7300CV MODBUS COMMUNICATION PROTOCOL
File No. :PC-CV-08
Version : 1.A
Page :
14/34
5.2.5 Control function block read
ASCII Mode
PC
Æ
INV(PLC) INV(PLC)
Æ
PC
3AH STX
3AH STX
30H
30H
31H
Address
31H
Address
30H
30H
33H
Function Code
33H
Function Code
30H
30H
32H
43H
Data Length
(Byte)
43H
43H
*Register Number
*Send out the data from
2CCH~2D1H, total 24 Byte
30H
?
30H
?
CHECK SUM
30H
0DH
END
36H
Data Length
0AH
END
?
?
CHECK SUM
0DH END
0AH END
RTU Mode
PC
Æ
INV(PLC) INV(PLC)
Æ
PC
01H Address
01H Address
03H Function
Code
03H Function
Code
02H
0CH Data
length
CCH
*Register Number
00H
**Send out the data from
2CCH~2D1H, total 12 Byte
06H
Data Length
?
CRC High Byte
CRC High Byte
?
CRC Low Byte
CRC Low Byte