Mitsubishi Electric FR-D720-0.2K-G Instruction Manual page 195

Communication operation and setting
(3) Communication operation presence/absence and data format types
Data communication between the computer and drive unit 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
1) drive unit in accordance with the user
program in the computer.
2)
drive unit data processing time
Reply data from the
3) drive unit (Data 1) is
checked for error)
4)
Computer processing delay time
Answer from
computer in response
5)
to reply data 3).
(Data 3) is checked
for error)

In the communication request data from the computer to the
 drive unit
Reply from the

When any of "0.01 to 9998" is set in Pr. 37 and "01" in instruction code, HFF sets data format to A2 or E2. In addition, data format is always A2 and E2
for read or write of Pr. 37.

At mode error, and data range error, C1 data contains an error code. (Refer to page 202.) Except for those errors, the error is returned with data format
D.
Data writing format
Communication request data from the computer to the drive unit 1)
Format
1 2 3
Drive unit
ENQ
A station


number
Drive unit
ENQ
A1 station


number
Drive unit
ENQ
A2 station


number
Drive unit
ENQ
A3 station


number
Reply data from the drive unit to the computer 3) (No data error detected)
Format
1 2 3
Drive unit
ACK
C station


number
Drive unit
STX
station
C1


number
192
Run
Command
A1
Present

No error
C
(Request
accepted)
With error
(Request D
rejected)

No error
Absent
(No drive unit
processing)
With error
(Drive unit
Absent
outputs 3)
again.)
drive unit
to the reset request can be selected. (Refer to page 198.)
4 5 6 7 8
Instruction

code
Instruction

Data
code
Instruction

code
Send Receive
Instruction

data data
code
type type
4 5 6 7 8

Send Receive
Error Error
data data
code 1 code 2
type type
Operation Multi Parameter
Speed Command Write

A3
A, A2 A, A2

Present Present Present
C C1
D D
10ms or more
Absent
Absent Absent
(C)
Absent F Absent
drive unit
, 10ms or more is also required after "no data error (ACK)". (Refer to page 194.)
Number of Characters
9 10 11 12
Sum
Data
check
Sum

check
Data
Data1
Number of Characters
9 10 11 12
Data1
Drive unit
Monitor
Reset

A B
Present Present
E, E1, E2,

C
C

E3

D D
D
Absent
Absent
(C)
Absent F
13 14 15 16 17

Sum

check
Data2
13 14 15 16 17
ETX
Data2

Parameter
Read
B
Present

E, E2
D
Absent (C)
F
18 19
Sum

check
18 19
Sum

check