Mitsubishi Electric FR-E720-008 Instruction Manual page 221

(4) Data definitions
1) Control code
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 or 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 60)
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 60)
5) Waiting time
Specify the waiting time between the receipt of data at the inverter from the computer and the transmission of reply data.
Set the waiting time in accordance with the response time of the computer between 0 and 150ms in 10ms increments.
(e.g. 1 = 10ms, 2 = 20ms).
Computer
Inverter
Inverter
Computer
REMARKS
When the Pr. 123, Pr. 337 (waiting time setting) setting is other than 9999, create the communication request data without "waiting
time" in the data format. (The number of characters decreases by 1.)
The data check time changes depending on the instruction code. (Refer to page 222)
6) Sum check code
The sum check code is 2-digit ASCII (hexadecimal) representing the lower 1 byte (8 bits) of the sum (binary) derived
from the checked ASCII data.
(Example 1)
Computer
ASCII Code
∗
When the Pr. 123 Waiting time setting
data without "waiting time" in the data format. (The number of characters decreases by 1.)
(Example 2)
Inverter
ASCII Code
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)
Station
Instruction
ENQ
Inverter
number
0 1 E
H05 H30 H31 H45 H31
H30+H31+H45+H31+H31+H30+H37+H41+H44
=H1F4
Sum
= "9999", create the communication request
Station
STX
Computer
number
0 1 1
H02 H30 H31 H31 H37
H30+H31+H31+H37+H37+H30
= H130
Sum
Communication operation and setting
Description
Inverter data processing time
= Waiting time
(Setting 10ms)
Data
code
1 1 0 7 A D
H31 H30 H37 H41 H44 H46 H34
Sum
ETX
check
Data read
code
7 7 0 3 0
H37 H30 H03 H33 H30
+ Data check time
(About 10 to 30ms, which
depends on the instruction code)
Sum
check
code
F 4
Binary code
Binary code
4
221