Mitsubishi Inverter Protocol (Computer Link Communication) - Mitsubishi Electric FR-D720-008 Instruction Manual

Communication operation and setting

4.19.5 Mitsubishi inverter protocol (computer link communication)

You can perform parameter setting, monitoring, etc. from the PU connector of the inverter using the Mitsubishi inverter
protocol (computer link communication).
(1) Communication
The communication specifications are given below.
Item
Communication protocol
Conforming standard
Number of connectable devices
Communication
PU connector
speed
Control procedure
Communication method
Character system
Start bit
Stop bit length
Communication
Parity check
Error check
Terminator
Waiting time setting
(2) Communication procedure
Computer
(Data flow)
Inverter
Inverter
*1
(Data flow)
Computer
∗1
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.
∗2
On receipt of a data error occurrence, the inverter returns reply data 3) to the computer again. The inverter comes to trip if the number of consecutive data
errors reaches or exceeds the parameter setting.
186
1:N (maximum 32 units), setting is 0 to 31 stations
Selected from among 4800/9600/19200 and 38400bps
ASCII (7 bits or 8 bits can be selected)
Check (even, odd) or no check can be selected
Selectable between presence and absence
When data is read
*2
1) 4)
2) 3)
When data is written
Description
Mitsubishi protocol (computer link)
EIA-485 (RS-485)
Asynchronous
Half-duplex
1bit
1 bit or 2 bits can be selected
Sum code check
CR/LF (presence/absence selectable)
Data communication between the computer and
inverter is made in the following procedure.
1) Request data is sent from the computer to
5)
the inverter. (The inverter will not send data
Time
unless requested.)
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
time
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.)
Related
Parameter
Pr. 549
—
Pr. 117
Pr. 118
—
—
Pr. 119
—
Pr. 119
Pr. 120
—
Pr. 124
Pr. 123