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 (pa-
rameter write control) to be forced. Coil ad-
dresses start at zero, i.e. coil 65 is addressed
as 64. Force Data = 00 00HEX (OFF) or FF
00HEX (ON).
Field Name
Example (HEX)
Slave Address
01 (frequency con-
verter address)
Function
05 (write single coil)
Coil Address HI
00
Coil Address LO
40 (coil no. 65)
Force Data HI
FF
Force Data LO
00 (FF 00 = ON)
Error Check (CRC)
-
Response
The normal response is an echo of the query,
returned after the coil state has been forced.
Field Name
Example (HEX)
Slave Address
01
Function
05
Force Data HI
FF
Force Data LO
00
Quantity of Coils HI 00
Quantity of Coils LO 01
Error Check (CRC)
-
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7. RS-485 Installation and Set-up
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