped to serial port 1.  
Figure 6-5. Modbus ID routing.  
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Chapter 6: Application Examples  
8. Access the Modbus Priority screen and configure as necessary.  
Figure 6-6. Modbus priority.  
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Chapter 6: Application Examples  
6.2 Serial and Ethernet Masters, Serial and Ethernet Slaves  
Your Modbus Hardened Serial Server can also integrate multiple master devices onto serial and Ethernet Networks.  
IP slave  
ID 151–160  
IP slave  
ID 150  
IP master  
Modbus Hardened  
Serial Server  
(LES431A)  
ASCII slave  
ID 205  
ASCII slave  
ID 1  
ASCII slave  
ID 5  
Figure 6-7. Serial and Ethernet masters, Serial and Ethernet slaves.  
1. In this example, Serial Port 1 has an RTU master attached. Configure the serial port settings as appropriate for the device.  
Access the Port 1 Modbus screen and configure the port for Modbus master and RTU.  
Figure 6-8. Port 1 Modbus.  
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Chapter 6: Application Examples  
2. Configure the Modbus slave ID routing. In this case Modbus slaves 1 through 5 and 205 are on Serial Port 1. Modbus slaves  
150 and 151 through 160 have IP assignments.  
Figure 6-9. Modbus Slave ID routing.  
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Chapter 6: Application Examples  
6.3 Serial Masters, IP Slaves  
Serial masters can be used to control IP slaves.  
IP slave  
ID 151–160  
IP slave  
ID 1–100  
IP slave  
ID 150  
Serial RS-232  
9.6 kbps  
Modbus Hardened  
ASCII master  
Serial Server  
(LES431A)  
Figure 6-10. Serial masters, IP slaves.  
1. In this example, an ASCII master is connected to Serial Port 1. Configure the serial port as appropriate for this device.  
Figure 6-11. Port 1 Serial.  
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2. Access the Modbus screen for each port and configure as appropriate. In this case, Port 1 has an ASCII master attached.  
Figure 6-12. Port 1 Modbus.  
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Chapter 6: Application Examples  
3. Set up the Slave ID Routing to associate IP addresses with the appropriate Slave ID.  
6.4 Identical Hard-Coded Slaves  
In this example, two slave devices that are hard-coded with the same ID are required. This is accomplished by putting them on  
different serial ports.  
Serial RS-485  
Modbus Hardened  
Serial Server  
(LES431A)  
ASCII slave  
ID 1  
ASCII slave  
ID 5  
ASCII Master  
Figure 6-13. Identical hard-coded slaves.  
6.5 Identical Production Lines  
In this example, identical or backup production lines can be controlled by the same IP Master. This allows the duplicate networks  
to be configured identically, saving documentation and maintenance time.  
IP Master  
Ethernet  
Serial  
Modbus Hardened  
Serial Server  
(LES431A)  
RTU slave  
ID 3  
RTU slave  
ID 2  
Figure 6-14. Identical production lines.  
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Chapter 7: Modbus Help  
7. Modbus Help  
7.1 Modbus ASCII/RTU Basics  
The Modbus protocol emerged in the mid-1970s as an early protocol for linking terminals with Modicon PLCs using a master/slave  
(sometimes called a master/client) relationship. A simple, open, message-based protocol, it caught on quickly and became a  
de facto standard in the industry. It supports asynchronous point-to-point and multidrop communications and can be used with a  
variety of serial interfaces (RS-232, RS-422, RS-485, modems, etc.).  
The original Modbus specification included two possible transmission modes: ASCII and RTU. Modbus RTU mode is the most  
common implementation, using binary coding and CRC error-checking. Modbus ASCII messages mode, though somewhat more  
readable because it uses ASCII characters, is less efficient and uses less effective LRC error checking. ASCII mode uses ASCII  
characters to begin and end messages, whereas RTU uses time gaps (3.5 character times) of silence for framing. The two modes  
are incompatible, so a device configured for ASCII mode cannot communicate with one using RTU.  
All Modbus communications are initiated by Modbus masters using a polling query/response format. The master can send  
broadcast messages (using a slave address of 0), which all slaves accept, but do not reply to. More commonly, the master polls  
individual slaves sequentially. In each poll, it sends a message containing a device address, followed by a function code, any data  
that may be required, and an error check field. The addressed slave responds with a similar message structure. Typically, it repeats  
back its address and the function code, and then sends a field indicating the number of bytes of data it is sending, followed by  
the data and the error check field.  
Slave addresses can range from 1 to 247. Function codes include several common ones typically used in all applications and  
additional ones that may be implemented in specific cases. Common function codes include: Read Coil Status (01), Read Input  
Status (02), Read Holding Registers (03), and Read Input Registers (04).  
When a master sends a message to a slave, it expects to receive a valid response within a certain length of time. If the slave does  
not receive the message, or if the slave receives the message but an error is detected, it does not respond. If the slave cannot  
respond appropriately for some other reason (e.g. it does not recognize the function code), it will return a message containing an  
exception response.  
7.2 Hints and Tips  
A few simple suggestions that may assist you if your system is experiencing problems include:  
• Slowing down the polling rate may be helpful if power cycling doesn’t cure the problem.  
• A common misperception is that every serial network must terminate with a resistor. While this was true of early serial network  
configurations, it’s typically the wrong answer—contact Black Box Technical Support at 724-746-5500 or [email protected]  
and verify if you’re an exception.  
A sometimes difficult problem is the difference in grounding voltage between various network locations. Stray voltage from  
lightning or other sources may also find its way onto the network. These conditions make isolation necessary in many settings.  
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Appendix A: Default Modbus Hardened Serial Server Settings  
Appendix A. Default Modbus Hardened Serial Server Settings  
Table A-1. Default server settings.  
Setting  
Default Value  
Server Name  
Password  
DHCP  
User assigned  
Password field is blank from factory  
Enabled  
IP Address  
DHCP will configure. If a DHCP assignment is not available, the device will default  
to 169.254.102.39  
Net Mask  
255.255.255.0  
Modbus Serial Server  
MAC Address  
Firmware Version  
Hardware Version  
Port  
169.254.102.100  
Fixed—see bottom label  
X.X.X (Current Version)  
X.X (Current Version)  
1
Serial port mode  
Baud Rate  
RS-232  
9600  
Data bits  
8
Parity  
None  
Stop bits  
1
Flow Control  
Protocol  
None  
TCP  
Serial timeout  
Inter-character timeout  
Protocol  
0 seconds  
0 ms  
TCP  
TCP port  
Port 1 = 4000  
1
Max. connection  
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Appendix B: Connector Pinouts  
Appendix B. Connector Pinouts  
B.1 DB9 M Connector  
Figure B-1. DB9 M connector.  
Table B-1. DB9 M connector pinout.  
DB9 M Pin  
Direction RS-232  
1
2
3
4
5
6
7
8
9
Input  
Input  
Output  
Output  
DCD  
RXD  
TXD  
DTR  
GND  
DSR  
RTS  
CTS  
RI  
Input  
Output  
Input  
Input  
B.2 Terminal Block  
Figure B-2. Terminal block connector.  
Table B-2. Terminal block connector pinout.  
Terminal  
RS-232  
Direction (RS-232)  
RS-422  
TDA (-)  
TDB (+)  
RDA (-)  
RDB (+)  
GND  
RS-485  
Data A (-)  
Data B (+)  
A
B
C
D
E
RTS  
Output  
Output  
Input  
Input  
TD  
CTS  
RD  
GND  
GND  
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Appendix B: Connector Pinouts  
NOTES:  
1. In RS-422 mode, TX lines are outputs and RX lines are inputs. Connect the serial server TXB(+) line to the RXB(+) line  
of the serial device, and the serial server TXA(-) to the RXA(-) of the serial device.  
2. Ground is signal ground and provides a common mode reference for the RS-422 receivers and transmitters.  
B.3 Standard Ethernet Cable RJ-45 Pinout  
Figure B-3. RJ-45 Ethernet cable pinout.  
Table B-3. RJ-45 cable pinout.  
RJ-45 Pin  
Signal  
Wire Color  
White-Green  
Green  
1
2
3
4
5
6
7
8
TX+  
TX-  
RX+  
White-Orange  
Blue  
Not used  
Not used  
RX-  
White-Blue  
Orange  
Not used  
Not used  
White-Brown  
Brown  
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Appendix C: Glossary  
Appendix C. Glossary  
ADU—Application Data Unit.  
ASCII—American Standard Code for Information Interchange.  
Baud Rate—Number of bits per second.  
CRCCyclical Redundancy Checking.  
Data Bits—Number of bits per byte, normally 7 with Modbus ASCII, and 8 with Modbus RTU.  
DHCP—Dynamic Host Configuration Protocol.  
Flow Control—The process of managing the rate of data transmission between two nodes.  
Function Code—A code field that tells the Modbus Hardened Serial Server what kind of action to perform.  
GUI—Graphical User Interface.  
IP—Internet Protocol.  
IPv4—Internet Protocol version 4.  
LED—Light emitting diode. Used as a visual indicator.  
LES431A—Modbus Hardened Serial Server, RS-232/RS-422/485 on serial port.  
MBAP—MODBUS Application Protocol.  
MEI—Multi Electrical Interface via RS-232/422/485.  
Modbus—A request/reply protocol that offers services specified by function codes.  
Modbus Gateway — A bridge to get from Modbus TCP to Modbus Serial.  
Parity Bit—A binary digit that is added to ensure that the number of bits with value of one in a given set of bits is always even or  
odd. It may also be a Mark (1), or a Space (0).  
PDU—Protocol Data Unit.  
RS-232—Interface between data terminal equipment and data circuit-terminating equipment employing serial binary data  
interchange.  
RS-422—Electrical characteristics of generators and receivers for use in balanced digital point-to-point systems.  
RS-485—Electrical characteristics of generators and receivers for use in balanced digital multipoint systems.  
RTU—Remote Terminal Unit.  
Stop Bit—Number of bit times after a character is transmitted before the next character can start transmission.  
TCP—Transmission Control Protocol  
Unit ID—Unit Identifier. This is the same as the slave’s address.  
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NOTES  
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NOTES  
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NOTES  
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Black Box Tech Support: FREE! Live. 24/7.  
Tech support the  
way it should be.  
Great tech support is just 30 seconds away at 724-746-5500 or blackbox.com.  
About Black Box  
Black Box provides an extensive range of networking and infrastructure products. You’ll find everything from cabinets and racks  
and power and surge protection products to media converters and Ethernet switches all supported by free, live 24/7 Tech support  
available in 30 seconds or less.  
© Copyright 2013. Black Box Corporation. All rights reserved. Black Box® and the Double Diamond logo are registered trademarks of BB Technologies, Inc.  
Any third-party trademarks appearing in this manual are acknowledged to be the property of their respective owners.  
LES431A user manual, version 2  
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