Modbus Ascii-Message Examples; Bit Access - BONFIGLIOLI Vectron Agile Communications Manual

9.2

Modbus ASCII-Message Examples

9.2.1

16 Bit access

9.2.1.1 Function Code 3, Read 16-Bit Parameter
Example 1:
Reading parameter
1.
Request: Master  Frequency Inverter
Field: SoF Addr.
ASC : 0
Hex 3A 30 31 30
Response: Frequency Inverter  Master
Field: SoF Addr.
ASC : 0
Hex 3A 30 31 30
The hexadecimal value sent is 0x056E = 1390. Parameter
Therefore, the rated speed is 1390 min
Example 2:
Reading parameter
1 and No. of Regs field set to 2 (invalid value).
Field: SoF Addr.
ASC : 0
Hex 3A 30 31 30
Error Response: Frequency Inverter  Master
Field: SoF Addr.
ASC : 0
Hex 3A 30 31 38
The sent exception code is hexadecimal value 0x04 = SLAVE DEVICE FAILURE.
02/2011
Rated Speed
372 (0x0174) in data set 2 from the frequency inverter with address
Fct.Code DSet/Par-No.
1 0 3 2 1
33 32 31 37 34 30 30 30 31 36 36 0D 0A
No. of
Fct.Code
Bytes
1 0 3 0 2
33 30 32
-1
.
Rated Speed
372 (0x0174) in data set 0 from the frequency inverter with address
Fct.Code DSet/Par-No.
1 0 3 0 1
33 30 31 37
Except.
Fct.Code
Code
1 8 3 0 4
33 30 34
No. of Regs
7 4 0 0 0
Par-Wert LRC
0 5 6 E 8
30 35 36 45 38
Rated Speed
No. of Regs
7 4 0 0 0 2
34 30 30 30 32 38
LRC EoF
7 8 CR LF
37 38 0D 0A
Modbus Agile
LRC EoF
1 6 6 CR LF
EoF
7 CR LF
37 0D 0A
372 has no decimal places.
LRC EoF
8 5 CR LF
35 0D 0A
53