Mitsubishi Electric FR-A760 Series Instruction Manual page 331

Communication operation and setting
(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:
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
321)
*2 The inverter response to the inverter reset request can be selected. (Refer to page 326)
1)Communication request data from the computer to the inverter
Format
ENQ
A
(Data write)
ENQ
A'
(Data write)
ENQ
B
(Data read)
3)Reply data from the inverter to the computer
⋅ When data is written
Format
C
ACK
(No data error detected)
D
NAK
(Data error detected)
⋅ When data is read
Format
E
STX
(No data error detected)
E'
STX
(No data error detected)
NAK
D
(Data error detected)
5)Send data from the computer to the inverter during data read
Format
C
ACK
(No data error detected)
NAK
F
(Data error detected)
*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).
320
Operation
No error
*1
(Request accepted)
With error.
(Request rejected)
No error
*1
(No inverter
processing)
With error
(Inverter re-
outputs 3))
1 2 3 4
Inverter station
Instruction code
number
*1 *2
Inverter station
Instruction code
number
*1 *2
Inverter station
Instruction code
number
*1 *2
Number of Characters
1 2 3 4
Inverter station
*4
number
*1 *2
Inverter station Error
number Code
*1 *2
1 2 3 4
Inverter station
number
*1 *2
Inverter station
Read data
number
*1 *2
Inverter station Error
number Code
*1 *2
Number of Characters
1 2 3 4
Inverter station
*4
number
*1 *2
Inverter station
*4
number
*1 *2
Run Running Parameter
Command Frequency Write
A
A
A'
Present Present Present
C C
D D
Absent Absent Absent
Absent Absent Absent
Number of Characters
5 6 7
Waiting
time
*3
Waiting
Data
time
*3
Waiting
Sum check
time
*3
5
*4
Number of Characters
5 6 7
ETX
Read data
ETX
Sum check
*1
*4
Inverter
Monitor
Reset
A A
Absent Present
C C
*2
E'
D D
*2
10ms or more
Absent
Absent
(C)
Absent
8 9 10 11
Data Sum check
Sum check
*4
*4
8 9 10 11
Sum check
*4
*1
*4
Parameter
Read
B B
Present
E
E
D D
Absent
(C)
F F
12 13
*4