Mitsubishi Electric FR-F740 EC Instruction Manual page 420

Communication operation and setting
● Data writing format
Communication request data from the computer to the inverter
Format
A
A1
A2
Reply data from the inverter to the computer
Format
C
C1
Reply data from the inverter to the computer
Format
D
Indicate a control code (Refer to Tab. 6-62.)
Specify the inverter station numbers between H00 and H1F (stations 0 to 31) in hexadecimal.
When Pr. 123 or Pr. 337 "Waiting time setting" ≠ 9999, create the 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, 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 "PU
communication CR/LF selection".
6 - 270
1 2 3 4 5
ENQ Inverter
Instruction
station
code
tme
number
ENQ Inverter
Instruction
station
code
tme
number
Inverter
ENQ Instruction
station
code
tme
number
1 2 3 4 5
Inverter
ACK
station
number
Inverter Recei
Send
ACK
ve
station
data
data
type
number
type
Number of Characters
1 2 3 4 5
Inverter
NAK Error
station
code
number
Number of Characters
6 7 8 9 10
Wai-
Data
ting
Wai-
Sum
ting Data
check
Recei-
Wai-
Send
ve
ting Data 1
data
data
type
type
(no data error detected)
Number of Characters
6 7 8 9 10
Error Error
Data 1
code 1 code 2
(data error detected)
11 12 13 14 15 16
Sum
check
Data 2
11 12 13 14 15 16
ETX
Data 2
Parameter
17 18 19
Sum
check
17 18 19
Sum
check