(N) Operation via communication and its settings
119
5
GROUP
N
5.7.4
Mitsubishi inverter protocol (computer link
communication)
Communication specifications
• The communication specifications are given below.
Communication procedure
• Data communication between the computer and the converter unit is made in the following procedure.
(a)
Request data is sent from the computer to the converter unit. (The converter unit will not send data unless requested.)
(b)
After waiting for the waiting time,
(c)
The converter unit sends reply data to the computer in response to the computer request.
(d)
After waiting for the converter unit data processing time,
(e)
An answer from the computer in response to reply data
(c)
of the converter unit is transmitted. (Even if
(e)
is not sent,
subsequent communication is made properly.)
If a data error is detected and a retry must be made, perform retry operation with the user program. The converter unit output is shut off when the
number of consecutive retries exceeds the parameter setting.
On receipt of a data error occurrence, the converter unit returns reply data
(c)
to the computer again. The converter unit output is shut off when
the number of consecutive data errors exceeds the parameter setting.
Parameter settings and monitoring are possible by using the Mitsubishi inverter protocol (computer link communication)
via inverter PU connector.
Item
Description
Related
parameter
Communication protocol
Mitsubishi protocol (computer link)
—
Conforming standard
EIA-485 (RS-485)
—
Connectable units
1:N (maximum 32 units), setting is 0 to 31 stations
Pr.117
Communication speed
Selected among 4800/9600/19200/38400 bps
Pr.118
Control procedure
Start-stop synchronization method
—
Communication method
Half-duplex system
—
Communication
specifications
Character system
ASCII (7 bits or 8 bits can be selected.)
Pr.119
Start bit
1 bit
—
Stop bit length
1 bit or 2 bits can be selected.
Pr.119
Parity check
Check (even or odd) or no check can be selected.
Pr.120
Error check
Sum code check
—
Terminator
CR/LF (presence/absence selectable)
Pr.124
Waiting time setting
Selectable between presence and absence
Pr.123
When data is read
When data is written
a
e
d
c
b
∗2
Computer
↓ (Data flow)
Converter unit
Converter unit
Computer
↓ (Data flow)
Time
∗1
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