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RS-485 Installation and Set...
3.10.2 Force/Write Single Coil (05 HEX)
Description
This function forces the coil to either ON or OFF. When
broadcast the function forces the same coil references in
3
3
all attached slaves.
Query
The query message specifies the coil 65 (parameter write
control) to be forced. Coil addresses start at zero, that is,
coil 65 is addressed as 64. Force Data=00 00HEX (OFF) or
FF 00HEX (ON).
Field Name
Slave Address
Function
Coil Address HI
Coil Address LO
Force Data HI
Force Data LO
Error Check (CRC)
Table 3.23 Query
Response
The normal response is an echo of the query, returned
after the coil state has been forced.
Field Name
Slave Address
Function
Force Data HI
Force Data LO
Quantity of Coils HI
Quantity of Coils LO
Error Check (CRC)
Table 3.24 Response
3.10.3 Force/Write Multiple Coils (0F HEX)
This function forces each coil in a sequence of coils to
either ON or OFF. When broadcast the function forces the
same coil references in all attached slaves.
The query message specifies the coils 17 to 32 (speed set-
point) to be forced.
54
®
VLT
AutomationDrive FC 360 Design Guide
Example (HEX)
01 (Frequency converter address)
05 (write single coil)
00
40 (64 decimal) Coil 65
FF
00 (FF 00=ON)
-
Example (HEX)
01
05
FF
00
00
01
-
®
MG06B202 - VLT
Field Name
Slave Address
Function
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 3.25 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 3.26 Response
3.10.4 Read Holding Registers (03 HEX)
Description
This function reads the contents of holding registers in the
slave.
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.
Field Name
Slave Address
Function
Starting Address HI
Starting Address LO
No. of Points HI
No. of Points LO
Error Check (CRC)
Table 3.27 Query
is a registered Danfoss trademark
Example (HEX)
01 (frequency converter address)
0F (write multiple coils)
00
10 (coil address 17)
00
10 (16 coils)
02
20
00 (ref.=2000 hex)
-
Example (HEX)
01 (frequency converter address)
0F (write multiple coils)
00
10 (coil address 17)
00
10 (16 coils)
-
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)
-
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