Mitsubishi Electric FR-D720S SC EC Instruction Manual page 358

Communication operation and settings
● Data reading format
Communication request data from the computer to the inverter
Format
B
Reply data from the inverter to the computer
Format
E
E1
E2
Format
E3
Reply data from the inverter to the computer
Format
D
Send data from the computer to the inverter during data read
Format
C
(No data
error
detected)
F
(Data error
detected)
Indicate a control code (Refer to Tab. 6-53.)
Specify the inverter station numbers between H00 and H1F (stations 0 to 31) in hexadecimal.
Set waiting time.
When Pr. 123 "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, codes CR (carriage return) and
LF (line feed) 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 "CR, LF selection"
6 - 208
Number of Characters
1 2 3 4
Inverter
Instruction
ENQ station
number
1 2 3 4
Inverter
STX station
number
Inverter
STX station Read data
number
Inverter
STX station
number
1 2 3
Inverter
STX station
number
Number of Characters
1 2 3 4
Inverter
Error
NAK station
code
number
Number of Characters
1 2 3 4
Inverter
ACK station
number
Inverter
NAK station
number
5 6 7
Waiting
Sum check
code
time
(no data error detected)
Number of Characters
5 6 7
Read data ETX
ETX Sum check
Read data
Number of Characters
4 to 23
Read data (Inverter type information)
(data error detected)
5
8 9
8 9 10 11
Sum check
ETX Sum check
24 25
ETX Sum check
Parameter
12 13
26 27