Mitsubishi Electric FR-A520-0.4K Instruction Manual page 142

2) Reply data from inverter to computer during data write
[No data error detected]
*1
Format C
ACK
1
3) Reply data from inverter to computer during data read
[No data error detected]
*2 Inverter
*1
Format E station
STX
number
1 2
*2 Inverter
*1
Format E'
station
STX
number
1 2
4) Send data from computer to inverter during data read
[No data error detected]
Format G
*1 Indicates the control code.
*2 The inverter station numbers may be set between H00 and H1F (stations 0 to 31) in hexadecimal.
*3 When Pr. 123 "waiting time setting"
time" in the data format. (The number of characters decreases by 1.)
*4 Indicates the CR or 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 from the inverter according to the computer.
Also, the presence and absence of the CR and LF codes can be selected using Pr. 124
(4) Data definitions
1) Control codes
Signal ASCII Code
STX H02
ETX H03
ENQ H05
ACK H06
LF H0A
CR H0D
NAK H15
2) Inverter station number
Specify the station number of the inverter which communicates with the computer.
3) Instruction code
Specify the processing request (e.g. operation, monitoring) given by the computer to the inverter. Hence,
the inverter can be run and monitored in various ways by specifying the instruction code as appropriate.
(Refer to page 240.)
4) Data
Indicates the data such as frequency and parameters transferred to and from the inverter. The definitions
and ranges of set data are determined in accordance with the instruction codes. (Refer to page 240.)
[Data error detected]
*2 Inverter
*4
station
number
←Number of characters
2 3 4
*1
Read data
ETX
3 4 5 6 7 8 9
Read *1
Sum
*4
data ETX
check
3 4 5 6 7 8 9
*2 Inverter
*1
station *4
ACK
number
←Number of characters
1 2 3 4
≠
"9999", create the communication request data with no "waiting
Description
Start of Text (Start of data)
End of Text (End of data)
Enquiry (Communication request)
Acknowledge (No data error detected)
Line Feed
Carriage Return
Negative Acknowledge (Data error detected)
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*2 Inverter
*3
Error
Format D
station
NAK
code
number
1 2 3
[Data error detected]
Sum
Format F
*4
check
10 11
←Number of characters
[Data error detected]
*2 Inverter
*1
Format H
station
NAK
number
1 2 3
133
PARAMETERS
*4
←Number of characters
4 5
*2 Inverter
*1 Error
*4
station
NAK code
number
1 2 3 4 5
*4
←Number of characters
4
4