Hitachi WJ200 Series

B−5
Network Protocol Reference
Transmission procedure
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:
Frame Format
Header (silent interval)
Slave address
Function code
Data
Error check
Trailer (silent interval)