Owner's manual

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: