Salicru CV30, Руководство пользователя, Страница: 109 / 140

Communication protocol 109 - 140
Low bit of data 0004H 88H
High bit of data 0005H 00H
Low bit of data 0005H 32H
Low bit of CRC C5H
High bit of CRC 6EH
END T1-T2-T3-T4 (transmission time of 3.5 bytes)
The RTU response command is:
START T1-T2-T3-T4 (transmission time of 3.5 bytes)
ADDR 02H
CMD 10H
High bit of write data
00H
Low bit of write data
04H
High bit of data number
00H
Low bit of data number
02H
Low bit of CRC C5H
High bit of CRC 6EH
END T1-T2-T3-T4 (transmission time of 3.5 bytes)
7.3.2 ASCII mode
7.3.2.1 Command code: 03H (0000 0011), read N words (Word) (max. number for
continuous reading is 16 words)
For instance: As for the inverter whose slave address is 01H, the starting address of internal storage is 0004,
read two words continuously, the structure of this frame is listed as below:
ASCII master command message (the command
sent from the master to the inverter
ASCII slave response message (the message sent
from the inverter to the master)
START ‘:’ START ‘:’
ADDR
‘0’
ADDR
‘0’
‘1’ ‘1’
CMD
‘0’
CMD
‘0’
‘3’ ‘3’
High bit of starting address
‘0’
Byte number
‘0’
‘0’ ‘4’
Low bit of starting address
‘0’
High bit of data address
0004H
‘1’
‘4’ ‘3’
High bit of data number
‘0’
Low bit of data address
0004H
‘8’
‘0’ ‘8’
Low bit of data number ‘0’ High bit of data address ‘0’