INVT GD200A-004G-4, Руководство по эксплуатации

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GD200A series VFD Communication protocol
-135-
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)
9.4.2 ASCII mode
9.4.2.1 Command code: 03H (0000 0011), read N words (Word) (N
≤
16 words)
For instance: As for the VFD 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 master to the VFD
ASCII slave response message (the
message sent from VFD 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’