Force/Write Multiple Coils (0F Hex); Read Holding Registers (03 Hex); Preset Single Register (06 Hex) - Danfoss VLT HVAC Basic Drive FC 101 Design Manual

RS485 Installation and Set-...

7.10.3 Force/Write Multiple Coils (0F hex)

Description
This function forces each coil in a sequence of coils to
either on or off. When broadcasting, the function forces
the same coil references in all attached slaves.
Query
The query telegram specifies the coils 17–32 (speed
setpoint) to be forced.
NOTICE
Coil addresses start at 0, that is, coil 17 is addressed as
16.
Field name
Slave address
Function
7 7
Coil address HI
Coil address LO
Quantity of coils HI
Quantity of coils LO
Byte count
Force data HI
(Coils 8–1)
Force data LO
(Coils 16–9)
Error check (CRC)
Table 7.26 Query
Response
The normal response returns the slave address, function
code, starting address, and quantity of coils forced.
Field name
Slave address
Function
Coil address HI
Coil address LO
Quantity of coils HI
Quantity of coils LO
Error check (CRC)
Table 7.27 Response

7.10.4 Read Holding Registers (03 hex)

Description
This function reads the contents of holding registers in the
slave.
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.
94
®
VLT HVAC Basic Drive FC 101
Example (hex)
01 (frequency converter address)
0F (write multiple coils)
00
10 (coil address 17)
00
10 (16 coils)
02
20
00 (reference = 2000 hex)
–
Example (hex)
01 (frequency converter address)
0F (write multiple coils)
00
10 (coil address 17)
00
10 (16 coils)
–
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Field name
Slave address 01
Function 03 (Read holding registers)
Starting address HI 0B (Register address 3029)
Starting address LO D5 (Register address 3029)
Number of points HI 00
02 – (parameter 3-03 Maximum
Number of points LO Reference is 32 bits long, that is, 2
registers)
Error check (CRC) –
Table 7.28 Query
Response
The register data in the response telegram is packed as 2
bytes per register, with the binary contents right justified
within each byte. For each register, the 1
the high-order bits, and the 2
bits.
Example: hex 000088B8 = 35.000 = 35 Hz.
Field name
Slave address
Function
Byte count
Data HI (register 3030)
Data LO (register 3030)
Data HI (register 3031)
Data LO (register 3031)
Error check (CRC)
Table 7.29 Response

7.10.5 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.
Field name
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 7.30 Query
Example (hex)
st byte contains
nd
contains the low-order
Example (hex)
01
03
04
00
16
E3
60
–
Example (hex)
MG18C702