Danfoss VLT Flow Drive FC 111 Design Manual page 122

VLT® Flow Drive FC 111
Design Guide
Field name
Error check (CRC)
8.10.5 Read Holding Registers (03 hex)
Description
This function reads the contents of holding registers in the follower.
Query
The query telegram specifies the starting register and quantity of registers to be read. Register addresses start at 0, that is, registers
1–4 are addressed as 0–3.
Example: Read parameter 3-03 Maximum Reference, register 03030.
Table 76: Query
Field name
Follower address
Function
Starting address HI
Starting address LO
Number of points HI
Number of points LO
Error check (CRC)
Response
The register data in the response telegram is packed as 2 bytes per register, with the binary contents right justified within each byte.
st
For each register, the 1 byte contains the high-order bits, and the 2
Example: hex 000088B8 = 35.000 = 35 Hz.
Table 77: Response
Field name
Follower address
Function
Byte count
Data HI (register 3030)
Data LO (register 3030)
Data HI (register 3031)
Data LO (register 3031)
Error check (CRC)
8.10.6 Preset Single Register (06 hex)
Description
This function presets a value into a single holding register.
Query
The query telegram specifies 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 Configuration Mode, register 1000.
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Example (hex)
01
03 (Read holding registers)
0B (Register address 3029)
D5 (Register address 3029)
00
02 – (parameter 3-03 Maximum Reference is 32 bits long, that is, 2 registers)
–
Example (hex)
–
nd
contains the low-order bits.
Example (hex)
01
03
04
00
16
E3
60
–
RS485 Installation and Set-up
AJ363928382091en-000101 / 130R0983