Mitsubishi Electric FR-D720-008 Instruction Manual page 196

Communication operation and setting
General flowchart
Always set the communication check time interval before starting operation to prevent hazardous conditions.
Data communication is not started automatically but is made only once when the computer provides a
communication request. If communication is disabled during operation due to signal cable breakage etc., the
inverter cannot be stopped. When the communication check time interval has elapsed, the inverter will come
to trip (E.PUE, E.SER).
The inverter can be coasted to a stop by switching ON its RES signal or by switching power OFF.
If communication is broken due to signal cable breakage, computer fault etc., the inverter does not detect
such a fault. This should be fully noted.
192
Port open
Communication setting
Time out setting
Send data processing
Data setting
Sum code calculation
Data transmission
Receive data waiting
Receive data processing
Data retrieval
Screen display
CAUTION