Schneider Electric manual Modem Booster, How the Parameter Applies to the BM85

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3.4.7Modem Booster

How the Parameter Applies to the BM85

The Modem ￿ooster applies to ￿M85 Modbus ports that will be configured as Network ports￿ You will need this information for any port you will be using as a Modbus Network port￿

The parameter does not apply to a port that is being configured as a single Master or Slave device port￿ You can bypass the information below for any port you will be using as a single Master or Slave port￿

The Purpose of the Parameter

The Modem ￿ooster parameter determines how the ￿M85 will handle Modbus commands to networked slave devices at a Modbus port￿

When the ￿M85 receives a command that is addressed to a slave device at a Modbus network port, a response is expected from the slave device￿ Two methods are available for handling the response, defined by the function code in the command issued by the master￿ The two kinds of commands are:

V `Suspend' Transactions (Function Code 126) With this type

of command, the slave device will send a response after it completes the action requested in the command￿ The master device waits for the response, and therefore other commands on the Modbus network cannot be processed until the slave's action has been completed and its response received￿ Other transactions intended for the port must remain pending until that time￿ Some.commands, such as `start' and `search' commands from a Modicon P230 programming panel to a slave controller on the Modbus network, can take a relatively long time for processing in the controller, in the range of 15 seconds to 2 minutes￿

V `Polling' Transactions (Function Code 13) With this type of command, the slave will send an acknowledgement of receipt of the command, and must be polled later by the master device to determine if the requested action has been completed￿ The command acknowledgement frees the Modbus network for processing messages to other devices on the port￿ The ￿M85 will poll the slave device periodically to determine if the command action has been completed￿ It will then send the final response to the originating device￿

The Modem ￿ooster parameter allows you to specify which of the two methods will be used at the ￿M85 Modbus port￿

34 Configuring the Modbus Models

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Contents August Page Preface PrefacePage Contents Chapter Configuring the Modbus Models Vi ContentsChapter Configuring the Programmable Models Dica0+. C+de/ D1.i*g D+3*+adi*gAppendix a Compatible Devices and Cables Chapter Installing the BM85Viii Contents Glossary Index FiguresPage Chapter Introducing the BM85 Bridge/Multiplexers Introducing the BM85 Bridge/MultiplexersBM85 on Modbus Plus Bridge/Multiplexers on Modbus PlusModbus Plus Network BM85 Bridge/Multiplexers on Modbus Plus Mounting Methods Overview of BM85 ModelsAvailable Models Operating Power Configuration MethodsProgrammable Port Models BM85 With Typical RS232/485 Devices Downloading the Application Configuring the Programmable ModelsDeveloping the Application Part Number Description Software Development Tool KitContact Telephone Modbus Port Models BM85 With Typical Modbus Devices Specifications AC/DC Power Models Bridge/Multiplexer Models for AC/DC PowerDevelopment Requirement Supplied by Customer Specifications DC/DC Power Models Bridge/Multiplexer Models for DC/DC PowerSoftware Development Tool Kit Page Chapter Device Addressing Message Routing Device Addressing and Message RoutingModbus Plus Message Routing Paths Routing to Programmable ControllersRouting to Host Based Network Adapters Routing to BM85 Bridge/MultiplexersRouting to Serial Ports on BM85 Programmable Models Routing to a Single Slave Device on BM85 Modbus ModelsModbus Port Models Modbus Address ConversionProgrammable Port Models Silent Master Port Addressing Routing Examples Routing ExamplesFrom Routing Path From Address Routing MethodPage Chapter Configuring Modbus Models Configuring the Modbus ModelsModels Covered in This Chapter An Overview of the Configuration ProcessBefore You Start Required Equipment Configuration Checklist Modbus Port Parameters Information You Will NeedPort Type MasterSlave NetworkSetting the Parameter Slave Device AddressCommunication Parameters Port PriorityLink Timeout Timeout Examples Modem Booster How the Parameter Applies to the BM85Modem Booster Example Modbus Address Map Table Location Modbus Address Five±Byte Routing PathIf a Match is Not Found Configuring the Modbus Models Silent Master Port Considerations Setting the Switches Configuring the Modbus PortsConnecting Power for the Configuration Connecting the Terminal Your Configuration Commands Command Action RangeDefault Configuration Parameter PortHelp Screens V5, V6, V7 Your Configuration ScreensEntering Commands Into Your Screens Printing the Configuration Saving the ConfigurationYour V1 Screen Your V1 Screen LayoutUsing the V1 Screen ExampleYour V2 and V3 Screens Your V2 or V3 Screen LayoutUsing the V2 or V3 Screen Your V4 Screen Your V4 Screen LayoutUsing the V4 Screen EnterSetting the Modbus Plus Address BM85 Modbus Models Modbus Plus Address SwitchesHow to Set the RUN Mode Setting the RUN ModeWhen to Set the RUN Mode Modbus Port Indicator Codes Hardware Error Codes 11 .. HexModbus Driver Error Codes 24 .. E Hex Indicators Pattern Hexadecimal DigitModbus Plus Processor Interface Error Codes 34 .. Hex LLC Layer Error Codes 81 ... A3 HexPage Chapter Configuring Programmable Models Configuring the Programmable ModelsBefore You Start Equipment for Writing the Application Program Equipment For Downloading the Application ProgramOverview of the Development Software Development Software FilesREADME.DOC Information File File Name PurposeUsing the Test and Demonstration Source Files Test and Demonstration Source FilesMultitasking in Your Application Key Sequence PurposeInstallation Steps Installing the Development SoftwareDefault Parameters Key Sequence Purpose Alt±C Project close Preparing the BM85 for Downloading Setting the Configuration Switches BM85 Programmable Models Configuration SwitchesBM85 Programmable Models Modbus Plus Address Switches Indicator Codes During Downloading Error CodesError Code Hexadecimal Meaning Normal Download CodesSetting the RUN Mode Installing the BM85 Installing the BM85Shelf/Panel Mounted Models Installing the BM85 HardwareMounting the BM85 Rack Mounted Models Horizontal MountingVertical Mounting Part Number Mounting MethodRear Panel View Front Panel View Connecting DC Power Connecting the Power CablesConnecting AC Power BM85±000 Rear Panel Connecting the Network and Serial Cables BM85000Connecting a Single Network Cable Connecting Dual Network CablesConnecting Dual-Cable Units on Single-Cable Networks Connecting Serial Port CablesModbus and Serial Port Indicators Reading the IndicatorsPower and Ready Indicators Modbus Plus Port Status Indicators Attaching Identification Labels Modbus Plus Port LabelSerial Port Parameters Label Serial Port Parameters LabelPage Appendix a Compatible Devices Cables Compatible Devices and CablesCompatible Devices and Cables AbbreviationsMaking `Quick Connections Modicon Devices and CablesDevices and Cables for Configuring Modbus Ports Cables for Modbus Master DevicesCables for Modbus Slave Devices Device Cable and Adapter CombinationModbus/RS232 Cable Wiring Diagrams Modbus/RS232 Cable Wiring DiagramsModbus/RS232 Ports Pinout Serial Ports Pinout ± Modbus/RS232 BM85 Direction PurposeRS485 Ports Pinout Serial Ports Pinout ± RS485 BM85 Direction PurposeAcknowledgement AddressBaud rate BitBridge Plus BroadbandBus CarrierbandDIO Drop Adapter Distributed I/ODownload Drop cableFrame descriptor Global InputGlobal Output Host computerLayer MediumModbus Modbus PlusModem Network Option ModuleNode OSI ModelPeer-to-peer communication Physical LayerPort ProtocolSegment Serial portSlot time Specific InputSystem TapTerminator TokenPage Index IndexIndex