Force/Write Multiple Coils (0F Hex); Read Holding Registers (03 Hex); Mg18C502 - Rev. 2013-09-06; Preset Single Register (06 Hex) - Danfoss FC 101 Design Manual

RS-485 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 followers.
Query
The query message specifies the coils 17 to 32 (speed set-
point) to be forced.
Field Name Example (HEX)
Follower Address 01 (frequency converter address)
Function 0F (write multiple coils)
Coil Address HI 00
Coil Address LO 10 (coil address 17)
Quantity of Coils HI 00
Quantity of Coils LO 10 (16 coils)
Byte Count 02
Force Data HI 20
(Coils 8-1)
Force Data LO 00 (ref.=2000 hex)
(Coils 16-9)
Error Check (CRC) -
Table 7.25 Query
Response
The normal response returns the follower address, function
code, starting address, and quantity of coils forced.
Field Name Example (HEX)
Follower Address 01 (frequency converter address)
Function 0F (write multiple coils)
Coil Address HI 00
Coil Address LO 10 (coil address 17)
Quantity of Coils HI 00
Quantity of Coils LO 10 (16 coils)
Error Check (CRC) -
Table 7.26 Response

7.10.4 Read Holding Registers (03 HEX)

Description
This function reads the contents of holding registers in the
follower.
Query
The query message specifies the starting register and
quantity of registers to be read. Register addresses start at
zero, that is, registers 1-4 are addressed as 0-3.
Example: Read 3-03 Maximum Reference, register 03030.
®
VLT HVAC Basic Drive FC 101 Design Guide
Field Name
Follower Address
Function
Starting Address HI
Starting Address LO
No. of Points HI
No. of Points LO
Error Check (CRC)
Table 7.27 Query
Response
The register data in the response message are packed as 2
bytes per register, with the binary contents right justified
within each byte. For each register, the first byte contains
the high-order bits and the second contains the low-order
bits.
Example: Hex 000088B8=35.000=15 Hz.
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)
Table 7.28 Response

7.10.5 Preset Single Register (06 HEX)

Description
This function presets a value into a single holding register.
Query
The query message specifies the register reference to be
preset. Register addresses start at zero, that is, register 1 is
addressed as 0.
Example: Write to 1-00 Configuration Mode, register 1000.
Field Name
Follower Address
Function
Register Address HI
Register Address LO
Preset Data HI
Preset Data LO
Error Check (CRC)
Table 7.29 Query

MG18C502 - Rev. 2013-09-06

Example (HEX)
01
03 (read holding registers)
0B (Register address 3029)
05 (Register address 3029)
00
02 - (3-03 Maximum Reference is 32 bits
long, i.e. 2 registers)
-
Example (HEX)
01
03
04
00
16
E3
60
-
Example (HEX)
01
06
03 (Register address 999)
E7 (Register address 999)
00
01
-
7 7
93