Mitsubishi Electric FR-A720-0.4K Instruction Manual page 327

(3) 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:
Operation
Symbol
Communication request is sent to the
1) inverter in accordance with the user
program in the computer.
2) Inverter data processing time
Reply data from the
3)
inverter (Data 1) is
checked for error)
4)
Computer processing delay time
Answer from computer in
response to reply data 3)
5)
(Data 3) is checked for
error)
*1 In the communication request data from the computer to the inverter, 10ms or more is also required after "no data error (ACK)". (Refer to page
318)
*2 The inverter response to the inverter reset request can be selected. (Refer to page 322)
1)Communication request data from the computer to the inverter
Format
1
A ENQ
(Data write)
*1
A' ENQ
(Data write)
*1
ENQ
B
(Data read)
*1
3)Reply data from the inverter to the computer
⋅ When data is written
Format
1
C
ACK
(No data error detected)
*1
D
NAK
(Data error detected)
*1
⋅ When data is read
Format
1
E
STX
(No data error detected)
*1
E'
STX
(No data error detected)
*1
D NAK
(Data error detected)
*1
5)Send data from the computer to the inverter during data read
Number of Characters
Format
1
C
ACK
(No data error detected)
*1
F NAK
(Data error detected)
*1
*1 Indicate a control code
*2 Specify the inverter station numbers between H00 and H1F (stations 0 to 31) in hexadecimal.
When Pr. 123, Pr. 337 (waiting time setting) ≠ "9999", create the communication request data without "waiting time" in the data format. (The number
*3
of characters decreases by 1.)
*4 CR, LF code
When data is transmitted from the computer to the inverter, CR (carriage return) and LF (line feed) codes are automatically set at the end of a data
group on some computers. In this case, setting must also be 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 presence/absence selection).
Run
Command
A
A'
Present
No error
*1
C
(Request accepted)
With error.
D
(Request rejected)
Absent
No error
*1
Absent
(No inverter
processing)
With error
(Inverter re- Absent
outputs 3))
2 3 4 5
Inverter station
Instruction code
number
*2
Inverter station
Instruction code
number
*2
Inverter station
Instruction code
number
*2
Number of Characters
2 3 4 5
Inverter station
*4
number
*2
Inverter station Error
*4
number Code
*2
Number of Characters
2 3 4 5
Inverter station
Read data
number
*2
Inverter station
Read data
number
*2
Inverter station Error
*4
number Code
*2
2 3 4
Inverter station
*4
number
*2
Inverter station
*4
number
*2
Communication operation and setting
Running Parameter
Frequency Write
A A
Present Present
C C
D D
Absent Absent
Absent Absent
Absent Absent
Number of Characters
6 7 8 9
Waiting
Data
time
*3
Waiting
Data Sum check
time
*3
Waiting
Sum check
*4
time
*3
6 7 8 9
ETX
Sum check
*1
ETX
Sum check
*4
*1
Inverter Parameter
Monitor
Reset Read
A B B
Absent Present Present
E
C E
*2
E'
D D D
*2
Absent Absent Absent
Absent Absent
Absent
(C) (C)
Absent F F
10 11 12 13
Sum check
*4
10 11
*4
*4
4
317