Danfoss VLT HVAC Design Manual page 145

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VLT HVAC Drive Design Guide
7.10.2 Force/Write Single Coil (05 HEX)
Description
This function forces a writes 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, 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)
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
-
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7 RS-485 Installation and Set-up
7
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