Danfoss VLT FC 360 Design Manual

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Contents

Danfoss VLT FC 360 Design Manual Manual pdf 45 page image

A stop bit completes a character, thus consisting of 11 bitsin all.0 1 32 4 5 6 7195NA036.10StartbitEven StopParity bitIllustration 3.2 Content of a Character3.4.2 Telegram StructureEach telegram has the following structure:1. Start character (STX)=02 Hex2. A byte denoting the telegram length (LGE)3. A byte denoting the frequency converter address(ADR)A number of data bytes (variable, depending on the typeof telegram) follows.A data control byte (BCC) completes the telegram.STX LGE ADR DATA BCC195NA099.10Illustration 3.3 Telegram Structure3.4.3 Telegram Length (LGE)The telegram length is the number of data bytes plus theaddress byte ADR and the data control byte BCC.4 data bytes LGE=4+1+1=6 bytes12 data bytes LGE=12+1+1=14 bytesTelegramscontaining texts 101)+n bytesTable 3.4 Length of Telegrams1) The 10 represents the fixed characters, while the “n’” is variable(depending on the length of the text).3.4.4 Frequency Converter Address (ADR)Address format 1-126Bit 7=1 (address format 1-126 active)Bit 0-6=frequency converter address 1-126Bit 0-6=0 BroadcastThe slave returns the address byte unchanged to themaster in the response telegram.3.4.5 Data Control Byte (BCC)The checksum is calculated as an XOR-function. Before thefirst byte in the telegram is received, the calculatedchecksum is 0.RS-485 Installation and Set... VLT® AutomationDrive FC 360 Design GuideMG06B202 - VLT® is a registered Danfoss trademark 433 3