Cooper Bussmann BU-245U-E Modbus TCP to RTU Gateway

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Cooper Bussmann BU-245U-E Wireless Ethernet & Device Server User Manual

Some of the possible Serial Gateway topologies are illustrated below.

There are software packages available (i.e., SerialIP Redirector by Tactical Software) that can create a virtual serial port on a PC.This virtual serial

port can be configured to connect to a BU-245U-E serial port. Standard programs can then be used to access this serial port as if it were actually

connected to the PC.Alternatively HyperTerminal may be used to connect to a serial port on the BU-245U-E. When creating the HyperTerminal

connection, select “Connect Using:TCP IP (Winsock)”, enter the IP address of the BU-245U-E, and the port selected in the “Network port” field.

Modbus TCP to RTU Gateway

The Modbus TCP to RTU Gateway allows an Ethernet Modbus/TCP Client (Master) to communicate with a serial Modbus RTU Slave.The

BU-245U-E makes this possible by internally performing the necessary protocol conversion. The conversion is always performed by the

BU-245U-E which is directly connected to the Modbus serial device (i.e., only this module needs to have Modbus TCP to RTU Gateway enabled).

The above example demonstrates how a Modbus/TCP Client (Master) can connect to one or more Modbus RTU (i.e serial) Slaves. In this example

the BU-245U-E Access Point is configured with the “RS232 Modbus/TCP to RTU Gateway”enabled. Once enabled, the gateway converts the

Modbus/TCP queries received from the Master into Modbus RTU queries and forwards these over the RS232 port to the Slave.When the serial

response to the query arrives from the Slave, it is converted to a Modbus/TCP response and forwarded via the network to the Modbus/TCP

Master.If no response was received serially by the BU-245U-E within the configured Response Timeout, the BU-245U-E will initiate a number of

retries specified by the configured Maximum Request Retries.

The Modbus TCP to RTU Gateway may be configured to operate on either the RS 232 or RS 485 port.

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Contents

Main Page IMPORTANT NOTICE GNU FREE DOCUMENTATION LICENSE: CONTENTS Page CHAPTER 1 INTRODUCTION 1.1 Network Topology Access Point vs. Client Bridge vs. Router 1.2 Getting Started Quickly CHAPTER 2 INSTALLATION 2.0 General 2.1 Antenna Installation Dual Antenna Installations Line-of-Sight Installations Antennas Installation tips Omni-directional Antennas Directional Antennas. 2.2 Power Supply 2.3 Serial Connections RS232 Serial Port DB9 Connector Pinouts RS485 Serial Port 2.4 Discrete (Digital) Input/Output CHAPTER 3 OPERATION 3.0 Start-up Access PointStart-up (BU-245U-E-G) Access PointStart-up (BU-245U-E-A) Client Start-up 3.1 Selecting a Channel 802.11b/g (2.4GHz) Page 802.11a (5GHz) Dynamic Frequency Selection (DFS) 3.2 Configuring the Unit for the First Time Default Configuration Accessing Configuration for the First Time Method 1 - Set PC to same network as BU-245U-E Method 2 - Set BU-245U-E Network address to match the local network 3.3 Quick Start Configuration Quick Start Configuration 3.4 Network Configuration Network Settings Webpage Fields 3.5 Security Menu Page 3.6 Normal Operation Transparent Bridge Operation Router Operation 3.7 Radio Configuration Page Channel Selection Radio Throughput Throughput and Repeaters 3.8 Advanced Radio Configuration 3.9 DHCP Client Configuration 3.10 DHCP Server Configuration 3.11 DNS Server Configuration 3.12 Spanning Tree Algorithm 3.13 Compatibility 3 Address (Layer 3 Bridge) & 4 Address Mode 240U-E Compatibility 3.14 Multiple AP Repeater Mesh Network Page Example Extending Range Using WDS Example - Roaming with WDS Access Points Example Adding Redundancy Page Example WDS Routed Network WDS Connections: 3.15 Routing Rules 3.16 Wireless Message Filtering MAC Address Filter Configuration: IP Address Filter Configuration: ARP Filter Configuration 3.17 Serial Port Configuration RS-232 PPP Server Serial Gateway (Server/Client/Multicast) Serial Gateway (Modbus - Modbus RTU to TCP) Modbus TCP to RTU Gateway 3.18 Serial Menu RS232 / RS485 Serial Port Configuration RS232 PPP Server (Only RS232) RS232 / RS485 Modbus TCP / RTU Converter RS232 / RS485 Serial Gateway 3.19 Multicast Pipe Manager Multicast Pipe Manager 3.20 Digital Input/Output 3.21 Modbus I/O Transfer Page Modbus TCP Configuration on I/O Transfer Menu: Modbus TCP Client Mappings on I/O Transfer Menu: 3.22 Module Information Configuration Module Information Webpage Fields 3.23 System Tools 3.24 TCP Throughput Test Internal Throughput Test Page 3.25 Remote Configuration 3.26 Configuration Examples Setting a BU-245U-E to Factory Default Settings Extending a Wired Network Connecting two Separate Networks Together Extending Range of a Network with a Repeater Hop CHAPTER 4 DIAGNOSTICS 4.0 Diagnostics Chart Boot Status LED Indication During Start-up 4.1 Diagnostic Information Available Connectivity Connectivity Parameters Site Survey 4.2 Channel Survey Page 4.3 Custom Survey Example One Example Two 4.4 Statistics Network Traffic Analysis 4.5 Internal Diagnostics Modbus Registers Connection Information Page 4.6 Testing Radio Paths Connection and Signal Strength Throughput Test 4.7 Utilities Ping Ipconfig Arp Route CHAPTER 5 SPECIFICATIONS General Power Supply Radio Transceiver Serial Ports System Parameters APPENDIX A FIRMWARE UPGRADE Web Based Upgrade APPENDIX B GLOSSARY Page Page Page APPENDIX C CHANNELS 802.11b/g 802.11b/g Turbo 802.11a Maximum Radio Transmitter Power 802.11a Turbo - Maximum Radio Transmitter Power APPENDIX D 802.11A& TX POWER dB to mWatt Conversion A PPENDIX E EXTERNAL I PERF T Materials Installation Iperf Applications Page JPerf Application APPENDIX F GNU FREE DOC LICENSE Version 2, June 1991 Preamble TERMS AND CONDITIONS FOR COPYING,DISTRIBUTION AND MODIFICATION. Page NO WARRANTY Page C Customer Assistance Your Authorized Cooper Bussmann Distributor is: