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Modbus RTU Function 10 - Preset Multiple Registers

 
The Modbus Function 10 is used to Preset Multiple Registers (4x references) in a Modbus Slave device. Registers are addressed starting at zero: meaning Register 5 is addressed as 4. The Preset data values written in to a Modbus register are 16-bit values.

Command: 01 10 00 04 00 02 04 79 02 87 FE CRC1 CRC2
Response: 01 10 00 04 00 02           CRC1 CRC2

Command Usage:

Address01 - One Byte Slave Address
Function10 - One Byte Function Number
Start Addr HI00 - Starting Register Address HI Byte
Start Addr LO04 - Starting Register Address LO Byte (40005)
Reg Qty HI00 - Quantity of Registers to Write HI Byte
Reg Qty LO02 - Quantity of Registers to Write LO Byte
Data Bytes02 - Quantity of Data Bytes to Write
Data Reg 1 HI79 - First Register HI Byte
Data Reg 1 LO02 - First Register LO Byte
Data Reg 2 HI87 - Second Register HI Byte
Data Reg 2 HIFE - Second Register LO Byte
ChecksumTwo Byte CRC

Response Message:

Address01 - One Byte Slave Address
Function10 - One Byte Function Number
Start Addr HI00 - Starting Register Address HI Byte
Start Addr LO04 - Starting Register Address LO Byte
Reg Qty HI00 - Quantity of Registers to Write HI Byte
Reg Qty LO02 - Quantity of Registers to Write LO Byte
ChecksumTwo Byte CRC
  
Finally, when specifying Modbus hardware or software, take a moment to review the documentation for each item and ensure that both the hardware and software will support the necessary functions to operate properly. It is a rare event that there will be problems but this review process will eliminate the possibility of surprises later.

Return to Modbus Overview
Modbus Exception/Error Codes

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