7 Modbus RTU
7.4 Operating mode Modbus RTU
DE1 variable speed starter
09/14 MN040011EN
www.eaton.com
127
7.4.4.2 Function code 06
hex
: Writing a holding register
This function writes data to a holding register.
Example
Writing of the control word (ID 1) of a DE1 variable speed starter with the
slave address 1.
Master request: 01 06 0000 0001 480A
hex
Slave response: 01 06 0000 0001 480
hex
The slave response is a copy of the master request if it is a normal response.
Register [hex]
Name
01
Slave address
06
Function code (writing a holding register)
0000
0: The ID of the register for the writing operation is 1, since the master controller has an
offset of +1.
0001
Content (2 byte) for register 0000 0000 0000 001
bin
→
RUN
480A
CRC
Register [hex]
Name
01
Slave address
06
Function code (here. Writing of a holding register)
0000
1: The ID of the register for the writing operation is 1, since the master controller has an
offset of +1.
0001
Content (2 byte) for register 0000 0000 0000 001
bin
→
RUN
B844
CRC
→
Function code 06
hex
can be used for a broadcast.