Mitsubishi Electric FR-E720-600 Instruction Manual page 211

(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:
No. Operation
Communication request is sent to the inverter in
1) 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 211)
∗2
Reply from the inverter to the inverter reset request can be selected. (Refer to page 215)
∗3
When any of "0.01 to 9998" is set in Pr. 37 and "01" in instruction code HFF sets data format to "A" or "E". In addition, data format is always A" and E"
for read or write of Pr. 37.
1) Communication request data from the computer to the inverter
Format
1
A
ENQ
station number
∗1
(Data write)
A'
ENQ
station number
∗1
(Data write)
A"
ENQ
station number
∗1
(Data write)
B
ENQ
station number
∗1
(Data read)
3) Reply data from the inverter to the computer
When data is written
Format
1
C
ACK
∗1
(Without data error)
D
NAK
∗1
(With data error)
When data is read
Format
1
E
STX
∗1
(Without data error)
E'
STX
∗1
(Without data error)
E "
STX
∗1
(Without data error)
D
NAK
∗1
(With data error)
Command
Present
No error ∗1
(Request accepted)
With error.
(Request rejected)
Absent
No error ∗1
Absent
(No inverter
processing)
With error.
(Inverter outputs 3) Absent
again.)
2 3 4 5
Inverter
Waiting
Instruction
Time
code
∗3
∗2
Inverter
Waiting
Instruction
Time
code
∗3
∗2
Inverter
Waiting
Instruction
Time
code
∗3
∗2
Inverter
Waiting
Instruction
Time
code
∗3
∗2
Number of Characters
2 3 4
Inverter
∗4
station number
∗2
Inverter
Error
station number
code
∗2
2 3 4
Inverter
station number
∗2
Inverter
station number Read data
∗2
Inverter
station number
∗2
Inverter
Error
station number
code
∗2
Communication operation and setting
Run Operation Parameter
Frequency Write
A, A" ∗3 A, A" ∗3
A'
Present Present
C C C
D D D
Absent Absent
Absent Absent
Absent Absent
Number of Characters
6 7 8 9 10
Data
Sum
Data
check
Data
Sum
∗4
check
5
∗4
Number of Characters
5 6 7 8
ETX
Read data
∗1
ETX
Sum
∗1
check
Read data
∗4
Inverter Parameter
Monitor
Reset Read
A B
Absent Present Present
C ∗2 E, E', E" ∗3 E, E" ∗3
D ∗2
D
Absent Absent Absent
Absent Absent (C) Absent (C)
Absent F
11 12 13 14
Sum
∗4
check
∗4
Sum
check
9 10 11 12
Sum
∗4
check
∗4
ETX
Sum
∗1
check
B
D
F
15
∗4
4
13
∗4
209