Danfoss VLT AQUA Drive Design Manual page 143

VLT ® AQUA Drive Design Guide
Response
The coil status in the response message is packed as one coil per bit of the data field. Status is
indicated as: 1 = ON; 0 = OFF. The LSB of the first data byte contains the coil addressed in the
query. The other coils follow toward the high order end of this byte, and from 'low order to high
order' in subsequent bytes.
If the returned coil quantity is not a multiple of eight, the remaining bits in the final data byte will
be padded with zeros (toward the high order end of the byte). The Byte Count field specifies the
number of complete bytes of data.
Field Name
Slave Address
Function
Byte Count
Data (Coils 40-33)
Data (Coils 48-41)
Error Check (CRC)
7.10.2. Force/Write Single Coil (05 HEX)
Description
This function forces a coil to either ON or OFF. When broadcast, the function forces the same coil
references in all attached slaves.
Query
The query message specifies the coil 65 (parameter write control) to be forced. Coil addresses
start at zero, i.e., 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)
Response
The normal response is an echo of the query, which is 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)
MG.20.N2.22 - VLT ® is a registered Danfoss trademark.
7. RS-485 Installation and Set-up
Example (HEX)
01 (adjustable frequency drive address)
01 (read coils)
02 (2 bytes of data)
07
06 (STW=0607hex)
-
Example (HEX)
01 (adjustable frequency drive address)
05 (write single coil)
00
40 (coil no. 65)
FF
00 (FF 00 = ON)
-
Example (HEX)
01
05
FF
00
00
01
-
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