Mitsubishi Electric FR-F720P-0.75K to 110K Instruction Manual page 247

Communication operation and setting
Data reading format
Communication request data from the computer to the inverter 1)
Format
1 2
ENQ
B
station number
*1
Reply data from the inverter to the computer 3) (No data error detected)
Format
1 2
STX
E
station number
*1
STX
E1
station number
*1
STX
E2
station number
*1
Format
1 2
STX
E3
*1 station number
Reply data from the inverter to the computer 3) (With data error)
Number of Characters
Format
1 2
NAK
D
station number
*1
Send data from the computer to the inverter 5)
Number of Characters
Format
1 2
C
ACK
(Without
station number
*1
data error)
F
NAK
(With data
station number
*1
error)
*1 Indicate a control code
*2 Specify the inverter station numbers between H00 and H1F (stations 0 to 31) in hexadecimal.
*3 When Pr.123 and Pr.337 (Waiting time setting)
number of characters decreases by 1.)
*4 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, Pr. 341 (CR/LF selection).
236
Number of Characters
3 4 5
Inverter
Instruction code
*2
3 4 5
Inverter
Read data
*2
Inverter
Read data
*2
Inverter
*2
3
Inverter
Read data (Inverter model information)
*2
3 4 5
Inverter Error
*4
code
*2
3 4
Inverter
*4
*2
Inverter
*4
*2
≠
9999, create a communication request data without "waiting time" in the data format. (The
6 7 8
Sum
*3
check
Number of Characters
6 7 8
ETX
*1
ETX
Sum
check
*1
Read data
Number of Characters
4 to 23
9
*4
9 10 11 12
Sum
*4
check
*4
ETX Sum
check
*1
24 25 26
ETX Sum
*1 check
13
*4
27
*4