7300CV MODBUS COMMUNICATION PROTOCOL
File No. :PC-CV-08
Version : 1.A
Page :
11/34
5.2.2 Counter 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
38H
Data Length
(Byte)
38H
43H
*Register Number
*send out the data from
28CH~28FH, total 16 Byte
30H
?
30H
?
CHECK SUM
30H
0DH
END
34H
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
08H Data
length
8CH
*Register Number
00H
*Send out the data from 28CH~28FH,
total 8 Byte
04H
Data Length
?
CRC High Byte
CRC High Byte
?
CRC Low Byte
CRC Low Byte