N 1 Redundancy


8-N-1 is a common shorthand notation for a serial port parameter setting or configuration in asynchronous mode, in which there are eight (8) data bits, no (N) parity bit, and one (1) stop bit.

8-N-1 is the most common configuration for PC serial communications today.

The abbreviation is usually given together with the line speed (often incorrectly referred to as baud rate) in bits per second, as in 9600/8-N-1. The speed includes bits for framing (stop bits, parity, etc.) and the effective data rate is lower than the bit transmission rate. For 8-N-1 encoding, only 80% of the bits are available for data (for every eight bits of data, ten bits are sent over the serial link — one start bit, the eight data bits, and the one stop bit).

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