Mitsubishi FR-A800

(N) Operation via communication and its settings
566
PARAMETERS
Communication operation presence/absence and data format types
• Data communication between the computer and inverter is made in ASCII code (hexadecimal code).
• Communication operation presence/absence and data format types are as follows.
• Data writing format
a. Communication request data from the computer to the inverter
c. Reply data from the inverter to the computer (No data error detected)
c. Reply data from the inverter to the computer(Data error detected)
 Indicates a control code.
 Specifies the inverter station numbers in the range of H00 to H1F (stations 0 to 31) in hexadecimal.
 When Pr.123 or Pr.337 (Waiting time setting)  9999, create a communication request data without "waiting time" in the data format. (The
number of characters decreases by 1.)
 CR, LF code: When data is transmitted from the computer to the inverter, codes CR (carriage return) and LF (line feed) are automatically set at
the end of a data group on some computers. In this case, setting must be also made on the inverter according to the computer. Whether the CR
and LF codes will be present or absent can be selected using Pr.124 or Pr.341 (CR/LF selection).
Symbol Operation
Operation
command
Operation
frequency
Multi
command
Parameter
write
Inverter
reset
Monitor
Parameter
read
a
Communication request is
sent to the inverter in
accordance with the user
program in the computer.
A, A1 A A2 A A B B
b Inverter data processing time With With With With Without With With
c
Reply data
from the
inverter (Data
(a) is checked
for an error)
No error

(Request
accepted)
CCC1 CC
E, E1,
E2, E3
E
With error
(Request
rejected)
DDDD D
 DD
d
Computer processing delay
time
10 ms or more
e
Answer from
computer in
response to
reply data c
(Data c is
checked for
error)
No error

(No inverter
processing)
Without Without Without (C) Without Without
Without
(C)
Without (C)
With error
(Inverter
outputs c
again.)
Without Without F Without Without F F
 In the communication request data from the computer to the inverter, 10 ms or more is also required after "no data error (ACK)". (Refer to page
569
.)
 Reply from the inverter to the inverter reset request can be selected. (Refer to page 574.)
 At mode error, and data range error, C1 data contains an error code. (Refer to page 578) Except for those errors, the error is returned with
data format D.
Format
Number of characters
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
A
ENQ

Inverter station
No.

Instruction
code
 Data Sum check 
A1
ENQ

Inverter station
No.

Instruction
code
 Data Sum check 
A2
ENQ

Inverter station
No.

Instruction
code

Send
data
type
Receive
data
type
Data1 Data2 Sum check 
Format
Number of characters
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
C
ACK

Inverter station
No.


C1
STX

Inverter station
No.

Send
data
type
Receive
data
type
Error
code
1
Error
code
2
Data1 Data2
ETX

Sum check 
Format
Number of characters
1 2 3 4 5
DNAK
Inverter station
No.

Error
code
