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Communication operation and setting
(4) Data definitions
1) Control codes
Signal Name ASCII Code
STX
ETX
ENQ
ACK
LF
CR
NAK
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
444)
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 444)
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 Pr. 123, Pr. 337 (waiting time setting)
format. (The number of characters decreases by 1.)
⋅ The data check time changes depending on the instruction code. (Refer to page 325)
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
324
H02
Start Of Text (start of data)
H03
End Of Text (end of data)
H05
Enquiry (communication request)
H06
Acknowledge (no data error detected)
H0A
Line Feed
H0D
Carriage Return
H15
Negative Acknowledge (data error detected)
≠ "
9999
, create the communication request data without "waiting time" in the data
"
ENQ
Station
Inverter
number
0
1
H05
H30 H31
H
H
H
+
+
30 31 45 31 31 30 37 41 44
H
= 1F4
Sum
"9999", create the communication request
Station
STX
Computer
number
0
1
H02
H30 H31
H
H
H
30 31 31 37 37 30
+
+
H
= 130
Sum
Description
Inverter data processing time
=
Instruction
Data
code
E
1
1
0
7
A
H45 H31
H31
H30 H37 H41 H44 H46 H34
H
H
H
H
H
H
+
+
+
+
+
+
Sum
Data read
ETX
check
code
1
7
7
0
3
H31 H37
H37
H30 H03 H33 H30
H
H
H
+
+
+
Waiting time
+
data check time
(setting 10ms)
(About 10 to 30ms,
which depends on the
instruction code)
Sum
check
code
D
F
4
Binary code
0
Binary code
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