Eaton DC1-124D1FN-A20N - Explanation of Function Code

7 Serial interface (Modbus RTU)
7.3 Operating mode Modbus RTU
DC1 Frequency Inverter 10/12 MN04020003Z-EN www.eaton.com 153
7.3.4 Explanation of function code
7.3.4.1 Function code 03
hex
: Reading of holding registers
This function reads the content of a number of consecutive holding registers
(specified register addresses).
Example
Reading the status and fault word (ID 6) of the DC1 frequency inverter with
slave address 1.
Master request: 01 03 0005 0001 940B
hex
Slave response: 01 03 02 0000 B844
hex
hex Name
01 Station address
03
Function code (reading of holding registers)
0005
5
dez
: The ID is 6, since the master controller has an offset of +1.
0001
Total number of requested registers
C940 CRC
hex
Name
01 Station address
03 Function code (reading of holding registers)
02 Number of consecutive data bytes (1 register = 2 byte)
0000 Content (2 byte) for register 6: 0
B844 CRC