gefran VDI100 Series Instruction Manual page 299

Read Holding Register [03H]
Read consecutive holding registers. The address of the first holding register is specified in the protocol
Example: Read frequency command from the inverter with node address 1.
ASCII Mode
Command Message
3AH
30H
31H
30H
33H
30H
31H
Starting Register
32H
33H
30H
30H
30H
31H
?
?
0DH
0AH
RTU Mode
Command Message
Node Address
Function
Starting
Register
Number of
Registers
CRC-16
Loop back test [08H]
Check the communication between the master and the follower (inverter). The data used can be arbitrary.
ASCII Mode
Command Message
3AH
30H
31H
30H
38H
30H
30H
30H
30H
41H
35H
33H
37H
31H
42H
0DH
0AH
VDI100 • Instruction manual
STX
Node Address
Function
Number of
Registers
LRC CHECK
END
01 H
03H
High 0CH
Low 10H
Initial Save
High 00H
Low 01H
High 86H
Low 9FH
STX
Node Address
Function
Test Code
DATA
LRC CHECK
END
Response Message (Normal)
3AH STX
30H
Node Address
31H
30H
Function
33H
30H
Data Length
32H
31H
37H
Initial Save Register
37H
30H
?
LRC CHECK
?
0DH
END
0AH
Response Message (Normal)
Node Address 01H
Function 03H
Data Length 02H
High 17H
Register
Low 70H
High B6H
CRC-16
Low 50H
Response Message (Normal)
3AH
Node Address
30H
31H
Function
30H
38H
30H
Test Code
30H
30H
30H
41H
DATA
35H
33H
37H
LRC CHECK
31H
42H
0DH END
0AH
Response Message (Error)
3AH STX
30H
Node Address
31H
38H
Function
33H
30H
Exception code
34H
34H
LRC CHECK
30H
0DH
END
0AH
Response Message (Error)
Node Address 01H
Function 83H
Exception code 04H
High 40H
CRC-16
Low F3H
Response Message (Error)
3AH STX
30H
Node Address
31H
38H
Function
38H
30H
Exception code
33H
30H
LRC CHECK
36H
0DH
END
0AH
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