Operating instructions

VLT
®
2800, VLT
®
6000 HVAC and VLT
®
8000 AQUA Modbus RTU
Field Name Example (HEX)
Slave Address 01
Function 06
Register Address HI 00
Register Address LO 01
Preset Data HI 00
Preset Data LO 03
Error Check (CRC) -
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 00
Register Address LO 01
Preset Data HI 00
Preset Data LO 03
Error Check (CRC) -
■ Preset Multiple Registers (10
HEX
)
Description
Presets values into a sequence of holding registers (4x
references). When broadcast, the function presets the
same register references in all attached slaves.
Query
The query message specifies the register references
to be preset. Registers are addressed starting at
zero. Register 1 is addressed as 0.
Exampleofarequesttopresettworegisters(set
parameter 105 = 738 (7,38 A))
Field Name Example (HEX)
Slave Address 01
Function 10
Starting Address HI 04
Starting Address LO 19
No. of Registers HI 00
No 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) -
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
No. of Registers HI 00
No of Registers LO 02
Error Check (CRC) -
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