gefran BDI50 Series

App 3-8
4.3 Read the data in the holding register [03H]
Master unit reads the contents of the holding register with the continuous number for the
specified quantity.
Note:1. Limit number of read data，RTU: 37，ASCII:17.
2. Can only Continuous read the address of the same Group
3. Read data Quantity≥1.
(Example) Read the SLAVE station No: 01 ,BDI50 drive’s frequency command.
ASCII Mode
Instruction Message Response Message (Normal) Response (Fault)
3AH
STX
3AH
STX
3AH
STX
30H
SLAVE
Address
30H
SLAVE
Address
30H
SLAVE
Address
31H
31H
31H
30H
Function Code
30H
Function Code
38H
Function Code
33H
33H
33H
32H
Start
Address
30H
DATA Number
35H
Error Code
35H
32H
32H
32H
31H
First
holding
register
?
LRC CHECK
33H
37H
?
32H
Quantity
37H
0DH
END
35H
30H
0AH
30H
?
LRC CHECK
31H
?
?
LRC CHECK
0DH
END
?
0AH
0DH
END
0AH
RTU Mode
Instruction Message Response Message (Normal) Response(Fault)
SLAVE Address
01H
SLAVE Address
01H
SLAVE Address
01H
Function Code
03H
Function Code
03H
Function Code
83H
Start
Address
High
25H
DATA Number
02H
Error Code
52H
Low
23H
First
holding
register
High
07H
CRC-16
High
C0H
Quantity
High
00H
Low
D0H
Low
CDH
Low
01H
CRC-16
High
BBH
CRC-16
High
7EH
Low
E8H
Low
CCH