Figure 4.3: Data Frame
 
·   The start of frame bit marks the beginning of the data frame, it consists of a single dominant bit.
 
·         The Arbitration Field consisting of 12 bits: The 11-bit Identifier, which reflects the contents and priority of the message, and the Remote Transmission Request bit. The Remote transmission request bit is used to distinguish a Data Frame (RTR = dominant) from a Remote Frame (RTR = recessive).
 
·         The next field is the Control Field, consisting of 6 bits. The first bit of this field is called the IDE bit (Identifier Extension) and is at dominant state to specify that the frame is a Standard data Frame not an