Hitachi L200 Manual Do Utilizador

Network Protocol Reference

Appendix B

The transmission between the external control equipment and the inverter takes the 
procedure below

• Query - A frame sent from the external control equipment to the inverter 

• Response - A frame returned from inverter to the external control equipment 

The inverter returns the response only after the inverter receives a query from the 
external control equipment and does not output the response positively. Each frame is 
formatted (with commands) as follows:

Slave address: 

• This is a number of 1 to 32 assigned to each inverter (slave). (Only the inverter having 

the address given as a slave address in the query can receive the query.)

• When slave address “0” is specified, the query can be addressed to all inverters simul-

taneously. (Broadcasting) 

• In broadcasting, you cannot call and loop back data.

Header (silent interval)

Slave address

Function code

Data

Error check

trailer (silent interval)

Query

t

External control 

equipment

Response

Inverter

Latency time

(silent interval plus C078 setting)