TECO 7300CV - Read Holding Register [03 H]

7300CV MODBUS COMMUNICATION PROTOCOL
File No. :PC-CV-08
Version : 1.A
Page :
26/34
6.5.3 Read the data in the holding register [03H]
Master unit reads the contents of the holding registers with the continuous numbers for the specified
quantity.
(Example) Read the SLAVE station No: 01, 7300CV drive's frequency command.
ASCII Mode
Instruction Message Response Message (Normal) Response Message (Fault)
3AH
STX
3AH
STX
3AH
STX
30H 30H 30H
31H
SLAVE
Address
31H
SLAVE
Address
32H
SLAVE
Address
30H 30H 38H
33H
Function
Code
33H
Function
Code
33H
Function
Code
30H 30H 35H
31H 32H
DATA
number
32H
Error Code
32H 31H 0DH
33H
Start Address
37H 0AH
END
30H 37H
30H 30H
First holding
register
30H ?
31H
Quantity
?
LRC CHECK
? 0DH
?
LRC CHECK
0AH
END
0DH
0AH
END
RTU Mode
Instruction Message Response Message (Normal) Response Message (Fault)
SLAVE Address
01 H SLAVE Address 01H SLAVE Address 02H
Function Code
03H Function Code 03H Function Code 83H
High
01H DATA number 02H Error Code 52H
Start Address
Low
23H
High
17H
High
C0H
High
00H
First holding
register
Low
70H
CRC-16
Low
CDH
Quantity
Low
01H
High
AFH
High
74H
CRC-16
Low
82H
CRC-16
Low
3CH