Mitsubishi Inverter Protocol (Computer Link Communication) - Mitsubishi Electric FR-D720-0.2K-G Instruction Manual

4.17.5 Mitsubishi inverter protocol (computer link communication)

You can perform parameter setting, monitoring, etc. from the PU connector of the drive unit 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)
Drive unit 1)
Drive unit
*1
(Data flow)
Computer

If a data error is detected and a retry must be made, execute retry operation with the user program. The drive unit comes to trip if the number of consecutive
retries exceeds the parameter setting.

On receipt of a data error occurrence, the drive unit returns reply data 3) to the computer again. The drive unit comes to trip if the number of consecutive
data errors reaches or exceeds the parameter setting.
Mitsubishi inverter 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
*2
4) 5)
2) 3)
When data is written
Communication operation and setting
Description
EIA-485 (RS-485)
Asynchronous
Half-duplex
1 bit
1 bit or 2 bits can be selected
Sum code check
 Data communication between the computer and
drive unit is made in the following procedure.
1) Request data is sent from the computer to
the drive unit. (The drive unit will not send
Time
data unless requested.)
2) After waiting for the waiting time
3) The drive unit sends reply data to the
computer in response to the computer
request.
4) After waiting for the drive unit data
processing time
5) Answer from the computer in response to
reply data 3) of the drive unit 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
4
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