Danfoss VLT 2800 Series Operating Instructions Manual page 34

All values are in hexadecimal.
å EXAMPLE 4: Write Parameter 104
Motor Frequency, with 60 Hz
(Data Type 6: UINT16)
(Conversion factor = 0)
Modbus Function 06
Message sent to Modbus RTU from Modbus master
Byte 0 Byte 1
Slave Function
Address
01
Modbus message string:
[01] [06]
[04]+[0F]:
[01] [06]
[00+[3C]:
Message returned to Modbus master from Modbus RTU
Byte 0 Byte 1
Slave Function
Address
01
All values are in hexadecimal.
å EXAMPLE 5: Read Parameter 514
Motor Current = 3 Amps
(Data Type 7: UINT32)
(Conversion factor = -2)
Modbus Function 03
34
VLT® Serie 2800 and VLT® Serie 6000 Modbus RTU
Preset Single Register
HEX
Byte 2
Register Addr
HI
06 04
[04] [0F]
Parameter 104 = 040F
Note that the starting address of a register is the parameter number x 10 - 1
in HEX.
104 x 10 = 1040 - 1 = 1039 = 040F
[04] [0F]
Speed (60 Hz) = 3C
Byte 2
Register Addr
HI
06 04
Read Holding Registers
HEX
Byte 3 Byte 4
Register Addr Preset Data HI
LO
0F 00
[00] [3C] [error check]
HEX
HEX
[00] [3C] [error check]
HEX
Byte 3 Byte 4
Register Addr Preset Data HI
LO
0F 00
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Byte 5 Byte 6+7
Preset Data LO Error Check
3C --
Byte 5 Byte 6 + 7
Preset Data LO Error Check
3C --