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Communication operation and setting
(4) Data definitions
1) Control code
2) Drive unit station number
Specify the station number of the drive unit which communicates with the computer.
3) Instruction code
Specify the processing request, e.g. operation or monitoring, given by the computer to the drive unit. Hence, the drive
unit can be run and monitored in various ways by specifying the instruction code as appropriate. (Refer to page 52)
4) Data
Indicates the data such as speed and parameters transferred to and from the drive unit. The definitions and ranges of
set data are determined in accordance with the instruction codes. (Refer to page 52)
5) Waiting time
Specify the waiting time between the receipt of data at the drive unit 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).
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.
Signal ASCII Code Description
STX H02 Start Of Text (Start of data)
ETX H03 End Of Text (End of data)
ENQ H05 Enquiry (Communication request)
ACK H06 Acknowledge (No data error detected)
LF H0A Line Feed
CR H0D Carriage Return
NAK H15 Negative Acknowledge (Data error detected)
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 213)
Computer
Drive unit
Drive unit
Computer
Drive unit data processing time
= Waiting time
(Setting 10ms)
+ Data check time
(About 10 to 30ms, which
depends on the instruction code)
(Example 1)
Computer Drive unit
ENQ
∗
Waiting
time
1
Instruction
code
Station
number
0
1
Data
Sum
check
code
E1 07ADF4
H05 H30 H31 H31H45 H31 H30 H37 H41 H44 H46 H34
ASCII Code
ASCII Code
Binary code
Sum
(Example 2)
Drive unit Computer
STX
Data read
Station
number
0
117 0 30
H02 H30 H31 H37H31 H37 H30 H03 H33 H30
Binary code
Sum
Sum
check
code
ETX
7
∗ When the Pr.123 PU communication waiting time "9999", create the communication request
data without "waiting time" in the data format. (The number of characters decreases by 1.)
H30+H31+H31+H37+H37+H30
= H130
H30+H31+H45+H31+H31+H30+H37+H41+H44
=H1F4