64
RTU Mode
START
Inaction period of exceeding 10ms.
ADR
Communication address: 8-bit address
CMD
Command code: 8-bit command
DATA(n-1)
Data:
N ×8-bit data, N
≤25
……
DATA 0
CRC CHK Low Cyclical Redundancy Check
16-bit CRC consists of two 8-bit characters
CRC CHK High
END
Inaction period of exceeding 10ms.
ADR (Communication address)
Allowable communication address shall range from 0 to 247. Communication address 0 indicates that
communication shall be sent to all AC motor drives. And in this case, AC motor shall not response any
signal to master device.
For example: Communication to AC motor drive of which the communication address is 16 (decimal)
ASC
Ⅱ
M ode:(A D R 1,A D R 0)=’
1’
,’
0’
=>’
1’
=31H ,’
0’
=30H
RTU Mode:(ADR)=10H
CMD (Command reference) and DATA
Format of data characters depends on command code. Available command code is explained below:
Command code: 03H, available to read N characters, Max (N) =12. for example: From address
01H to starting address 2102H of AC motor drive to read 2 characters continuously.
ASC
Ⅱ
M o d e
:
Command
STX
‘:’
ADR1
‘0’
ADR0
‘1’
CMD 1
‘0’
CMD0
‘3’
Starting data
address
‘2’
‘1’
‘0’
‘2’
Number of data
(Counting in
“word”)
‘0’
‘0’
‘0’
‘2’
LRC CHK 1
‘D’
LRC CHK 0
‘7’
END 1
CR
END 0
LF
Response
STX
‘:’
ADR1
ADR0
‘0’
‘1’
CMD 1
CMD0
‘0’
‘3’
Number of data (Counting in
“byte”)
Starting data address
2102H
‘0’
‘4’
‘1’
‘7’
‘7’
‘0’
Data address
2103H
‘0’
‘0’
‘0’
‘0’
LRC CHK 1
LRC CHK 0
‘7’
‘1’
END 1
END 0
CR
LF
