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• Instruction code
Specify the processing request, for example, operation or monitoring, given by the computer to the inverter. Therefore, the
operation or monitoring an item is enabled by specifying the corresponding instruction code. (Refer to
• Data
Read/write data such as parameters transmitted from/to the inverter. The definitions and ranges of set data are determined
in accordance with the instruction codes. (Refer to
• Time delay
Specify the delay time (time period between the time when the inverter receives data from the computer and the time when
the inverter starts transmission of reply data). Set the delay time in accordance with the response time of the computer in
the range of 0 to 150 ms in 10 ms increments. (For example, "1" for 10 ms or "2" for 20 ms.)
When Pr.123 PU communication waiting time setting or Pr.337 RS-485 communication waiting time setting is set
to other than "9999", create the communication request data without "delay time" in the data format. (The number of
characters decreases by 1.)
Computer
Inverter
Inverter
Computer
*1
Number set in data × 10 (ms) when Pr.123 = "9999". Pr.123 setting (ms) when Pr.123 ≠ "9999".
*2
About 10 to 30 ms. It varies depending on the instruction code.
NOTE
• The data check time varies depending on the instruction code. (Refer to
• Sum check code
The sum check code is a 2-digit ASCII (hexadecimal) representing the lower 1 byte (8 bits) of the sum derived from the
checked ASCII data.
(Example 1)
Computer
ASCII Code
* When the Pr.123 or Pr.337 (Waiting time setting)
data without "waiting time" in the data format. (The number of characters decreases by 1.)
(Example 2)
Inverter
Computer
ASCII Code
488
5. PARAMETERS
5.12 (N) Communication operation parameters
Instruction
ENQ
Station
code
Inverter
number
0
1
E
H05
H30 H31
H45 H31
H30+H31+H45+H31+H31+H30+H37+H41+H44
= H1F4
Sum
Station
STX
number
0
1
1
H02
H30 H31
H31 H37
H30+H31+H31+H37+H37+H30
= H130
Sum
page
493.)
Inverter data processing time
=
Data
1
1
0
7
A
D
H31
H30 H37 H41 H44 H46 H34
"9999", create the communication request
Sum
Data read
ETX
check
code
7
7
0
3
0
H37
H30 H03 H33 H30
Waiting time*1
+
data check time*2
page
489.)
Sum
check
code
F
4
Binary code
Binary code
page
493.)

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