Beijer-electronics BFI-P2 V1.21 Manual de usuario descargar pdf (Pagina 46)

UserGuideRevision1.12

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www.beijerelectronics.com

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9. Serialcommunications

9.1. RS‐485communications

AnRJ45connectorlocatedonthedriveallowstheusertoconnectthedrivetoaModbusRTUnetworkorCANBusviaawiredconnection.

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TheelectricalsignalarrangementoftheRJ45connectorisshownasfollows:

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CAN‐

CAN+

0Volt

RemoteKeypad/PCConnection‐

RemoteKeypad/PCConnection+

+24VoltRemoteKeypadPowerSupply

RS485‐ModbusRTU

RS485+ModbusRTU

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9.2. ModbusRTUCommunications

9.2.1. ModbusTelegramStructure

TheDrivesupportsMaster/SlaveModbusRTUcommunications,usingthe03ReadHoldingRegistersand06WriteSingleHoldingRegister

commands.ManyMasterdevicestreatthefirstRegisteraddressasRegister0;thereforeitmaybenecessarytoconverttheRegisterNumbers

detailinsection9.2.2subtracting1toobtainthecorrectRegisteraddress.Thetelegramstructureisasfollows:‐

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Command03–ReadHoldingRegisters

MasterTelegram Length  SlaveResponse Length

SlaveAddress 1 Byte  SlaveAddress 1 Byte

FunctionCode(03) 1 Byte  FunctionCode(03) 1 Byte

RegisterAddress 2 Bytes  ByteCount 1 Byte

No.OfRegisters 2 Bytes  1

RegisterValue  2 Bytes

CRCChecksum 2 Bytes  2

RegisterValue 2 Bytes

 Etc...

 CRCChecksum 2 Bytes

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Command06–WriteSingleHoldingRegister

MasterTelegram Length  SlaveResponse Length

SlaveAddress 1 Byte  SlaveAddress 1 Byte

FunctionCode(06) 1 Byte  FunctionCode(06) 1 Byte

Value 2 Bytes  RegisterValue 2 Bytes

CRCChecksum 2 Bytes  CRCChecksum 2 Bytes

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Beijer-electronics BFI-P2 V1.21 Manual de usuario Pagina 46

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