Beijer-electronics AN-BEI-P2-038 Manuale Utente Scaricare il pdf (Pagina 2)

APPLICATIONNOTEAN‐BEI‐P2‐038 Date:15/02/12

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AN‐BEI‐P2‐038ModbusRTUControlandRegisterMapping

2

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ModbusTelegramStructure:

ThefollowingModbusCommandsaresupported

• 03ReadHoldingRegisters

• 06WriteSingleHoldingRegister

Thetelegramstructureisasfollows:‐

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Command03–ReadHoldingRegisters Command06–WriteSingleHoldingRegister

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

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

FunctionCode(03) 1 Byte  FunctionCode(03) 1 Byte FunctionCode(06) 1 ByteFunctionCode(06) 1 Byte

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

No.OfRegisters 2 Bytes  1stRegisterValue 2 Bytes Value 2 BytesRegisterValue 2 Bytes

CRCChecksum 2 Bytes  2ndRegisterValue 2 Bytes CRCChecksum 2 BytesCRCChecksum 2 Bytes

 Etc...

 CRCChecksum 2 Bytes 

RJ45DataConnectionPinConfiguration:

CAN‐

CAN+

0Volt

Intbus/RemoteKeypad/PCConnection‐

Intbus/RemoteKeypad/PCConnection+

+24VoltRemoteKeypadPowerSupply

RS485‐ModbusRTU

RS485+ModbusRTU

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TypicalMODBUSconfiguration:

1 2 3 4 5 6 7 ... 15 16

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Beijer-electronics AN-BEI-P2-038 Manuale Utente Pagina 2