76 Serial Communications
Modbus Telegram Structure
The following Modbus RTU Commands are supported
• 03 Read Holding Registers
• 06 Write Single Holding Register
The telegram structure is as follows:
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
1st Register Address
2
Bytes
Data Length
2
Bytes
No. Of Registers
2
Bytes
1st Register Value
2
Bytes
CRC Checksum
2
Bytes
2nd Register Value
Etc...
CRC Checksum
2
Bytes
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
Register Address
2
Bytes
Register Address
2
Bytes
Value
2
Bytes
Register Value
2
Bytes
CRC Checksum
2
Bytes
CRC Checksum
2
Bytes
ACS260-04.book Page 76 Thursday, December 24, 2020 4:33 PM
Summary of Contents for ACS260-04 Series
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