Salicru CV50-008-4F, User Manual, Page: 114 / 144

114 - 144 Communication Protocol
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)
9.4.2 ASCII mode
9.4.2.1 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 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
9.4.2.2 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)
START ‘:’ START ‘:’
ADDR
‘0’
ADDR
‘0’
‘2’ ‘2’
CMD
‘0’
CMD
‘0’
‘6’ ‘6’