Modbus Ascii-Message Examples; Function Code 3, Read 16-Bit Parameter - BONFIGLIOLI Vectron ACTIVE Manual

8.2

8.2.1 Function Code 3, Read 16-bit Parameter

Example 1:
Reading of parameter
inverter with address 1
Request: Master
Field
ASC
Hex
Response: Frequency Inverter
Field:
ASC
Hex
The hexadecimal value sent is 0x056E = 1390.
Parameter
Therefore, the rated speed is 1390 min
Example 2:
Reading parameter
verter with address 1 and No. of Regs field set to 2 (invalid value)
Field:
ASC
Hex
Error Response: Frequency Inverter
Field:
ASC
Hex
The sent exception code is hexadecimal value 0x02 = ILLEGAL DATA ADDRESS.
05/08
05/08

Modbus ASCII-Message Examples

Rated Speed
Frequency Inverter
SoF Adr Fct.Code
: 0 1 0 3
3A 30 31 30 33 32
SoF Adr Fct.Code no.Bytes
: 0 1 0 3
3A 30 31 30 33
Rated Speed
372 has no decimal places.
Rated Speed
SoF Adr Fct.Code
: 0 1 0 3
3A 30 31 30 33 30
SoF Adr Fct.Code
: 0 1 8 3
3A 30 31 38 33
Modbus Instruction manual
Modbus Instruction manual
372 (0x0174) in data set 2 from the frequency
DSet/Par-No. No. of Regs
2 1 7 4 0
31 37 34 30 30
Master
Par-Value
0 2 0 5 6
30 32 30 35 36
-1
.
372 (0x0174) in data set 0 from the frequency in-
DSet/Par-No. No. of Regs
0 1 7 4 0
31 37 34 30 30
Master
Excep.
LRC EoF
Code
0 2 7 A CR
30 32 37 41 0D
LRC
0 0 1 6 6 CR
30 31 36 36 0D
LRC EoF
E 8 7 CR LF
45 38 37 0D 0A
LRC
0 0 2 8 5 CR
30 32 38 35 0D
LF
0A
EoF
LF
0A
EoF
LF
0A
43
43