Hitachi L200 Manual Do Utilizador

Network Protocol Reference

Appendix B

• A time period between reception of a query from the master and transmission of a 

response from the inverter is the sum of the silent interval (3.5 characters long) + C078 
(transmission latency time).

• The master must provide a time period of the silent interval (3.5 characters long or 

longer) before sending another query to an inverter after receiving a response from the 
inverter.

• When receiving a query that contains a function code of Loopback (08h), the inverter 

returns a response of the same content of the query.

• When receiving a query that contains a function code of Write in Register or Coil 

(05h, 06h, 0Fh, or 10h), the inverter directly returns the query as a response.

• When receiving a query that contains a function code of Read Register or Coil (01h or 

03h), the inverter returns, as a response, the read data together with the same slave 
address and function code as those of the query.

• When finding any error in a query (except for a transmission error), the inverter 

returns an exception response without executing anything.

• You can check the error by the function code in the response. The function code of the 

exception response is the sum of the function code of the query and 80h.

• The content of the error is known from the exception code.   

Slave address

Function code

Exception code

CRC–16

0 1 h

The specified function is not supported

0 2 h

The specified address is not found.

0 3 h

The format of the specified data is not acceptable.

2 1 h

The data to be written in a holding register is outside the inverter.

2 2 h

The specified functions are not available to the inverter.

Function to change the content of a register that cannot be changed while the 
inverter is in service

Function to submit an ENTER command during running (UV)

Function to write in a register during tripping (UV)

Function to write in a read-only register (or coil)