RS-422/485 Four-Wire Mode | B&B Electronics MES1B, MES1A instruction

Hardware Overview

Figure 4. MES1B Serial Connector

RS-422/485 Four-Wire Mode

When the MES1B is configured to operate in RS-422/485 four-wire mode (RS-422/485 switch in the left position) its receive terminals are connected to the transmit terminals of the Modbus device it is communicating with. Its transmit terminals are connected to the receive terminals of the Modbus device it is communicating with.

Figure 5. RS-422/485 Four-Wire Connection

RS-485 Two-Wire Mode

When the MES1B is configured to operate in RS-485 two-wire mode (RS-422/485 switch in the right position) the two-wire RS- 485 two-wire communications cable pair is connected to Terminals TDB and TDA. The communications cable ground/shield is connected to GND.

Manual Documentation Number: MES1A/MES1B-2106m

PN7138-rev001

B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 – www.bb-elec.comB&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445 – www.bb-europe.com

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B&B Electronics MES1B, MES1A manual RS-422/485 Four-Wire Mode, RS-485 Two-Wire Mode

Contents

Modbus TCP Modbus Ascii / RTU Converters Models MES1A, MES1B Manual Documentation Number MES1A/MES1B-2106m International Headquarters Page Manual Documentation Number MES1A/MES1B-2106m PN7138-rev001 Page Table of Contents Configuring the MES1A/B Modbus Basics Manual Documentation Number MES1A/MES1B-2106m About this Manual IntroductionSupport About Your MES1A/B Converter Features Package Checklist Indicators, Switches and ConnectorsPower LED Hardware Overview Link LED Reset SwitchActivity LED RS-422/485 Switch MES1B only Ethernet Port ConnectorDB-9M Serial Port Connector MES1A only RS-422/485 Connector MES1B only RS-422/485 Four-Wire Mode RS-485 Two-Wire Mode Connecting the Hardware Power Connector MES1A Connections MES1B Connections Hardware Overview Getting Started QuickStart Discover the MES1A/B on the Network Installing the Device Installer Using the Device Installer SoftwareSystem Requirements Starting the Device Installer Discovering Devices Device Installer Main Window Getting Device Details Connecting to the MES1A/B Press Enter to go into Setup Mode Telnet Configuration Tab with Settings Getting Started Configuring the MES1A/B Telnet Configuration Tab Navigating the Configuration Menu Unit ID to IP Address Table Saving Configuration Settings Reconfiguring to Factory SettingsTo Reconfigure the MES1A to Factory Settings To Reconfigure the MES1B, to Factory Settings Network/IP Settings IP Address Auto-IP Default GatewayStatic IP Address Telnet Configuration Password Serial and Mode SettingsNetmask Attached Device ProtocolSerial Protocol MES1A Serial Interface Serial InterfaceMES1B Serial Interface Modem/Configurable Pin Settings Serial Parameters Advanced Modbus Protocol Settings Advanced Modbus Protocol Settings Menu For Auto Slave Address / Unit ID Source…255 Allow Modbus Broadcasts Use MB/TCP 00BH/00AH Exception Responses= No = Yes Character Timeout Disable Modbus/TCP PipelineMessage Timeout Unit ID to IP Address Lookup Table Settings Serial TX Delay after RXSwap 4x/0H to Get 3x/1x Close Idle TCP Sockets After Add, Delete, Exit Select Function Redundant Entry Retries AfterModbus Address From/To Slave IP Address Managing Device Lists Using Other Device Installer FeaturesCreating a New Device List Display Devices Using Icons Saving Device ListsOpening Device Lists Device List Display Options Display the Hardware MAC Address Adding a Device ManuallyDisplay the Device Name Assigning an IP Address using Device Installer Using Device Installer to Assign an IP Address Using the Devices Details Tab Upgrading Firmware Adding Info to the Device Details Tab Installing Pre-Saved Configuration Files Saving Setup Records Installing Setup Records Save Setup Records Dialog Box Logging Search and Upgrade Data Options Window, Customization Tab Using Ping Using Help Using Other Device Installer Features Modbus Basics Modbus ASCII/RTU Modbus/TCP Hints and Tips Modbus Basics Appendix a Default Configuration Settings Swap 4x/0H to get 3x/1x Default Configuration Settings Appendix B Product Specifications Manual CD-ROM disc Product Specifications Appendix C Dimensional Diagrams Dimensional Diagram of the MES1A Dimensional Diagram of the MES1B Appendix D Serial Connections DTE MES1B Terminal Block Pin-out for RS-485 Two-Wire Operation RJ-45 Pin Signal Wire Color Appendix E Network Connections Network Connections Declaration of Conformity