Astraada AS24DRV4075, Operation Manual

Page: 103 / 129

Astraada DRV-24 frequency inverters Communication protocol
101
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
7.3.2.1Command 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 0005H
‘0’
‘2’ ‘0’
LRC CHK Hi ‘F’
Low bit of data
address 0005H
‘0’
LRC CHK Lo ‘6’ ‘0’
END Hi CR LRC CHK Hi ‘5’
END Lo LF LRC CHK Lo ‘D’
END Hi CR
END Lo LF
7.3.2.2 Command code: 06H (0000 0110), write one word (Word)
For instance: Write 5000 (1388H) to the 0004H address of the inverter whose slave address is 02H,
then the structure of this frame is listed as below:
ASCII master command message (the
command sent by the master to the
inverter)
ASCII slave response message (the
message sent by the inverter to the
master)