Danfoss VLT Midi Drive FC 280

Response
The register data in the response telegram is packed as 2
bytes per register, with the binary contents right justied
within each byte. For each register, the 1
st
byte contains
the high-order bits, and the 2
nd
contains the low-order
bits.
Example: hex 000088B8=35.000=35 Hz.
Field name Example (hex)
Slave address 01
Function 03
Byte count 04
Data HI (register 3030) 00
Data LO (register 3030) 16
Data HI (register 3031) E3
Data LO (register 3031) 60
Error check (CRC) –
Table 5.29 Response
5.10.5 Preset Single Register (06 hex)
Description
This function presets a value into a single holding register.
Query
The query telegram species the register reference to be
preset. Register addresses start at 0, that is, register 1 is
addressed as 0.
Example: Write to parameter 1-00 Conguration Mode,
register 1000.
Field name Example (hex)
Slave address 01
Function 06
Register address HI 03 (register address 999)
Register address LO E7 (register address 999)
Preset data HI 00
Preset data LO 01
Error check (CRC) –
Table 5.30 Query
Response
The normal response is an echo of the query, returned
after the register contents have been passed.
Field name Example (hex)
Slave address 01
Function 06
Register address HI 03
Register address LO E7
Preset data HI 00
Preset data LO 01
Error check (CRC) –
Table 5.31 Response
5.10.6 Preset Multiple Registers (10 hex)
Description
This function presets values into a sequence of holding
registers.
Query
The query telegram species the register references to be
preset. Register addresses start at 0, that is, register 1 is
addressed as 0. Example of a request to preset 2 registers
(set parameter 1-24 Motor Current to 738 (7.38 A)):
Field name Example (hex)
Slave address 01
Function 10
Starting address HI 04
Starting address LO 07
Number of registers HI 00
Number of registers LO 02
Byte count 04
Write data HI (Register 4: 1049) 00
Write data LO (Register 4: 1049) 00
Write data HI (Register 4: 1050) 02
Write data LO (Register 4: 1050) E2
Error check (CRC) –
Table 5.32 Query
Response
The normal response returns the slave address, function
code, starting address, and quantity of registers preset.
Field name Example (hex)
Slave address 01
Function 10
Starting address HI 04
Starting address LO 19
Number of registers HI 00
Number of registers LO 02
Error check (CRC) –
Table 5.33 Response
RS485 Installation and Set-... Design Guide
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