4.20.5 Mitsubishi inverter protocol (computer link communication)
You can perform parameter setting, monitor, etc. from the PU connector of the inverter using the Mitsubishi inverter
protocol (computer link communication).
The communication specifications are given below.
Number of connectable devices
Stop bit length
Waiting time setting
If a data error is detected and a retry must be made, execute retry operation with the user program. The inverter comes to trip if the number of consecutive
retries exceeds the parameter setting.
On receipt of a data error occurrence, the inverter returns retry data 3) to the computer again. The inverter comes to trip if the number of consecutive data
errors reaches or exceeds the parameter setting.
Mitsubishi protocol (computer link)
1:N (maximum 32 units), setting is 0 to 31 stations
Selected among 4800/9600/19200/38400bps
ASCII (7 bits or 8 bits can be selected)
Check (with even or odd parity) or no check can be selected
CR/LF (presence/absence selectable)
Selectable between presence and absence
When data is read
When data is written
Communication operation and setting
1 bit or 2 bits can be selected
Sum code check
Data communication between the computer and
inverter is made in the following procedure.
1) Request data is sent from the computer to
the inverter. (The inverter will not send data
2) After waiting for the waiting time
3) The inverter sends reply data to the computer
in response to the computer request.
4) After waiting for the inverter data processing
5) Answer from the computer in response to
reply data 3) of the inverter is transmitted.
(Even if 5) is not sent, subsequent
communication is made properly.)