Parity plus serial

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The remaining bits are called framing bits because they frame the data bits. Bytes Versus Values The collection of bits that comprise the serial data format is called a byte. At first, this term might seem inaccurate because a byte is 8 bits and the serial data format can range between 7 bits and 12 bits.

However, when serial data is stored on your computer, the framing bits are stripped away, and only the data bits are retained. Moreover, eight data bits are always used regardless of the number of data bits specified for transmission, with the unused bits assigned a value of 0. When reading or writing data, you might need to specify a value , which can consist of one or more bytes. For example, if you read one value from a device using the int32 format, then that value consists of four bytes.

For more information about reading and writing values, refer to Writing and Reading Data. Synchronous and Asynchronous Communication The RS standard supports two types of communication protocols: synchronous and asynchronous. Using the synchronous protocol, all transmitted bits are synchronized to a common clock signal.

The two devices initially synchronize themselves to each other, and then continually send characters to stay synchronized. Even when actual data is not really being sent, a constant flow of bits allows each device to know where the other is at any given time. That is, each bit that is sent is either actual data or an idle character. Synchronous communications allows faster data transfer rates than asynchronous methods, because additional bits to mark the beginning and end of each data byte are not required.