Mitsubishi Electric FR-A700 Technical Manual page 410

2.21.5 Mitsubishi inverter protocol (computer link communication)
You can perform parameter setting, monitor, etc. from the PU connector or RS-485 terminals of the inverter using the
Mitsubishi inverter protocol (computer link communication).
(1) Communication specifications
Item
Communication protocol
Conforming standard
Number of connectable devices
Communication PU connector
RS-485 terminals
speed
Control procedure
Communication method
Character system
Start bit
Stop bit length
Communication
specifications
Parity check
Error check
Terminator
Waiting time setting
(2) Communication procedure
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
unless requested.)
2) After waiting for the waiting time
3) The inverter sends return 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
communication is made properly.)
1: N (maximum 32 units), setting is 0 to 31 stations
Selectable from among 4800/9600/19200 and 38400bps
Selectable from 300, 600, 1200, 2400, 4800, 9600, 19200 and 38400bps
Check (even, odd) or no check can be selected
5) is not sent, subsequent
Description
Mitsubishi protocol (computer link)
EIA-485 (RS-485)
Asynchronous
Half-duplex
ASCII (7 bits or 8 bits can be selected)
1bit
1 bit or 2 bits can be selected
Sum code check
CR/LF (presence/absence selectable)
Selectable between presence and absence
Computer
(Data flow)
Inverter
Inverter
(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 an alarm stop if the number of
consecutive retries exceeds the parameter setting.
*2 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.
444
PARAMETER
common
(common
Parameter
When data is read
*2
1)
2) 3)
*1
When data is written
)
Related
[Pr. 551]
—
[Pr. 117]
[Pr. 331]
[Pr. 118]
[Pr. 332]
—
—
[Pr. 119]
[Pr. 333]
—
[Pr. 119]
[Pr. 333]
[Pr. 120]
[Pr. 334]
—
[Pr. 124]
[Pr. 341]
[Pr. 123]
[Pr. 337]
4) 5)
Time