Communication operation and setting
1) Control code
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 62)
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 62)
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).
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 223)
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.
When the Pr. 123 Waiting time setting
data without "waiting time" in the data format. (The number of characters decreases by 1.)
Start of Text (Start of data)
End of Text (End of data)
Enquiry (Communication request)
Acknowledge (No data error detected)
Negative Acknowledge (Data error detected)
Inverter data processing time
= Waiting time
H30 H37 H41 H44 H46 H34
"9999", create the communication request
H30 H03 H33 H30
+ Data check time
(About 10 to 30ms, which
depends on the instruction code)