Danfoss VLT HVAC Drive FC 100 Series Design Manual

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Danfoss VLT HVAC Drive FC 100 Series Design Manual Manual pdf 140 page image

7.3 Network Configuration7.3.1 Adjustable Frequency Drive Set-upSet the following parameters to enable the FC protocol forthe Adjustable frequency drive.Parameter Number Setting8-30 Protocol FC8-31 Address 1–1268-32 Baud Rate 2400–1152008-33 Parity / StopBitsEven parity, 1 stop bit (default)Table 7.37.4 FC Protocol Message Framing Structure7.4.1 Content of a Character (byte)Each character transferred begins with a start bit. Then 8data bits are transferred, corresponding to a byte. Eachcharacter is secured via a parity bit. This bit is set at "1"when it reaches parity. Parity is when there is an equalnumber of 1s in the 8 data bits and the parity bit in total.A stop bit completes a character, thus consisting of 11 bitsin all.Figure 7.57.4.2 Message StructureEach message has the following structure:1. Start character (STX)=02 Hex2. A byte denoting the message length (LGE)3. A byte denoting the Adjustable frequency driveaddress (ADR)A number of data bytes (variable, depending on the typeof message) follows.A data control byte (BCC) completes the message.STX LGE ADR DATA BCC195NA099.10Figure 7.6RS-485 Installation and Set... VLT® HVAC Drive Design Guide7-4 MG11BB22 - VLT® is a registered Danfoss trademark77